JP3987843B2 - Digital broadcast receiving apparatus and method - Google Patents

Description

  The present invention relates to a digital broadcasting system.

Recently, satellite digital broadcasting has been started, and a large number of programs are provided using multiple channels. Multi-channeling in satellite digital broadcasting is realized by multiplexing a plurality of channels in one band. For this multiplexing, a technique called transport stream in the MPEG2 (Moving Picture Experts Group 2) standard is used. Specifically, it is described in Non-Patent Document 1.
ISO / IEC standard 13818-1 (MPEG2 system) standard

By the way, in this satellite digital broadcasting, video information and the like are only transmitted unilaterally from the transmitting station, and there is no interactivity with the receiving side terminal. If the user of the receiving terminal can operate the video information interactively according to the content of the video information transmitted, a variety of services can be enjoyed.
For this reason, a system is also being realized in which the receiving side terminal and the transmitting station are connected via a telephone line or the like, but a separate line is required between each receiving side terminal and the transmitting station, and the cost required for the connection is also increased. appear.

  In view of the above problems, the present invention provides a digital broadcasting system as if video information is transmitted interactively in two directions using video information transmitted from a transmitting station in one direction. Objective.

  In order to achieve the above object, a digital broadcast receiving apparatus that receives a digital broadcast in which a plurality of image data and control information associated with each image data is repeatedly transmitted. Including link destination information indicating image data to be linked and other linked link image data, receiving means for receiving a digital broadcast, one image data from the received digital broadcast, and control information corresponding thereto Extraction means for extracting the control information, storage means for storing the extracted control information, reproduction means for reproducing the extracted image data, and a user selection operation for link destination information included in the control information. An extraction system that controls the extraction means to extract the operation means to be received and the control information corresponding to the image data specified by the link destination information in accordance with the user operation. It is provided with means.

With the above configuration, the user can selectively change image data transmitted in one direction from the digital broadcasting device from any one image data to other image data in accordance with the link destination information included in the control information. Digital broadcasting can be used.
The present invention is also a digital broadcast receiving apparatus that receives a digital broadcast in which a plurality of image data is repeatedly transmitted. Each digital broadcast is assigned an image data identifier, and is assigned a different first image stream identifier. A plurality of image data including a plurality of image data, a value equivalent to an image data identifier corresponding to each image data, and a second image stream identifier corresponding to the first image stream identifier assigned to the corresponding image data. The table is multiplexed and repeatedly transmitted as a multiplexed stream, receiving means for receiving the digital broadcast, extraction means for extracting one image data from the received digital broadcast, storage means, and extracted image A reproducing means for reproducing data; an operating means for accepting a user's selection operation; and the extraction based on a user operation. Extraction control means for setting an extraction condition in the means, the extraction means extracts an image correspondence table with an image correspondence table identifier that matches the set extraction condition from the multiplexed stream, and the storage means The extracted image correspondence table is stored, and the operation means accepts an operation for specifying switching from the image data reproduced by the reproduction means to the designated image data, and the extraction means is further set The image data matching the extraction condition is extracted, and the extraction control unit sets an image correspondence table identifier having a value equivalent to the image data identifier of the designated image data as the extraction condition, and stores the image correspondence table identifier in the stored image correspondence table. The second image stream identifier described is read out, and the extraction condition is set in the extraction means using the read second image stream identifier.

With such a configuration, image data can be reliably extracted with reference to the image correspondence table. Further, the first and second image data identification information can be reused, and when a small amount of identification information is used effectively and there is a large amount of image data, the image data and the image data can be used even if the same identification information is attached to the image data. Correspondence with the correspondence table can be ensured.
Further, the extraction means stops extracting the image data after extracting one image data.

With such a configuration, it is possible to prevent different image data from being extracted after desired image data is extracted.
The present invention also relates to a digital broadcast receiving method for receiving a digital broadcast in which a plurality of image data is repeatedly transmitted. Each digital broadcast is assigned an image data identifier and is assigned a different first image stream identifier. A plurality of image data including a plurality of image data, a value equivalent to an image data identifier corresponding to each image data, and a second image stream identifier corresponding to the first image stream identifier assigned to the corresponding image data. The table is multiplexed and repeatedly transmitted as a multiplexed stream, the reception step of receiving the digital broadcast, the extraction step of extracting one image data from the received digital broadcast, the step of storing, and the extraction A playback step of playing back image data, an operation step of accepting a user's selection operation, An extraction control step for setting an extraction condition in the extraction means based on the operation, and the extraction step extracts an image correspondence table attached with an image correspondence table identifier that matches the set extraction condition from the multiplexed stream. Extracting, storing the extracted image correspondence table, and the operation step accepting an operation of switching designation from the image data reproduced in the reproduction step to designated image data, and the extracting step Further extracts image data that matches the set extraction condition, and the extraction control step sets an image correspondence table identifier having a value equivalent to the image data identifier of the designated image data as the extraction condition, and is stored. The second image stream identifier described in the image correspondence table is read, and the read second image stream identifier is used to It has decided to set the extraction conditions on the outlet means.

  By such a method, image data can be reliably extracted with reference to the image correspondence table. Further, the first and second image data identification information can be reused, and when a small amount of identification information is used effectively and there is a large amount of image data, the image data and the image data can be used even if the same identification information is attached to the image data. Correspondence with the correspondence table can be ensured.

Prior to the description of the configuration of the digital broadcasting system according to the present invention, the principle will be described with reference to FIGS.
FIG. 1 is an example of content displayed on the display screen on the receiving side, and is a diagram relating to a weather forecast. Here, the national and local weather forecasts are indicated by a plurality of contents 151, 152,... 153,. Here, content refers to a unit of information that is interactively operated by the user. These contents 151, 152,... 153,... Are switched in display as indicated by arrows 154, 155, 156, and 157 by a user operation.

  Now, when the content 153 indicating the national weather forecast is displayed on the display screen, when the user selects and determines the button 160 “Tokyo”, the display screen displays the content 153 as indicated by an arrow 154. To display of the content 151 indicating the weather forecast for Tokyo. Next, when the user performs a determination operation on the “return” button 158, the display screen is switched from the content 151 to the display of the original content 153 as indicated by an arrow 155.

  Similarly, when the user selects and determines the button 161 indicating “Osaka” on the display screen of the content 153, the display screen is switched from the content 153 to the display of the content 152 as indicated by an arrow 156. Further, in this state, when the user determines and operates the “return” button 159, the display screen returns to the state of the content 153 as indicated by an arrow 157. For the display switching operation, the contents 151,... Have buttons 158, 159, 160, 161.

Since the display of content can be arbitrarily switched by the user's display switching operation as described above, each content is transmitted on the transmission side as described below.
FIG. 2 is a diagram schematically showing transmission data transmitted from the transmission side. The transmission data 165 includes data (information) indicating a plurality of contents, and the whole is repeatedly transmitted. The transmission data 165 includes a plurality of image data 166, 167,... 168,... And navigation information 169, 170,.

Each image data 166,... Is a main image of each content 151,... Displayed on the receiving-side display screen, and in this description, a weather forecast image is shown.
Each navigation information 169,... Is displayed as a bitmap (Bitmap) data 172, 173, 174 indicating, for example, buttons 158,. Script (Script) information 175, 176, 177 describing the behavior for the user's operation, and hyperlink information 178, 179 indicating the link destination content that can be displayed by the user's operation. 180.

  The content 151 shown in FIG. 1 is expressed by image data 166 and navigation information 169. Similarly, the content 152 is expressed by image data 167 and navigation information 170, and the content 153 is expressed by image data 168 and navigation information. In other words, the image data 166,... And the navigation information 169,.

FIG. 3 is a diagram schematically showing a state of transmission of transmission data 165 transmitted from the transmission side. On the transmission side, transmission data 165 is repeatedly transmitted. It is understood that the transmission data 165 is repeatedly transmitted in time.
However, in this figure, although both image data and navigation information are shown in a frame structure, actually, the image data and the corresponding navigation information are multiplexed and the transmission data 165 is converted into an MPEG2 transport stream. It should be noted that the specific transmission data is different from that shown in FIG.

  Although not shown, each of the transmitted image data 166, 167,..., 168,... Is identified to be distinguished from other image data 166, 167,. Information is attached. Similarly, each navigation information 169, 170,..., 171 is also provided with identification information for distinguishing from the other navigation information 169, 170,.

On the other hand, on the receiving side, this identification information in the transmission data 165 is monitored, image data including desired identification information and navigation information are acquired, and reproduced as content 151, for example, as shown in FIG. indicate.
The acquired navigation information 171 is stored in preparation for a predetermined operation by the user.

Based on the above principle, an embodiment of a digital broadcasting system according to the present invention will be described below with reference to the drawings.
(Embodiment 1)
1-1. Overview of Configuration FIG. 4 is a configuration diagram of Embodiment 1 of the digital broadcast system according to the present invention. This digital broadcasting system includes a data transmission device 101 and a plurality of data reception devices 121.

The data transmission apparatus 101 is configured to multiplex and repeatedly transmit data of a plurality of contents hyperlinked to each other in an MPEG2 transport stream, and includes a transmission data storage unit 102, a data multiplexing unit 103, A multiple information storage unit 104, a system information table generation unit 105, and a transmission unit 106.
The data reception device 121 is configured to interactively extract and play back content from the MPEG2 transport stream transmitted from the data transmission device 101 in accordance with a user operation. The reception unit 122, the TS decoder unit 123, and the AV decoder Unit 124, reception data storage unit 125, reception control unit 126, signal reception unit 127, reproduction unit 128, display unit 129, and audio output unit 130.

1-2. Data transmission apparatus 101
1-2-1. Configuration of Transmission Data Storage Unit 102 The transmission data storage unit 102 is composed of a storage medium such as a magnetic disk, and stores data and structure information of a plurality of contents constituting one interactive program. A presentation information storage unit 107, a navigation information storage unit 108, and a structure information storage unit 109. Here, the interactive program is referred to as an “event” or a “program” in a state where the interactive program is included in the MPEG2 transport stream as transmission data.

The transmission data storage unit 102 stores the transmission data 165 shown in FIG. 2 separately for image data (presentation information) and navigation information as shown below. The correspondence relationship between the image data and the navigation information is stored as a structure information table.
1-2-1-1. Presentation information storage unit 107
The presentation information storage unit 107 stores presentation information such as image data and audio data included in each content. 5A and 5B show still image data which is an example of presentation information of the contents 153 and 151, respectively. FIG. 5A shows still image data 201 indicated by a file name “still5.m2v”, and FIG. 5B shows still image data 202 indicated by a file name “still1.m2v”. The still image data 201 and 202 are stored in a digitally encoded format based on the ISO / IEC13818-2 (MPEG2 video) standard. The encoding format of the image data may be other formats.

1-2-1-2. Navigation information storage unit 108
The navigation information storage unit 108 stores navigation information included in each content. The navigation information includes hyperlink information indicating a link to another content, and describes an object for the user to interactively select the link destination. FIG. 6 shows an example of navigation information. Here, the navigation information 301 is an example of the navigation information of the content 153, and is stored with the file name “navi5.nif”.

The fact that the still image data 201 shown in FIG. 5A and the navigation information 301 shown in FIG. 6 constitute one content 153 is shown in a structure information table 501 shown in FIG.
The navigation information 301 includes an object definition table (Object Definition Table) 302, a handler definition table (Handler Definition Table) 303, a hyperlink table (Hyperlink Table) 304, and a bitmap table (Bitmap Table) 305 shown in a table format. It is out.

  The object definition table 302 shows information such as the type (type) and attributes of graphics objects such as buttons (Buttons) displayed on the display screen for each index number. In the “Index” column, an index number is described. In the “type” column, the type of the graphics object is described. In the “X” and “Y” columns, the X and Y coordinate values of the display reference position on the display screen are respectively described. In the “Handler” column, an index number of a handler that is executed when the user selects an object indicated by the index number in the data receiving apparatus 121 is described. In the “Standard Bitmap” column, the index number of the bitmap displayed when each object is in the standard state is described. On the other hand, in the “Focus Bitmap” column, the index number of the bitmap displayed when each object is selected is described. Here, the standard state refers to a state in which an object is only displayed, and the selection state refers to a state in which the displayed object can be selected.

  For example, in the row of the index number “0” in the object definition table 302, when the type is “button”, the coordinate values of the display position of the upper left corner are X = 400, Y = 300, and the data receiving device 121 selects , The handler with the index number “2” is executed, and an object using the bitmap with the index number “6” in the standard state and the index number “7” in the selected state is shown. The same applies to the row with the index number “1”.

The handler definition table 303 shows a script (Script) that describes the behavior of the data receiving apparatus 121 for a user operation for each index number.
For example, in the line of the index number “2” in the handler definition table 303, a script “goto_contents (index4)” is described. This script instructs switching to the content represented by the hyperlink with the index number “4”. Note that, for example, an instruction to play a sound may be described by a script.

The hyperlink table 304 shows hyperlinks to content with content (Contents) numbers designated for each index number.
For example, the index number “4” in the hyperlink table 304 indicates a hyperlink to the content with the content number “1”.
The bitmap table 305 is a bitmap data (Bitmap Data) representing graphics information displayed on the image data of the presentation information on the data reception device 121 for each index number indicated as data in the object definition table 302. Show.

For example, index number “6” indicates bitmap data of “standard bitmap” of “button” of index number “0” of object definition table 302.
FIG. 7 shows navigation information 401 represented by a file name “navi1.nif”. The navigation information 401 includes an object definition table 402, a handler definition table 403, and a bitmap table 404.

  In the row of the index number “0” of the object definition table 402, “−” is shown as the index number of the standard bitmap. This indicates that no normal state bitmap is defined for this object. In the object definition table 402, only one object is defined, and the object with the index number “0” is always displayed in the selected state, and therefore, the bitmap in the standard state is not necessary and is omitted.

  The handler definition table 403 shows a script that is executed when the handler with the index number “3” is activated. The script with the index number “3” is “goto_entry” indicating an instruction to switch to entry content. Here, the entry content refers to the content that should be reproduced first when the reproduction of the interactive program is started.

The bitmap table 404 shows bitmap data with an index number “7”.
1-2-1-3. Structure information storage unit 109
The structure information storage unit 109 stores a structure information table and entry information. The structure information table is information of a combination of presentation information and navigation information constituting each content. Entry information refers to information indicating entry content.

  As shown in FIG. 8, the structure information table 501 indicates information on the combination of presentation information and navigation information constituting each content stored in the transmission data storage unit 102 for each content number. The content number is a number that uniquely identifies one content among a plurality of contents stored in the transmission data storage unit 102. As shown in FIG. 8, in the first row of the structure information table 501, the content identified by the content number 0 is stored in the file name “still0.jpg” stored in the presentation information storage unit 107. Still image data identified by m2v, and navi0.n stored in the navigation information storage unit 108. It shows that it is comprised by the set with the navigation information identified by nif. The same applies to the other lines.

Further, the entry information 502 illustrated in FIG. 8 indicates that the content number of the entry content of the interactive program stored in the transmission data storage unit 102 is 5.
1-2-2. Multiple information storage unit 104
The multiplex information storage unit 104 stores resource allocation information such as identifiers and bands for multiplexing the transmission data stored in the transmission data storage unit 102 in the MPEG2 transport stream as a multiplex information table. FIG. 9 shows an example of the multiplex information table 601.

The bit rate (Bitrate) recorded in the first row of the multiplexing information table 601 indicates the transmission rate assigned when multiplexing the transmission data stored in the transmission data storage unit 102 into the MPEG2 transport stream. . In this example, 6 Mbps is assigned as the transmission rate.
The original_network_id, transport_stream_id, service_id, and event_id in the second to fifth rows of the multiplexing information table 601 are used when the interactive program stored in the transmission data storage unit 102 is multiplexed as an event in the MPEG2 transport stream. Each value of the identifiers original_network_id, transport_stream_id, service_id, and event_id assigned to the event is shown. In the multiplex information table 601, “0 × 0001” is all assigned as these values, but usually unique values assigned to the respective services are written.

  In a general satellite digital broadcasting system, one or more MPEG2 transport streams are transmitted from one satellite (network) using carrier waves of different bands. Each broadcast program is multiplexed in one of the MPEG2 transport streams with original_network_id, transport_stream_id, service_id, and event_id based on the ETS 300 468 standard (hereinafter referred to as “DVB-SI standard”). original_network_id is an identifier that uniquely identifies the network. transport_stream_id is an identifier for uniquely identifying one transport stream in one network. service_id is an identifier for uniquely identifying one service in one transport stream. The event_id is an identifier that uniquely identifies one event in one service. An event is a group of several components, and corresponds to one program in the conventional analog broadcasting.

  The component is a stream (program element) identified by one PID (packet identifier) in ISO / IEC 13818-1 (hereinafter referred to as “MPEG2 system standard”), and is a constituent element of a program such as a moving image or audio. Express one of A service is a group of sequences of events, and corresponds to one channel in conventional analog broadcasting.

  A program (event) broadcast through a digital broadcasting system based on the DVB-SI standard can be uniquely specified in all digital broadcasting systems by specifying a set of these original_network_id, transport_stream_id, service_id, and event_id. it can. Details of original_network_id, transport_stream_id, service_id, and event_id are described in the DVB-SI standard.

  The sixth to tenth rows of the multiplex information table 601 are PIDs assigned to the components constituting the event when the application stored in the transmission data storage unit 102 is multiplexed as an event in the MPEG2 transport stream. Represents a value. PMT_PID and PCR_PID represent PID values assigned to PMT (Program Map Table) and PCR (Program Clock Reference), which will be described later.

NE_component_pid (navigation information component packet identifier) indicates the value of the PID assigned to the component that multiplexes the navigation information stored in the navigation information storage unit 108 of the transmission data storage unit 102.
VE_information_component_pid (stream correspondence information component packet identifier) indicates the value of the PID assigned to the component that multiplexes the stream correspondence table generated by the stream correspondence information table generation unit 111 described later.

VE_component_pid (image data component identifier) indicates the value of the PID assigned to the component that multiplexes the image data stored in the presentation information storage unit 107.
In the present embodiment, only one PID is given as NE_component_pid, VE_information_component_pid, and VE_component_pid, but a plurality of them may be given. That is, “0 × 0082” is assigned to NE_component_pid, “0 × 0083” is assigned to VE_information_component_pid, and “0 × 0084” is assigned to VE_component_pid as the PID. However, “0 × 0086” may be given as VE_information_component_pid and “0 × 0087” may be given as VE_component_pid.

Although not present in the present embodiment, when transmission data includes audio data, AE_information_component_pid and AE_component_pid are assigned in the same manner as image data.
1-2-3. Configuration of Data Multiplexing Unit 103 The data multiplexing unit 103 includes a multiplexing control unit 110 including a CPU and a memory, a stream correspondence information table generation unit 111, an identification information addition unit 112, a navigation information table generation unit 113, And a multiplexing unit 114.

The data multiplexing unit 103 performs the following process to generate the transmission data 165 shown in FIG.
1-2-3-1. Multiplex control unit 110 (part 1)
When the multiplex control unit 110 is activated by the transmission unit 106, first, the structure information table 501 and the multiplex information table 601 stored in the structure information storage unit 109 and the multiplex information storage unit 104 are referred to, and the content number For each digital broadcast, an identifier for uniquely identifying each content is assigned, and a content identifier assignment table is created.

  FIG. 10 shows an example of the content identifier assignment table 701. “Orig_nw_id” 703 and “ts_id” 704 represent the identifier values of the network and transport stream to which the image data, audio data, and navigation information constituting the content are transmitted, respectively. “VE_svc_id” 705 and “VE_event_id” 706 each represent the identifier value of the service and event to which the image data belongs, and “VE_id” 709 represents the identifier value that uniquely identifies the image data in one event. . Similarly, “NE_svc_id” 707 and “NE_event_id” 708 represent identifier values of the service and event to which the navigation information belongs, and “NE_id” 710 represents an identifier value uniquely identifying the navigation information in one event. To express. The same applies to “AE_svc_id” 711, “AE_event_id” 712, and “AE_id” 713. Since the content is a set of image data, audio data, and navigation information, it can be uniquely identified by each set of identifiers.

  In the content identifier assignment table 701, “orig_nw_id” 703, “ts_id” 704, “VE_svc_id” 705, and “VE_event_id” 706 correspond to each content number 702, and are stored in the multiple information storage unit 104. The values of original_network_id, transport_stream_id, service_id, and event_id in Table 601 are written. Similarly, values of service_id and event_id are also written in “NE_svc_id” 707 and “NE_event_id” 708.

In this embodiment, “VE_id” 709 and “NE_id” 710 are assigned the same value as the content number 702. Note that “VE_id” 709 and “NE_id” \ u 710 do not need to match the \ u content number 702, and different values may be given for each image data and each navigation information.
In this embodiment, “AE_svc_id” 711, “AE_event_id” 712, and “AE_id” 713 are not given an identifier because there is no audio data in the content, and “−” is written, If it is included, it is assigned in the same manner as image data and navigation information.

  When the creation of the content identifier assignment table 701 is completed, the multiplexing control unit 110 creates a display image information identifier assignment table in which values of “PID”, “component_tag”, and “stream_id” are assigned for each image data. FIG. 11 is a diagram showing an example of the display image information identifier assignment table 801. In the display image information identifier assignment table 801, “VE_id” 709 is assigned the value assigned in the identifier assignment table 701. “PID” 803 is given the value (“0 × 0084” in this example) assigned by “VE_component_pid” in the multiplex information table 601. The “component_tag” (component tag) 802 is assigned the same value for one “PID” 803 (for example, the value “0 × 00” of “component_tag” for the value “0 × 0084” of “PID”). Is given). The “stream_id” 804 is cyclically assigned sequentially from “e0” to “ef” corresponding to “VE_id” 709 in hexadecimal notation. Further, the file name of the image data stored in the presentation information storage unit 107 identified by the “VE_id” 709 is written as the image data file 805.

  When a plurality of identifiers are given to VE_component_pid in FIG. 9, “PID” and “stream_id” can be assigned as follows, for example. In order of “VE_id”, first, one “VE_component_pid” is extracted from the multiple information table and given to “PID”, and “stream_id” is cyclically given values of “e0” to “ef” in hexadecimal notation. Each time stream_id makes a round, a new VE_component_pid is extracted from the multiplex information table and given to “PID”. When there is no new VE_component_pid, the process returns to the VE_component_pid that was given first. Different values are assigned to “component_tag” for each “PID”.

  Further, in this embodiment, all 16 of “e0” to “ef” are used in hexadecimal notation that can be used as the value of stream_id for video data, but only a part is used. Also good. In addition, when there is audio data, the MPEG2 standard defines that stream_id uses 32 pieces of “c0” to “df” in hexadecimal notation.

  The “component_tag” 802 is used to indirectly refer to the PID. The component_tag is a value freely assigned to the PID in a one-to-one correspondence, and the correspondence between the component_tag and the PID is given in the PMT described later. From within navigation information and stream correspondence information, the PID value is not referred to directly, but is indirectly referred to using component_tag. Even when the value is rewritten, the navigation information and the stream correspondence information need not be changed.

  When the creation of the display image information identifier assignment table 801 is completed, the multiplexing control unit 110 instructs the stream correspondence information table generation unit 111 to generate a stream correspondence table, and instructs the identifier information addition unit 112 to add VE_id to the private area of the image data. And instructing the navigation information table generating unit 113 to generate the navigation \ u information \ u table.

1-2-3-2. Identification information adding unit 112
When the identifier information adding unit 112 receives an instruction to add identifier information from the multiplexing control unit 110, the identifier information adding unit 112 reads the image data stored in the presentation information storage unit 107. The image data identifier VE_id is written in the private area in the read image data bit stream. Note that VE_id is acquired with reference to the display image information identifier assignment table 801 created by the multiplexing control unit 110. A file name is assigned to the image data bit stream in which VE_id has been written and stored in a storage area (not shown).

  FIG. 12 shows a bitstream 901 as an example of image data with the file name “VE (5)” to which identifier information is added. The bit stream 901 is encoded based on the MPEG2 standard, and the value VE_id “0 × 0005” is recorded in the user data area 903 of the picture header 902. In the picture data area 904, the still image data 201 shown in FIG. 5A is recorded. When identifier information is added to all the image data, the multiplexing control unit 110 is notified of the completion of addition.

In this embodiment, the user data area in the picture header is used as the area for writing VE_id. However, an area in which other private data can be written may be used.
1-2-3-3. Navigation information table generation unit 113
When the navigation information table generation unit 113 receives an instruction to generate a navigation information table from the multiplex control unit 110, the navigation information table generation unit 113 reads the navigation information stored in the navigation information storage unit 108. When the read navigation information includes a hyperlink table, the information of the link destination indicated by the content number is referred to the content identifier assignment table 701 and converted into the notation of each identifier to generate the navigation information table. When the hyperlink table is not included, the navigation information table is generated by changing only the file name without changing the original navigation information. The generated navigation information is stored in a storage area (not shown).

  FIG. 13 shows a navigation information table 1001 of the generated file name “NVT (5)”. This navigation information table 1001 is generated from the navigation information of the file name “navi5.nif” shown in FIG. The navigation information table 1001 includes an object definition table 1002, a handler definition table 1003, a hyperlink table 1004, and a bitmap table 1005.

  It should be noted that “−” is written in the column of “orig_nw_id” or the like in the hyperlink table 1004 and the identifier is not described because the identifier is the same between the link source and the link destination of the content. Indicates that it is omitted. By omitting recording, the storage area is reduced. If the link destination is another service, each identifier is also described in “VE_service_id”, “VE_event_id”, “NE_service_id”, and “NE_event_id”. Here, “0 × 0001” refers to the value of VE_id and NE_id of index number “4”, and “0 × 0002” refers to the value of VE_id and NE_id of index number “5”, respectively. Are described.

FIG. 14 shows a navigation information table 1101 with the file name “NVT (1)”. This navigation information table 1101 is generated from the navigation information of the file name “navi1.nif” shown in FIG. 7, and since there is no hyperlink table, the contents are not changed.
When the navigation information table generation unit 113 finishes generating the navigation information table, the navigation information table generation unit 113 notifies the multiplexing control unit 110 of the end of generation.

1-2-3-4. Stream correspondence information table generation unit 111
Upon receiving an instruction to generate a stream correspondence table from the multiplexing control unit 110, the stream correspondence information table generation unit 111 refers to the display image information identifier assignment table 801 and generates a stream correspondence table for each image data. This stream correspondence table is used for extracting one image data from the stream transmitted from the data transmission apparatus 101 to the data reception apparatus 121.

  FIG. 15A shows a stream correspondence table “VET (5)” 1201 used for extracting the image data “VE (5)” on the data receiving apparatus 121 side. “First_pts” in the stream correspondence table 1201 represents start reproduction time information that represents the time at which the first frame of the corresponding image data is reproduced in units of 1 / 90,000 seconds. It can be obtained using.

  Here, S_VE (x) is the size when the image data VE (x) stored in the storage area of the identifier information adding unit 112 is converted into a transport stream packet according to the MPEG2 system standard (the same applies hereinafter), S_NVT (X) is the size when the navigation information table NVT (x) stored in the storage area of the navigation information table generation unit 113 is converted into a transport stream packet, and S_VET is the storage area of the stream correspondence information generation unit 111 This is the size when one stream correspondence table VET stored in is converted into a transport stream packet. The unit of size is bits. R represents the number of times the stream correspondence table VET is repeatedly multiplexed, and takes an integer value from “1” to “(P × S)”. Here, P is the number of PIDs assigned for components that transmit image data assigned by the multiplex information storage unit 104, and is “1” in the present embodiment. S represents the number of stream_id used in the display image identifier assignment table 801, and is “16” in the present embodiment. B is a bit rate and is “6 Mbps” in the present embodiment.

  Note that S_VE (x) adds the size of the PES packet header and trailer information required for each PES packet unit to the size of VE (x), and further transport packet header and trailer required for each transport packet unit. Calculate by adding the size of information. S_NVT (x) adds the size required for each section unit to the section header and trailer information to the size of NVT (x), and further, the transport packet header and trailer information required for each transport packet unit. Calculate by adding the size of. Similar to S_NVT (x), S_VET is obtained by adding the size of the section header or the like to the size of VET. In this embodiment, all VET sizes are the same. Details of PES packets, transport packets, and sections are defined in the MPEG2 system standard.

“Last_pts” in the stream correspondence table 1201 represents end reproduction time information indicating the time at which the last frame of the corresponding image data is reproduced in units of 1 / 90,000 seconds. In the present embodiment, Since the image data is a still image, “last_pts” (end reproduction time information) and “first_pts” match.
The component_tag and stream_id of the stream correspondence table 1201 refer to the display image information identifier assignment table 801 and acquire the values of the component_tag and stream_id assigned to the corresponding image data.

FIG. 15B shows a first stream correspondence table 1202 of image data, and FIG. 15C shows a fifteenth stream correspondence table 1203 of image data.
It should be noted that at time “0”, which is the reference for “first_pts” and “last_pts” in the stream correspondence tables 1201, 1202, and 1203, the data stored in the transmission data storage unit 102 is first multiplexed in the transport stream. It is the time when it was sent.

In the present embodiment, the value of the assigned component_tag is described with reference to the display image information identifier assignment table 801 in the stream correspondence table. However, the value is assigned in the multiplex information table 601 instead of the value of the component_tag. The value of VE_component_pid may be directly described.
1-2-3-5. Multiplex control unit 110 (part 2)
Further, upon receiving notification from the identifier information adding unit 112, the navigation information table generating unit 113, and the stream correspondence information table generating unit 111 that the multiplex control unit 110 has finished the respective processes, the multiplex control unit 110 determines the number of contents T in a repetition unit. do. Here, the number of contents T in a repeating unit simply means the sum of the total number M of contents included in the transmission data 165 shown in FIG. 3 and the number of dummy contents. As the total number M of contents stored in the storage unit 102,
T that satisfies M ≦ P × S × n = T. Here, P represents the number of PIDs assigned to components for transmitting image data in the multiplex information storage unit 104 as described in the above equation (1), and S represents that described in the above equation (1). Similarly, it represents the number of stream_id. n is the smallest integer that satisfies M ≦ T. In this embodiment, since P = 1, S = 16, and M = 63, T is 64. When the number of contents T in the repetition unit is larger than the total number M of contents, the multiplexing control unit 110 multiplexes all the contents in the transport stream, and then more than the minimum contents (TM). Multiple null packets of the same size are multiplexed. This ensures that the interval D between the multiple positions of the image data and the stream correspondence table corresponding to the image data is a certain value or more ((P × S−1) times or more of the minimum content size). Can do.

  Next, the multiplexing control unit 110 stores in the multiplexing information storage unit 104 a length packet L corresponding to one round of the number of contents T in a repeating unit (all contents and a null packet size corresponding to the contents (TM)). The length of the transport stream when multiplexed at the bit rate B is a value expressed in units of 1/9000 seconds) using Equation (2).

Here, M and T are the above-mentioned total number of contents and the number of contents in a repeating unit, and S_VE (x), S_NVT (x), S_VET, P, and B are the same as those in the above-described expression (1). is there.
The multiplexing control unit 110 sets “0” in the content counter i and sets “0” in the multiplexing start position pointer wp. The value of wp represents the time from the first information position of the content multiplexed on the transport stream.

  Next, “0” is set to the value of the VET counter j. The number of laps C and the content number N are obtained using the value of the VET counter j. The circulation number C is an integer part of the quotient of {i + (P × S) −1−j} ÷ T, and the content number N is the remainder of {i + (P × S) −1−j} ÷ T. Next, it is determined whether or not the Nth VET (N) of the stream correspondence table is stored in the stream correspondence information table generation unit 111. If it is stored, the first_pts and last_pts of the VET (N) are set as a repetition unit. A value obtained by multiplying the length L of one turn of the content number T by the number of turns C is added.

  Next, the multiplexing unit 114 is instructed to multiplex the VET (N). At this time, the multiplex start position wp and the bit rate B are notified, the value of “VE_information_component_pid” in the multiplex information table 601 is notified as PID, and the “VE_id” corresponding to the content number “N” of the content identifier allocation table 701 is notified. The value is notified as table_id_extension.

When VET (N) is not stored in the stream correspondence information table generation unit 111, the multiplexing unit 114 is instructed to multiplex null packets corresponding to the size of S_VET, and the multiplexing start position wp and the bit rate B are notified.
After instructing the multiplexing unit 114 to perform multiplexing, the multiplexing start position wp is calculated. It can be calculated by wp = wp + S_VET / B. Next, “1” is added to the value of the VET counter j, and it is determined whether or not the values of the VET counter j and the number of repeated multiplexing R in the stream correspondence table match. The content number N is calculated, and the VET (N) multiplexing process is continued.

  When the multiplex control unit 110 determines that the values of both counters match, the multiplex number C and the content number N are calculated by the same method as described above, and the identifier information adding unit 112 or the navigation information table generating unit 113 is calculated. It is determined whether or not the content with the content number N is stored. If it is determined that it is stored, the multiplexing unit 114 is instructed to multiplex VE (N). At this time, the multiplexing unit 114 is notified of the values of the multiplexing start position wp, bit rate Bv (N), PID, and stream_id. Note that the values of “PID” and “stream_id” assigned to the image data with the value “VE_id” “N” are extracted from the display image information identifier assignment table 801 as the values of PID and stream_id. The bit rate Bv (N) is calculated by the following equation (3).

The symbols in the formula are the same as in the above formula (1).
Furthermore, the multiplexing unit 114 is instructed to multiplex NVT (N). At this time, the multiplexing unit 114 is notified of the multiplexing start position wp, bit rate Bn (N), PID, and table_id_extension values. For the PID, the multiplexed information storage unit 104 is referred to, and the PID value assigned to the component assigned for transmission of navigation information is extracted. For table_id_extension, the value of “NE_id” corresponding to the content number N is extracted from the content identifier assignment table 701. The bit rate Bn (N) is calculated by the following equation (4).

The symbols in the formula are the same as in the above formula (3).
Next, the multiplex control unit 110 obtains the multiplex start position wp by the calculation formula wp = wp + {S_VE (N) + S_NVT (N)} / B.
If the content N is not stored, the multiplexing control unit 110 instructs the multiplexing unit 114 to multiplex null packets corresponding to the size of S_VE (0) + S_NVT (0), and sets the multiplexing start position wp. Notice.

The size of the null packet to be multiplexed is the total size of S_VE (0) and S_NVT (0) of content number “0”, but S_VE (k) + S_NVT (k) that minimizes the size among all contents Minutes of null packets may be multiplexed.
Next, the multiplex control unit 110 obtains the multiplex start position wp by the calculation formula wp = wp + {S_VE (0) + S_NVT (0)} / B.

Next, “1” is added to the value of the content counter i, the value of the VET counter j is obtained again, and the processing after the multiplexing of VET (N) is repeated.
1-2-3-6. Multiplexer 114
The multiplexing unit 114 multiplexes the transmission data 165 shown in FIG. 3 in the MPEG2 transport stream. 16 and 17 are schematic diagrams of more specific multiplexed streams in which identification information is added to the schematic diagram shown in FIG. Details will be described below.

  The multiplexing unit 114 multiplexes data in the MPEG2 transport stream based on a method defined by the MPEG2 system standard based on an instruction from the multiplexing control unit 110. Upon receiving an instruction to multiplex the stream correspondence table VET (N) from the multiplex control unit 110, the stream correspondence table VET (N) is read from the stream correspondence information table generation unit 111, and the designated PID is designated from the designated multiplex start position wp. , Table_id_extension, and bit rate B are multiplexed in the transport stream. Also, upon receiving an instruction to multiplex image data VE (N) from the multiplex control unit 110, the corresponding image data with the identifier added is read from the identifier information adding unit 112, and the PID specified from the specified multiplex start position wp is read. , Stream_id, and bit rate Bv (N). Further, when the multiplexing control unit 110 instructs to multiplex the navigation information table NVT (N), the navigation information table is read from the navigation information table generating unit 113, and the PID, table_id_extension, specified from the specified multiplexing start position wp is read. Multiplexing in the transport stream using the bit rate Bn (N). When an instruction to multiplex null packets is given, null packets of a specified size are multiplexed at a specified bit rate B from a specified multiplexing start position wp.

For PCR, the initial value at the beginning of the generated transport stream is set to “0” and multiplexed using the PCR_PID notified from the multiplexing control unit 110.
FIG. 16 is a diagram illustrating an example of a transport stream generated by the multiplexing unit 114. In the transport stream 1701, 63 pieces of content stored in the transmission data storage unit 102 are multiplexed. The 63 pieces of image data VE (0) to VE (62) are given the value “0 × 0084” given in the multiplex information table 601 as PID, and “0xe0” to “0xef” are circulated as stream_id. Are given and multiplexed.

  Further, the stream correspondence table VET (N) is given the value “0 × 0083” given in the multiplex information table 601 as the PID, and the same value as the image data identifier “VE_id” is given as table_id_extension. Yes. The stream correspondence table VET (N) is multiplexed once for each image data VE (N). The number of repeated multiplexes R in the stream correspondence table is “1”.

The 63 navigation information tables NE (0) to NE (62) are given the value “0 × 0082” given in the multiplex information table 601 as PID, and the navigation information identifier “NE_id” of table_id_extension A value is given and multiplexed. In addition, a PCR 1702 including time reference information is multiplexed.
One transmission data 165 shown in FIG. 3 is a range from the stream correspondence table VET (15) to the null packet 1705 as indicated by an arrow 1708 in this figure.

  In the transport stream 1701, the stream correspondence table VET (N) is multiplexed at the previous position by 15 image data of the corresponding image data VE (N). Since 16 stream_ids are cyclically given to the image data, the same PID and stream_id as VE (N) are set between the stream correspondence table VET (N) and the corresponding image data VE (N). The other image data it has is not multiplexed. Therefore, after obtaining the stream correspondence table VET (N), the receiving apparatus 121 separates only the first image data that is given the same PID and stream_id, and obtains a desired image. Data VE (N) can be extracted. For example, there is no other image data given PID “0 × 0084” and stream_id “0xe0” between the stream correspondence table VET (16) 1703 and the image data VE (16) 1704. Therefore, the receiving apparatus 121 includes the stream correspondence table VET among the four pieces of image data VE (0), VE (16), VE (32), and VE (48) having the PID “0 × 0084” and the stream_id “0xe0”. (16) By separating the image data VE (16) that appears first after 1703, the desired image data VE (16) can be reproduced.

  Further, the transport stream 1701 is configured such that data of 15 contents are multiplexed between the stream correspondence table VET (N) and the corresponding VE (N). That is, the time D from the appearance of the stream correspondence table VET (N) to the appearance of the corresponding image data VE (N) is longer than the time required to transmit at least 15 pieces of the minimum size content. Is guaranteed. If the reception apparatus 121 interprets the information of the stream correspondence table during the time D and performs processing necessary for separation of the image data, the reception apparatus 121 can surely reproduce the desired image data. In order to guarantee that the time D is equal to or longer than the transmission time of 15 contents even in the vicinity of the repetitive circulation point, a null packet 1705 corresponding to the size of one content is multiplexed at the end of the circulation. As a result, when the circuit point is crossed between VET (N) and VE (N), for example, the interval between VET (0) 1706 and VE (0) 1707 is also required to transmit 15 pieces of minimum-sized content. Guaranteed to be more than hours.

FIG. 17 is a diagram illustrating an example of a transport stream generated by the multiplexing unit 114 when the repetition multiplexing number R of the stream correspondence table is “16”.
In the transport stream 1711, the stream correspondence table VET (N) is multiplexed 16 times from the position 15 contents before the corresponding image data VE (N) to the VE (N) multiplexing start position. ing. Since the receiving device 121 first acquires the stream correspondence table and then reproduces the corresponding image data, the shorter the time D, the faster the desired image data can be reproduced. However, when the time D becomes shorter, the receiving apparatus 121 has to interpret the stream correspondence table at a higher speed and perform processing necessary for separating the image data. If the stream correspondence table is multiplexed a plurality of times as in the transport stream 1711, the receiving device 121 obtains the stream correspondence table multiplexed at a position close to the image data when the load is light, and the image data is obtained at high speed. When the reproduction is performed and the load is heavy, it is possible to perform control such that the stream correspondence table multiplexed at a position far from the image data is acquired and the image data is reliably reproduced.

When the multiplexing unit 114 generates the transport stream 1701 as illustrated in FIG. 16, the multiplexing unit 114 sequentially outputs the transport stream 1701 to the transmission unit 106.
1-2-4. System information table generation unit 105
The system information table generation unit 105 is a network specification table (NIT), an EIT (Event Information Table), an SDT (Service Description Table), or a PAT (Program Association Table), which are program specification information used for program selection by the data receiving device 121. ) And PMT (Program Map Table) with reference to the multiple information storage unit 104 and the like.

   When receiving a notification from the multiplexing control unit 110, the system information table generation unit 105 first refers to the multiplexing information storage unit 104, and the data reception device 121 selects an event for multiplexing the data stored in the transmission data storage unit 102. NIT, EIT, SDT, and PAT including necessary information are generated according to the DVB-SI standard and MPEG2 system standard.

   The NIT records physical information and the like regarding a transmission path for each transport stream transmitted from a network identified by a specific network. FIG. 18A shows an example of the NIT 1301 generated by the system information table generation unit 105. In a network identified by network_id “0 × 0001”, a transport stream identified by original_network_id “0 × 0001” and transport_stream_id “0 × 0001” is transmitted. It shows that it is expressed by “transmission specifications”.

   The SDT records information such as a service name for each service included in a specific transport stream. FIG. 18B shows an example of the SDT 1302 generated by the system information table generation unit 105. The transport stream identified by transport_stream_id “0 × 0001” includes a service identified by service_id “0 × 0001”. Information such as the service name is “information such as service name”. It is shown that.

   The EIT records information about an event name, start time, end time, and the like for each event included in a specific service. FIG. 18C shows an example of the EIT 1303 generated by the system information table generation unit 105. The service identified by service_id “0x0001” includes an event identified by event_id “0x0001”. Information such as the event name is represented by “information such as event name”. Which indicates that.

   The PAT records PID information of a PMT (program map table) for each program included in a specific transport stream. FIG. 19 shows an example of the PAT 1401 generated by the system information table generation unit 105. This indicates that the transport stream identified by transport_stream_id “0 × 0001” includes a program whose program_no is “0 × 0001” and the PID of the PMT is “0 × 0080”. program_no corresponds to service_id, and the program corresponds to an event.

   Next, the system information table generation unit 105 refers to the multiplex information storage unit 104, the multiplex control unit 110, and the structure information storage unit 109, and creates a program in which transmission data stored in the transmission data storage unit 102 is multiplexed. A corresponding PMT is generated according to the provisions of the MPEG2 system standard. FIG. 20 shows an example of the PMT generated by the system information table generation unit 105. “Program_number” is a value indicating a program number of a program in which transmission data is multiplexed, and a value “0 × 0001” of “service_id” in the multiplexing information table 601 is extracted and written therein.

   “PCR_PID” is a value indicating the PID of a packet including clock information (PCR) that is a reference for decoding this program, and this includes the value “0 × 0081” of “PCR_PID” in the multiplex information table 601. Is extracted and written. “Entry_Descriptor” is a descriptor including identifier information of an entry content to be reproduced first when this program is selected. FIG. 21A shows an example of “Entry_Descriptor”. Descriptor_tag is an identifier indicating the type of descriptor, and a value (here, 0 × 98) defined for “Entry_Descriptor” is written in this descriptor.

   “Entry_VE_id”, “entry_AE_id”, and “entry_NE_id” indicate identifier values that identify image data, audio data, and navigation information that constitute entry content. The content number “5” of the entry content is obtained by referring to the entry information 502 of the structure information storage unit 109, and “VE_id” corresponding to the content number “5” is referred to by referring to the identifier assignment table 701 of the multiplexing control unit 110. Value “0 × 0005”, “AE_id” value “−”, and “NE_id” value “0 × 0005” are extracted and written in “entry_VE_id”, “entry_AE_id”, and “entry_NE_id”, respectively.

  A list 1502 in the PMT 1501 includes a PID value “PID” for identifying each component constituting the program, “stream_type” indicating the type of data transmitted by each component, and a descriptor associated with each component. Information. First, the system information table generation unit 105 extracts a value “0 × 0082” corresponding to “NE_component_pid” from the multiplex information table 601 for the component that transmits navigation information, writes it as “PID”, and is transmitted by this component. A value “0 × 05” indicating that the data type is section data is written as “stream_type”, and NE_Component_Descriptor indicating that this component transmits navigation information is written as “descriptor (descriptor)”. An example of NE_Component_Descriptor is shown in FIG. 21B. In the descriptor_tag, a value (here, 0 × 99) determined for “NE_Component_Descriptor” is written.

   Next, for the component transmitting the stream correspondence table, the value “0 × 0083” corresponding to “VE_information_component_pid” is extracted from the multiplex information table 601 and written as “PID”, and the type of data transmitted by this component is section data. Is written as “stream_type”, and VE_Information_Component_Descriptor indicating that this component transmits the stream correspondence table is written as “descriptor”. FIG. 21C shows an example of VE_Information_Component_Descriptor. In “descriptor_tag”, a value (here, 0 × 9a) determined for “VE_Information_Component_Descriptor” is written.

   Next, the system information table generation unit 105 extracts the value “0 × 0084” corresponding to “VE_component_pid” from the multiplex information table 601 for the component that transmits the image data, writes it as “PID”, and is transmitted by this component. A value “0 × 02” indicating that the type of data to be recorded is a video stream is written as “stream_type”, and a stream_identifier_descriptor indicating the component tag value of this component is written as “descriptor”. FIG. 21D shows an example of stream_identifier_descriptor. In “descriptor_tag”, a value (here, 0 × 52) defined for “stream_identifier_descriptor” is written. In “component_tag”, the display image information identifier assignment table 801 of the multiplex control unit 110 is referred to, and the value “0 × 00” of component_tag assigned to the component whose “PID” is “0 × 0084” is extracted. Written.

1-2-5. Transmitter 106
The transmission unit 106 includes a scheduler, and activates the multiplexing control unit 110 when a predetermined time, for example, 5 minutes before the event transmission start time. When the event transmission start time comes, the system information table such as NIT, PAT, PMT, SDT, EIT generated by the system information table generating unit 105 is added to the transport stream output from the multiplexing unit 112 in the DVB-SI standard. In accordance with the provisions of the MPEG2 system standard, the data is repeatedly multiplexed at a predetermined interval using a predetermined PID, subjected to processing such as modulation, and transmitted to the data receiving apparatus 121 or the like.

FIG. 22 is a diagram schematically showing a multiplexed transport stream 1801. NIT 1802, PAT 1803, PMT 1804, SDT 1805, and EIT 1806 are further multiplexed on the transport stream 1701 multiplexed by the multiplexing unit 114.
1-2-6. Operation of Data Transmitting Apparatus 101 Next, the operation of the data transmitting apparatus 101 according to the present embodiment will be described with reference to the flowcharts shown in FIGS.

   First, the multiplexing control unit 110 creates an identifier assignment table by assigning VE_id and NE_id for each content number (S1902). Next, a display image information identifier assignment table 801 is created (S1904), identifier information addition unit 112 adds identifier information, navigation information table creation unit 113 creates a navigation information table, and stream correspondence information table generation unit. 111 is instructed to generate a stream correspondence table.

   The identifier information adding unit 112 adds the image data identifier to the private area of the bit stream of the image data stored in the presentation information storage unit 107 and stores it. When the addition of identifiers for all image data is completed, the multiplexing control unit 110 is notified of this (S1906). The navigation information table generation unit 113 creates a navigation information table from the navigation information stored in the navigation information storage unit 108. When the creation of all the navigation information tables is completed, this is notified to the multiplexing control unit 110 (S1908).

The stream correspondence information table generation unit 111 refers to the display image information identifier allocation table 801 created by the multiplexing control unit 110 and generates a stream correspondence table. When the generation of all the stream correspondence tables is completed, this is notified to the multiplexing control unit 110 (S1910).
The system information table generation unit 105 generates various system information tables such as NIT, SDT, EIT, PAT, and PMT (S1912).

   The multiplexing control unit 110 determines the number of contents T as a repetition unit when the contents are multiplexed on the transport stream (S1914). Length L of the content number T for one round (the transport stream of the content stream is multiplexed at the bit rate B stored in the multiplex information storage unit 104 with null packets for the size of the content M−T. (Length) is calculated in units of 1/9000 seconds (S1916). The multiplexing control unit 110 notifies the multiplexing unit 114 of the PCR_PID and instructs the multiplexing of the PCR (S1918). Next, “0” is set for both the content counter i and the multiplexing start position wp (S2002).

Next, the multiplexing control unit 110 sets “0” to the VET counter j (2004). The number of laps C and the content number N are obtained. C is the quotient (integer part) of {i + (P * S) -1-j} / T, and N is the remainder (integer) (S2006).
Next, the multiplexing control unit 110 determines whether or not the stream correspondence table VET (N) is stored in the storage area of the stream correspondence information table generation unit 111 (S2008). C) L is added to first_pts and last_pts of N) (S2010).

   The multiplexing control unit 110 instructs the multiplexing unit 114 to multiplex the stream correspondence table VET (N) into the transport stream, and notifies the multiplexing start position wp, bit rate B, PID, and table_id_extension (S2012). The process proceeds to S2014. In S2008, when the multiplexing control unit 110 determines that the VET (N) of the stream correspondence table is not stored, the multiplexing control unit 110 instructs the multiplexing unit 114 to multiplex null packets of the same size as S_VET, and starts multiplexing. The position wp and the bit rate B are notified. The multiplexing unit 114 multiplexes null packets in the transport stream (S2018), and proceeds to S2014.

In S2014, the multiplexing control unit 110 calculates wp = wp + {S_VET / B}, adds “1” to the value of the VET counter j (S2015), and sets the value of the VET counter j and the stream correspondence table VET (N). The value of the repeated multiplexing number R is compared (S2016). When j = R, the process proceeds to S2102, and when j <R, the process returns to S2006.
In S2102, the multiplexing control unit 110 sets the number of laps C as the quotient of i / T (integer part) and the content number N as the remainder of i / T (integer). Next, it is determined whether or not there is content with content number N with reference to the content identifier assignment table in structure information storage unit 109 (S2104). If there is, the bit stream of image data VE (N) is multiplexed. Instructs the multiplexing unit 114. At this time, the bit rate Bv (N) is calculated, and Bv (N) is notified to the multiplexing unit 114 together with the multiplexing start position wp and the values of “PID” and “stream_id” recorded in the display image information identifier allocation table 801. . The multiplexing unit 114 multiplexes the image data VE (N) on the transport stream (S2106).

   Next, the multiplexing control unit 110 instructs the multiplexing unit 114 to multiplex the navigation information table NVT (N). At this time, the bit rate Bn (N) is calculated, and Bn (N) is notified to the multiplexing unit 114 together with the multiplexing start position wp, PID, and table_id_extension. The multiplexing unit 114 multiplexes the navigation information table NVT (N) on the transport stream (S2108).

The multiplexing control unit 110 calculates the multiplexing start position wp.
wp = wp + {S_VE (N) + S_NVT (N)} / B (S2110). “1” is added to the content counter i (S2112), and the process returns to S2004.
If it is determined in S2104 that there is no such, the multiplexing control unit 110 instructs multiplexing of null packets corresponding to the size of S_VE (0) + S_NVT (0) together with the multiplexing start position wp and the bit rate B. The multiplexing unit 114 multiplexes the instructed amount of null packets into the transport stream (S2114).

   The multiplexing control unit 110 obtains the multiplexing start position wp by wp = wp + {S_VE (0) + S_NVT (0)} / B (S2116), and proceeds to S2112. By the above operation, for example, when the repetition multiplexing number R of the stream correspondence table VET (N) is set to “1”, a multiplexed stream as shown in FIG. 16 is obtained, and when R is set to “16”, FIG. A transport stream as shown in FIG. 22 in which NIT, RAT, etc. are multiplexed in the multiplexed stream as shown is transmitted.

1-2-7. Summary As described above, the data transmission apparatus 101 according to the present embodiment multiplexes the image data and navigation information constituting each content in the transport stream by assigning identifiers and repeatedly transmits them.
The navigation information includes an identifier of image data of hyperlinked content, an identifier of navigation information, auxiliary screen information for displaying a menu, and a script for screen switching. Therefore, the receiving apparatus 121 can retrieve and play back arbitrary content by designating an identifier from the transport stream according to the navigation information, and can realize interactivity with a one-way communication path.

1-2-8. Others 1-2-8-1.
Although the case where the image data is a still image has been described in the present embodiment, the image data may be moving image data. When the image data is moving image data, the formulas “first_pts” and “last_pts” in equation (1), the stream length L equation in equation (2), and the image data VE (N) in equation (3) Formula for calculating bit rate Bv (N) to be allocated, formula for calculating bit rate Bn (N) allocated to navigation information table NVT (N) in formula (4), and image data VE (N) and navigation information in multiplexing control unit 110 The formula for recalculating the multiplexing start position wp after multiplexing the table NVT (N) can be realized, for example, by changing as follows.

  In the case of a moving image, the bit rate Bv (N) to be assigned to the image data VE (N) is determined in consideration of an increment at the time of conversion into a transport stream based on a bit rate predetermined by the video elementary stream. The navigation information table NVT (N) is assigned the remainder obtained by subtracting the bit rate Bv (N) assigned to the image data VE (N) from the overall bit rate B.

  At this time, the value of “first_pts” of the image data VE (N) can be calculated according to the equation (5).

However, Bv (x) is a bit rate assigned to the image data VE (x), and S_VE_FIRST (x) is a value obtained when the first frame of the image data VE (x) is converted into a transport stream in accordance with the MPEG2 system standard. The size, MAX {A, B}, represents the larger value of A and B, respectively.
In the case of a moving image, “last_pts” does not match “first_pts”, and can be obtained by, for example, Expression (6).

  However, N_FRAME (X) represents the number of frames of the moving image data VE (X), and FRAME_PER_SEC represents the number of frames per second (for example, 29.97 for the NTSC system). At this time, in the case of a moving image, the multiplexing control unit 110 instructs the multiplexing unit 114 to multiplex VE (X) and NE (X), and then updates wp according to Expression (7).

1-2-8-2.
In this data transmitting apparatus 101, the multiplexing unit 114 is configured to sequentially generate the transport stream 1701 during the event transmission time. However, the multiplexing unit 114 has a length L of one cycle. A port stream may be generated and stored, and when the transmission unit 106 transmits the data to the data reception device 121 or the like, the transport stream may be repeatedly read out and repeatedly transmitted with predetermined processing.

1-2-8-3.
In the present embodiment, the corresponding image data and the navigation information table \ u are multiplexed at the same time, but it is not necessary to have the same time. Since the navigation information table and the image data corresponding to the navigation information table can be individually separated as described above, they may be multiplexed at different times.

1-3. Data receiving device 121
As described with reference to FIG. 1, the data receiving apparatus 121 interactively extracts and reproduces content from the MPEG2 transport stream transmitted from the data transmitting apparatus 101 according to a user operation.
1-3-1. Receiver 122
The receiving unit 122 receives the MPEG2 transport stream corresponding to the transport stream identifier specified by the reception control unit 126, and outputs it to the TS decoder unit 123.

1-3-2. TS decoder unit 123
The TS decoder unit 123 includes a filter condition storage unit 131 that stores a filter condition set by the reception control unit 126. According to this filter condition, a specified identifier is selected from the transport stream output from the reception unit 122. Only the image data or audio data having “” is separated and output to the AV decoder unit 124. Further, the table data having the specified identifier is separated and output to an area secured in the received data storage unit 125 according to the identifier. Further, the PCR (reference clock information) of the specified identifier is separated and output to the AV decoder unit 124. The filter condition storage unit 131 can simultaneously store a plurality of filter conditions, and the TS decoder unit 123 can perform a plurality of separation processes in parallel.

   26A and 26B are diagrams illustrating an example of the filter condition table stored in the filter condition storage unit 131. FIG. Each row of the filter condition table 2201 indicates one filter condition. The “filter identification number” column 2202 describes a number for identifying each filter condition. In the “START / STOP” column 2203, “START” is set when each filter condition is set to the start state, and “STOP” is set when the filter condition is set to the stop state. The TS decoder unit 123 performs separation processing based on the filter condition in the start state, and does not perform separation based on the filter condition in the stop state. In the “PID” column 2204, the PID value of data to be separated under each filter condition is set. In the “stream_id” column 2205, the value of the stream_id of data to be separated according to each filter condition is set. In the “table_id_extension” column 2206, the value of table_id_extension of data to be separated under each filter condition is set. When the value “-” is set in the “PID” field 2204, the “stream_id” field 2205, and the “table_id_extension” field 2206, it indicates that there is no condition, that is, the identifier is separated regardless of the value. Yes. In the “output destination” column 2207, an output destination for outputting the separated data is set.

  The row corresponding to the filter identification number “0” in the filter condition table 2201 indicates the filter condition of the image data. In the “output destination” column 2207, the AV decoder unit 124 is set, and the “table_id_extension” 2206 cannot be set. In the “PID” 2204 and the “stream_id” 2205, the PID and stream_id values of the image data to be separated by the reception control unit 126 are set.

  The row corresponding to the filter identification number “1” indicates the filter condition of the audio data. The AV decoder unit 124 is set in the “output destination” column 2207, and no value can be set in the “table_id_extension” column 2206. In the “PID” column 2204 and the “stream_id” column 2205, the PID of the audio data to be separated by the reception control unit 126 and the value of the stream_id are set.

  The row corresponding to the filter identification number “2” indicates the filter condition of the stream correspondence table VET. In the “output destination” 2207, the stream correspondence information table storage unit 132 is set, and a value cannot be set in the “stream_id” column 2205. In the “PID” column 2204 and the “table_id_extension” column 2206, the PID of the stream correspondence table to be separated by the reception control unit 126 and the value of the table_id_extension are set.

  The row corresponding to the filter identification number “3” indicates the filter condition of the navigation information table. The navigation information table storage unit 133 is set in the “output destination” column 2207, and a value cannot be set in the “stream_id” column 2205. In the “PID” column 2204 and the “table_id_extension” column 2206, values of the PID of the navigation information table to be separated by the reception control unit 126 and the table_id_extension are set.

In addition, in the “START / STOP” column 2203 of each filter condition, “START” or “STOP” is set by the reception control unit 126, and the separation process of the TS decoder unit 123 is set to a start state or a stop state. .
In addition to these, the filter condition storage unit 131 stores system information tables such as NIT, SDT, EIT, PAT, and PMT, and filter conditions (not shown) for PCR (reference clock information).

In the filter condition table 2201, the filter condition for the image data corresponding to the filter identification number “0” and the filter condition for the audio data corresponding to the filter identification number “1” are set to the stop state by the reception control unit 126. At this time, the TS decoder unit 123 does not separate image data and audio data.
Further, in the filter condition table 2201, the filter condition of the stream correspondence table VET corresponding to the filter identification number “2” is set by the reception control unit 126 so that the value of “PID” is “0x0083” and the value of “table_id_extension” is “ 0x0005 "and the START / STOP column 2203 is set to the start state. At this time, the TS decoder unit 123 separates the stream correspondence table VET (5) corresponding to the set filter condition from the transport stream 1801 shown in FIG. The data is stored in the table storage unit 132 and notified to the reception control unit 126. The contents of VET (5) are as shown in FIG. 15A.

  In the filter condition table 2201, the filter condition of the navigation information table NVT corresponding to the filter identification number “3” is set by the reception control unit 126 so that the value of “PID” is “0x0084” and the value of “table_id_extension” is “ 0x0005 "and the START / STOP column 2203 is set to the start state. At this time, the TS decoder unit 123 separates the navigation information table NVT (5) corresponding to the set filter condition from the transport stream 1801 shown in FIG. The information is stored in the unit 133 and notified to the reception control unit 126. The contents of the navigation information table NVT (5) are as shown in FIG.

  In the filter condition table 2208, the filter condition of the image data corresponding to the filter identification number “0” is set by the reception control unit 126 so that “PID” is “0x0084” and “stream_id” is “0xe5”. , Is set to the start state. At this time, the TS decoder unit 123 transmits the image data VE (5), the image data VE (21), and the image data VE (21) according to the set filter condition from the transport stream 1801 shown in FIG. The image data VE (37) and the image data VE (53) are separated in the order received, and are output to the AV decoder unit 124. Which image data among the four image data is first separated depends on the timing when the reception control unit 126 sets the filter condition to the start state. Further, the reception control unit 126 sets the filter condition to a stop state at an appropriate timing so that only the first one of the four image data is separated and output to the AV decoder unit 124. it can.

1-3-3. AV decoder unit 124
The AV decoder unit 124 has a clock unit (not shown). This clock unit is set to the correct reference time according to the value of the PCR (reference clock information) output from the TS decoder unit 123, and counts the reference time for decoding the image data and audio data while synchronizing them correctly. To do.

  When the AV decoder unit 124 receives the image data and / or audio data output from the TS decoder unit 123, the AV decoder unit 124 first receives the image data and audio data written in the private area according to the instruction of the reception control unit 126. The identifier is read and notified to the reception control unit 126. Next, in accordance with an instruction from the reception control unit 126, the image data and audio data are decoded for each decoding unit, output to the reproduction unit 128 while being synchronized by the clock unit, and the reception control unit 126 is notified of the completion of decoding. .

1-3-4. Configuration of Reception Data Storage Unit 125 The reception data storage unit 125 includes, for example, a RAM, and includes a stream correspondence information table storage unit 132, a navigation information table storage unit 133, and a system information table storage unit 134.
The stream correspondence information table storage unit 132 stores the stream correspondence table separated by the TS decoder unit 123. The navigation information table storage unit 133 stores the navigation information table separated by the TS decoder unit 123. The system information table storage unit 134 stores system information tables such as NIT, SDT, EIT, PAT, and PMT separated by the TS decoder unit 123.

1-3-5. Signal receiver 127
The signal reception unit 127 receives a signal such as a user's remote control operation and notifies the reception control unit 126 of the signal.

1-3-6. Playback unit 128
In accordance with an instruction from the reception control unit 126, the playback unit 128 superimposes the graphics data included in the navigation information table output from the reception control unit 126 on the image data decoded by the AV decoder unit 124, and displays it. The audio data output to the unit 129 and the audio data decoded by the AV decoder unit 124 are output to the audio output unit 130.

1-3-7. Display unit 129
The display unit 129 is realized by a CRT, a liquid crystal display, or the like, and displays an image output from the playback unit 128. The contents 151, 152, 153, etc. shown in FIG. 1 are displayed.
1-3-8. Audio output unit 130
The audio output unit 130 is realized by a speaker or the like, and outputs the audio output from the reproduction unit 128.

1-3-9. Configuration of reception control unit 126
The reception control unit 126 controls the reception unit 122 to receive a desired transport stream. When the user's operation signal is received via the signal receiving unit 127, the navigation information table currently stored in the navigation information table storage unit 133 is referred to, and the filter condition of the navigation information table to be separated next, the image The filter condition of the stream correspondence table for acquiring data is set in the filter condition storage unit 131 of the TS decoder unit 123. The filter condition of the image data is set in the filter condition storage unit 131 with reference to the stream correspondence table separated by the TS decoder unit 123 and stored in the stream correspondence information table storage unit 132.

  The reception control unit 126 determines whether the image data separated by the TS decoder unit 123 is appropriate image data with reference to the image data identifier written in the private area of the image data. When the image data is appropriate, it is decoded by the AV decoder unit 124 and output to the reproduction unit 128. If the image data is not appropriate, the condition of the filter condition storage unit 131 is changed, and the stream correspondence table is instructed again.

Also, the bitmap data of the object included in the navigation information table separated by the TS decoder unit 123 is read out, notified to the reproduction unit 128, and displayed over the image data.
1-3-9-1. Initial control The reception control unit 126 includes a CPU and a program that controls the CPU, and is stored in the transmission data storage unit 102 in the transport stream transmitted by the transmission unit 106 of the data transmission apparatus 101 by the user. When an event in which transmission data is multiplexed is first selected, first, a system information table is created in accordance with procedures defined in the MPEG2 system standard and DVB-SI standard used in general satellite digital broadcast receivers. The reception unit 122 is instructed to receive the transport stream transmitted by the transmission unit 106, and the TS decoder unit 123 is instructed to separate the PMT corresponding to the selected event.

  Next, the reception control unit 126 refers to the PMT recorded in the system information table storage unit 134, acquires the PCR identifier, and sets it in the filter condition storage unit 131. Further, the reception control unit 126 acquires the identifier of the image data of the entry content and the navigation information, and sets them as the filter condition of the stream correspondence table and the filter condition of the navigation information table in the filter condition storage unit 131, respectively.

  Further, the reception control unit 126 refers to the PMT in the system information table storage unit 134, acquires the PID values of the component that transmits the stream correspondence table and the component that transmits the navigation information table, The filter conditions of the stream correspondence table in the storage unit 131 and the filter conditions of the navigation information table are set, and these filter conditions are set to the start state.

  When receiving notification of separation of the stream correspondence table from the TS decoder unit 123, the reception control unit 126 sets the filter condition of the stream correspondence table in the filter condition storage unit 131 to a stopped state. Next, the reception control unit 126 refers to the stream correspondence table in the stream correspondence information table storage unit 132, reads the value of “stream_id” of the image data, and sets the filter condition of the image data in the filter condition storage unit 131. . Next, the value of “component_tag” is read with reference to the stream correspondence table in the stream correspondence information table storage unit 132, and further read to the value of “component_tag” read with reference to the PMT in the system information table storage unit 134. The corresponding PID value is acquired, the filter condition of the image data in the filter condition storage unit 131 is set, and this filter condition is set to the start state.

1-3-9-2. Determination of Appropriateness of Image Data Note that the data transmission apparatus 101 may transmit a plurality of different image data with the same value of PID and stream_id, but after transmitting a stream correspondence table corresponding to a certain image data, After a certain time, the image data is transmitted so as to appear before other image data having the same value of PID and stream_id. Thus, if the reception control unit 126 completes the setting of the filter condition of the image data within a certain time after receiving the stream correspondence table, the TS decoder unit 123 separates the desired image data without error, and the AV decoder unit 124 can be output.

  Next, the reception control unit 126 acquires the value of the image data identifier described in the private area of the image data output from the TS decoder unit 123 via the AV decoder unit 124, and acquires the image data currently being acquired. Check if it matches the identifier. If they do not match, the filter condition of the image data in the filter condition storage unit 131 is set to the stopped state, and the PID of the component that transmits the stream correspondence table and the current acquisition condition are set as the filter condition of the stream correspondence table. The identifier of the image data is set, and the filter condition of the stream correspondence table is set to the start state. Note that the value of the identifier “table_id_extension” in the stream correspondence table is the same as the value of the identifier “VE_id” in the image data. As a result, even if there is a delay in the process in which the reception control unit 126 sets the filter condition of the image data with reference to the stream correspondence table for some reason, another image data is displayed by mistake. Can be prevented.

  When the identifier value described in the private area of the image data output from the TS decoder unit 123 matches the identifier of the image data currently being acquired, the reception control unit 126 determines the stream correspondence information. The value of “first_pts” is read with reference to the stream correspondence table in the table storage unit 132. Then, with reference to the clock section of the AV decoder section 124, it is checked whether or not a notification of completion of frame decoding is received from the AV decoder section 124 by the time of the read value of “first_pts”. When there is no notification of completion of decoding, the filter condition of the image data in the filter condition storage unit 131 is set to the stop state, and the PID of the component that transmits the stream correspondence table and the current acquisition condition are set as the filter condition of the stream correspondence table. The image data identifier is reset, and the filter condition of the stream correspondence table is set to the start state.

As a result, even if there is a delay in the process in which the reception control unit 126 sets the filter condition of the image data by referring to the stream correspondence table for some reason, the image data is cut off from the beginning and reproduced from the middle. Can be prevented.
When the AV decoder unit 124 receives a frame decoding completion notification, the reception control unit 126 refers to the stream correspondence table in the stream correspondence information table storage unit 132 and reads the value of “last_pts”. Then, referring to the clock unit of the AV decoder unit 124, when the time of the read “last_pts” value is reached, the filter condition of the image data in the filter condition storage unit 131 is set to the stop state. Thereby, only desired image data is separated and output to the AV decoder 124. Therefore, other image data having the same PID and stream_id are not separated.

1-3-9-3. Generation of Graphics Information In addition, upon receiving notification of separation of the navigation information table from the TS decoder unit 123, the reception control unit 126 sets the filter condition of the navigation information table in the filter condition storage unit 131 to a stopped state. Next, the reception control unit 126 refers to the object definition table in the navigation information table in the navigation information table storage unit 133 to acquire the display coordinates “X” and “Y” of the button object, and subsequently the index value is For the “0” button, the “Focused Bitmap” index value is obtained, and for the other buttons, the “Normal Bitmap” index value is obtained and the bitmap table is referred to, and the bitmap data corresponding to the index value is obtained. Is generated, and button graphics information is generated based on these and output to the playback unit 128.

1-3-9-4. Interpretation of User Operation In addition, the reception control unit 126 initializes a variable cur_focus indicating the index value of the button object currently selected to “0”.
Further, when receiving the user operation signal from the signal receiving unit 127, the reception control unit 126 determines whether the user operation signal is “up”, “down”, or “determined”. . When the user operation signal is “up” or “down”, the value of the variable cur_focus is decreased or increased by “1”. Next, the navigation information table in the navigation information table storage unit 133 is referred to. First, the display coordinates “X” and “Y” of the button object are obtained by referring to the object definition table, and then the index value is a variable. For buttons equal to the value of cur_focus, obtain the index value of “Focused Bitmap”, and for the other buttons, obtain the index value of “Normal Bitmap”, refer to the bitmap table, and refer to the bit corresponding to the index value. Map data is acquired, button graphics information is generated based on the map data, and output to the playback unit 128.

   When the user's operation signal is “confirmed”, the reception control unit 126 refers to the object definition table of the navigation information table NVT stored in the navigation information table storage unit 133, and the index value is a variable. The index value of the handler of the button object equal to the value of cur_focus is acquired, the handler definition table is referenced, and the instruction word is read from the handler corresponding to the index value. When the instruction word is “goto_contents”, the index value of the argument is further read, the hyperlink table is referenced, and the identifier of the linked content corresponding to the read index value is used as the identifier of the content to be reproduced next Read.

When the instruction word is “goto_entry”, the PMT of the event to which the navigation information table of the currently reproduced content belongs in the system information table storage unit 134 is referred, and the identifier of the entry content is used as the identifier of the content to be reproduced next. Read.
1-3-9-5. Setting Filter Conditions The reception control unit 126 does nothing if the identifier of the content to be reproduced next is equal to the identifier of the currently reproduced content. When the original_network_id and transport_stream_id of the content to be reproduced next are different from the currently received transport stream, the system information table is referred to according to the procedure defined in the MPEG2 system standard and the DVB-SI standard, and the desired trans The reception unit 122 is instructed to receive the port stream. When the designated transport stream belongs to another network as an operation of the receiving unit 122, processing such as changing the direction of the antenna is performed, and the designated transport stream is received.

When the event to which the image data of the content to be reproduced next belongs is different from the event to which the image data of the currently reproduced content belongs, the reception control unit 126 similarly refers to the system information table and reproduces the content to be reproduced next The PMT identifier of the event to which the image data belongs is set in the filter condition storage unit 131 of the TS decoder unit 123.
The TS decoder unit 123 separates the PMT according to the filter condition, stores it in the system information table storage unit 134, and notifies the reception control unit 126 of it.

When the reception control unit 126 receives the PMT separation notification of the event to which the image data belongs from the TS decoder unit 123, the reception control unit 126 refers to the PMT and sets the value of “PCR_PID” in the filter condition storage unit 131.
Also, when the event to which the navigation information of the next content to be reproduced belongs is different from the event to which the navigation information of the currently reproduced content belongs, the reception control unit 126 similarly refers to the system information table and reproduces the next event. The PMT identifier of the event to which the navigation information of the content to be assigned belongs is set in the filter condition storage unit 131 of the TS decoder unit 123.

   When the value of the identifier “VE_id” of the image data of the content to be reproduced next is different from the value of the identifier “VE_id” of the image data of the currently reproduced content, the reception control unit 126 stores the content of the system information table storage unit 134. Next, referring to the PMT of the event to which the image data of the content to be played belongs, obtain the PID of the component attached to VE_Information_Component_Descriptor, and set it as the filter condition of the stream correspondence table in the filter condition storage unit 131 together with the value of “VE_id” Then, this filter condition is set to the start state.

   When the value of the identifier “NE_id” of the navigation information of the content to be reproduced next is different from the value of the identifier “NE_id” of the navigation information of the currently reproduced content, the reception control unit 126 stores the navigation information in the system information table storage unit 134. Next, referring to the PMT of the event to which the navigation information of the content to be played belongs, the PID of the component attached to NE_Component_Descriptor is acquired, and set in the filter condition of the navigation information table in the filter condition storage unit 131 together with the value of “NE_id” Then, this filter condition is set to the start state.

1-3-10. Specific example of content display in the data reception device 121 For example, the original_network_id multiplexed to the transport stream 1801 of FIG. 22 is “0x0001”, the transport_stream_id is “0x0001”, the service_id is “0x0001”, and the event_id is “0x0001” When the event to be identified is first selected by the user, the reception control unit 126 refers to the NIT 1301 shown in FIG. 18A according to the procedure defined in the MPEG2 system standard or the DVB-SI standard, and the original_network_id Of the transport stream 1801 identified by “0x0001” and transport_stream_id “0x0001” 19 is obtained, and the reception unit 122 is instructed to receive the transport stream 1801. Similarly, referring to the PAT 1401 shown in FIG. 19, “program_no” is equal to the value of service_id, that is, “0x0001”. The PID value “0x0080” of the PMT of the program is acquired, and this is set as the PMT filter condition in the filter condition storage unit 131.

  The TS decoder unit 123 separates the PMT 1501 shown in FIG. 20, stores it in the system information table storage unit 134, and notifies the reception control unit 126. The reception control unit 126 reads the value “0x0081” of “PCR_PID” from the PMT 1501 stored in the system information table storage unit 134 and sets it as the PCR filter condition in the filter condition storage unit 131. Next, the reception control unit 126 refers to the Entry_Descriptor shown in FIG. 21A in the PMT 1501, extracts the value “0x0005” of “entry_VE_id”, and sets it to “table_id_extension” of the filter condition of the stream correspondence table in the filter condition storage unit 131. Set. Next, the reception control unit 126 acquires the PID value “0x0083” of the component attached to VE_Information_Component_Descriptor from the PMT 1501, and similarly sets it to “PID” in the filter condition of the stream correspondence table, and Set the filter condition to the start state.

  Next, the reception control unit 126 refers to the Entry_Descriptor shown in FIG. 21A in the PMT 1501, extracts the value “0x0005” of “entry_NE_id”, and sets the filter condition “table_id_extension” in the navigation information table in the filter condition storage unit 131. Set. Next, the reception control unit 126 obtains the PID value “0x0082” of the component attached to the NE_Component_Descriptor from the PMT 1501 and similarly sets it to “PID” of the filter condition of the navigation information table, and filters the navigation information table Put the condition in the start state.

   The TS decoder unit 123 separates the stream correspondence table 1201 shown in FIG. 15A, stores it in the stream correspondence information table storage unit 132, notifies the reception control unit 126, and separates the navigation information table 1001 shown in FIG. The information is stored in the navigation information table storage unit 133 and notified to the reception control unit 126. When receiving the stream correspondence table separation notification, the reception control unit 126 refers to the stream correspondence table 1201 of the stream correspondence information table storage unit 132, acquires the value “0xe5” of “stream_id”, and stores it in the filter condition storage unit 131. The image data filter condition “stream_id” is set. Next, the value “0x00” of “component_tag” is acquired from the stream correspondence table 1201, and further, the PMT1501 in the system information table storage unit 134 is referred to and the value of “component_tag” is attached to the stream_identifier_descriptor with “0x00” The value “0x0084” of the component “PID” of which the type of data to be transmitted is image data is acquired and set to “PID” of the filter condition of the image data in the filter condition storage unit 131, and this filter condition is set. Set to the start state.

When the value of “PID” is directly written instead of the value of “component_tag” in the stream correspondence table, the reception control unit 126 reads “stream_id” from the stream correspondence table without referring to the PMT. The value “PID” is acquired, and the filter condition of the image data in the filter condition storage unit 131 is set.
The TS decoder unit 123 separates the bit stream 901 of the image data shown in FIG. 12 and outputs it to the AV decoder unit 124. The bit stream 901 of image data is obtained by writing a value “0x0005” of “VE_id” in the private area of the still image data 201 shown in FIG. 5A. The reception control unit 126 receives the notification of the identifier value “0x0005” written in the private area of the separated image data via the AV decoder unit 124, and receives the value “0” previously set in the table_id_extension of the stream correspondence table. X0005 "is confirmed. Next, with reference to the clock unit of the AV decoder unit 124, the AV decoder unit 124 notifies the success notification that the image data has been successfully decoded by the time “112500” of the “first_pts” value in the stream correspondence table 1201. Upon confirmation, the time of the “last_pts” value “112500” in the stream correspondence table 1201 is waited, and the filter condition of the image data in the filter condition storage unit 131 is set to the stop state.

   Further, upon receiving the notification of separation of the navigation information table, the reception control unit 126 first sets the variable cur_focus to “0”, refers to the navigation information table 1001 of the navigation information table storage unit 133, and sets the index value “0”. Button coordinates corresponding to the index value of “Focused Bitmap”, button coordinates corresponding to the index value “1”, and bitmap corresponding to the index value of “Normal Bitmap” Data is acquired, button graphics information is generated and output to the playback unit 128. The playback unit 128 causes the display unit 129 to display the display image 2301 illustrated in FIG. 27A by superimposing the graphics information output from the reception control unit 126 on the image data output from the AV decoder unit 124.

   When the display image 2301 is displayed and the user inputs a “down” signal using an operation member such as a remote controller, the reception control unit 126 first inputs the input signal “down” via the signal receiving unit 127. In response, the value of the variable cur_focus is increased by “1” to be “1”. Next, with reference to the navigation information table 1001 of the navigation information table storage unit 133, the display coordinates of the button corresponding to the index value “0”, the bitmap data corresponding to the index value of “Normal Bitmap”, and the index value “ Bit map data corresponding to the display coordinates of the button corresponding to “1” and the index value of “Focused Bitmap” is acquired, and the graphics information of the button is generated and output to the playback unit 128. The playback unit 128 causes the display unit 129 to display the display image 2302 illustrated in FIG. 27B by superimposing the graphics information output from the reception control unit 126 on the image data output from the AV decoder unit 124.

   When the display image 2301 is displayed and the user inputs a “determined” signal using an operation member such as a remote controller, the reception control unit 126 receives the input signal “determined” via the signal receiving unit 127. , The index value “0” of the handler of the button whose index value in the object definition table 1002 of the navigation information table 1001 of the navigation information table storage unit 133 is the value “0” of the variable cur_focus is acquired, and the handler definition Referring to table 1003, the script instruction word “goto_contents” corresponding to the index value “0” and the index value “0” of the argument are acquired.

  Next, the reception control unit 126 refers to the hyperlink table 1004, extracts the value “0x0001” of “VE_id” of the linked content corresponding to the index value “0”, and stores the stream correspondence table in the filter condition storage unit 131. The filter condition “table_id_extension” is set. Next, the reception control unit 126 acquires the PID value “0x0083” of the component attached to VE_Information_Component_Descriptor from the PMT 1501, and similarly sets it to “PID” in the filter condition of the stream correspondence table, and Set the filter condition to the start state.

  Next, the reception control unit 126 extracts the value “0x0001” of “NE_id” of the linked content corresponding to the index value “0”, and sets it to “table_id_extension” of the filter condition of the navigation information table in the filter condition storage unit 131. Set. Next, the reception control unit 126 acquires the PID value “0x0082” of the component attached to the NE_Component_Descriptor from the PMT 1501, and similarly sets it to “PID” in the filter condition of the navigation information table. Set the filter condition to the start state.

The TS decoder unit 123 separates the stream correspondence table 1202 shown in FIG. 15B, stores it in the stream correspondence information table storage unit 132, notifies the reception control unit 126, and separates the navigation information table 1101 shown in FIG. The information is stored in the navigation information table storage unit 133 and notified to the reception control unit 126.
Upon receiving the stream correspondence table separation notification from the TS decoder unit 123, the reception control unit 126 refers to the stream correspondence table 1202 and instructs the TS decoder unit 123 to separate the image data. When the navigation information table separation notification is received from the TS decoder unit 123, the navigation information table 1101 is referred to, button graphics information is generated and output to the reproduction unit 128.

  The playback unit 128 causes the display unit 129 to display the display image 2303 illustrated in FIG. 27C by superimposing the graphics information output from the reception control unit 126 on the image data output from the AV decoder unit 124. When the user inputs a “determined” signal using an operation member such as a remote controller while the display image 2301 is displayed, the reception control unit 126 receives the input signal “ In response to the notification “confirmed”, the navigation information table 1101 of the navigation information table storage unit 133 is referred to, and the script command word “goto_entry” is acquired. Next, the reception control unit 126 extracts the value “0x0005” of “entry_VE_id” from the PMT 1501 stored in the system information table storage unit 134 and “table_id_extension” of the filter condition of the stream correspondence table in the filter condition storage unit 131. Set.

Next, the reception control unit 126 acquires the PID value “0x0083” of the component attached to VE_Information_Component_Descriptor from the PMT 1501, similarly sets the filter condition “PID” of the stream correspondence table, and Set the filter condition to the start state.
The reception control unit 126 refers to the PMT 1501, extracts the value “0x0005” of “entry_NE_id”, and sets “table_id_extension” as the filter condition of the navigation information table in the filter condition storage unit 131. Next, the reception control unit 126 acquires the PID value “0x0082” of the component to which the NE_Component_Descriptor is assigned from the PMT 1501, similarly sets the filter condition “PID” of the navigation information table, and sets the navigation information response table. Set the filter condition to the start state.

The TS decoder unit 123 separates the stream correspondence table 1201 shown in FIG. 15A, stores it in the stream correspondence information table storage unit 132, notifies the reception control unit 126, and separates the navigation information table 1001 shown in FIG. The information is stored in the navigation information table storage unit 133 and notified to the reception control unit 126.
When receiving the stream correspondence table separation notification from the TS decoder unit 123, the reception control unit 126 refers to the stream correspondence table 1201 and instructs the TS decoder unit 123 to separate the image data. When the navigation information table separation notification is received from the TS decoder unit 123, the graphics information of the button is generated with reference to the navigation information table 1001 and output to the reproduction unit 128.

The playback unit 128 causes the display unit 129 to display the display image 2301 illustrated in FIG. 27A by superimposing the graphics information output from the reception control unit 126 on the image data output from the AV decoder unit 124.
1-3-11. Operation of Data Receiving Device 121 Hereinafter, the operation of the data receiving device 121 will be described with reference to the flowcharts shown in FIGS.

1-3-11-1. Overall Operation First, the overall operation of the data receiving apparatus 121 will be described with reference to FIG.
When the data receiving device 121 is turned on by the user, the reception control unit 126 controls the reception unit 122 and the TS decoder unit 123 according to a procedure defined by the MPEG2 system standard or the DVB-SI standard. The information table is received, the program table is displayed on the display unit 129 by the reproduction unit 128, and the user is allowed to select a program using an operation member such as a remote controller. When the selection signal from the operation member is notified via the signal reception unit 127, the transmission data stored in the transmission data storage unit 102 in the transport stream transmitted from the transmission unit 106 of the data transmission apparatus 101 is multiplexed. The event identifier, original_network_id, transport_stream_id, service_id, and event_id are obtained (S2402).

  When an event in which transmission data stored in the transmission data storage unit 102 is multiplexed is selected, the reception control unit 126 displays a system information table in accordance with procedures defined in the MPEG2 system standard and the DVB-SI standard. The reception unit 122 is instructed to receive the transport stream transmitted from the transmission unit 106, and the TS decoder unit 123 is instructed to separate the PMT corresponding to the selected event. The reception unit 122 receives the transport stream transmitted from the transmission unit 106 and outputs the transport stream to the TS decoder unit 123. The TS decoder unit 123 separates the PMT corresponding to the selected event, writes it in the system information table storage unit 134 in the reception data storage unit 125, and notifies the reception control unit 126. When receiving the notification of PMT reception from the TS decoder unit 123, the reception control unit 126 refers to the PMT in the system information table storage unit 134, acquires the PID of the PCR, and stores it in the filter condition storage unit 131 (S2404). ).

  The reception control unit 126 sets the original_network_id of the selected event in the variable cur_original_network_id, sets the selected transport_stream_id and the variable cur_transport_stream_id of the selected event in the variable cur_transport_stream_id, and sets the variable cur_transport_stream_id in the variable cur_transport_stream_id. The event_id of the selected event is set in the cur_VE_event_id and the variable cur_NE_event_id, and the variable cur_VE_id and the variable cur_NE_id are cleared. These variables indicate information on the identifier of the content currently being reproduced (S2406). Next, the reception control unit 126 sets the original_network_id of the selected event in the variable new_original_network_id, sets the selected new_transport_stream_id of the selected event in the variable new_transport_stream_id and the new_transport_stream_id_service_id_service variable. The event new_VE_event_id and the variable new_NE_event_id are set to the event_id of the selected event, the variables new_VE_id and the variable new_NE_id are referred to the PMT in the system information table storage unit 134, and the entry_VE_id and the entry_NE_i The values of the set, respectively (S2408).

Next, the reception control unit 126 performs content switching processing. Details of the content switching process will be described later (S2410).
Next, the reception control unit 126 clears a content change flag indicating that content switching is necessary to “0” (S2412).
Next, the reception control unit 126 waits for a selection operation signal input from the user notified from the signal reception unit 127 (S2414). When receiving a signal from the signal receiving unit 127, the reception control unit 126 processes the user input signal. Details of the processing of the user input signal will be described later (S2416). Next, the reception control unit 126 determines whether or not “1” is set in the content change flag (S2418). If “1” is set, the process returns to S2410, and if it is not “1”, the process returns to S2414. Return to.

1-3-11-2. Content Switching Processing Next, details of the content switching processing in S2410 will be described using the flowchart in FIG.
First, the reception control unit 126 has the same values of new_original_network_id and cur_original_network_id, which are variables stored in the reception control unit 126, and also determines whether the value of the variable new_transport_stream_id and the value of cur_transport_stream_id is 2 (S250 is the same or not). If the determination is affirmative, the image data switching process (S2504) and the navigation information switching process (S2506) are performed in parallel, and the process is terminated. When the result is negative, the process switches to the transport stream identified by the variable new_original_network_id and the variable new_transport_stream_id by referring to the system information table (S2508), and sets the variable cur_original_network_id to the variable new_network_id and the variable new_network_id. The variable cur_VE_service_id, the variable cur_VE_event_id, the variable cur_VE_id, the variable cur_NE_service_id, the variable cur_NE_event_id, and the variable cur_NE_id are cleared (S 510), and ends the switching processing of the image data and (S2504), the switching process (S2506) and is carried out for parallel processing of the navigation information.

1-3-11-3. Image Data Switching Processing Next, details of the image data switching processing in S2504 will be described with reference to the flowchart of FIG.
The reception control unit 126 determines whether or not the values of the variables new_VE_service_id and cur_VE_service_id stored therein are the same and the values of the variables new_VE_event_id and cur_VE_event_id are the same (S2602). When the result is affirmative, it is determined whether or not the values of the variables new_VE_id and cur_VE_id are the same (S2604). When the result is affirmative, the process ends. When the result is negative, the process proceeds to S2610. When the determination in S2602 is negative, the TS decoder unit 123 is instructed to separate the PMT corresponding to the event identified by the variable new_VE_service_id and the variable new_VE_event_id with reference to the system information table corresponding to the variables new_VE_service_id and new_VE_event_id. The TS decoder unit 123 separates the designated PMT, writes it to the system information table storage unit 134 in the reception data storage unit 125, and notifies the reception control unit 126. Upon receipt of the PMT separation notification, the reception control unit 126 refers to the received PMT, acquires the PID of the PCR, and sets it in the filter condition storage unit 131 (S2606). The reception control unit 126 sets the value of the variable new_VE_service_id to the variable cur_VE_id, and sets the value of the variable new_VE_event_id to the variable cur_VE_event_id (S2608).

  The reception control unit 126 refers to the PMT corresponding to the event identified by the variables cur_VE_service_id and cur_VE_event_id in the system information table storage unit 134, acquires the PID of the component attached to the VE_Information_Component_Descriptor, and uses the value of the variable new_te_ns as the value of the variable new_te_ns Set to the filter condition of the stream correspondence table, and set this filter condition to the start state. The TS decoder unit 123 separates the stream correspondence table VET corresponding to the value of the variable new_VE_id from the transport stream according to the filter condition, stores it in the stream correspondence information table storage unit 132, and notifies the reception control unit 126 (S2610). ).

  Next, the reception control unit 126 interprets the stream correspondence table VET acquired in S2610 in the stream correspondence information table storage unit 132, and sets the value of “first_pts” in the variable firstPTS and the value of “last_pts” in the variable lastPTS. , “Stream_id” and “component_tag” are acquired (S2612). Next, the reception control unit 126 initializes a flag “first_flag” indicating whether or not decoding of the first frame of the image data is completed to “0” (S2614).

  Next, the reception control unit 126 refers to the PMT corresponding to the event identified by the variables cur_VE_service_id and cur_VE_event_id in the system information table storage unit 134, the type of data to be transmitted is image data, and the value of “component_tag” is The PID of the component attached to the stream_identifier_descriptor equal to the value of “component_tag” acquired in S2612 is acquired, and set to the filter condition of the image data in the filter condition storage unit 131 together with the value of “stream_id” acquired in S2612. Set the filter condition to the start state. The TS decoder unit 123 separates the image data according to the filter condition, and outputs the image data to the AV decoder unit 124 (S2616).

The reception control unit 126 instructs the AV decoder unit 124 to acquire the value of the identifier of the image data described in the private area of the image data separated by the TS decoder unit 123, and compares it with the value of the variable new_VE_id (S2618). . If they match, the process moves to S2620, and if they do not match, the process moves to S2619.
The reception control unit 126 sets the filter condition of the image data in the filter condition storage unit 131 to the stop state (S2619), and returns to S2610.

When the AV decoder unit 124 completes decoding of the image data output from the TS decoder unit 123, the AV decoder unit 124 notifies the reception control unit 126 of the completion of decoding. The reception control unit 126 determines whether or not this completion notification has been received (S2620). If received, the process proceeds to S2622. If not received, the process proceeds to S2624.
The reception control unit 126 sets a value “1” to the flag first_flag (S2622).

   The reception control unit 126 obtains the current time in units of 1/9000 seconds by referring to the value of the clock unit of the AV decoder unit 124, and compares it with the value of the variable firstPTS (S2624). If the current time value is greater than or equal to the variable firstPTS, the process proceeds to S2626, and if it is less than that, the process proceeds to S2628. The reception control unit 126 determines whether or not the value of the flag first_flag is “1” (S2626). If it is “0”, the process proceeds to S2619, and if it is “1”, the process proceeds to S2628.

  In S2628, the reception control unit 126 obtains the current time in units of 1/9000 seconds by referring to the value of the clock unit of the AV decoder unit 124, and compares it with the value of the variable lastPTS. When the current time value is equal to or greater than the variable lastPTS, the filter condition of the image data in the filter condition storage unit 131 is set to the stop state (S2630), the value of the variable new_VE_id is set to the variable cur_VE_id (S2632), and the image data is set. When the current time value is less than the variable lastPTS, the process returns to S2620.

1-3-11-4. Navigation Information Switching Process Next, details of the navigation information switching process of S2506 will be described with reference to the flowchart of FIG.
The reception control unit 126 determines whether or not the values of the variables new_NE_service_id and cur_NE_service_id stored therein are the same and the values of the variables new_NE_event_id and cur_NE_event_id are the same (S2702). When the result is affirmative, it is determined whether or not the values of the variables new_NE_id and cur_NE_id are the same (S2704). When the result is affirmative, the process ends. When the result is negative, the process proceeds to S2706. If the determination in S2702 is negative, the system information table corresponding to the variables new_NE_service_id and new_NE_event_id is referred to, and the TS decoder unit 123 is instructed to separate the PMT corresponding to the event identified by the variable new_NE_service_id and the variable new_NE_event_id. The TS decoder unit 123 separates the designated PMT, records it in the system information table storage unit 134 in the reception data storage unit 125, and notifies the reception control unit 126 (S2708).

The reception control unit 126 sets the value of the variable new_NE_service_id to the variable cur_NE_service_id, and sets the value of the variable new_NE_event_id to the variable cur_NE_event_id (S2710).
In S2706, the reception control unit 126 refers to the PMT corresponding to the event identified by the variables cur_NE_service_id and cur_NE_event_id in the system information table storage unit 134, acquires the PID of the component attached to the NE_Component_Descriptor, and acquires the value of the variable new_NE_id. Is set as table_id_extension in the filter condition of the navigation information table of the filter condition storage unit 131, and this filter condition is set to the start state. The TS decoder unit 123 separates the navigation information table NVT corresponding to the value of the variable new_NE_id from the transport stream according to the filter condition, records it in the navigation information table storage unit 133, and notifies the reception control unit 126 (S2706). .

  The reception control unit 126 refers to the object definition table of the navigation information table NVT acquired in S2706 in the navigation information table storage unit 133, acquires the display coordinates “X” and “Y” of the button object, and subsequently “Normal”. Bitmap "index values are acquired, the bitmap table is referenced, bitmap data corresponding to the index values is acquired, button graphics information is generated based on these, and output to the playback unit 128. The reproducing unit 128 superimposes the graphics information on the image data decoded by the AV decoder unit 124 and displays the graphics information on the display unit 129 (S2712).

  The reception control unit 126 initializes a variable cur_focus indicating the index value of the currently selected button object to “0” (S2714). The reception control unit 126 refers to the object definition table of the navigation information table NVT acquired in S2706, acquires the display coordinates “X” and “Y” of the button object whose index value is equal to the value of the variable cur_focus, and then The index value of “Focused Bitmap” is acquired, the bitmap table is referenced, the bitmap data corresponding to the index value is acquired, and the bitmap of the button having the index value corresponding to the value of the variable cur_focus based on these is obtained. The graphics information of the button object, which is a selected bitmap, is generated and output to the playback unit 128. The playback unit 128 superimposes the graphics information on the image data decoded by the AV decoder unit 124 and displays the graphics information on the display unit 129 (S2716). The value of the variable new_NE_id is set in the variable cur_NE_id (S2718). The information switching process ends.

1-3-11-5. Processing of User Input Signal Next, the processing of the user input signal in S2416 will be described using the flowchart of FIG.
The reception control unit 126 determines whether or not the user input notified from the signal reception unit 127 is an “up” signal. If it is an “up” signal, the process proceeds to S2804; otherwise, the process proceeds to S2808 (S2802). In S2804, the reception control unit 126 decrements the value of the variable cur_focus by “1”. However, when the value of the variable cur_focus is “0”, it remains “0”.

  The reception control unit 126 refers to the object definition table of the navigation information table NVT acquired in S2706 stored in the navigation information table storage unit 133, and displays the display coordinates “X of the button object whose index value is equal to the value of the variable cur_focus. ”And“ Y ”, and then the index value of“ Focused Bitmap ”is acquired, the bitmap table is referred to, bitmap data corresponding to the index value is acquired, and based on these, the value of the variable cur_focus is set. A button object in which a bitmap of a button having a corresponding index value is set to a selected bitmap, and a bitmap of a button corresponding to an index value corresponding to the value of the variable cur_focus is changed to a bitmap in a normal state. And generating graphics information, and outputs it to the reproduction unit 128. The playback unit 128 superimposes the graphics information on the image data decoded by the AV decoder unit 124 and displays the graphics information on the display unit 129 (S2806), and ends the user input process.

  In step S <b> 2808, the reception control unit 126 determines whether the user input notified from the signal reception unit 127 is a “down” signal. If it is a “down” signal, the process proceeds to S2810. Otherwise, the process proceeds to S2812. In S2810, the reception control unit 126 increases the value of the variable cur_focus by “1”. However, if the value of the variable cur_focus is equal to the maximum value of the identifier of the button object in the navigation information table NVT, the process proceeds to S2806.

In S2812, the reception control unit 126 determines whether or not the user input notified from the signal reception unit 127 is a “confirmation” signal. If it is a “confirmed” signal, the process proceeds to S2814. Otherwise, the user input process is terminated.
In S2814, the reception control unit 126 refers to the object definition table of the navigation information table NVT, acquires the index value of the handler of the button object whose index value is equal to the value of the variable cur_focus, refers to the handler definition table, and sets the index. Read the instruction word from the handler corresponding to the value. If the instruction word is “goto_contents”, the process proceeds to S2818; otherwise, the process proceeds to S2824 (S2816).

In S2818, the reception control unit 126 reads the index value of the argument of the goto_contents instruction from the handler.
The reception control unit 126 refers to the hyperlink table of the navigation information table, and sets the original_network_id, transport_stream_id, VE_service_id, VE_event_id, VE_id, NE_service_id, and values of the content_ID corresponding to the index value read in S2818, The variables new_original_network_id, new_transport_stream_id, new_VE_service_id, new_VE_event_id, new_VE_id, new_NE_service_id, and new_NE_event_id are set to the variables new_original_network_id, new_transport_stream_id, new_VE_service_id, new_VE_event_id, new_VE_id, new_NE_service_id, new_NE_event_id, respectively. However, the value is not set in the hyperlink table, that is, for the identifier of “−”, the original value is not changed (S2820).

The reception control unit 126 sets the value of the content change flag to “1” (S2822), and ends the signal processing of the user.
In S2824, the reception control unit 126 determines whether or not the script command word is “goto_entry”, and if not, ends the user signal processing. In the case of “goto_entry”, the reception control unit 126 refers to the PMT corresponding to the event identified by the variables cur_NE_service_id and cur_NE_event_id in the system information table storage unit 134, and sets the values of “entry_VE_id” and “entry_NE_id” to the variables new_VE_id. The variable new_NE_id is set, the values of the variable cur_NE_service_id and the variable cur_event_id are respectively set in the variable new_VE_service_id and the variable new_VE_event_id (S2826), and the process proceeds to S2822.

As described above, the display image 2301 shown in FIG. 27A is switched to the display image 2303 shown in FIG. 27C and returned to the original state according to the user's operation.
1-3-12. Summary As described above, the data receiving apparatus 121 according to the present embodiment can extract presentation information and navigation information necessary for reproduction of specific content from a transport stream when necessary. As a result, it is possible to appropriately reproduce the linked content according to the user's operation, and it is possible to provide an interactive program according to the user operation using the one-way communication path. Become.

  Note that in the receiving apparatus 121 of the present embodiment, the receiving unit 122, the TS decoder unit 123, the AV decoder unit 124, the playback unit 128, the display unit 129, the audio output unit 130, and the signal receiving unit 127 are conventional digital television broadcasts. The same configuration as that of the receiving apparatus can be used. Therefore, the object of the present invention can be simply achieved by simply adding the above-described reception control unit 126, reception data storage unit 125, etc. to the reception unit, TS decoder unit, AV decoder unit, etc. that constitute the conventional digital broadcast receiver. The interactive function of the program can be realized.

In addition, since these conventional configurations can be used as they are, it is also possible to realize a receiving apparatus having both a normal digital satellite broadcast receiving function and an interactive function of a program targeted by the present invention.
1-3-13. Other 1-3-13-1.
Note that although an example in which all the image data is a still image is described in this embodiment, the receiving apparatus 121 can perform reproduction in the same manner as this embodiment even when the image data is a moving image. it can.

1-3-13-2.
Further, in the present embodiment, description has been made using an example in which each content is a set of image data and navigation information, but audio data may also be set. In this case, the reception control unit 126 may perform the audio data switching process in parallel with the image data switching process and output the audio data to the audio output unit 130. The audio data switching process can be realized by the same method as the image data switching process.

1-3-13-3.
Further, in the present embodiment, an example has been shown in which the script describing the behavior of the receiving device 121 included in the handler definition table in the navigation information is a simple one that only instructs content switching. It may be a complex script composed of a plurality of instruction words.

For example, when the program is “shopping information”, a script for calculating the total price of the product selected by the viewer may be described in the script.
This can be realized by providing the reception control unit 126 of the data receiving apparatus 121 with a script execution function. With this function, the total amount may be calculated, and the calculation result may be output to the playback unit 128 and displayed on the display unit 129.

Further, in this shopping, a script for ordering products may be described. For this purpose, this script is connected to the seller's computer system through, for example, a modem (not shown) of the receiving device 121 connected to the telephone line, and the data necessary for ordering the desired product is obtained. The content to be sent can be used. With this configuration, the user can actually place an order for a product while viewing the product information and confirming the total price of the product to be ordered.
(Embodiment 2)
2-1. FIG. 33 is a block diagram of Embodiment 2 of a data transmission device 3351 and a data reception device 3361 of the digital broadcasting system according to the present invention. Instead of the data transmission apparatus 101 according to the first embodiment multiplexing and transmitting the stream correspondence table for each image data, the data transmission apparatus 3351 according to the present embodiment uses a module information table for each of the plurality of image data. Is multiplexed and transmitted. This module information table is used in the data receiving device 3361 to extract one image data from the stream transmitted from the data transmitting device 3351. While the stream correspondence table of the first embodiment represents identification information of one image data, the module information table of the present embodiment represents identification information of a plurality of image data.

Due to these differences, the data transmission device 3351 has a data multiplexing unit 3352 having a module information generation unit 3353 replacing the stream correspondence information table generation unit 111 of the first embodiment and a multiplexing control unit 3354 replacing the multiplexing control unit 110. It has.
The data reception device 3361 includes a reception data storage unit 3363 having a module information storage unit 3364 instead of the stream correspondence information table storage unit 132 of the first embodiment, and replaces the reception control unit 126 with a reception control unit 3362. It has.

Hereinafter, parts having the same configurations as those of the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only constituent parts unique to the present embodiment will be described.
2-2. Data transmission device 3351
The data transmission device 3351 includes a transmission data storage unit 102, a data multiplexing unit 3352 including a module information generation unit 3353 and a multiplexing control unit 3354, a multiplexing information storage unit 104, a system information table generation unit 105, and a transmission unit. 106. Since the transmission data storage unit 102, the multiple information storage unit 104, the system information table generation unit 105, and the transmission unit 106 are the same as those in the first embodiment, description thereof will be omitted.

2-2-1. Data multiplexing unit 3352
The data multiplexing unit 3352 includes a multiplexing control unit 3354, a module information generation unit 3353, an identifier information addition unit 112, a navigation information table generation unit 113, and a multiplexing unit 114.
Since the identifier information adding unit 112, the navigation information table generating unit 113, and the multiplexing unit 114 are the same as those in the first embodiment, description thereof is omitted.

2-2-1-1. Multiplex control unit 3354 (part 1)
When activated by transmission section 106, multiplexing control section 3354 creates content identifier allocation table 701 and display image information identifier allocation table 801 according to the same procedure as multiplexing control section 110 of the first embodiment. When the creation is completed, the multiplex control unit 3354 instructs the module information generation unit 3353 to generate a module information table, instructs the identifier information addition unit 112 to add VE_id to the private area of the image data, and displays the navigation information table. The generation unit 113 is instructed to generate a navigation information table. 2-2-1-2. Module information generation unit 3353 Upon receiving an instruction to generate a module information table from the multiplexing control unit 3354, the module information generation unit 3353 refers to the display image information identifier allocation table 801 and generates a module information table for each U image data. create. U is the number of pieces of identification information of image data to be included in one module information table, and the value of U is obtained by the equation U = P × S / 2. Here, P and S represent the number of PIDs assigned for components that transmit image data and the number of stream_ids assigned to image data, as in the first embodiment. Here, U must be an integer. This can be easily realized by setting the value of P or S to an even number. In the present embodiment, as in the first embodiment, P = 1 and S = 16. Therefore, U = 8.

   The module information table is used in the data reception device 3361 to extract one image data from the stream transmitted from the data transmission device 3351. FIG. 34A, FIG. 34B, and FIG. 34C are diagrams each showing an example of a module information table when U = 8. The module information table “MIT (0)” 3451 represents the values of component_tag and stream_id assigned to the image data for each of the image data with the value of VE_id from “0” to “7”. The image data “VE (0)”, “VE (1)”, “VE (2)”, “VE (3)”, “VE (4)”, “VE (5)”, “VE (6” ) "Or" VE (7) ".

   The module information table can be created by the following procedure, for example. First, the module information generation unit 3353 sets the values of the variables i and n to 0, and determines whether or not the identifier information of U pieces of image data can be extracted from the nth image data in the display image information identifier assignment table 801. Check out. If it can be extracted, the values of VE_id, component_tag, and stream_id of the U image data are extracted and stored in a storage area (not shown) as a module information table “MIT (i)”. Next, “1” is added to the value of the variable i, and U is added to the value of the variable n. If the identifier information cannot be extracted, the creation of the module information table is terminated.

When the module information generation unit 3353 finishes creating the module information table, the module information generation unit 3353 notifies the multiplexing control unit 3354 to that effect.
2-2-1-3. Multiplex control unit 3354 (part 2)
Upon receiving notification from the identifier information adding unit 112, the navigation information table generating unit 113, and the module information generating unit 3353 that the respective processes have been completed, the multiplexing control unit 3354 determines the number of contents T in a repetition unit. The number of contents T in the repetition unit is a value satisfying M ≦ U × 2n = T, where M is the total number of contents stored in the transmission data storage unit 102. Here, n is the smallest integer that satisfies M ≦ T. In the present embodiment, T is 64 because M = 63 and U = 8. When the number of contents T in the repeat unit is larger than the total number M of contents, as in the first embodiment, the multiplexing control unit 110 multiplexes all the contents and then minimizes the minimum content (TM). Multiple null packets of a size equal to or larger than the number are multiplexed. Thereby, it can be ensured that the interval between the module information table and the image data whose identification information is indicated in the module information table is equal to or larger than a certain value (U times the minimum content size).

   Next, the multiplexing control unit 3354 refers to the multiplexing information storage unit 104 and notifies the multiplexing unit 114 of the PCR_PID. Next, the multiplexing control unit 3354 sets “0” to the content counter i and the multiplexing start position pointer wp, respectively. Next, the content number N and the module information table number Q are obtained. The content number N is the remainder (integer) of (i + U) ÷ T, and the module information number Q is the quotient (integer part) of i ÷ U. Next, it is determined whether or not the module information table MIT (Q) is stored in the module information generation unit 3353, and when it is stored, the multiplexing unit 114 is instructed to multiplex MIT (Q). At this time, the multiplexing start position wp and the bit rate B are notified, and the value of “VE_information_component_pid” in the multiplexing information table 601 is notified as the PID.

Upon receiving the MIT (N) multiplexing instruction, the multiplexing unit 114 multiplexes the transport stream using the designated multiplexing start position wp, bit rate B, and PID, as in the case of VET.
If the MIT (Q) is not stored in the module information generation unit 3353, the multiplexing control unit 3354 instructs the multiplexing unit 114 to multiplex null packets corresponding to the size of S_MIT, the multiplexing start position wp, the bit rate B To be notified. Here, S_MIT is the size when the MIT is converted into a transport packet. After instructing the multiplexing unit 114 to perform multiplexing, wp is calculated according to the equation wp = wp + S_MIT / B.

   Next, the multiplexing control unit 3354 determines whether VE (N) and NVT (N) are stored in the identifier information adding unit 112 or the navigation information table generating unit 113. If it is determined that they are stored, the multiplexing unit 114 is instructed to multiplex VE (N) and NVT (N) in the same manner as in the first embodiment, and the value of wp is calculated. If it is determined that it is not stored, the multiplexing unit 114 is instructed to multiplex null packets in the same manner as in the first embodiment, and wp is recalculated. The multiplexing control unit 3354 repeats the multiplexing instruction of VE (N) and NVT (N) while increasing the value of N by 1 until N becomes equal to i + U. When N = i + U, the multiplexing control unit 3354 adds U to the value of i, and then repeats the processing after the calculation of the content number N and the module information number Q. 2-2-1-4. Data Multiplexing Unit 114 FIG. 35 is a diagram illustrating an example of a transport stream generated by the multiplexing unit 114 in the present embodiment. In the transport stream 1701 of Embodiment 1, the stream correspondence table is multiplexed for each image data, whereas in the transport stream 3551 of this embodiment, the module information table is provided for every 8 image data. One is multiplexed. The module information table MIT (N) is multiplexed at a position preceding the image data VE (N × 8) corresponding to the module information table by 8 image data of the image data VE (N × 8 + 7). Further, another image data having the same PID and stream_id as the corresponding image data is not multiplexed between the module information table and the corresponding image data. Therefore, after receiving the module information table, the data receiving device 3361 separates only the first image data that is given the same PID and stream_id from the module information table, thereby obtaining desired image data VE (N). Can be extracted.

2-2-2. Operation of Data Transmission Device 3351 Next, the operation of the data transmission device 3351 of the present embodiment will be described using the flowcharts shown in FIGS.
First, the multiplexing control unit 3354 creates a content identifier allocation table 701 (S3602), then creates a display image information identifier allocation table 801 (S3604), an identifier information addition unit 112, a navigation information table creation unit 113, The module information generation unit 3353 is activated.

  The identifier information adding unit 112 adds and stores the image data identifier in the private area of the image data (S3606), and notifies the multiplexing control unit 3354 to that effect. The navigation information table generation unit 113 generates a navigation information table (S3608) and notifies the multiplex control unit 3354 to that effect. The module information generation unit generates a module information table (S3610) and notifies the multiplex control unit 3354 to that effect.

The system information table generation unit 105 generates various system information tables such as NIT, SDT, EIT, PAT, and PMT (S3612).
The multiplexing control unit 3354 determines the number T of repetition units when multiplexing the content to the transport stream (S3616), notifies the multiplexing unit 114 of the PCR_PID, and instructs PCR multiplexing (S3616). Next, “0” is set in each of the content counter i and the multiplexing start position wp (S3752).

Next, the multiplexing control unit 3354 obtains the content number N and the module information table number Q (S3754).
The multiplexing control unit 3354 determines whether or not the module information table MIT (Q) exists in the module information generation unit 3353 (S3756). If it exists, the multiplexing start position wp, bit rate B, and PID are notified to the multiplexing unit 114 to instruct multiplexing of the module information table MIT (Q) (S3758). If not, the multiplexing unit 114 is instructed to multiplex the null packet having the size of S_MIT (S3760).

Next, the multiplexing control unit 3354 calculates the multiplexing start position wp using the formula wp = wp + S_MIT / B (S3762), checks the identifier information adding unit 112 and the navigation information table generating unit 113, and whether content N exists. It is determined whether or not (S3764).
If it exists, the multiplexing unit 114 is instructed to multiplex the image data VE (N). At this time, the multiplex start position wp, bit rate Bv, PID, and stream_id are notified together (S3766). Further, it instructs the multiplexing unit 114 to multiplex the navigation information table NVT (N). At this time, the multiplexing start position wp, bit rate Bn, PID, and table_id_extension are also notified (S3768). Further, the multiplex start position wp is calculated using the formula wp = wp + {S_VE (N) + S_NVT (N)} / B (S3770), and the flow proceeds to S3776.

If the multiplexing control unit 3354 determines in S3764 that it does not exist, the multiplexing control unit 3354 instructs the multiplexing unit 114 to multiplex a null packet having a size of S_VE (0) + S_NVT (0) (S3772), and sets the multiplexing start position wp as an expression. Calculation is performed using wp = wp + {S_VE (0) + S_NVT (0)} / B (S3774), and the process proceeds to S3776.
In S3776, the multiplexing control unit 3354 adds “1” to the content number N. The multiplexing control unit 3354 determines whether or not the value of the content number N matches the sum of the value of the content counter i and the number U of identification information of the image data included in the module information table of 1 (S3778). If they match, the value of U is added to the value of i (S3780), and the process returns to S3754. If they do not match, the process returns to S3764.

2-3. Configuration of Data Receiving Device 3361 The data receiving device 3361 has a module information storage unit 3364 that stores a module information table separated by the TS decoder unit 123, instead of the stream correspondence information table storage unit 132 of the first embodiment. The configuration is almost the same as that of the data reception device 121 of the first embodiment except that a storage unit is provided and the function of the reception control unit 3362 is slightly different.

2-3-1. Image Data Switching Process The configuration of the data receiving device 3361 differs from the reception control unit 126 of the first embodiment only in the operation at the time of the image data switching process in S2504 of the content switching process shown in FIG. . Therefore, only the operation of the data receiving device 3361 during the image data switching process will be described with reference to the flowchart shown in FIG.

   When the switching of the image data is instructed, the reception control unit 3362 has the same values of the variables new_VE_service_id and cur_VE_service_id stored therein, and the variables new_VE_event_id and cur_VE_event_id, as in the first embodiment. It is determined whether or not the values are the same (S3852). When the result is affirmative, it is determined whether or not the values of the variables new_VE_id and cur_VE_id are the same (S3854). When the result is affirmative, the process ends. When the result is negative, the process proceeds to S3860. If the determination in S3852 is negative, the TS decoder unit 123 is instructed to separate the PMT corresponding to the event identified by the variable new_VE_service_id and the variable new_VE_event_id with reference to the system information table corresponding to the variables new_VE_service_id and new_VE_event_id. The TS decoder unit 123 separates the designated PMT, writes it in the system information table storage unit 134 in the reception data storage unit 125, and notifies the reception control unit 3362. Upon receipt of the PMT separation notification, the reception control unit 3362 acquires the PID of the PCR with reference to the received PMT and sets it in the filter condition storage unit 131 (S3856). The reception control unit 126 sets the value of the variable new_VE_service_id to the variable cur_VE_id, and sets the value of the variable new_VE_event_id to the variable cur_VE_event_id (S3858).

  The reception control unit 3362 refers to the PMT corresponding to the event identified by the variables cur_VE_service_id and cur_VE_event_id in the system information table storage unit 134, acquires the PID of the component attached to the VE_Information_Component_Descriptor, and stores the PID in the filter condition storage unit 131. Set the filter condition in the module information table, and set this filter condition to the start state. Here, the filter condition of the module information table is obtained by replacing the output destination of the filter condition of the stream correspondence table in the first embodiment with the module information storage unit 3364. The TS decoder unit 123 separates the module information table MIT from the transport stream according to the filter condition, stores it in the module information storage unit 3364, and notifies the reception control unit 3362 (S3860).

  Next, the reception control unit 3362 determines whether the module information in the module information storage unit 3364 includes image data identification information in which the value of VE_id is equal to the value of the variable new_VE_id (S3862). If not included, the process returns to S3860. If included, the reception control unit 3364 acquires the values of “stream_id” and “component_tag” of the image data from the module information table. Then, referring to the PMT corresponding to the event identified by the variables cur_VE_service_id and cur_VE_event_id in the system information table storage unit 134, the PID corresponding to the acquired “component_tag” value is obtained in the same manner as in the first embodiment. A value is acquired, the values of stream_id and PID are set as filter conditions for image data in the filter condition storage unit 131, and the filter conditions are set to a start state. The TS decoder unit 123 separates the image data for one frame in accordance with the filter condition, outputs the image data to the AV decoder unit 124, and notifies the reception control unit 3362. Receiving control unit 3362 receives the notification of separation of one frame, and sets the filter condition of the image data to the stopped state (S3864).

  The reception control unit 3362 instructs the AV decoder unit 124 to acquire the identifier value of the image data described in the private area of the image data separated by the TS decoder unit 123, and compares it with the value of the variable new_VE_id (S3866). . If they match, the process returns to S3868, and if they do not match, the process returns to S3860. The reception control unit 3362 instructs the AV decoder unit 124 to decode the separated image data. The AV decoder unit 124 decodes the image data separated by the TS decoder unit 123 and displays the decoded image data on the display unit 1298 via the reproduction unit 128 (S3868).

The reception control unit 3362 sets the value of the variable new_VE_id to the variable cur_VE_id (S3870), and ends the image data reproduction process.
2-4. Summary As described above, in this embodiment, a module information table in which a plurality of pieces of identification information of image data are described is multiplexed and transmitted for each of a plurality of image data. The data reception device 3361 can separate and reproduce desired image data according to the identification information of the image data in the module information table. Therefore, as in the case of the first embodiment, it is possible to provide an interactive program according to a user operation using a one-way communication path.

2-5. Other 2-5-1
In the present embodiment, only the component_tag and stream_id of each image data are included in the module information table. However, as with the stream correspondence table of the first embodiment, the start reproduction time information “first_pts” of each image data and , The end reproduction time information “last_pts” is included, and the reception control unit 3362 refers to the value of “first_pts” to re-acquire the acquisition when the setting of the filter condition of the image data is delayed. The decoding of the image data may be stopped with reference to the value of “last_pts”. 2-5-2 Further, in the present embodiment, description has been made using an example in which each content is a combination of image data and navigation information, but audio data may be further combined. When the audio data is included, the data transmission device 3351 multiplexes and transmits the module information table to the audio data as well as the image data, and the data reception device 3361 parallels the image data switching process. The audio data may be switched and output to the audio output unit 130. Audio data module information table multiplexing processing and audio data switching processing can be realized in the same manner as image data module information multiplexing processing and image data switching processing, respectively.

(Embodiment 3)
3-1. Outline of Configuration Embodiment 3 of the digital broadcast system according to the present invention has substantially the same configuration as the digital broadcast system of Embodiment 1 above, and therefore the configuration diagram of the digital broadcast system shown in FIG. 4 is used as it is. explain.

   The difference between the present embodiment and the first embodiment is attributed to the fact that audio data is stored in the presentation information storage unit 107 of the transmission data storage unit 102. Therefore, in the present embodiment, the content includes image data, audio data, and navigation information. Hereinafter, only the components unique to the present embodiment that are different from those of the first embodiment will be described.

3-2. Data transmission apparatus 101
3-2-1. Transmission data storage unit 102
3-2-1-1. Presentation information storage unit 107
In addition to the image data of the first embodiment, the presentation information storage unit 107 stores audio data that is reproduced together with the image data as BGM (background music), narration audio, or the like by the data reception device 121. ing. The audio data 2901 with the file name “BGM0.m2a”, the audio data 2902 with the file name “BGM1.m2a”, and the audio data 2903 with the file name “BGM2.m2a” shown in FIG. 39 are stored in the presentation storage unit 107. Are audio sources that are reproduced as BGM by the data receiver 121.

3-2-1-2. Structure information storage unit 109
The structure information storage unit 109 stores a structure information table 3001 and entry information 3002 shown in FIG. In the structure information table 3001, a content number 3003 is assigned to each content, and file names of image data 3004, audio data 3005, and navigation information 3006 are recorded corresponding to the content number. In addition to the structure information table 501 of the first embodiment, an item of audio data 3005 is added, and audio data to be reproduced simultaneously is specified for each content. For example, in the structure information table 3001, the audio data 2901 with the file name “BGM0.m2a” is reproduced for the content with the content number 1, and the audio data 2902 with the file name “BGM1.m2a” is reproduced with the content with the content number 5. It is specified.

3-2-2. Multiple information storage unit 104
The multiple information storage unit 104 stores a multiple information table 3101 shown in FIG. In this multiplex information table 3101, in addition to the multiplex information table 601 of the first embodiment, “AE_component_Bitrate0” 3102, “AE_component_pid0” 3103, “AE_component_Bitrate1” 3104, “AE_component_pid1” 3105, “AE_component3”, “AE_component3”, A value of “AE_component_pid2” 3107 is newly given. These values respectively indicate the transmission rate assigned when the audio data 2901, the audio data 2902, and the audio data 2903 are multiplexed on the MPEG2 transport stream, and the PID value.

3-2-3. Data multiplexing unit 103
3-2-3-1. Multiplex control unit 110
When the multiplex control unit 110 is activated by the transmission unit 106, the multiplex control unit 110 reads the structure information table 3001 and the multiplex information table 3101 described above, and assigns an image data identifier VE_id, navigation information identifier NE_id, etc. Create a table. FIG. 42 shows the content identifier assignment table 3201. The multiplex control unit 110 includes the AE_svc_id (voice data service identifier) 3202 and the AE_event_id (voice data event identifier) 3203 that are blank in the content identifier assignment table 701 in the first embodiment from the multiplex information table 3101, respectively. The values of “service_id” and “event_id” are read and written. Further, the multiplex control unit 110 writes the value of “AE_comp_tag (audio component tag)” 3204 instead of writing the value of “AE_id (audio data identifier)”. In “AE_comp_tag”, the component_tag value is assigned and written to the PID of the component that multiplexes the audio data assigned in the multiplex information table 3101 on a one-to-one basis. Here, for example, component_tag “0x00” is assigned to PID “0x0085”, and component_tag “0x01” is assigned to PID “0x0086”. The correspondence between the value of AE_comp_tag and the value of PID is given by PMT. Here, since AE_comp_tag 3204 is given instead of AE_id is background music or narration sound in which sound data 2901, sound data 2902, and sound data 2903 are continuously played back, one on one component. This is because they only multiplex. In the present embodiment, only component_tag is assigned to audio data of background music, but stream_id may be further assigned.

In the multiplex control unit 110, the same display image information identifier assignment table as the display image information identifier assignment table 801 of the first embodiment is created.
3-2-3-2. Navigation information table generation unit 113
When the navigation information table generation unit 113 receives an instruction to create a navigation information table from the multiplex control unit 110, the navigation information table generation unit 113 reads the navigation information (see FIG. 6) stored in the navigation information storage unit 108 and includes a hyperlink table. The content information assignment table 3201 is sometimes referred to to create a navigation information table. FIG. 43 shows the navigation information table 3301 of the generated file name “NVT (5)”. The difference from the navigation information table 1001 of the first embodiment is that the identifier of the audio data is changed to AE_id to become AE_comp_tag, and the multiplexing control unit 110 PID of the component that multiplexes the background music audio data here The value of component_tag assigned to is written.

3-2-3-3. Multiplexer 114
The multiplexing unit 114 multiplexes the stream correspondence table VET (N), the image data VE (N), and the navigation information table NE (N) in the transport stream as in the first embodiment. From multiplexing start position wp = 0, multiplexing audio data 2901 with PID “0x0085” given by bit rate “0.5 Mbps” given by “AE_component_Bitrate” and “AE_component_pid” in multiplexing information table 3101 is multiplexed. Instructed by the control unit 110. Similarly, it is also instructed to multiplex audio data 2902 with PID “0 × 0086” and audio data 2903 with PID “0 × 0087”. As shown in the transport stream 3501 of FIG. 44, the multiplexing unit 114 adds the stream 3502 of the audio data 2901, the stream 3503 of the audio data 2902, and the audio data 2903 in addition to the transport stream 1701 of the first embodiment. The stream 3504 is multiplexed.

3-2-4. System information table generation unit 105
The system information table generation unit 105 generates a system information table and a PMT as in the first embodiment. FIG. 45A shows the generated PMT 3401. The multiplexing control unit 110 refers to the multiplexing information table 3101 in addition to the PMT 1501 of the first embodiment, and PIDs “0 × 0085”, “0x0086”, “0x0087” of components for multiplexing the audio data 2901, A value “0x03” of “stream_type” indicating that the data multiplexed in this component is audio data, and a stream_identifier_descriptor indicating that the component_tag values of this component are “0x00”, “0x01”, and “0x02”, respectively. Furthermore, as shown in Entry_Descriptor 3402 of FIG. 45B, the identifier “entry_AE_comp_tag” of the audio data to be reproduced when the event is first selected is Describing the "0x01" Te.

3-2-5. Transmitter 106
FIG. 46 shows a transport stream 3601 transmitted from the transmission unit 106. In addition to the transport stream 1801 of the first embodiment, the audio data 2901 is the stream 3502 to which the PID “0x0085” is assigned, and the audio data 2902 is the stream 3503 to which the PID “0x0086” is assigned. 2903 is multiplexed as a stream 3504 to which PID “0x0087” is assigned.

3-2-6. Operation of Data Transmission Device 101 Next, the operation of the data transmission device 101 according to the present embodiment will be briefly described as a unique operation different from the first embodiment. After S1918 (FIG. 23) of the first embodiment, the multiplexing control unit 110 notifies the multiplexing unit 114 of the bit rate “0.5 Mbps”, the PID “0 × 0085”, and the multiplexing start position wp “0”. The multiplexing of the audio data 2901 is notified to the multiplexing unit 114 of the bit rate “0.5 Mbps”, the PID “0 × 0086”, and the multiplexing start position wp “0”. “0.5 Mbps”, PID “0 × 0087”, and multiplexing start position wp “0” are notified to the multiplexing unit 114, and multiplexing of the audio data 2903 is instructed to the multiplexing unit 114.

The multiplexing unit 114 multiplexes the transport stream according to the instruction from the multiplexing control unit 110.
3-3. Data receiving device 121
3-3-1. Reception control unit 126
When an event in which the transmission data stored in the transmission data storage unit 102 is multiplexed is selected from the transport stream 3601, the reception control unit 126 selects the image data of the entry content as in the case of the first embodiment. The navigation information table is acquired and reproduced, and the PMT 3401 in the system information table storage unit 134 is referred to, and a stream_identifier_descriptor having component_tag equal to the value “0x01” of “entry_AE_comp_tag” is attached, and the type of data to be transmitted is audio The PID value “0x0086” of the component having the value “0x03” representing the data is acquired. Then, the reception control unit 126 sets “0x0086” to the “PID” of the filter condition of the audio data in the filter condition storage unit 131, and sets the filter condition to the start state.

  As a result, the display screen 2301 shown in FIG. 27A is displayed on the display unit 129, and the audio data 2902 of the file name “BGM1.m2a” shown in FIG. 39 is reproduced as BGM from the audio output unit 130. Even when the user inputs an operation signal, the reception control unit 126 performs acquisition and reproduction processing of new image data and navigation information as well as the first embodiment, and performs voice processing from the hyperlink table of the navigation information table. By retrieving the data identifier and setting it in the filter condition storage unit 131, new audio data is acquired and reproduced. Thus, for example, in the state where the display screen 2301 shown in FIG. 27A is displayed on the display unit 129 and the audio data 2902 is output as BGM from the audio output unit 130, the button “Tokyo” is in the selected state. The weather forecast for is displayed. Here, when the user inputs the “confirm” key, the image data of the Tokyo weather forecast of VE_id “0 × 0001” is displayed in FIG. As shown, it is displayed on the display screen 2303. At the same time, according to the value “0x00” of “AE_comp_tag” of the audio data associated with the switching destination content specified in the hyperlink table 3302 of the navigation information table “NVT (5)” 3301 in FIG. The audio data 2901 having the file name “BGM0.m2a” shown is reproduced as BGM.

3-3-2. Operation of data receiving apparatus 121 3-3-2-1. Overall Operation Next, the operation unique to the present embodiment of the data receiving apparatus 121 will be described with reference to the flowchart of FIG.
Reception control unit 126 makes the same determination as in S2502 of the first embodiment (S3702), and when negative, performs the same processing as S2508 (S3704), and clears the value of variable cur_AE_comp_tag in addition to the processing of S2510. (S3706). Next, processing similar to the image data switching processing in S2504 (S3708), processing similar to the navigation information switching processing in S2506 (S3712), and audio data switching processing (S3710) are performed in parallel, and the processing is terminated. To do.

3-3-2-2. Audio Data Switching Processing Next, the audio data switching processing in S3710 will be described in detail with reference to the flowchart of FIG.
The reception control unit 126 determines whether or not the values of the variable new_AE_service_id and the variable cur_AE_service_id match, and the values of the variable new_AE_event_id and the variable cur_AE_event_id match (S3802). If the result is affirmative, it is determined whether or not the value of the variable new_AE_comp_tag matches the value of the variable cur_AE_comp_tag (S3804). If the determination is affirmative, the process ends. If the determination is negative, the process proceeds to S3810.

  When negative in S3802, the PMT of the event identified by the variable new_AE_service_id and the variable new_AE_event_id is acquired (S3806), the value of the variable new_AE_service_id is set to the variable cur_AE_service_id, and the value of the variable cur_AE_service_id_80 is set to the variable cur_AE_service_id To S3810.

  In S3810, the reception control unit 126 refers to the PMT of the event identified by the variable new_AE_service_id and the variable new_AE_event_id in the system information table storage unit 134, has component_tag equal to the value of the variable new_AE_comp_tag, and includes the data to be transmitted. The PID of the component whose type is audio data is acquired, set as the audio data filter condition in the filter condition storage unit 131, and set to the start state (S3810). Next, the value of the variable new_AE_comp_tag is set to the variable cur_AE_comp_tag (S3812), and the process ends.

3-3-3. Summary As described above, in the present embodiment, the data transmission apparatus 101 transmits audio data in association with image data and navigation information, and the data reception apparatus 121 separates image data and navigation information. In association with the display, the associated audio data is reproduced. Therefore, it is possible to reproduce BGM, narration voice, and the like in the interactive program shown in the first embodiment. Since audio data can be associated with each content, it can be switched to a different BGM or narration audio for each content. 4). Others Note that the data receiving apparatus 121 and the like of the first to third embodiments described above are stored in a recording medium such as a ROM card as a program that can exhibit the function of the reception control unit in the configuration diagram shown in FIG. By recording and inserting a ROM card into a card slot of a data receiving device that does not have these functions, a device similar to the data receiving device 121 according to the present invention can be obtained.

    (Summary) As described above, a digital broadcasting apparatus that realizes a pseudo dialogue using digital broadcasting includes an image information storage unit that stores a plurality of image data with image data identifiers, and the image Control information storage means for storing a plurality of control information with control information identifiers including link destination information indicating link destination image data and control information; and a plurality of the image data together with the control information Transmitting means for repeatedly transmitting.

  Further, a digital broadcast apparatus that realizes a pseudo dialogue using digital broadcast includes an image information storage unit that stores a plurality of image data with an image data identifier, and image data that is a link destination of the image data Control information storage means for storing a plurality of control information with control information identifiers including link destination information indicating control information and control information, and repeatedly transmitting the plurality of image data together with the control information as a multiplexed stream Multiplex transmission means is provided, so that the user can selectively change image data transmitted in one direction from the digital broadcasting device from any one image data to other image data according to the link destination information. Digital broadcasting can be used interactively.

  The digital broadcasting apparatus further includes correspondence information storage means for storing correspondence information that associates the image data with the control information, and the multiplexed transmission means is associated with the image data and the correspondence information. A reading unit that reads out the control information, and a multiplexing unit that sequentially multiplexes the image data and the control information read out by the reading unit, so that a plurality of image data and control information can be repeatedly transmitted. .

  In the digital broadcasting apparatus, since the link destination information is indicated by a set of an image data identifier of link destination image data and a control information identifier of control information, the link destination image data corresponds to this. Control information can be specified. In the digital broadcasting apparatus, the multiplexing unit allocates and writes the first image data identification information to the image data and the control information identification information to the control information when multiplexing the image data and the control information. Therefore, the desired image data and control information can be extracted from the respective identification information by the digital broadcast receiving apparatus.

  Further, in the digital broadcasting device, the control information includes auxiliary image information used for selection of link destination image data indicated in the link destination information. Can be easily. Further, in the digital broadcasting device, the control information includes script information for supporting the interactive function of the receiving device that receives the digital broadcast, so that the interactive operation in the digital broadcasting receiving device is further enhanced. It will be a thing.

  The digital broadcasting apparatus further includes entry information storage means for storing entry information indicating a set of image data and control information to be reproduced at the beginning of the program, and the multiplexed transmission means repeatedly transmits the entry information. Therefore, the image data to be reproduced at the beginning of the program and the corresponding control information are clarified, and the user's interactive operation on the digital broadcast receiving apparatus becomes easy.

  Further, a digital broadcast apparatus that realizes a pseudo dialogue using digital broadcast includes an image information storage unit that stores a plurality of image data with an image data identifier, and image data that is a link destination of the image data And control information, and a plurality of control information with control information identifiers including link destination information indicated by a combination of an image data identifier of link destination image data and a control information identifier of control information is stored. Control information storage means, correspondence information storage means for storing correspondence information for associating the image data with the control information, and multiplexing transmission means for repeatedly transmitting a plurality of the image data together with the control information as a multiplexed stream The multiplexed transmission means reads out the image data and the control information associated with the correspondence information, and the reading The image data and the control information read in the unit are sequentially multiplexed, and at this time, the first image data identification information is assigned to the image data, and the control information identification information is assigned to the control information and written therein, An image correspondence table generating unit that generates, for each image data, an image correspondence table that includes second image data identification information that specifies corresponding image data using a value equivalent to the image data identifier of the image data as its own identification information; The image data corresponding to the image correspondence table generated by the image correspondence table generator is transmitted before the predetermined time when the image data corresponding to the image correspondence table is transmitted from the multiplexed transmission means, that is, the digital broadcast receiving device that receives the digital broadcast specifies the image data. The image correspondence table is read so that the second image data identification information to be transmitted is transmitted before a time sufficient to start extraction of the image data. Since then and an image correspondence table multiplexing unit for multiplexing, with reference to the image correspondence table in the digital broadcast receiving apparatus can extract reliably image data. Further, the first and second image data identification information can be reused, and when a small amount of identification information is used effectively and there is a large amount of image data, the image data and the image data can be used even if the same identification information is attached to the image data. Correspondence with the correspondence table can be ensured.

  In the digital broadcast apparatus, the multiplexing transmission means further multiplexes the image correspondence table into the multiplexed stream by the image correspondence table multiplexing unit, and then the multiplexing unit outputs the image data corresponding to the image correspondence table. Controls the reading unit to read at least one image data having first image data identification information different from the image data specified by the second image data identification information included in the image correspondence table before multiplexing. Therefore, the image data can be transmitted efficiently.

  In the digital broadcasting device, the multiplexing unit further generates empty data until the predetermined number is reached when the number of image data stored in the image information storage means is less than the predetermined number. Since the multiplexing unit is configured to sequentially multiplex the empty data generated by the empty data generation unit following the last image data and control information read by the reading unit, It can be ensured that the transmission time interval between the image data and the corresponding image correspondence table is a certain value or more. Thus, desired image data can be reliably extracted by the digital broadcast receiving apparatus.

  In the digital broadcasting device, the multiplexing unit may set a bit rate corresponding to a ratio between a data amount of each image data and an information amount of the corresponding control information when multiplexing the image data and the control information. A bandwidth allocation unit that allocates each control information corresponding to the data, and the multiplexing unit is configured to multiplex the image data and the control information at each allocated bit rate, so that the control information corresponding to the image data Can be extracted almost simultaneously in the digital broadcast receiver.

  In the digital broadcasting device, the multiplexing unit further includes a multiplexing start position calculation unit that calculates each multiplexing start position for multiplexing the image correspondence table, the image data, and the control information according to a predetermined calculation formula. The image correspondence table multiplexing unit multiplexes the image correspondence table from the multiplex start position of the image correspondence table calculated by the multiplex start position calculation unit, and the multiplexing unit calculates the image calculated by the multiplex start position calculation unit. Since the image data and the control information are multiplexed from the multiplexing start position of the data and the control information, the multiplexing start position of each image correspondence table, each image data, and each control information on the multiplexed stream is clear. become.

  In the digital broadcasting apparatus, the first image data identification information and the second image data identification information are the same. Further, in the digital broadcasting apparatus, the first image data identification information and the second image data identification information are a combination of a stream identifier (stream_id) and a packet identifier (PID) defined in the MPEG2 (Moving Picture Experts Group 2) standard. Therefore, the digital broadcast receiving apparatus can extract image data without referring to the correspondence table.

  In the digital broadcasting device, the first image data identification information is a combination of a stream identifier (stream_id) and a packet identifier (PID) defined in the MPEG2 (Moving Picture Experts Group 2) standard, and the second image data The identification information is a combination of a stream identifier defined in the MPEG2 standard and a component tag (component_tag) defined in the DVB (Digital Video Broadcasting) standard, and the multiplexed transmission means corresponds to the packet identifier and the component tag. Since the table is repeatedly transmitted, the image data can be indirectly specified with reference to the image correspondence table, and even when the packet identifier assigned to the image data is changed in the digital broadcasting system, In the broadcast receiving device, The first image data identification information can be easily obtained with reference to the correspondence table, and the image data can be reliably extracted.

In the digital broadcasting apparatus, the multiplexed transmission means further includes an image data identifier adding unit that adds an image data identifier to a private area of the image data when the image data read by the reading unit is multiplexed. Therefore, it can be determined whether or not the desired image data can be accurately extracted by the digital broadcast receiving apparatus.
In the digital broadcasting device, the image correspondence table multiplexing unit further includes the same image after multiplexing one image correspondence table until the image data corresponding to the image correspondence table is multiplexed. Since the correspondence table is read and multiplexed a plurality of times, the digital broadcast receiving apparatus can reproduce image data at high speed when the load is light.

  Further, a digital broadcasting apparatus that realizes a pseudo dialogue using digital broadcasting includes an image information storage unit that stores a plurality of image data with an image data identifier, and a plurality of audio data identifiers. Audio information storage means for storing audio data, and a plurality of control information to which control information identifiers including link destination information indicating link image data, audio data, and control information of the image data are stored. Control information storage means and multiplexed transmission means for repeatedly transmitting a plurality of the image data and audio data together with the control information as a multiplexed stream. It can be a target of interactive operation on the receiving device.

  The digital broadcasting device further includes correspondence information storage means for storing correspondence information that associates the image data, the audio data, and the control information, and the multiplexed transmission means includes the image data and the correspondence information. A reading unit that reads a plurality of audio data and control information associated with each other, and a multiplexing unit that sequentially multiplexes the image data, audio data, and control information read by the reading unit, A plurality of audio data can be repeatedly transmitted together with image data and control information.

  In the digital broadcasting device, the link destination information is indicated by a set of an image data identifier of link destination image data, an audio data identifier of link destination audio data, and a control information identifier of control information. It is possible to specify link destination voice data and control information corresponding to the voice data. In the digital broadcasting device, the multiplexing unit may include the first image data identification information for the image data, the first audio data identification information for the audio data, when the image data and the control information are multiplexed. Since control information identification information is allocated and written in the control information, desired audio data can be extracted from the identification information in the digital broadcast receiving apparatus.

  Further, in the digital broadcasting device, the multiplexed transmission means further uses an image data identifier that is equivalent to the image data identifier of the image data as its own identification information, and includes an image including second image data identification information that identifies the corresponding image data. An image correspondence table generating unit that generates a data correspondence table for each image data, and second audio data identification information for specifying corresponding audio data using a value equivalent to the audio data identifier of the audio data as its own identification information A sound correspondence table generating unit that generates a sound data correspondence table including each of the sound data, and image data corresponding to the image correspondence table generated by the image correspondence table generation unit is transmitted from the multiplexed transmission unit. Before the time, that is, the digital broadcast receiving device that receives the digital broadcast acquires the second image data identification information for specifying the image data, and An image correspondence table multiplexing unit that reads out and multiplexes the image correspondence table so that it is transmitted before a time sufficient to start data extraction, and the voice correspondence generated by the voice correspondence table generation unit A predetermined time before the audio data corresponding to the table is transmitted from the multiplexed transmission means, that is, the digital broadcast receiving device that receives the digital broadcast acquires second audio data identification information that specifies the audio data, and In the digital broadcast receiving apparatus, since it has a voice correspondence table multiplexing unit that reads and multiplexes the voice correspondence table so that it is transmitted before a sufficient time required to start extraction of voice data, With reference to the image correspondence table and the sound correspondence table, it is possible to reliably extract the image data and the sound data.

  Further, a digital broadcast apparatus that realizes a pseudo dialogue using digital broadcast includes an image information storage unit that stores a plurality of image data with an image data identifier, and image data that is a link destination of the image data And control information, and a plurality of control information with control information identifiers including link destination information indicated by a combination of an image data identifier of link destination image data and a control information identifier of control information is stored. Control information storage means, correspondence information storage means for storing correspondence information for associating the image data with the control information, and multiplexing transmission means for repeatedly transmitting a plurality of the image data together with the control information as a multiplexed stream The multiplexed transmission means reads a plurality of the image data and the control information associated with the image data and the correspondence information; A multiplexing unit that sequentially multiplexes image data and control information read by the reading unit, and assigns and writes first image data identification information to the image data and control information identification information to the control information, An image correspondence table including second image data identification information for specifying the corresponding image data using a value equivalent to the image data identifier of the image data as its own identification information, in which reproduction time information of the corresponding image data is written An image correspondence table generating unit generated for each image data, and a predetermined time before the image data corresponding to the image correspondence table generated by the image correspondence table generating unit is transmitted from the multiplexed transmission means, that is, digital broadcasting It is necessary for the digital broadcast receiving apparatus that receives the image data to acquire the second image data identification information for specifying the image data and to start extracting the image data Since it includes an image correspondence table multiplexing unit that reads and multiplexes the image correspondence table so that the image correspondence table is transmitted before a predetermined time, the digital broadcast receiving apparatus can know time information to be reproduced of the image data. it can.

  In the digital broadcasting device, the image correspondence table generating unit includes a reproduction time calculating unit that calculates time information at which image data corresponding to the image correspondence table is reproduced according to a predetermined calculation formula, and the reproduction time calculating unit. Since the playback time writing unit for writing the calculated playback time information in the image correspondence table is provided, the digital broadcast receiving apparatus can accurately extract the image data and manage the playback time.

  Further, a digital broadcast apparatus that realizes a pseudo dialogue using digital broadcast includes an image information storage unit that stores a plurality of image data with an image data identifier, and image data that is a link destination of the image data And control information, and a plurality of control information with control information identifiers including link destination information indicated by a combination of an image data identifier of link destination image data and a control information identifier of control information is stored. Control information storage means, correspondence information storage means for storing correspondence information for associating the image data with the control information, and multiplexing transmission means for repeatedly transmitting a plurality of the image data together with the control information as a multiplexed stream The multiplexed transmission means reads a plurality of the image data and the control information associated with the image data and the correspondence information; A multiplexing unit that sequentially multiplexes the image data and the control information read by the reading unit, and assigns and writes the first image data identification information to the image data and the control information identification information to the control information, A module information generation unit that generates module information including second image data identification information for identifying each of the plurality of image data for each of the plurality of image data, and a second module information generated by the module information generation unit. A predetermined time before the image data group specified by the image data identification information is transmitted, that is, the digital broadcast receiving device that receives the digital broadcast acquires the second image data identification information that specifies the image data, and the image A module that reads and multiplexes the module information so that it is transmitted before a sufficient time is required to start data extraction. Since an Lumpur information multiplexing unit, in the digital broadcast receiving apparatus, by referring to the module information can be extracted reliably image data.

  Further, the digital broadcast receiving apparatus receives a digital broadcast in which a plurality of image data and control information associated with each image data are repeatedly transmitted, and each of the control information is linked to the corresponding image data. Link destination information indicating image data of other link destinations to which is attached is included, and the digital broadcast receiving apparatus receives a digital broadcast including the following: one image data from the received digital broadcast; Extraction means for extracting control information corresponding thereto, storage means for storing the extracted control information, reproduction means for reproducing the extracted image data, and link destination information included in the control information The operation means for accepting the selected user's selection operation, and the control information corresponding to the image data specified by the link destination information in accordance with the user operation. Extraction control means for controlling the output means, so that the user can selectively select image data transmitted in one direction from the digital broadcasting apparatus from any one of the image data according to the link destination information included in the control information. It is possible to change to the image data, and digital broadcasting can be used interactively.

  In the digital broadcast receiving apparatus, the image data is attached with first image data identification information, the control information is attached with control information identification information, and the control information is an image for identifying link destination image data. A data identifier and a control information identifier for identifying link destination control information are described as link destination information, and the operation means designates switching from image data reproduced by the reproduction means to link destination image data. The extraction control means reads the link destination information of the control information stored in the storage means, and the image of the link destination image data designated to be switched by the designation reception section. Based on the data identifier and the control information identifier of the control information, an extraction condition is set for the extraction means, and the extraction means is set by the extraction control means. Since the extracting image data and control information by extracting conditions, by switching designation of the image data of the user, the corresponding control information is extracted and the desired image data transmitted from the digital broadcasting apparatus.

  In the digital broadcast receiving apparatus, a plurality of the image data and the control information corresponding to the plurality of image data are transmitted as multiplexed multiplexed streams, and the reproduction unit stores the control information stored in the storage unit The auxiliary image reproduction unit that reproduces the auxiliary image information including the auxiliary image used for selection from the image data to the linked image data to be reproduced on the image data. The user can easily switch the display to the linked image data using the auxiliary image while viewing the displayed display image.

  In the digital broadcast receiving apparatus, the control information corresponding to a plurality of the image data is transmitted as a multiplexed stream, and the control information includes a script for supporting an interactive function. Script information is included, and the playback means further includes a script information interpretation unit that interprets the script information, and a script execution unit that executes each script according to the interpretation of the script information interpretation unit. By executing the above, the user's interactive operation can be further enhanced.

  In the digital broadcast receiving apparatus, a plurality of the image data and the control information corresponding to the plurality of image data are transmitted as a multiplexed stream, and reproduction of the multiplexed stream is started in the multiplexed stream. Sometimes entry information describing the control information identifier of the control information corresponding to the image data identifier of the image data to be reproduced first is multiplexed, and the extraction control means is multiplexed by the user in the operation means. When an operation for selecting a stream is received, extraction of entry information is instructed. In addition, the extraction unit includes an entry information extraction unit that extracts entry information in response to an instruction from the extraction control unit, and the storage unit stores entry information extracted by the entry information extraction unit. A storage unit, and the extraction control unit sets an extraction condition in the extraction unit based on an image data identifier described in entry information and a control information identifier, so that reproduction of a multiplexed stream is started. In this case, the control information corresponding to the image data to be reproduced first becomes clear.

  Further, the digital broadcast receiving apparatus receives a digital broadcast in which a plurality of image data and control information associated with each image data are repeatedly transmitted, and each of the control information is linked to the corresponding image data. The link destination information indicating the image data of the other link destination to which the link is attached is included, and the image data identifier for identifying the image data of the link destination and the control information identifier for identifying the control information of the link destination are described as the link destination information. First image data identification information is attached to the image data, control information identification information is attached to the control information, and a plurality of the image data and the control information corresponding thereto Is transmitted as a multiplexed stream, and a value equivalent to the image data identifier of the corresponding image data is set in the multiplexed stream. The image correspondence table in which the second image data identification information of the corresponding image data is described is multiplexed, and this image correspondence table is repeatedly transmitted in the same manner as the image data, and receives the digital broadcast. Receiving means; and extracting means for extracting one image data and control information corresponding to the image data from the received digital broadcast. The extracting means is provided with image correspondence table identification information that matches a set extraction condition. An image correspondence table extracting unit for extracting the extracted image correspondence table from the multiplexed stream, and storing means for storing the extracted control information, wherein the storage means stores the extracted image correspondence table. A reproduction unit that has a correspondence table storage unit and reproduces the extracted image data; and an operation unit that accepts a user's selection operation for link destination information included in the control information. The operation means has a designation accepting section for accepting an operation for designating switching from the image data reproduced by the reproduction means to the image data of the link destination, and the image data designated by the link destination information in accordance with the user operation And the control information corresponding to the link information is read out, the link destination information of the control information stored in the storage means is read, and the image data of the link destination image data designated by the designation accepting unit An extraction control unit configured to set an extraction condition in the extraction unit based on an identifier and a control information identifier of the control information, and the extraction unit extracts image data and control information according to the extraction condition set by the extraction unit; The extraction control means sets the image correspondence table identification information having a value equivalent to the image data identifier of the link destination image data as an extraction condition. A condition setting unit is provided.

  Further, the extraction control means further reads second image data identification information described in an image correspondence table stored in the image correspondence table storage unit, and uses the read second image data identification information to perform the extraction. An image data extraction control unit that sets an extraction condition in the means, and the extraction unit further includes an image data extraction unit that extracts image data that matches the extraction condition set by the image data extraction control unit. Therefore, the image data can be extracted by referring to the image correspondence table to extract the image data, obtaining the second image data identification information for extracting the image data indirectly.

  In the digital broadcast receiving apparatus, the same first image data identification information is repeatedly added to different image data in the image data, and the reproduction means adds the image data extracted by the image data extraction unit to the image data. The image data identifier includes an identifier extraction unit that extracts an image data identifier recorded in a private area of the image data, and the extraction control unit further reads out the image data identifier extracted by the identifier extraction unit. When it is determined that the image data determination unit that determines whether or not the image data identifier of the link destination image data in the link destination information matches the image data determination unit, the playback unit is instructed to stop playback. And a playback stop instruction unit for stopping playback by the playback means, and when the playback stop instruction unit gives a playback stop instruction, Since the image correspondence table extraction unit includes an image correspondence table extraction instruction unit for instructing the extraction of the image correspondence table, the desired image data can be obtained even if the same first image data identification information is attached to different image data. Desired image data can be appropriately extracted when other than the above are extracted.

  Further, in the digital broadcast receiving apparatus, the extraction control unit includes an extraction stop instruction unit that instructs the image data extraction unit to stop extracting image data when it is determined that the image data determination unit matches. After extracting desired image data, it is possible to prevent further different image data from being extracted. In the digital broadcast receiving apparatus, the image correspondence table includes a start reproduction time of the corresponding image data, and the reproduction unit further includes a clock unit for counting the time, and the reproduction unit extracts When the decoded image data is decoded and reproduced, and decoding of one image data is completed, the extraction control means is notified of the completion of decoding, and the extraction control means is further described in the image correspondence table. A start time determination unit that determines whether or not there is a notification of completion of decoding from the playback unit by the start playback time of the existing image data, and when it is determined that there is no start time determination unit, the image data extraction unit Since an extraction instruction unit for instructing to stop data extraction and for instructing the image correspondence table extraction unit to extract the image correspondence table is provided, the reproduction of the image data is performed halfway. Raw can be prevented.

  In the digital broadcast receiving apparatus, the first image is a stream identifier (stream_id) and a packet identifier (PID) defined in the MPEG2 standard, and the second image data identification information is defined in the MPEG2 standard. A stream identifier and a component tag (component_tag) defined in the DVB standard. A correspondence table of component tags and packet identifiers is multiplexed and repeatedly transmitted in the multiplexed stream. The correspondence table is extracted, and the image data extraction control unit converts the second image data identification information into the first image identification information with reference to the correspondence table, and sets the extraction condition in the image data extraction unit. Therefore, images multiplexed in a multiplexed stream in accordance with the MPEG2 standard It is possible to reliably extract over data.

  In the digital broadcast receiving apparatus, the control information identification information is a table identifier extension (table_id_extension) having the same value as the control information identifier defined in the MPEG2 standard. can do. In the digital broadcast receiving apparatus, the first image data identification information and the second image data identification information are the same, and the image data extraction control unit sends the read second image data identification information to the extraction unit. Since the extraction condition is set, desired image data can be extracted by setting the second image data identification information described in the image correspondence table as the extraction condition as it is.

  Further, in the digital broadcast receiving apparatus, the image correspondence table describes an end reproduction time of the corresponding image data, the reproduction means further includes a clock unit for counting the time, and the extraction control means An end time determination unit that determines whether or not the end reproduction time of the image data described in the image correspondence table has been reached, and when the end time determination unit determines that the end reproduction time of the image data has been reached Since the image data extraction unit is provided with an extraction stop instruction unit that instructs the image data extraction unit to stop extracting, it is possible to prevent image data from being extracted after the time to be reproduced has elapsed.

  Further, the digital broadcast receiving apparatus receives a digital broadcast in which a plurality of image data and control information associated with each image data are repeatedly transmitted, and each of the control information is linked to the corresponding image data. Link destination information indicating image data of other link destinations to which is attached is included, first image data identification information is attached to the image data, and control information identification information is attached to the control information. In addition, an image data identifier that identifies link destination image data and a control information identifier that identifies link destination control information are described as link destination information, and a plurality of the image data and the control information corresponding thereto Is transmitted as a multiplexed stream, and a value equivalent to the image data identifier of the corresponding image data is set in the multiplexed stream. The image correspondence table in which the second image data identification information of the corresponding image data and the end reproduction time of the corresponding image data are described is multiplexed, and this image correspondence table is repeated in the same manner as the image data. A receiving means for receiving the digital broadcast, and an extracting means for extracting one image data and corresponding control information from the received digital broadcast, wherein the extracting means includes a set extraction condition. An image correspondence table extracting unit that extracts from the multiplexed stream an image correspondence table with image correspondence table identification information that matches the image, and extracts image data that matches the set extraction condition from the multiplexed stream A data extraction unit; and a storage unit that stores the extracted control information. The storage unit includes an image correspondence table storage unit that stores the extracted image correspondence table. Replay means for replaying image data, the replay means having a clock unit for counting time, and comprising operation means for accepting a user's selection operation for link destination information included in the control information, The operation means includes a designation receiving unit that accepts an operation for designating switching from the image data reproduced by the reproduction means to the image data of the link destination, and the image data specified by the link destination information in accordance with the user operation Controls the extraction means to extract the corresponding control information, reads the link destination information of the control information stored in the storage means, and the image data identifier of the link destination image data designated to be switched by the designation receiving unit And an extraction control means for setting an extraction condition in the extraction means based on the control information identifier of the control information, and the extraction control means An extraction condition setting unit for setting image correspondence table identification information having a value equivalent to the image data identifier of the data as an extraction condition, and whether or not the end reproduction time of the image data described in the image correspondence table has been reached. An end time determination unit for determining, and after the extraction condition is set by the extraction condition setting unit, until the end time determination unit determines that the end reproduction time of the image data has been reached, the image data extraction unit And an extraction state control unit that controls to extract image data that matches the extraction condition set from the multiplexed stream. The extracted image data can be prevented.

  A digital broadcast receiving apparatus that receives a digital broadcast in which a plurality of image data, a plurality of sound data, each image data, and control information associated with each sound data is repeatedly transmitted, the control information Includes link destination information indicating other link destination image data and audio data linked to the corresponding image data, receiving means for receiving the digital broadcast, and from the received digital broadcast Extraction means for extracting one image data and sound data and control information corresponding thereto, storage means for storing the extracted control information, reproduction means for reproducing the extracted image data and sound data, An operation means for accepting a user's selection operation for the link destination information included in the control information, and an image specified by the link destination information in accordance with the user operation Is provided with the extraction control means for controlling the extracting means to extract the control information corresponding to over data and audio data, in addition to image data, audio data also may be subject to interaction.

  Further, the digital broadcast receiving apparatus receives a digital broadcast in which a plurality of image data and control information associated with each image data are repeatedly transmitted, and each of the control information is linked to the corresponding image data. Link destination information indicating image data of other link destinations to which is attached is included, first image data identification information is attached to the image data, and control information identification information is attached to the control information. In addition, an image data identifier that identifies link destination image data and a control information identifier that identifies link destination control information are described as link destination information, and a plurality of the image data and the control information corresponding thereto Is transmitted as a multiplexed stream, and in the multiplexed stream, a duplicate describing the correspondence between a plurality of image data identifiers and second image data identification information is described. Module information is multiplexed, and includes: a receiving unit that receives a digital broadcast; and an extracting unit that extracts one image data from the received digital broadcast and control information corresponding thereto. When module information extraction conditions are set, a module information extraction unit for extracting module information is provided, and storage means for storing the extracted control information is provided. The storage means stores the extracted module information. A module having a module information storage unit; and a reproducing unit that reproduces the extracted image data; and an operation unit that receives a user's selection operation for link destination information included in the control information. A designation receiving unit for accepting a switching designation operation from the image data reproduced by the reproduction means to the linked image data; Accordingly, the extraction means is controlled to extract the image data designated by the link destination information and the corresponding control information, the link destination information of the control information stored in the storage means is read, and the designation receiving unit Extraction control means for setting an extraction condition in the extraction means based on the image data identifier of the link destination image data designated for switching and the control information identifier of the control information, the extraction control means comprising the module information storage An image data identifier determination unit that determines whether or not an image data identifier that matches an image data identifier of link destination image data read from the link destination information is described in the module information stored in the unit; When the data identifier determination unit determines that the matching image data identifier is described, the corresponding second image data identification information Is read from the module information, and the second image data identification information is used to describe an image data identifier that matches the image data extraction control unit that sets the extraction condition of the image data in the extraction unit and the image data identifier determination unit. A module information re-extraction instruction unit that instructs the module information extraction unit to extract new module information when it is determined that the module information extraction unit is instructed by the module information re-extraction instruction unit. The module information is newly extracted, the module information stored in the module information storage unit is updated, and the image data identifier determination unit performs the determination on the updated module information. Therefore, image data can be extracted with reference to module information.

  A digital broadcasting system that realizes a pseudo dialogue using digital broadcasting includes the following digital broadcasting device and digital receiving device, and the digital broadcasting device receives a plurality of image data with an image data identifier attached thereto. Stored image information storage means, and control information storage means for storing a plurality of control information with control information identifiers including link destination information indicating image data linked to the image data and control information And transmission means for repeatedly transmitting a plurality of the image data together with the control information, and each control information includes a link destination indicating the image data of another link destination linked to the corresponding image data. The digital broadcast receiving apparatus includes a receiving means for receiving the digital broadcast, one image data from the received digital broadcast, and Extraction means for extracting the corresponding control information, storage means for storing the extracted control information, reproduction means for reproducing the extracted image data, and a user for the link destination information included in the control information And an extraction control means for controlling the extraction means so as to extract the image data specified by the link destination information and the control information corresponding to the user operation.

  Furthermore, a digital broadcasting system that realizes a pseudo dialogue using digital broadcasting includes the following digital broadcasting device and digital receiving device, and the digital broadcasting device receives a plurality of image data with image data identifiers attached thereto. A control information identifier including link destination information indicating a stored image information storage means, a link destination of the image data, and a combination of an image data identifier of the link destination image data and a control information identifier of the control information; Control information storage means for storing a plurality of attached control information, correspondence information storage means for storing correspondence information for associating the image data with the control information, and the image data and the correspondence information. Control information associated with the image data, and repeatedly transmits the read image data together with the control information as a multiplexed stream. Multiplex transmission means for allocating and writing image data identification information to image data and control information identification information to control information when multiplexing with control information, and the digital broadcast receiving device Receiving means for receiving, extracting means for extracting one image data and corresponding control information from the received digital broadcast, storage means for storing the extracted control information, and reproducing the extracted image data Playback means, operation means for accepting a user's selection operation for link destination information included in the control information, control information corresponding to image data specified by link destination information selected in accordance with the user operation, Extraction control means for controlling the extraction means so as to extract the digital image data. Though interactively Le broadcast receiving apparatus can obtain a digital broadcasting system as if it receives the image data in both directions.

  Also, digital broadcasting in which a plurality of image data and control information associated with each image data is repeatedly transmitted, and each control information is associated with the corresponding image data and other image data. Receiving means for receiving a digital broadcast including link destination information indicating, extracting means for extracting control information corresponding to the image data, storage means for storing the control information, and reproducing the image data A storage medium that includes a reproduction unit and an operation unit that receives a user operation and has a program execution unit that executes a program stored in the storage medium has link destination information included in the control information. A selection operation determination step for determining a selection operation of a target user, image data specified by link destination information in accordance with the user operation, and corresponding to this Since the program having the extraction control step for controlling the extraction means to extract the control information is stored, by using this storage medium in the conventional digital broadcast receiving apparatus having no interactive function, the digital broadcasting apparatus The user can selectively change broadcast data transmitted in one direction from any one broadcast data to other broadcast data according to link destination information, and can use digital broadcast interactively.

  INDUSTRIAL APPLICABILITY The present invention is utilized as a digital broadcast receiving apparatus that can effectively receive a digital broadcast in which recent data broadcasts are multiplexed.

It is a figure which shows the example of the content displayed as 1 frame on the display screen of a receiving side. It is the figure which showed typically the transmission data transmitted from the transmission side. It is the figure which showed typically the mode of transmission of the transmission data transmitted from a transmission side. 1 is a configuration diagram of Embodiment 1 of a data transmission device and a data reception device of a digital broadcasting system according to the present invention. (A) It is a figure which shows an example of the image data memorize | stored in the presentation information storage part of the said embodiment.

(B) It is a figure which shows an example of the image data memorize | stored in the presentation information storage part of the said embodiment.
It is a figure which shows an example of the navigation information memorize | stored in the navigation information storage part of the said embodiment. It is a figure which shows an example of the navigation information memorize | stored in the navigation information storage part of the said embodiment. It is a figure which shows an example of the structure information table and entry information which are memorize | stored in the structure information storage part of the said embodiment. It is a figure which shows an example of the multiplex information table memorize | stored in the multiplex information storage part of the said embodiment. It is a figure which shows an example of the content identifier allocation table which the multiplexing control part of the said embodiment produces. It is a figure which shows an example of the display image information identifier allocation table which the multiplexing control part of the said embodiment produces. It is a figure which shows the state which the identifier information addition part of the said embodiment added VE_id to the bit stream private area | region of image data. It is a figure which shows an example of the navigation information table produced | generated by the navigation information table production | generation part of the said embodiment. It is a figure which shows an example of the navigation information table produced | generated by the navigation information table production | generation part of the said embodiment. (A) It is a figure which shows an example of the stream corresponding | compatible table produced | generated by the stream corresponding | compatible information table production | generation part of the said embodiment.

(B) It is a figure which shows an example of the stream corresponding | compatible table produced | generated by the stream corresponding | compatible information table production | generation part of the said embodiment.
(C) It is a figure which shows an example of the stream corresponding | compatible table produced | generated by the stream corresponding | compatible information table production | generation part of the said embodiment.
It is a schematic diagram of the transport stream multiplexed by the multiplexing part of the said embodiment. It is another schematic diagram of the transport stream multiplexed by the multiplexing unit of the embodiment. (A) It is a figure which shows an example of NIT produced | generated by the system information table production | generation part of the said embodiment.

(B) It is a figure which shows an example of SDT produced | generated by the system information table production | generation part of the said embodiment.
(C) It is a figure which shows an example of EIT produced | generated by the system information table production | generation part of the said embodiment.
It is a figure which shows an example of PAT produced | generated by the system information table production | generation part of the said embodiment. It is a figure which shows an example of PMT produced | generated by the system information table production | generation part of the said embodiment. (A) It is a figure which shows the detail of Entry_Descriptor in PMT produced | generated by the system information table production | generation part of the said embodiment.

(B) It is a figure which shows the detail of NE_Component_Descriptor in PMT produced | generated by the system information table production | generation part of the said embodiment.
(C) It is a figure which shows the detail of VE_Information Component_Descriptor in PMT produced | generated by the system information table production | generation part of the said embodiment.

(D) It is a figure which shows the detail of stream_identifier_descriptor in PMT produced | generated by the system information table production | generation part of the said embodiment.
It is a schematic diagram of the transport stream multiplexed by the transmission part of the said embodiment. It is a flowchart explaining operation | movement of the data transmission apparatus of the said embodiment. It is a flowchart explaining operation | movement of the data transmission apparatus of the said embodiment. It is a flowchart explaining operation | movement of the data transmission apparatus of the said embodiment. (A) It is a figure which shows an example of the filter conditions memorize | stored in the filter condition memory | storage part of the TS decoder part of the said embodiment.

(B) It is a figure which shows an example of the filter conditions memorize | stored in the filter condition memory | storage part of the TS decoder part of the said embodiment.
(A) It is a figure which shows an example of the display image displayed on the display part of the said embodiment. (B) It is a figure which shows an example of the display image displayed on the display part of the said embodiment.

(C) It is a figure which shows an example of the display image displayed on the display part of the said embodiment.
It is a flowchart explaining the whole operation | movement of the data receiver of the said embodiment. It is a flowchart explaining the detail of S2410 of the said embodiment. It is a flowchart explaining the detail of S2504 of the said embodiment. It is a flowchart explaining the detail of S2506 of the said embodiment. It is a flowchart explaining the detail of S2416 of the said embodiment. It is a block diagram of Embodiment 2 with the data transmitter of a digital broadcasting system which concerns on this invention, and a data receiver. (A) It is a figure which shows an example of the module information table produced | generated by the module information production | generation part of the said embodiment.

(B) It is a figure which shows an example of the module information table produced | generated by the module information production | generation part of the said embodiment.
(C) It is a figure which shows an example of the module information table produced | generated by the module information production | generation part of the said embodiment.
It is the figure which modeled the transport stream produced | generated by the multiplexing part of the said embodiment. It is a flowchart which shows operation | movement of the data transmission apparatus of the said embodiment. It is a flowchart which shows operation | movement of the data transmission apparatus of the said embodiment. It is a flowchart which shows the operation | movement of the switching process of the image data in the data receiver of the said embodiment. It is a figure which shows the example of the audio | voice data memorize | stored in the presentation information storage part of Embodiment 3 of the digital broadcasting system which concerns on this invention. It is a figure which shows the structure information table and entry information which are memorize | stored in the structure information storage part of the said embodiment. It is a figure which shows the multiplex information table memorize | stored in the multiplex information storage part of the said embodiment. It is a figure which shows the content identifier allocation table produced in the multiplexing control part of the said embodiment. It is a figure which shows an example of the navigation information table produced | generated by the navigation information table production | generation part of the said embodiment. It is the figure which modeled the transport stream multiplexed by the multiplexing part of the said embodiment. (A) It is a figure which shows an example of PMT produced | generated by the system information table production | generation part of the said embodiment.

(B) It is a figure which shows the detail of the Entry_Descriptor.
It is the figure which modeled the transport stream transmitted with the transmission part of the said embodiment. It is a flowchart which shows operation | movement of the said embodiment. It is a flowchart which shows the operation | movement of the audio | voice switching of the said embodiment.

Explanation of symbols

101, 3351 Data transmission device 102 Transmission data storage unit 103, 3352 Data multiplexing unit 104 Multiplex information storage unit 105 System information table generation unit 106 Transmission unit 107 Presentation information storage unit 108 Navigation information storage unit 109 Structure information storage unit 110, 3354 Multiplex control unit 111 Stream correspondence information table generation unit 112 Identifier information addition unit 113 Navigation information table generation unit 114 Multiplexing unit 121, 3361 Data reception device 122 Reception unit 123 TS decoder unit 124 AV decoder unit 125, 3363 Received data storage unit 126 , 3362 Reception control unit 127 Signal reception unit 128 Playback unit 129 Display unit 130 Audio output unit 131 Filter condition storage unit 132 Stream correspondence information table storage unit 133 Navigation information table storage unit 134 System information table storage unit 3353 Module information generation unit 3364 Module information storage unit

Claims (3)

A digital broadcast receiver that receives a digital broadcast in which a plurality of image data is repeatedly transmitted,
The digital broadcast has a plurality of image data each assigned an image data identifier and assigned a different first image stream identifier,
A plurality of image correspondence tables including a value equivalent to an image data identifier corresponding to each image data and a second image stream identifier corresponding to the first image stream identifier assigned to the corresponding image data are multiplexed and multiplexed. Sent repeatedly as an encrypted stream,
Receiving means for receiving the digital broadcast;
Extracting means for extracting one image data from the received digital broadcast;
Storage means;
Playback means for playing back the extracted image data;
An operation means for accepting a user's selection operation;
An extraction control means for setting an extraction condition in the extraction means based on a user operation,
The extraction means extracts an image correspondence table with an image correspondence table identifier that matches a set extraction condition from the multiplexed stream,
The storage means stores the extracted image correspondence table,
The operation means accepts a switching designation operation from the image data being reproduced by the reproduction means to designated image data;
The extraction means further extracts image data that matches a set extraction condition,
The extraction control means sets an image correspondence table identifier having a value equivalent to the image data identifier of the designated image data as an extraction condition, and reads out the second image stream identifier described in the stored image correspondence table An extraction condition is set in the extraction unit using the read second image stream identifier. 2. The digital broadcast receiving apparatus according to claim 1, wherein the extracting unit stops extracting the image data after extracting one image data. A digital broadcast receiving method for receiving a digital broadcast in which a plurality of image data is repeatedly transmitted,
The digital broadcast has a plurality of image data each assigned an image data identifier and assigned a different first image stream identifier,
A plurality of image correspondence tables including a value equivalent to an image data identifier corresponding to each image data and a second image stream identifier corresponding to the first image stream identifier assigned to the corresponding image data are multiplexed and multiplexed. Sent repeatedly as an encrypted stream,
Receiving the digital broadcast; and
An extraction step of extracting one image data from the received digital broadcast;
Memorizing step;
A playback step of playing back the extracted image data;
An operation step for accepting a user's selection operation;
An extraction control step of setting an extraction condition in the extraction means based on a user operation,
In the extraction step, an image correspondence table with an image correspondence table identifier that matches the set extraction condition is extracted from the multiplexed stream.
The storing step stores the extracted image correspondence table;
The operation step accepts a switching designation operation from the image data reproduced in the reproduction step to designated image data,
The extraction step further extracts image data that matches a set extraction condition,
The extraction control step sets an image correspondence table identifier having a value equivalent to the image data identifier of the designated image data as an extraction condition, and reads the second image stream identifier described in the stored image correspondence table A digital broadcast receiving method, wherein an extraction condition is set in the extraction means using the read second image stream identifier.

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