JP6733007B2 - Digital television broadcasting system and its transmitter and receiver - Google Patents

Description

The present invention relates to a digital television broadcasting system, a transmitter and a receiver thereof.

Currently, in digital television broadcasting, HDTV (High Definition Television) video signals with 1920 or 1440 horizontal pixels and 1080 vertical pixels are mainly used, but higher-definition video distribution is required. Came to be. For this reason, standardization has been made for ultra-high definition television broadcasting by UHDTV (Ultra High Definition Television) of 4K, which has 4 times the number of screen pixels (3840 x 2160) or 16 times (7680 x 4320) compared to HDTV. It is being advanced.

By the way, in the current terrestrial digital television broadcasting, a section format table called CDT (Common Data Table) is applied to the transmission of service logo data such as a logo mark used in a program section. ARIB TR-B14 Version 5.9, Part 1, 5.4, in the CDT method transmission, regarding the section_number field, there are all the sections numbered from 0 to the number indicated by last_section_number. In the case of service logo data transmission, , The logo of each size will be transmitted in the section of section_number that matches the logo_type value.” This means that when transmitting logo data with a certain logo_type value, all types of logo data from 0 to the logo_type value are transmitted in 1 section units without exception.

"Terrestrial Digital Television Broadcasting Operation Regulations" ARIB TR-B14 5.9 version Revised July 03, 2015 Part 1

In the above-mentioned transmission method of logo data in digital television broadcasting, it is not possible to transmit logo data of a size that exceeds 1 section, in other words, a size that spans multiple sections. There is a problem that it is not possible to select and transmit only logo_type logo data of. Therefore, when the digital television broadcasting is made to have an extremely high definition, the expandability, flexibility, and transmission efficiency of the operation of logo data are impaired.

An object of the present invention is to provide a digital television broadcasting system capable of expanding the operation of logo data and improving flexibility and transmission efficiency, and a transmitting device and a receiving device thereof when the image is made to have an extremely high definition. Is.

A digital television broadcasting system according to an embodiment is a digital television having a size exceeding one section of MH-CDT (MH-Common Data Table) and capable of multiplex transmission of an arbitrary number of different types of logo data for each logo identification. It is a John broadcasting system and has a transmission system and a reception system. The transmission system modularizes the logo data according to the logo identification and logo type, and distributes the modularized logo data to a plurality of MH-CDT sections of the MH-CDT identified by the download data identification (download_data_id). , MH-SDT (Service Description Table ) to generate an MH-Logo transmission descriptor indicating logo management information including logo identification of the logo data, logo type and download data identification (download_data_id). ), the MH-CDT and MH-SDT are multiplexed with the broadcast signal and transmitted. The receiving system receives the broadcast signal , acquires the MH-CDT and MH-SDT from the received broadcast signal, and extracts the MH-logo transmission descriptor from the MH-SDT acquired from the broadcast signal. From the plurality of MH-CDT sections of the MH-CDT identified by the download data identification (downlead_data_id) included in the logo management information among the MH-CDTs acquired from the broadcast signal. Based on the logo identification and the logo type included in the logo management information, the modularized logo identification and logo data for each logo type are acquired.

The transmitter for digital television broadcasting according to the embodiment has a size exceeding one section of the MH-CDT (MH-Common Data Table) and can multiplex-transmit an arbitrary number of different types of logo data for each logo identification. Used in a digital television broadcasting system, the logo data is identified by the logo identification, a modularization unit that modularizes each logo type, and the logo data modularized by the modularization unit is identified by download data identification (downlead_data_id). and MH-CDT sectioning unit that distributes the plurality of MH-CDT section of MH-CDT is, the logo identifies the logo data, indicating the logo management information including the type and downloading data identification logo (downlead_data_id) MH- logo An MH-logo transmission descriptor generation unit that generates a transmission descriptor, an MH-SDT sectioning unit that describes the MH-logo transmission descriptor in the descriptor area of an MH-SDT (Service Description Table), and the MH- A CDT sectioning unit and a multiplexing unit that multiplexes the MH-CDT and MH-SDT generated by the MH-SDT sectioning unit into a broadcast signal, and transmits the broadcast signal obtained by the multiplexing unit. ..

The receiver for digital television broadcasting according to the embodiment has a size exceeding one section of MH-CDT (MH-Common Data Table) and can multiplex transmit an arbitrary number of different types of logo data for each logo identification. A plurality of MHs of MH-CDT used in a digital television broadcasting system, wherein the logo data is modularized for each of the logo identification and logo type, and the modularized logo data is identified by a download data identification (downlead_data_id). -Generate an MH-Logo transmission descriptor indicating the logo management information including the logo identification of the logo data, the logo type, and the download data identification (downlead_data_id) in the CDT section, and generate the MH-logo transmission descriptor. -A receiver that describes the MH-CDT and MH-SDT in a descriptor area of an SDT (Service Description Table) and transmits the multiplexed MH-CDT and MH-SDT, and a receiver that receives the broadcast signal and the reception Obtaining the MH-CDT and MH-SDT from the broadcast signal received by the unit, obtain the logo management information by extracting the MH-logo transmission descriptor from the MH-SDT obtained from the broadcast signal, Among the MH-CDTs obtained from the broadcast signal, the logo identification included in the logo management information from the plurality of MH-CDT sections of the MH-CDT identified by the download data identification (downlead_data_id) included in the logo management information. And a logo data acquisition unit that acquires the modularized logo identification based on the logo type and logo data for each logo type.

The block diagram which shows the structure of the transmitter for broadcasting of the digital television broadcasting system which concerns on 1st Embodiment. FIG. 3 is a diagram for explaining an area for storing a processing result of a logo data modularization unit of the transmission device shown in FIG. 1. FIG. 3 is a diagram showing a CDT data structure used in a CDT sectioning unit of the transmitting apparatus shown in FIG. 1. The figure which shows the data structure of the logo data distribution descriptor of the transmitter shown in FIG. FIG. 3 is a block diagram showing the configuration of a broadcast receiving device of the digital television broadcasting system according to the first embodiment. 6 is a flowchart for explaining a processing operation regarding logo data of the receiving device shown in FIG. 5. FIG. 3 is a block diagram showing a configuration of a broadcasting transmitter of the digital television broadcasting system of the first embodiment when applied to TLV/MMT, and of the second and third embodiments. The figure which shows the data structure which extended the MH-logo transmission descriptor in the transmitter shown in FIG. 9 is a flowchart for explaining the processing operation of the broadcasting transmitter of the digital television broadcasting system according to the third embodiment. The figure which shows the data structure regarding data_module_byte of the processing operation shown in FIG. The figure which shows the other data structure regarding data_module_byte of the processing operation shown in FIG.

An embodiment of the present invention will be described below with reference to the drawings.

(First embodiment)
Hereinafter, the digital television broadcasting system according to the first embodiment will be described with reference to FIGS. 1 to 6.

FIG. 1 is a block diagram showing the configuration of a broadcasting transmitter of the digital television broadcasting system according to the present embodiment. This broadcasting transmitter inputs, for example, logo data used in a program display section such as an EPG (Electronic Program Guide) and logo management information for managing the logo of this logo data, and the logo data modularization unit 11 , CDT sectioning section 12, logo data distribution descriptor generating section 13, logo transmission descriptor generating section 14, SDT (Service Definition Table) sectioning section 15, and multiplexing section 16 performs video signal, audio signal, PSI ( Program Specific Information), SI (Service Information) other than CDT, SDT, etc. are multiplexed as MPEG-2_TS (Transport Stream) (hereinafter TS), and transmission path coding such as error correction coding and modulation (not shown) is performed. ) And then send it to the service area as a broadcast signal.

Here, in the transmission method of service logo data for digital television broadcasting, a section type table called CDT (Common Data Table) is used based on the standard of ARIB TR-B14, 5.4.1.2, and the logo type ( Logo_type) and logo management information indicating the correspondence between the sections to be transmitted are defined as new descriptors and transmitted with the logo data.

Usually, the logo used for broadcasting is different for each broadcasting channel (service). Therefore, each logo data is given a logo identification (hereinafter, logo_id) to be identified and managed by the receiver. In addition, the same logo_id is given to logo data of multiple sizes that have the same design and color, and the number of pixels etc. differs depending on the assumed receiver and its application etc., and each type has a logo type ( Below, it is distinguished by logo_type). The logo_id is updated and managed by the version number (hereinafter, logo_version).

The transmitted logo data is sent to the logo data modularization unit 11 together with logo_id, logo_type and logo_version which are logo management information. This logo data modularization unit 11 compresses the input logo data, and for each logo_id and logo_type, the logo data of the data structure specified in FIG. 2 (cited from Table 5-15 in 5.4.1.2 of ARIB TR-B14). Store in an area called a module. This logo data module has a data_size field of 16 bits, but cannot store 64 kbytes of data in the CDT section.

The logo data module conversion section 11 sends the logo data module to the CDT section conversion section 12. The CDT sectioning section 12 distributes the logo data module to a plurality of sections of the CDT and transmits it to the multiplexing section 16. Here, the CDT has a data structure as shown in FIG. 3 (quoted from Table 5-14 in 5.4.1.2 of ARIB TR-B14). The CDT is identified for each download data identification (hereinafter, download_data_id). One section of the CDT has a maximum size of 4 kbytes indicated by the section_length field, and the CDT can be divided into up to 256 sections for transmission.

The logo management information logo_id, logo_type, logo_version are also sent to the logo data distribution descriptor generation unit 13 and the logo transmission descriptor generation unit 14. The logo data distribution descriptor generation unit 13 generates, for each logo data, a logo data distribution descriptor indicating the correspondence between the logo_type and the distributed CDT section, and sends the logo data distribution descriptor to the CDT section conversion unit 12, and the descriptor area of the CDT. To place. In addition, the logo transmission descriptor generation unit 14 sets 0x01 separately when the CDT transmission method 1 is specified by the logo transmission type (logo_transmission_type), and sets the logo data of the logo identification (logo_id) and logo version number (logo_version). A logo transmission descriptor is generated by adding download data identification (download_data_id) together with management information. By setting the same value as the download_data_id of the download_data_id of the CDT here, it becomes possible to specify the CDT transmission logo data corresponding to a certain broadcast channel (service). In the SDT sectioning section 15, a logo transmission descriptor is arranged in the descriptor area of the SDT for each service_id that specifies a broadcast channel and transmitted to the multiplexing section 16, and TS multiplexing is performed together with the CDT section data.

Now, if the size of data for each logo_type stored in the logo data module is within the size of one section, 4 kbytes, one section can be used for transmission. However, in the case of transmitting logo data having a large number of pixels such as 4K and 8K broadcasting, there is a possibility of exceeding 4 kbytes. Also, in ultra high definition digital broadcasting, if you do not use the logo_type with a small number of pixels among the logo_type used in terrestrial digital broadcasting, you want to select only the logo of a type that is somewhat large and transmit it in any order Can also be considered. For these reasons, the “logo of each size”, which was determined by the operation regulations for terrestrial digital broadcasting, is transmitted as it is in the section of section_number that matches the “logo_type” value. Cannot be used. Therefore, in this embodiment, the logo data distribution descriptor is defined so that CDT can be transmitted even in such a case. The data structure of this logo data distribution descriptor is as shown in FIG. 4, for example.

The logo data module identified by logo_type is divided into CDT sections with consecutive section numbers for transmission, and the first section number is described in the start_section_number field, and the number of section divisions for transmitting the logo data module is set. Describe in the numbers_of_sections field. For example, it is assumed that two types of logo_type logo data are transmitted, 1000 bytes of logo data with logo_type=0x05 is section number 0, and logo_type of 10000 bytes logo data is 0x06, and 4000 bytes, 4000 bytes, 2000 bytes are divided into 3 sections. It is divided and transmitted in order from section number 1. in this case,
logo_type=0x05, start_section_number=0x00, numbers_of_sections=0x01
logo_type=0x06, start_section_number=0x01, numbers_of_sections=0x03
Can be described as Then, this logo data distribution descriptor is placed in the descriptor area of the CDT and transmitted. The transmission system of these series of logo data is as shown in FIG.

On the other hand, when the corresponding broadcast receiving device detects that the logo transmission descriptor is placed in the descriptor area of the SDT for the logo data of the desired broadcast channel (service), the CDT of the service is detected. Is determined to have been transmitted, and the specified download_data_id is referred to, first of all the relevant CDT section is acquired. In this way, by analyzing the logo data distribution descriptor described in the acquired CDT section, it is possible to know which logo_type logo data is transmitted in which section number section (group). Then, by setting the required logo_type section number to be filtered next, it becomes possible to efficiently acquire the logo data.

Next, the configuration of the broadcast receiving device will be described. FIG. 5 is a block diagram showing the configuration of the broadcast receiving device. As shown in FIG. 5, the broadcast receiving device includes a transmission path decoding unit 201, a module I/F unit 202, a section processing unit 203, a TS processing unit 204, a video decoding unit 205, an audio decoding unit 206, and an OSD processing unit 207. (OSD: On-Screen Display), communication I/F unit 208, operation unit 209, NVRAM 210 (NVRAM: Non-Volatile RAM), ROM 211 (ROM: Read Only Memory), RAM 212 (RAM: Random Access Memory), CPU 213 ( A CPU (Central Processing Unit), a descrambler 214, and a storage unit 215 are provided, and each unit is connected by a bus 216.

The transmission path decoding unit 201 performs demodulation processing and error correction decoding processing on a broadcast signal received from a reception antenna (not shown) to obtain a transport stream TS. The TS processing unit 204 performs a process of separating packet-multiplexed information as a transport stream TS and extracting a video signal and an audio signal. In addition, the section processing unit 203 cooperates with the TS processing unit 204 to extract PSI (Program Specific Information) and SI (Service Information) demultiplexed from the transport stream TS, and further related information in section format such as CDT. Perform processing. For example, by setting a filtering condition, it is also possible to extract only a section having a specific section number from an EIT or a CDT that is generally composed of a plurality of sections.

The video decoding unit 205 decodes the video signal output from the TS processing unit 204 and outputs the decoded video signal to the OSD processing unit 207. The audio decoding unit 206 decodes the audio signal output from the TS processing unit 204 and outputs the decoded audio signal to the audio output device 221. The audio output device 221 is an audio device including an amplifier and a speaker, and performs audio reproduction according to the audio signal output from the audio decoding unit 206. Under the control of the CPU 213, the OSD processing unit 207 performs predetermined OSD processing on the video signal output from the video decoding unit 205 and outputs the video signal to the display device 222. The display device 222 is an LCD (Liquid Crystal Display) or the like, and displays a screen based on the output video signal. For example, the display device 222 displays a screen such as an EPG based on the SDT described in the broadcast channel information and the EIT described in the program information included in the SI separated from the multiplexed transport stream TS1.

The communication I/F unit 208 is an interface that performs data communication with the communication network 4 according to a predetermined communication protocol under the control of the CPU 213. The operation unit 209 is an operation key, a remote controller, or the like, and receives an operation input of the user. The NVRAM 210 stores various setting information. For example, the NVRAM 210 stores, as setting information, a content format that the broadcast receiving apparatus 2 can handle.

The ROM 211 stores a program executed by the CPU 213 and the like. The RAM 212 provides a work area when the CPU 213 executes a program. The RAM 212 also provides an area for temporarily storing the EIT information included in the SI separated from the multiplexed transport stream TS1. The CPU 213 centrally controls the operation of the broadcast receiving device 2 by expanding the program stored in the ROM 211 into the work area of the RAM 212 and sequentially executing the program.

The module I/F unit 202 is an interface that connects to the security module 220 that stores encryption key information for conditional access and the like.

The descrambler 214 descrambles the scrambled payload part in the received transport stream TS1 based on the encryption key information stored in the security module 220. The descrambler by the descrambler 214 allows the broadcast receiving device 2 to perform limited reception using EMM or ECM. The storage unit 215 is a large-capacity storage medium such as an HDD and stores, for example, received contents and the like.

Next, the processing operation relating to the logo data of the broadcast receiving device executed under the control of the CPU 213 will be described with reference to the flowchart shown in FIG.

First, when a broadcast signal is received (step S11), the broadcast signal is demodulated to obtain SDT (step S12). Here, regarding the logo data of the desired broadcast channel (service), the presence or absence of the logo transmission descriptor is repeatedly determined from the acquired SDT (step S13), and if the SDT has the description of the logo transmission descriptor (YES). From the logo transmission descriptor, it is determined whether there is any unreceived logo (step S14). Based on the determination result of step S14, the CDT section of any section_number of the designated service is acquired (step S15), and the logo data distribution descriptor is extracted from the acquired CDT section and analyzed (step S16). Based on the analysis result, the CDT section of section_number for the desired logo_type of the specified service is acquired (step S17), the logo data is acquired from the acquired CDT section (step S18), and the series of processes is ended.

In other words, according to the above procedure, it is possible to know which logo_type logo data is transmitted in which section number section (group), so set the next required logo_type section number to be filtered. By doing so, the logo data can be efficiently acquired.

As described above, in the first embodiment, in the logo data transmission in the section format, the logo data distribution descriptor indicating the correspondence between the logo type and the section to be transmitted is specified and transmitted. Therefore, it becomes possible to efficiently select and transmit the required number of types of logo data in any order without depending on the size of the logo data.

In addition, in this embodiment, the description has been made using the CDT based on the MPEG-2 TS which is adopted in the current terrestrial broadcasting, but TLV (Type Length Value)/MMT (which is expected to be adopted in the advanced BS in the future is described. It may be applied to MH-CDT based on MPEG Media Transport). However, in the case of TLV (Type Length Value)/MMT (MPEG Media Transport), there are the following differences in blocks and processing as compared with MPEG-2 TS. For MH-, see “Reference 1 Structure of control information described in this standard” of ARIB STD-B60 “Note that the tables and descriptors specified in ARIB STD-B10 have the same function and MMT. In the case where the table identifier and descriptor tag values are modified to be used in the broadcasting system that uses, the original table and descriptor are distinguished by adding "MH-" that means MPEG-H at the beginning of the name. There is. Is explained.

The MH-CDT section of TLV/MMT corresponds to the CDT section of MPEG-2 TS, the MH-SDT section of TLV/MMT corresponds to the SDT section of MPEG-2 TS, and the MH-logo transmission descriptor of TLV/MMT. Corresponds to the MPEG-2 TS logo transmission descriptor.

The data structure of the above MH-CDT is described in ARIB STD-B60, 7.3.3.10. In this case, for example, even if the number of bits of the tag field (descriptor_tag) of the logo data distribution descriptor of FIG. 2 is set to 16 bits, its essence is not changed.

(Second embodiment)
Hereinafter, as a second embodiment, a broadcasting transmitter in the case of the TLV/MMT will be described. FIG. 7 shows the configuration, in which the logo data and logo management information for managing the logo of this logo data are input, and the logo data modularization unit 21, MH-CDT section conversion unit 22, and MH-logo transmission, respectively. After passing through the descriptor generating unit 23 and the MH-SDT sectioning unit 24, the MMT multiplexing unit 25 multiplexes it with a video signal, an audio signal, etc., and performs transmission line coding such as error correction coding and modulation (not shown). Then, the signal is transmitted to the service area as a broadcast signal.

Specifically, the transmitted logo data is sent to the logo data modularization unit 21 together with logo_id, logo_type, and logo_version which are logo management information. The logo data modularization unit 21 stores the input logo data for each logo_id and logo_type in an area called a logo data module. The logo data module conversion section 21 sends the logo data module to the MH-CDT section conversion section 22. The MH-CDT sectioning section 22 distributes the logo data module to a plurality of sections of the MH-CDT and transmits it to the MMT multiplexing section 25. Here, the MH-CDT is identified for each download_data_id. The logo data distribution information of the MH-CDT sectioning section 22 is sent to the MH-logo transmission descriptor generating section 23.

The logo management information logo_id, logo_type, and logo_version are also sent to the MH-logo transmission descriptor generation unit 23. In the MH-logo transmission descriptor generation unit 23, if CDT transmission method 1 is specified in the logo transmission type (logo_transmission_type), 0x01 is set separately, and the logo with the logo identification (logo_id) or logo version number (logo_version) is set. A logo transmission descriptor is generated by adding download data identification (download_data_id) together with the data management information. By setting the same value as download_data_id of download_data_id of MH-CDT here, it becomes possible to specify the MH-CDT transmission logo data corresponding to a certain broadcast channel (service). Here, the MH-logo transmission descriptor generating unit 23 receives the logo data distribution information from the MH-CDT sectioning unit 22, and expands the content of the logo data distribution information in the MH-logo transmission descriptor.

In the MH-SDT sectioning section 24, an MH-logo transmission descriptor is placed in the descriptor area of the MH-SDT for each service_id that identifies the broadcast channel, and is transmitted to the MMT multiplexing section 25, and the MH-CDT section data is transmitted. Multiplex with.

The essential difference from the configuration of the first embodiment shown in FIG. 1 is that instead of newly defining the logo data distribution information as a descriptor and describing it in the descriptor area in MH-CDT, it describes it in MH-SDT. MH-Logo transmission descriptor is to be expanded and described. The state of this expansion is shown in FIG.

According to this configuration, by describing in the MH-SDT, the logo data distribution information can be acquired before the acquisition of the MH-CDT, so the receiver side first acquires one of the MH-CDT sections and acquires the logo. Speaking of FIG. 8 of confirming the data distribution descriptor, the step of S15 is not necessary, and the required logo_type logo data can be acquired more efficiently.

The processing of this embodiment is also applicable to the case of the MPEG-2 TS system of the first embodiment.

(Third Embodiment)
The third embodiment can be realized by a sending device similar to that of the second embodiment. However, the logo data distribution information is not inserted in the MH-logo transmission descriptor. The logo data distribution information is fixedly decided in advance according to the operation regulations, or additionally inserted into the data_module_byte of MH-CDT.

In advanced broadband satellite digital broadcasting, logo_type is defined for three types of size patterns. One is "2K", which is the same as "HD Large" defined in terrestrial digital broadcasting. The other two are "Small" which is supposed to be displayed on a 4K screen and "Large" which is supposed to be displayed on an 8K screen. The number of dots in the vertical and horizontal directions is twice that of "2K". Quadrupled. Also, with the "small" and "large" logos, although the number of colors that can be used at the same time is limited, a color palette is also transmitted in order to be able to use 8-bit RGB full-color colors. Therefore, the upper limit of the logo data size is large.

The maximum size of the "2K" logo is 1152 bytes, which is the same as that for "HD large" terrestrial digital broadcasting, and it is possible to send it with one MH-CDT, but "small" is 8000 bytes and "large" is 16000 bytes. It is assumed to be the upper limit, and one MH-CDT cannot send. For this reason, a new regulation is required to transmit the logo data in multiple MH-CDTs. Hereinafter, as a third embodiment, a method for transmitting logo data by a plurality of MH-CDTs will be described.

FIG. 9 shows the flow of processing according to the third embodiment. In FIG. 9, waiting for the input of the logo data (step S21), when the logo data is input, it is determined whether the logo_type indicates 2K, large, or small, and the logo data is displayed for each logo_type. The value of section_number to be distributed is set (step S22). Next, in consideration of the maximum capacity of the MH-CDT, the logo data is divided and set in the data_module_byte of the MH-CDT section together with the placement information (step S23), and a series of processing is ended.

That is, in the present embodiment, a service logo having a large size that does not fit in one section is transmitted by the MH-CDT by changing only the operation rule such as a change in the definition of data_module_byte. Therefore, it is added to the ARIB standard for the purpose of creating a new data structure other than MH-CDT, describing a new descriptor to be inserted in MH-CDT, or changing the definition of MH-logo transmission descriptor. And no need to make changes.

Hereinafter, Examples 1 to 5 will be described as to the specific processing of the present embodiment.

[Example 1]
In the logo data modularization unit 11 shown in FIG. 1, for the syntax of data_module_byte of terrestrial digital broadcasting, the number of bytes of the logo of the corresponding logo_type, that is, the total size of the data divided into each section is Add a field called "total_logo_size". An example thereof is shown in FIG. Also, instead of the stipulation that "the logo of each size is transmitted in the section of section_number that matches the logo_type value" in terrestrial digital broadcasting, the section_number value used for each logo_type is fixed and used. Make the rules as specified. Here, if
2K 0
Large 1-4
Small 5-6
And Also, the logo data is divided every 4000 bytes and stored in data_byte. By deciding in this way, the range of section_number of the section acquired to receive the logo of each logo_type can be known in advance without using the information in the received MH-CDT. For example, if you want only the small logo, after obtaining all sections with section_number 0 to 6 and then determining the logo_type in data_module_byte to determine that section_number is 5 or 6, the section_number is not Now you only need to get sections 5 and 6.

Also, by adding total_logo_size and determining the division size, it becomes possible to determine that it is not necessary to receive all the sections of section_number determined by logo_type. For example, in the case of a large logo, if total_logo_size is 10000 bytes, you can see that the data_size of sections with section_number 1 to 4 are 4000byte, 4000byte, 2000byte, 0byte, respectively, and you do not need to obtain the section with section_number=4. I understand. Similarly, if the section_number=5 section is acquired and the total_logo_size is 4000 bytes or less, it is understood that the section_number=6 section need not be acquired.

Here, as an example, the section_number values are assigned in the order of the logotype values, but the order is not limited to this.

Further, here, the division size is set to 4000 bytes as an example, but another value may be used. For example, the division size may be 4070 bytes, and a logo whose total_logo_size is 10000 bytes may be divided into 4070 bytes, 4070 bytes, 1860 bytes, and 0 bytes.

Also, here, as an example, total_logo_size is added to data_module_byte to determine the division size, but it is also possible to add information whether there is a continuation in data_module_byte without determining the division size, and also determine the division size. After that, other information such as whether there is a continuation may be further added.

[Example 2]
I don't know in which order the sections are sent in the stream, and while I am getting one section and reconfiguring the section filter to get the next section If one section can be acquired before the next section is acquired, it may take a long time to acquire all desired sections. Also, by setting the section filter at the same time, the acquisition time can be shortened, but a lot of resources of the section filter are consumed.

As a means for avoiding this, it is possible to specify a mask for the condition of the section filter.

It is a function to acquire a section regardless of whether the value of some bits is 0 or 1. Regarding the mask specification of section_number, the bit specified as 0 is 0, the bit specified as 1 is 1, and the bit that may be 0 or 1 is represented by x.

Large logos have a maximum of 4 sections and small logos have a maximum of 2 sections. It is efficient to mask with 2 bits for large logos and 1 bit for small logos. Therefore, the mask designation of the section_number of the large logo is 000001xx (00000100, 00000101, 00000110, 00000111), and the mask designation of the section_number of the small logo is 0000001x (00000010, 00000011). This way, the section_number value used is
Small 2-3
Large 4-7
Becomes in addition
2K 0
In this case, the section with section_number=1 is unnecessary.

Normally, section_number is allocated from 0 to last_section_number without omission, but with EIT[schedule] (and MH-EIT[schedule]), there is an exception that an intermediate section may be omitted. Therefore, if it is specified that the MH-CDT does not send the section of section_number=1, it is possible to transmit the logo data of each logo_type in seven sections with section_number of 0 and 2 to 7. ..

Here, although section_number=1 is not required as an example, logo data of each logo_type may be transmitted in seven sections whose section_number is 1 to 7 with section_number=0 as an unnecessary section.

[Example 3]
When the same mask designation as in the second embodiment is performed, if it can be shown that the data is invalid, it can be realized without performing exceptional operation such as not sending a section in the middle.

For example, it can be realized by deciding not to use the value of 0xFF as the logo_type in the future and determining that it is invalid data when the value of the logo_type of data_module_byte is 0xFF. In the case of a receiver that acquires only the required section_number section, this section is not acquired, so there is no effect on processing. In the case of a receiver that acquires all section_number sections using the mask function of the section filter, it may be determined that the data is invalid data and the data may be discarded.

[Example 4]
Alternatively, when the same mask designation as that in the second embodiment is performed, the logo data itself for one section is not sent, but it can be used for transmitting another information.

The 2K logo will be transmitted with section_number=1, and other information will be transmitted with section_number=0.Section_number=0 can be used to transmit special data and section_number 1 to 7 can be used to transmit logo data. it can.

For example, when section_number=0, data_module_byte is shown in FIG. 11, and it is possible to indicate which logo_type of logo data is being sent at each section number, that is, logo data distribution information. In the example of FIG. 11, a loop is rotated by number_of_logo_type, which is the number of logo_types, and the number of bytes of logo data for each section_number (start_section_number + j) used in each logo_type can be specified.

[Example 5]
If data_module_byte as shown in FIG. 11 is transmitted with section_number=0, even if the range of section_number used in each logo_type is not fixed in the operational rules, the section_number of the desired logo_type will be obtained after obtaining section_number=0. It is possible to obtain the desired logo_type service logo by taking the two steps of obtaining the section. Although it may take a long time to obtain the desired logo by stepping in two steps, it is possible to deal with the case where a new logo_type is added in the future.

When the range of section_number is not fixed in the operational rules, the number of sections used in logo_type may be fixed to the maximum or may be variable depending on the size of logo data.

As described above, in the third embodiment, by changing the definition of data_module_byte and the allocation rule of section_number, a new data structure other than MH-CDT or a new descriptor to be inserted into MH-CDT is ARIB. It is possible to transmit a service logo of a large size that does not fit in one section with MH-CDT without additional definition in the standard or changing the definition of the MH-logo transmission descriptor of ARIB standard. ..

In addition, in the first to fourth embodiments, it is possible to acquire only the section of the desired logo_type section_number as in the terrestrial digital broadcasting. Further, in Examples 2 to 4, by setting the section filter by masking the section_number, it is possible to efficiently obtain the large logo and the small logo. Further, in the fifth embodiment, it is possible to deal with the case where a new logo_type is added in the future.

In the embodiment, CDT and MH-CDT are generically referred to as common data table information, SDT and MH-SDT are generically referred to as service description table information, and logo transmission descriptor and MH-logo transmission descriptor are logo transmission descriptor. Shall be collectively referred to.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the scope of equivalents thereof.

11... Logo data modularization unit, 12... CDT section conversion unit, 13... Logo data distribution descriptor generation unit, 14... Logo transmission descriptor generation unit, 15... SDT section conversion unit, 16... Multiplexing unit, 21... Logo Data modularization unit, 22... MH-CDT sectioning unit, 23... MH-logo transmission descriptor generation unit, 24... MH-SDT sectioning unit, 25... MMT multiplexing unit, 2201... Transmission path decoding unit, 202... Module I/F unit, 203... Section processing unit, 204... TS processing unit, 205... Video decoding unit, 206... Audio decoding unit, 207... OSD processing unit, 208... Communication I/F unit, 209... Operation unit, 210 ... NVRAM, 211... ROM, 212... RAM, 213... CPU, 214... Descrambler, 215... Storage unit, 216... Bus.

Claims (3)

A digital television broadcasting system having a size exceeding one section of MH-CDT (MH-Common Data Table) and capable of multiplex transmission of any number of different types of logo data for each logo identification,
Modularize the logo data by the logo identification and logo type,
Distribute modularized logo data to multiple MH-CDT sections of MH-CDT identified by download data identification (download_data_id) ,
Generating an MH-Logo transmission descriptor showing logo management information including the logo identification of the logo data, the logo type and the download data identification (download_data_id) ,
Describe the MH-logo transmission descriptor in the descriptor area of MH-SDT (Service Description Table),
A transmission system that multiplexes the MH-CDT and MH-SDT into a broadcast signal and sends the multiplexed signal,
Receive the broadcast signal , obtain the MH-CDT and MH-SDT from the received broadcast signal ,
Obtaining the logo management information by extracting the MH-logo transmission descriptor from the MH-SDT obtained from the broadcast signal,
Among the MH-CDTs obtained from the broadcast signal, the logo identification included in the logo management information from the plurality of MH-CDT sections of the MH-CDT identified by the download data identification (downlead_data_id) included in the logo management information. A digital television broadcasting system comprising: a modularized logo identification based on a logo type; and a reception system for acquiring logo data for each logo type. A transmitter used in a digital television broadcasting system that is larger than one section of the MH-CDT (MH-Common Data Table) and can multiplex transmit an arbitrary number of different types of logo data for each logo identification. ,
A modularization unit that modularizes the logo data by the logo identification and logo type,
An MH-CDT sectioning unit that distributes the logo data modularized by the modularization unit to a plurality of MH-CDT sections of the MH-CDT identified by download data identification (downlead_data_id) ,
An MH- logo transmission descriptor generation unit for generating an MH-logo transmission descriptor indicating logo management information including the logo identification of the logo data, the logo type and the download data identification (downlead_data_id) ;
An MH-SDT sectioning unit that describes the MH-logo transmission descriptor in the descriptor area of MH-SDT (Service Description Table),
The MH-CDT sectioning section, comprising a multiplexing section for multiplexing the MH-CDT and MH-SDT generated by the MH-SDT sectioning section into a broadcast signal,
A transmitter for digital television broadcasting, which transmits the broadcast signal obtained by the multiplexer. A receiver used in a digital television broadcasting system that is larger than one section of the MH-CDT (MH-Common Data Table) and can multiplex transmit an arbitrary number of different types of logo data for each logo identification. ,
Wherein the logo data logo identification, modularized for each type of logo, and distributed to a plurality of MH-CDT section of MH-CDT identified logo data to which the are modules by downloading data identification (downlead_data_id), the logo Generate MH-Logo transmission descriptor showing logo management information including logo identification of data, logo type and download data identification (downlead_data_id), and describe the MH-logo transmission descriptor in MH-SDT (Service Description Table). Described in the child area, the MH-CDT and MH-SDT are compatible with a transmission device that multiplexes the broadcast signal and sends it.
A receiver for receiving the broadcast signal,
Acquiring the MH-CDT and MH-SDT from the broadcast signal received by the receiving unit, extracting the MH-logo transmission descriptor from the MH-SDT acquired from the broadcast signal, and acquiring the logo management information. However, among the MH-CDTs obtained from the broadcast signal, the logo management information is included from a plurality of MH-CDT sections of the MH-CDT identified by the download data identification (downlead_data_id) included in the logo management information. A receiver for digital television broadcasting, comprising: a logo identification and a logo data acquisition section that obtains logo data for each type of logo based on the logo identification and the logo type .

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