JP7807937B2 - Receiving device, transmitting device, transmitting/receiving system, receiving method, transmitting method, and program - Google Patents

Description

The present invention relates to a receiving device, a transmitting device, a transmitting/receiving system, a receiving method, a transmitting method, and a program.

Conventionally, the standard MPEG (Moving Picture Experts Group)-DASH (Dynamic Adaptive Streaming over HTTP) (ISO/IEC23009-1) has been used for streaming distribution of moving images such as video on demand (VOD) on the Internet (see, for example, Patent Document 1). Use of this MPEG-DASH for presenting broadcast video and audio in television broadcasting networks such as next-generation terrestrial digital broadcasting is being considered.
Furthermore, the Advanced Television Systems Committee (ATSC) 3.0, a next-generation broadcasting standard currently being developed in the United States, envisions a model in which all files acquired via broadcast or communication are temporarily stored in a local cache on a local file system of a client device. However, due to limitations on the tuner and storage resources of the receiving device, it is not possible to cache all files on receivable broadcast waves. Therefore, it is envisioned that only the files required for the currently selected service are acquired and cached, and when the service (channel) is switched, the storage resources are immediately released (see, for example, Patent Document 1).

International Publication No. 2017/090457

However, MPEG-DASH requires a program called a DASH player to receive video, and when a viewer selects a channel and then receives the DASH player distributed by each broadcasting station via airwaves, there is a problem in that it can take a long time from selecting a channel to presenting the content due to the time it takes to receive the DASH player.

The present invention was made in consideration of these circumstances, and provides a receiving device, transmitting device, transmitting/receiving system, receiving method, transmission method, and program that can reduce the time between when a viewer selects a channel and when content is presented.

This invention has been made to solve the above-mentioned problems, and one aspect of the present invention is a receiving device comprising a tuner unit that receives television broadcast signals, a demultiplexer unit that acquires content and a DASH player required to play the content from the signals, and a DASH player storage unit that stores the DASH player in a non-volatile storage area.

Another aspect of the present invention is the above-mentioned receiving device, in which, at a set time, the tuner unit receives the television broadcast signal, and the demultiplexer unit obtains a DASH player from the signal and stores it in the DASH player storage unit.

In another aspect of the present invention, the signal includes update information indicating the time, and the demultiplexing unit acquires the DASH player based on the update information and stores it in the DASH player storage unit.

In another aspect of the present invention, in the receiving device described above, the update information includes at least information indicating the channel of the television broadcast.

In another aspect of the present invention, in the receiving device described above, the demultiplexing unit acquires the DASH player and stores it in the DASH player storage unit during a channel scan to confirm that the television broadcast signal can be received.

In another aspect of the present invention, the above-mentioned receiving device has a file name for the DASH player that is common to multiple television broadcasts and is predetermined, and the demultiplexing unit acquires the DASH player using the file name.

In another aspect of the present invention, the receiving device described above is configured such that control information including information indicating the file name of the DASH player is included in the television broadcast signal, and the demultiplexing unit acquires the information indicating the file name and then uses the file name to acquire the DASH player.

Another aspect of the present invention is a transmitting device comprising a multiplexing unit that multiplexes content with a DASH player required for playback of the content to generate a stream, and a transmitting unit that converts the stream into a television broadcast signal and transmits it.

In another aspect of the present invention, the above-mentioned transmitting device is configured such that the multiplexing unit also multiplexes update information indicating the time at which the receiving device should update the DASH player.

In another aspect of the present invention, in the above-mentioned transmission device, the update information includes at least information indicating the channel of the television broadcast.

Another aspect of the present invention is the above-mentioned transmission device, wherein the file names of the DASH player are common across multiple television broadcasts and are predetermined.

In another aspect of the present invention, the above-mentioned transmission device is configured such that the multiplexing unit further multiplexes control information including information indicating the file name of the DASH player.

Another aspect of the present invention is a receiving method using a receiving device, comprising the steps of receiving a television broadcast signal, acquiring a DASH player required for content playback from the signal, and storing the DASH player in a non-volatile memory area.

Another aspect of the present invention is the above-mentioned receiving method, in which the step of receiving the television broadcast signal is performed at a set time.

Another aspect of the present invention is a transmission method using a transmitting device, which includes the steps of multiplexing content and a DASH player required to play the content to generate a stream, and converting the stream into a television broadcast signal and transmitting it.

In another aspect of the present invention, in the above-mentioned transmission method, in the step of generating the stream, update information indicating the time at which the receiving device should update the DASH player is also multiplexed.

Another aspect of the present invention is a program for causing a computer to function as a demultiplexer that acquires content and the DASH player required to play the content from a television broadcast signal received by a tuner, and as a DASH player storage unit that stores the DASH player in a non-volatile storage area.

Another aspect of the present invention is the above-mentioned program, in which, at a set time, the tuner unit receives the television broadcast signal, and the demultiplexer unit obtains a DASH player from the signal and stores it in the DASH player storage unit.

Another aspect of the present invention is a program that causes a computer to function as a multiplexing unit that multiplexes content with a DASH player required to play the content to generate a stream, and as a sending unit that converts the stream into a television broadcast signal and sends it out.

Another aspect of the present invention is the above-mentioned program, wherein the multiplexing unit also multiplexes update information indicating the time when the receiving device should update the DASH player.

Another aspect of the present invention is a transmission/reception system including the above-mentioned receiving device and the above-mentioned transmitting device.

This invention reduces the time between when a viewer selects a channel and when content is presented.

1 is a schematic block diagram showing an example of the configuration of a television broadcast transmission/reception system 10 according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating an example of a television broadcast signal in the embodiment. 10 is a table showing an example of the contents stored in the DASH player storage unit 104 in the embodiment. 10 is a table showing the configuration of update information in the embodiment. 10 is a flowchart showing an example of a channel scan process performed by the receiving device 100 according to the embodiment. 10 is a flowchart illustrating an example of a DASH player update process performed by the receiving device 100 in the embodiment. 10 is a flowchart illustrating an example of a DASH player update process performed by the transmitting device 200 in the embodiment. 10 is a flowchart showing an example of a DASH player update process performed by the receiving device 100 according to the second embodiment of the present invention. 10 is a flowchart illustrating an example of a DASH player update process performed by the transmitting device 200 in the embodiment.

Embodiments of the present invention will now be described with reference to the drawings. In the first embodiment, a television broadcast transmission/reception system 10 includes both television broadcast networks, such as terrestrial broadcast networks, satellite broadcast networks, and cable television networks, and content distribution via IP (Internet Protocol) networks such as the Internet. In this embodiment, streaming distribution using MPEG-DASH, which has traditionally been used on IP networks, is also used on television broadcast networks. With MPEG-DASH, content reception and playback are controlled by the receiving side executing a program written in Javascript or similar, known as a DASH player.

FIG. 1 is a schematic block diagram showing an example configuration of a television broadcast transmission/reception system 10 according to a first embodiment of the present invention. The transmission/reception system 10 comprises a receiving device 100, a transmitting device (broadcasting system) 200, a network 300, a DASH server 400, a streaming server 500, and a display device 600. The receiving device 100 is capable of receiving both television broadcasts from the transmitting device 200 and streaming services from the streaming server 500. The receiving device 100 is installed, for example, in the residence of a television broadcast viewer. The transmitting device 200 transmits television broadcast signals via a terrestrial broadcast network, satellite broadcast network, cable television network, or the like. This signal is an MMT (MPEG Media Transport) signal, in which, for example, video, audio, closed captions, service information, etc. are multiplexed. Note that MMT is standardized as MPEG-H Part 1 by ISO/IEC 23008-1. Furthermore, the transmitting device 200 is installed, for example, at a broadcasting company that broadcasts television programs.

Network 300 is an IP network such as the Internet. In response to a request from receiving device 100, DASH server 400 transmits a DASH player to receiving device 100 via network 300. Streaming server 500 performs MPEG-DASH streaming distribution to receiving device 100 via network 300. Display device 600 has video display means such as a liquid crystal display or organic EL (Electro Luminescence) display, and audio output means such as a speaker, and displays video and outputs audio in accordance with the video and audio signals output by receiving device 100. Note that in this embodiment, display device 600 is separate from receiving device 100, but it may also be built into receiving device 100.

The receiving device 100 comprises a tuner unit 101, a demultiplexing unit 102, a decoder unit 103, a DASH player storage unit 104, a network I/F (Interface) unit 105, a browser unit 106, and a DASH player execution unit 107. The tuner unit 101 receives television broadcast signals sent by the transmitting device 200. The demultiplexing unit 102 separates and acquires the content and the DASH player required to play the content from the signal received by the tuner unit 101. The content includes at least one of video, audio, and closed captions.

In this embodiment, the demultiplexing unit 102 acquires a DASH player during a channel scan to confirm that the receiving device 100 can receive television broadcast signals, and stores it in the DASH player storage unit 104. The television broadcast signal also contains update information indicating the time at which the receiving device 100 should update the DASH player. When the time set by this update information arrives, the tuner unit 101 receives the television broadcast signal, and the demultiplexing unit 102 acquires a DASH player from the signal received by the tuner unit 101 and stores it in the DASH player storage unit 104.

The DASH player storage unit 104 stores the DASH player acquired by the demultiplexing unit 102 in a non-volatile storage area. The non-volatile storage area uses flash memory, a hard disk, or the like, and is a rewritable storage area that continues to retain data even when the power is turned off. The network I/F unit 105 communicates with the DASH server 400 and streaming server 500 via the network 300.

The browser unit 106 is a browser such as HTML (Hyper Text Markup Language) or BML (Broadcast Markup Language), and controls the display of content acquired via the tuner unit 101 and network I/F unit 105. The DASH player execution unit 107 executes the DASH player and instructs the demultiplexing unit 102 and network I/F unit 105 on the video, audio, and closed captions to be acquired. The DASH player execution unit 107 causes the decoder unit 103 to decode the video, audio, and closed captions acquired via the demultiplexing unit 102 and network I/F unit 105. The decoder unit 103 outputs the video and audio signals generated by decoding the video, audio, and closed captions acquired via the demultiplexing unit 102 and network I/F unit 105 to the display device 600.

Transmitting device 200 includes a content generation unit 201, an SI (Signaling Information) generation unit 202, a multiplexing unit 203, and a sending unit 204. The content generation unit 201 generates content such as video, audio, and closed captions. Note that a DASH player may also be included in the content. The SI generation unit 202 generates control information including update information. For example, the SI generation unit 202 generates control information in MMT-SI format, such as a PLT (Package List Table) or an MPT (MMT (MPEG (Moving Picture Experts Group) Media Transport) Package Table)). The multiplexing unit 203 multiplexes the content generated by the content generation unit 201 and the control information generated by the SI generation unit 202 to generate a single stream. The sending unit 204 converts the stream generated by the multiplexing unit 203 into a television broadcast signal and sends it to receiving device 100.

Figure 2 is a schematic diagram illustrating an example of a television broadcast signal in this embodiment. Each rectangle in Figure 2 represents a packet storing data. Packet V stores encoded video. Packet A stores encoded audio. Packet V stores encoded video. Packet D stores a DASH player. Packet M stores control information such as PLT, MPT, and update information. The television broadcast signal in this embodiment is a stream such as MMT, and as shown in Figure 2, each is composed of packets storing video, audio, a DASH player, control information, etc. Figure 2 shows packets storing video, audio, a DASH player, and control information, but the signal may also include packets storing other data, or may not include packets storing video or audio. Furthermore, the size (duration) of the packets may be the same or different.

In this way, packets containing DASH players are repeatedly distributed at time intervals. For this reason, when receiving device 100 acquires a DASH player from a television broadcast signal, it must wait until the packet containing the DASH player is distributed before it can acquire it. The DASH player may also be divided and stored in multiple packets. In this case, receiving device 100 must wait until all of the multiple packets into which the DASH player has been divided and stored are distributed before it can acquire it. Therefore, in this embodiment, the same DASH player is used across events (programs, content), such as using the same DASH player within a package (channel, service), and once acquired, it is stored in the DASH player storage unit 104.

Figure 3 is a table showing an example of the contents stored in the DASH player storage unit 104 in this embodiment. The DASH player storage unit 104 stores DASH players in association with the package identification (MMT_package_id) and version of the channel that uses that DASH player. In the example of Figure 3, the first line stores package identification "0x010203", version "00011", and DASH player "XXXXXXXXX", while the second line stores package identification "0x010213", version "00005", and DASH player "XXXXXXXXX". In this way, the DASH player storage unit 104 stores DASH players for one or more packages.

Figure 4 is a table showing the configuration of update information in this embodiment. In this embodiment, the update information is an MPEG_DASH_Player_Update_Descriptor. In Figure 4, the Data Structure column shows the names of the data structures that make up the MPEG_DASH_Player_Update descriptor. The Bit Count column shows the number of bits in each data structure. The Data Notation column shows the data notation for each data structure. The data notation "uimsbf" is an abbreviation for "unsigned integer most significant bit first."

As shown in Figure 4, the MPEG_DASH_Player_Update descriptor contains "descriptor_tag", "descriptor_length", "update_time", and "version". "descriptor_tag" indicates that the descriptor is an MPEG_DASH_Player_Update descriptor. "descriptor_length" indicates the length (number of bytes) of the descriptor. "update_time" indicates the time to update the DASH player. Note that "update_time" may only indicate the date and time of the update, and the time may be predetermined, or "update_time" may indicate the time in addition to the date and time. "version" indicates the version number of the updated DASH player.

Note that the number of bits and data notation shown in Figure 4 are merely examples, and other number of bits and data notations may be used. Furthermore, the order of the items included in the MPEG_DASH_Player_Update descriptor is also merely an example, and other orders may be used, or not all items may be included. Note that the update information includes information indicating the channel (package). For example, the MPEG_DASH_Player_Update descriptor may be placed in a table related to a specific package, such as the MPT (MMT Package Table), to indicate that the information is related to the DASH player for that package, or it may be included in another table, with the package identification included in the descriptor.

Figure 5 is a flowchart showing an example of channel scanning processing by the receiving device 100 in this embodiment. Channel scanning is performed when an antenna or the like is connected to the receiving device 100. This channel scanning makes it possible to check which channels of television broadcast signals can be received. In channel scanning, the receiving device 100 first determines whether or not the channel has been detected (step Sa1) for each candidate channel to be scanned based on the installation location, etc. When detecting a channel, for example, the tuner unit 101 receives a signal of the channel's frequency, and the demultiplexing unit 102 determines whether or not it can detect an MMT stream from that signal.

When it is determined in step Sa2 that a channel has been detected (step Sa2-Yes), the demultiplexing unit 102 downloads the DASH player for that channel from the detected MMT stream and stores it in the DASH player storage unit 104 together with the package identification and version of that channel (step Sa3). At this time, the demultiplexing unit 102 uses the DASH player file name to separate the DASH player. The DASH player file name may be common across multiple television broadcasts and may be predetermined. Alternatively, information indicating the DASH player file name for that channel may be included in the control information for that channel, such as the MPT.

If it is determined in step Sa2 that no channel is detected (step Sa2-No), or after step Sa3, while there are candidate channels, the receiving device 100 performs the process from step Sa2 for the next candidate channel, and when all candidate channels have been processed, the channel scan ends (step Sa4).

In this way, when a channel scan is performed, the DASH player for the detected channel is downloaded and stored in the DASH player storage unit 104, i.e., in a non-volatile storage area. This allows the stored DASH player to be used to watch any channel, reducing the time from when the viewer selects a channel to when the content is presented.

Figure 6 is a flowchart showing an example of the DASH player update process performed by the receiving device 100 in this embodiment. First, the receiving device 100 receives and sets update information indicating the update time, version, and channel (step Sb1). This reception is performed by the demultiplexing unit 102 separating and acquiring the MPEG_DASH_Player_Update descriptor from the signal received by the tuner unit 101. Next, the receiving device 100 determines whether the version indicated in the update information is newer (greater) than the DASH player version stored in the DASH player storage unit 104 (step Sb2).

If it is determined that the content is not new (step Sb2 - No), the process returns to step Sb1. If it is determined that the content is new (step Sb2 - Yes), the process waits until the update time indicated by the update information (step Sb3). If viewing is still in progress when the update time arrives, the process waits until viewing ends (step Sb4). The tuner unit 101 receives the signal for the channel indicated by the update information (step Sb5). The demultiplexer unit 102 downloads a DASH player from the signal received by the tuner unit 101 and stores it in the DASH player storage unit 104 together with the package identification and version of that channel (step Sb6). At this time, the demultiplexer unit 102 uses the file name of the DASH player to separate the DASH player, just as in the case of Figure 5. Then, the process returns to step Sb1.

In this way, the receiving device 100 sets the update time indicated in the update information as the update time for the DASH player. Then, when the set time arrives, the tuner unit 101 receives the television broadcast signal, and the demultiplexer unit 102 acquires the DASH player from the signal received by the tuner unit and stores it in the DASH player storage unit 104. As a result, even if the DASH player is updated, the stored DASH player can be used to reduce the time from when the viewer selects a channel to when content is presented.

Figure 7 is a flowchart showing an example of the DASH player update process performed by the transmitting device 200 in this embodiment. The SI generation unit 202 includes update information, including the update time, version, and channel, in the control information. The multiplexing unit 203 generates a stream including this control information. The sending unit 204 converts this stream into a television broadcast signal and sends it out (step Sc1).

The transmitting device 200 continues to send the update information until the update time indicated in the update information arrives. When the update time arrives (step Sc2), the content generating unit 201 generates an updated DASH player. The multiplexing unit 203 then multiplexes the generated DASH player with other content and control information to generate a single stream. The sending unit 204 converts this stream into a television broadcast signal and sends it out (step Sc3).

In this way, the transmitting device 200 transmits update information indicating the update time in advance, and transmits the updated DASH player when the update information arrives. This allows the receiving device 100 to store the DASH player at the update time, so even if the DASH player is updated, the stored DASH player can be used to reduce the time from when the viewer selects a channel to when the content is presented.

Second Embodiment
In the first embodiment, the transmitting device 200 notifies the receiving device 100 of the update time of the DASH player, but in the second embodiment, a case will be described in which the update time is not notified and the receiving device 100 checks for updates at a preset time. In this embodiment, the configuration of the transmitting/receiving system 10 is the same as in Fig. 1 unless otherwise specified. In this embodiment, only the parts that are different from the first embodiment will be described.

Figure 8 is a flowchart showing an example of the DASH player update process performed by the receiving device 100 in this embodiment. The receiving device 100 determines whether a predetermined time, such as 3:00 AM, has arrived (step Sd1). If viewing is still in progress when the predetermined time arrives, the process returns to step Sd1 (step Sd2). If viewing is not in progress, the receiving device 100 determines for each candidate channel (step Sd3) whether the DASH player has been updated (step Sd4). This determination is made, for example, by having the tuner unit 101 receive the television broadcast signal for the channel in question, and the demultiplexer unit 102 separate the information indicating the DASH player version contained in the signal, and compare it with the version stored in the DASH player storage unit 104.

If it is determined that the DASH player has been updated (step Sd4-Yes), the demultiplexing unit 102 downloads the DASH player from the television broadcast signal of the corresponding channel and stores it in the DASH player storage unit 104 (step Sd5). If it is determined that the DASH player has not been updated (step Sd4-No), or after step Sd5, while there are candidate channels, the receiving device 100 performs the processing from step Sd4 onwards for the next candidate channel, and when all candidate channels have been processed, returns to step Sd1 (step Sd6). Note that candidate channels are, for example, channels that have been confirmed to be receivable by a channel scan.

In this way, at the preset time, the tuner unit 101 receives the television broadcast signal, and the demultiplexer unit 102 acquires the DASH player from that signal and stores it in the DASH player storage unit 104. This makes it possible to reduce the time from when the viewer selects a channel to when content is presented, using the stored DASH player, even if the DASH player is updated.

Figure 9 is a flowchart showing an example of the DASH player update process performed by the transmitting device 200 in this embodiment. In the transmitting device 200, on the update date (step Se1), at a predetermined time (step Se2), the content generation unit 201 generates an updated DASH player. Then, the multiplexing unit 203 multiplexes the generated DASH player with other content and control information to generate a single stream. The sending unit 204 converts this stream into a television broadcast signal and sends it out (step Se3).

In this way, the transmitting device 200 sends out the updated DASH player at a specified time on the day the update is made. This allows the receiving device 100 to receive and store the updated DASH player at a specified time, so even if the DASH player is updated, the stored DASH player can be used to reduce the time between when the viewer selects a channel and when the content is presented.

In addition, a program for realizing the functions of receiving device 100 and transmitting device 200 in Figure 1 may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize receiving device 100 and transmitting device 200. Note that the term "computer system" here may be composed of multiple computers and may also include hardware such as an OS and peripheral devices.

In addition, "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into computer systems. Furthermore, "computer-readable recording medium" also includes devices that dynamically store programs for a short period of time, such as communication lines used when transmitting programs over networks like the Internet or communication lines like telephone lines, and devices that store programs for a fixed period of time, such as volatile memory within computer systems that serve as servers or clients in such cases. Furthermore, the above-mentioned programs may be those that implement some of the functions described above, or may be those that can implement the functions described above in combination with programs already stored in the computer system.

Furthermore, each functional block of the receiving device 100 and transmitting device 200 in FIG. 1 may be individually formed into a chip, or some or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Either a hybrid or monolithic method is also acceptable. Some functions may be realized by hardware and some by software.
Furthermore, with the advancement of semiconductor technology, if a technology for integrated circuitry that can replace LSIs emerges, it may be possible to use an integrated circuit based on that technology.

The above describes an embodiment of the present invention in detail with reference to the drawings, but the specific configuration is not limited to this embodiment and includes design modifications and the like that do not deviate from the gist of the present invention.

10...Transmission and Reception System 100...Receiving Device 101...Tuner Unit 102...Demultiplexing Unit 103...Decoder Unit 104...DASH Player Storage Unit 105...Network I/F Unit 106...Browser Unit 107...DASH Player Execution Unit 200...Transmitting Device 201...Content Generation Unit 202...SI Generation Unit 203...Multiplexing Unit 204...Sending Unit 300...Network 400...DASH Server 500...Streaming Server 600...Display Device

Claims (14)

a tuner unit for receiving television broadcast signals;
a demultiplexing unit that obtains the content and a DASH player required for playing the content from the signal;
a DASH player storage unit that stores the DASH player in a non-volatile storage area ;
At the set time, the tuner unit receives the television broadcast signal, the demultiplexer unit acquires a DASH player from the signal, and stores the DASH player in the DASH player storage unit;
the signal includes update information indicating the time;
The demultiplexing unit acquires the DASH player based on the update information and stores it in the DASH player storage unit;
A receiving device , wherein the update information is included in an MPT (MMT Package Table) . The receiving device according to claim 1 , wherein the update information includes information indicating at least a channel of the television broadcast. 3. The receiving device according to claim 1 , wherein the demultiplexing unit acquires the DASH player and stores it in the DASH player storage unit during a channel scan to confirm that the television broadcast signal can be received. The file name of the DASH player is common among a plurality of television broadcasts and is predetermined;
The receiving device according to claim 1 , wherein the demultiplexing unit acquires the DASH player using the file name. control information including information indicating the file name of the DASH player is included in the television broadcast signal;
The receiving device according to claim 1 , wherein the demultiplexing unit acquires the information indicating the file name, and then acquires the DASH player using the file name. a multiplexing unit that multiplexes content and a DASH player required for playback of the content to generate a stream;
a sending unit that converts the stream into a television broadcast signal and sends it out ;
The multiplexing unit also multiplexes update information indicating a time when the receiving device should update the DASH player,
A transmitting device , wherein the update information is included in an MPT (MMT Package Table) . The transmitting device according to claim 6 , wherein the update information includes information indicating at least a channel of the television broadcast. 8. The transmitting device according to claim 6 , wherein the file name of the DASH player is common to a plurality of television broadcasts and is predetermined. 9. The transmitting device according to claim 6 , wherein the multiplexing unit further multiplexes control information including information indicating a file name of the DASH player. A receiving method by a receiving device,
A first step of receiving a television broadcast signal;
a second step of obtaining from said signal a DASH player required for playing the content;
a third step of storing the DASH player in a non-volatile storage area ;
When the set time arrives, the first step to the third step are performed,
the signal includes update information indicating the time;
the second step and the third step are performed based on the update information;
A receiving method in which the update information is included in an MMT Package Table (MPT) . A transmission method by a transmitting device,
multiplexing the content and a DASH player required for playing the content to generate a stream;
and transmitting the stream as a television broadcast signal ,
In the step of generating the stream, update information indicating a time when the receiving device should update the DASH player is also multiplexed;
A transmission method in which the update information is included in an MPT (MMT Package Table) . Computer,
a demultiplexing unit that acquires content and a DASH player required for reproducing the content from a television broadcast signal received by a tuner unit;
a program for causing the DASH player to function as a DASH player storage unit that stores the DASH player in a non-volatile storage area ,
At the set time, the tuner unit receives the television broadcast signal, the demultiplexer unit acquires a DASH player from the signal, and stores the DASH player in the DASH player storage unit;
the signal includes update information indicating the time;
The demultiplexing unit acquires the DASH player based on the update information and stores it in the DASH player storage unit;
The update information is a program included in an MPT (MMT Package Table) . Computer,
a multiplexing unit that multiplexes content and a DASH player required for playback of the content to generate a stream;
a program for causing the stream to function as a sending unit that converts the stream into a television broadcast signal and sends it out ,
The multiplexing unit also multiplexes update information indicating a time when the receiving device should update the DASH player,
The update information is a program included in an MPT (MMT Package Table) . A transmitting/receiving system comprising: a receiving device according to any one of claims 1 to 5 ; and a transmitting device according to any one of claims 6 to 9 .