JP2019154034A - Receiver and program - Google Patents

Abstract

To provide a receiver and a program which allow for mapping of application control information and broadcast service.SOLUTION: A broadcast signal analysis unit extracts control information belonging to a package corresponding to a selected broadcast service, from a broadcast signal received by a broadcast reception unit, and acquires application information table location information contained in the control information. An application information table acquisition unit acquires an application information table, pointed by the application information table location information acquired by the broadcast signal analysis unit. An application execution control unit controls execution, in an application execution unit, of an application associated with a broadcast service selected according to the application information table, acquired by the application information table acquisition unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a receiver and a program. In particular, the present invention relates to a receiver for receiving a television broadcast and a program thereof.

  Information for controlling an application running on the receiver side that receives the television broadcast may be sent from the broadcast station side. In some cases, the life cycle of an application (broadcast managed application) is controlled in a form bound to a service currently being received (viewed) on the receiver side. In the existing technology, an AIT (application information table) is included in a broadcast signal and transmitted from the broadcast station side, the AIT is acquired from the broadcast signal on the receiver side, and execution of the application is controlled according to the description in the AIT. Is called.

  Non-Patent Document 1, “10.16 Application Information Coding Method” (p.54-73) describes the configuration of the AIT (application information table) and each descriptor in the AIT.

“Application Execution Environment in Digital Broadcasting Standards APPLICATION EXECUTION ENGINE PLATFORM FOR DIGITAL BROADCASTING ARIB STANDARD ARIB STD-B23 1.2 Edition”, July 29, 2009, Japan Radio Industry Association

  However, in the configuration of application control information according to the existing technology, there is a problem that application attribute information and control information defined in the AIT cannot be mapped to a service representing a broadcast channel when a plurality of services are transmitted simultaneously. If the application control information acquired on the receiver side should be associated with one of multiple services, it is clear which specific service the application control information corresponds to It is necessary to.

  The present invention has been made based on the above problem recognition, and provides a receiver and a program that enable mapping between application control information and a broadcast service.

  [1] In order to solve the above-described problem, a receiver according to an aspect of the present invention provides a broadcast receiving unit that receives a broadcast signal and a broadcast service selected from the broadcast signal received by the broadcast receiving unit. By extracting the control information belonging to the corresponding package and acquiring the application information table location information included in the control information, and the application information table location information acquired by the broadcast signal analysis unit An application information table acquisition unit that acquires the indicated application information table, an application execution unit that executes an application, and a broadcast service selected according to the application information table acquired by the application information table acquisition unit Characterized by comprising been the application execution control unit for controlling the execution of the application executing section of the Application, the.

  With this configuration, the broadcast signal analysis unit extracts control information corresponding to the selected service. The control information belongs to the service (package). Then, the broadcast signal analysis unit acquires application information table location information included in the control information. That is, this application information table location information belongs to the service. The application information table location information is information regarding the location (location) of the application information table. That is, the application information table specified by the location information belongs to the service (package). Therefore, the application execution control unit controls the execution of the application based on the application information table belonging to the service (package). In this way, the receiver can control the execution of the application based on the information mapped from the service (package).

  [2] Further, according to an aspect of the present invention, in the receiver, the broadcast signal analysis unit further acquires data transmission message location information included in the control information belonging to the package. Features.

  [3] Further, according to one aspect of the present invention, in the receiver, the broadcast signal analysis unit further acquires event message table location information included in the control information belonging to the package. Features.

  [4] Further, according to one aspect of the present invention, in the receiver, the broadcast signal analysis unit acquires the application information table location information held in the MMT package table for the package. And

  [5] In addition, according to one aspect of the present invention, in the above receiver, a plurality of pieces of the application information table location information are included in the control information.

  [6] Further, according to one aspect of the present invention, the control information belonging to the package corresponding to the selected broadcast service is extracted from the broadcast signal received by the broadcast receiving unit, and the application included in the control information Broadcast signal analysis means for acquiring information table location information, application information table acquisition means for acquiring an application information table indicated by the application information table location information acquired by the broadcast signal analysis means, and the application information table acquisition unit A computer as an application execution control means for controlling execution in an application execution means of an application associated with a broadcast service selected according to the acquired application information table Is a program to function.

  According to the present invention, it is possible to map the acquired application control information to a specific service. Even when multi-organized broadcasting is performed, it is possible to automatically start by specifying different applications for each service.

It is a block diagram which shows schematic function structure of the receiver by 1st Embodiment of this invention. It is the schematic which shows the relationship of the table etc. which the broadcast signal analysis part by the same embodiment extracts. The relationship between MPT and AIT, DTM, and EMT is shown. It is the schematic which shows the structure of each location information of AIT, DTM, and EMT contained in MPT by the embodiment, and shows the structure of the application control descriptor contained in the descriptor area | region in MPT. It is a schematic block diagram which shows the structure of the television system containing the receiver by the same embodiment. It is a block diagram which shows the schematic function structure of the transmitter by the embodiment. It is the schematic which shows the structure of the application control descriptor by 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following description or in the drawings, an application program may be abbreviated as “application” or “application”.

[First Embodiment]
FIG. 1 is a block diagram showing a schematic functional configuration of a receiver according to the present embodiment. As illustrated, the receiver 1 includes a broadcast receiving unit 11, a broadcast signal analyzing unit 12, an AIT acquisition unit 14, a communication transmitting / receiving unit 15, an application execution control unit 16, and an application execution unit 17. Composed.
Note that the receiver 1 is a so-called television and has a function of presenting broadcast content such as video and audio included in a broadcast signal. Here, only functions directly related to the present invention will be described. Description of other functions is omitted.

  The broadcast receiving unit 11 receives an external broadcast signal. The broadcast signal received by the broadcast receiving unit 11 is a signal in which control information is multiplexed together with video, audio, and data information. In the present embodiment, this broadcast signal is transmitted by the MMT (MPEG Media Transport) system. The broadcast signal received by the broadcast receiver 11 includes MPT (MMT Package Table), AIT (Application Information Table), DTM (Data Transmission Message), and the like. ing. The DTM is a message that stores a table related to data transmission. The broadcast signal may include an application code for operating on the receiver 1. The broadcast receiver 11 demodulates the received broadcast signal and passes it to the broadcast signal analyzer 12.

  The broadcast signal analysis unit 12 analyzes the broadcast signal delivered from the broadcast reception unit 11 and separates and extracts necessary information. Specifically, the broadcast signal analysis unit 12 extracts video signals, audio signals, data, and control information, and supplies these signals to each unit. When the application code is included in the signal extracted by the broadcast signal analysis unit 12, the broadcast signal analysis unit 12 passes the extracted code to the application execution unit 17.

  Also, the broadcast signal analysis unit 12 extracts control information belonging to a package corresponding to the selected broadcast service from the broadcast signal, and acquires application information table location information included in the control information. Further, the broadcast signal analysis unit 12 acquires data transmission message location information included in the control information. Further, the broadcast signal analysis unit 12 acquires event message table location information included in the control information. Here, a part of the control information is the MPT described above. As will be described later, the MPT includes location information of an application information table, location information of a data transmission message, and location information of an event message table.

  The receiver 1 includes a channel selection unit (not shown). The receiver 1 selects (selects) a broadcast service based on a signal from a remote controller or the like operated by a user. Information for identifying the service currently selected in the receiver 1 is supplied to necessary functional units in the receiver 1. The MPT referred to by the broadcast signal analysis unit 12 in the above process is an MPT belonging to the currently selected service (package). Even when a plurality of services (packages) are present in the same transmission band (multi organization), MPT exists for each package. That is, one MPT is unique for a specific package.

  The AIT acquisition unit 14 (application information table acquisition unit) acquires the AIT indicated by the AIT location information extracted by the broadcast signal analysis unit 12. Then, the AIT acquisition unit 14 passes information for controlling the application to the application execution control unit 16. A typical example of information for controlling an application is an application control code, and this information is used to control the life cycle (prefetch, executable, automatic execution, termination, etc.) of the application.

  The communication transmitter / receiver 15 has a communication function for exchanging data with the outside by communication. The communication transmitting / receiving unit 15 performs communication with an external device using, for example, the Internet protocol (IP). For example, based on an instruction from the AIT acquisition unit 14 or the like, the communication transmission / reception unit 15 requests an external server device for a necessary application code, and acquires the code.

The application execution control unit 16 (application execution control unit) controls application execution in the application execution unit 17. Specifically, the application execution control unit 16 instructs the application execution unit 17 to start an application or instructs the application execution unit 17 to end the application. At this time, the application execution control unit 16 controls the execution of the application according to the AIT information passed from the AIT acquisition unit 14.
That is, the application execution control unit 16 controls execution of the application associated with the broadcast service selected at that time in the application execution unit 17 according to the application information table acquired by the AIT acquisition unit 14.

  The application execution unit 17 (application execution unit) executes the application under the control of the application execution control unit 16. As an example, the application execution unit 17 is realized by a browser function of HTML5. In this case, the application is a code described by HTML5 and Javascript (registered trademark). The application execution unit 17 may be realized by other means. The application execution unit 17 includes a cache memory for storing application code. The application execution unit 17 stores the application code received from the broadcast signal analysis unit 12 or the communication transmission / reception unit 15 in this cache memory.

Next, association between a package transmitted as a broadcast signal and a broadcast managed application belonging to the package will be described.
FIG. 2 is a schematic diagram showing a part of a relationship such as a table received by the broadcast receiving unit 11 and extracted by the broadcast signal analyzing unit 12. MPT, AIT, DTM, and EMT (Event Message Table) shown in the figure are included in the broadcast signal and transmitted. The MPT according to the present embodiment stores location information indicating the location (location) of the AIT, DTM, or EMT. As shown in the figure, MPT holds one location information for each of AIT and DTM. The MPT holds a plurality of necessary EMT location information. Details of the location information will be described later.

  Here, MPT is a table that exists for each package. One package corresponds to one service. Here, the service is a television program. When a so-called multi-organization broadcast in which a plurality of packages are transmitted in one common band is performed, another MPT is transmitted for each package. Therefore, when the receiver 1 receives the illustrated MPT, the broadcast signal analysis unit 12 can extract the AIT in a form associated with the MPT. Similarly, the broadcast signal analysis unit 12 can extract the DTM in a form associated with the MPT. Similarly, the broadcast signal analysis unit 12 can extract a plurality of EMTs in a form associated with the MPT.

  FIG. 3 is a schematic diagram showing a configuration of location information of AIT, DTM, and EMT included in the MPT described above. This figure shows the data structure, the number of bits of each data item included in the data structure, and the data notation. This data structure is defined by a formal language having a block structure. The number of bits is the length (bit length) of the data item included in the data structure. The data notation represents the type of each data item. “Uimsbf” in this data notation represents “unsigned integer, most significant bit first”, that is, an unsigned integer and the most significant bit is first.

  The entire structure shown in the figure is an Application Control Descriptor. This application control descriptor is provided in the first descriptor area (MPT_descriptors_byte) in the MPT. That is, the application control descriptor is a descriptor provided in one-to-one correspondence with the package (service), and is not an attribute for each asset in the package. Each data item in the application control descriptor is as follows (1) to (6).

(1) descriptor_tag (descriptor tag) is information for identifying a descriptor. The value of the descriptor tag for the application control descriptor is determined as appropriate. The bit length of the descriptor tag is “16” in the present embodiment. The bit length of the descriptor tag may vary depending on the media transport system used.
(2) The descriptor_length (descriptor length) is an area that holds the total number of data bytes in subsequent fields (from ait_location_info to the end of the private_data_byte loop) in the application control descriptor. The bit length of the descriptor length field in the application control descriptor is “8”. The bit length of the descriptor length field in other descriptors may be other than “8”.
(3) ait_location_info () (AIT location information) is location information of the M2 section message storing the application information table (AIT).

(4) dtm_location_info () (data transmission message (DTM) location information) is location information of the data transmission message.
(5) num_of_emt (EMT number) indicates the number of event message tables (EMT).
The number of loops of the next data item emt_location_info () is defined by this num_of_emt.
(6) emt_location_info () (event message table (EMT) location information) is the location of the M2 section message that stores the event message table (EMT).

Each of the above ait_location_info (), dtm_location_info (), and emt_location_info () is a structure having a type of MMT_general_location_info (). The specific entity of MMT_general_location_info () is specified in the rules as appropriate. For example, MMT_general_location_info () includes a data item called location_type for identifying the type of location, and holds different data according to this type. Specific information held by MMT_general_location_info () includes, for example, a packet ID, a combination of an address, a port number, and a packet ID (packet identification) in an Internet protocol (IPV4 or IPV6), a network ID, and an MPEG2 transport stream ID. And a combination of MPEG2 PID and URL.
As an example, a packet ID is stored in each of the above ait_location_info (), dtm_location_info (), and emt_location_info () as an entity of location information. However, location information other than the packet ID may be used.

  As shown in the figure, one AIT location information and one data transmission message (DTM) location information can be specified for each package. In addition, a plurality of event message table (EMT) location information can be specified for one package.

By referring to the above application control descriptor, the receiver 1 operates as follows. That is, the broadcast signal analysis unit 12 acquires an MPT in which package information is stored.
Further, the broadcast signal analysis unit 12 acquires AIT location information, DTM location information, and EMT location information by referring to the application control descriptor in the MPT. Each piece of location information is data of the MMT_general_location_info () type described above. Therefore, the broadcast signal analysis unit 12 knows the locations of the AIT, DTM, and EMT from each location information. And based on these location information, the broadcast signal analysis part 12 can specify and acquire AIT, DTM, and EMT linked | related with the said package.

The AIT acquisition unit 14 acquires an AIT associated with a specific package (for example, a package (service) currently being viewed by the user of the receiver 1) from the broadcast signal analysis unit 12.
Based on the information described in the AIT, the AIT acquisition unit 14 instructs the application code to be acquired via the broadcast reception unit 11 or the communication transmission / reception unit 15 in a necessary situation. In addition, the AIT acquisition unit 14 passes the acquired AIT to the application execution control unit 16. The application execution control unit 16 performs life cycle control of an application associated with a specific package according to the passed AIT. That is, the application execution control unit 16 makes the application operable (READY), automatically starts, or forcibly terminates (KILL).

Next, a television system including the receiver 1 will be described.
FIG. 4 is a schematic configuration diagram showing a configuration of a television system including the receiver 1 described above. As illustrated, the television system 100 includes a transmission device 3, a server device 5, and a receiver 1.

  The transmission device 3 transmits a broadcast signal. Broadcast signals transmitted by the transmission device 3 include video data (video assets), audio data (audio assets), subtitle text data (caption assets), text super text data (character super assets), And control information data. The transmission device 3 transmits various assets and control information as a logically grouped signal for each package. The transmission device 3 may transmit a plurality of packages as transmission signals within one band. For example, in the case of multi-organization, the transmission device 3 transmits a plurality of packages in parallel.

  As part of the data of the control information, the above-described MPT, AIT, DTM, EMT, and the like associated with the location information in the MPT are also included. The broadcast signal transmitted by the transmitter 3 is transmitted by radio (terrestrial wave or satellite broadcast wave) or wired (television broadcast cable).

  The server device 5 provides an application program in response to a request from the receiver 1. The server device 5 is connected to the receiver 1 via a communication network, and can receive data from the receiver 1 and transmit data to the receiver 1.

  The receiver 1 receives a broadcast signal from the transmission device 3 and performs communication with the server device 5. The receiver 1 receives the application program from the server device 5 in accordance with the AIT included in the broadcast signal from the transmission device 3. The receiver 1 controls the execution of the application according to the received application control code in the AIT. That is, the receiver 1 performs control such that the application can be activated, activated, or terminated according to the received application control code in the AIT.

Thus, for example, even in a situation such as multi-organization, the receiver 1 acquires an MPT related to a specific package and an AIT, DTM, and EMT associated with the MPT. Then, the receiver 1 performs life cycle control of an application (broadcast managed application) or real-time control in accordance with the AIT associated with the specific package.
That is, the package (service) and AIT, DTM, and EMT can be mapped.

  FIG. 5 is a block diagram illustrating a schematic functional configuration of the transmission device 3. As illustrated, the transmission device 3 includes a video signal acquisition unit 31, an audio signal acquisition unit 32, a data acquisition unit 33, a control information setting unit 34, a multiplexing unit 37, and a broadcast transmission unit 38. Consists of. The control information setting unit 34 includes an application control information setting unit 36 therein.

The video signal acquisition unit 31 acquires the video signal of the content from the outside, encodes it, and passes it to the multiplexing unit 37.
The audio signal acquisition unit 32 acquires the audio signal of the content from the outside, encodes it, and passes it to the multiplexing unit 37.
The data acquisition unit 33 acquires data associated with the service from the outside and passes the data to the multiplexing unit 37.

The control information setting unit 34 sets control information related to the service and passes it to the multiplexing unit 37. Here, the control information set by the control information setting unit 34 includes the above-described MPT, AIT, DTM, and EMT tables and message information. The control information setting unit 34 also sets other control information necessary as a broadcast signal and passes it to the multiplexing unit 37.
The control information setting unit 34 includes an application control information setting unit 36 as a part of the function for setting control information. The control information set by the control information setting unit 34 satisfies the requirements described with reference to FIGS. That is, the control information set by the control information setting unit 34 includes AIT location information, DTM location information, EMT location information, etc. in the MPT for each package. Specifically, in the control information set by the control information setting unit 34, the MPT includes the application control descriptor described with reference to FIG. The control information setting unit 34 associates MPT with AIT, DTM, and EMT based on a predetermined relationship.

The application control information setting unit 36 sets information for controlling the application. Specifically, the application control information setting unit 36 sets AIT information.
The multiplexing unit 37 multiplexes each received data.
The broadcast transmission unit 38 modulates the data multiplexed by the multiplexing unit 37 and transmits it as a broadcast signal.

  Next, an example of program transmission by the transmission device 3 will be described. The transmission device 3 may transmit broadcast content in multiple organizations. According to multi-organization, a plurality of programs can be broadcast on one channel. As an example, when broadcasting two programs (two services, two packages) on one channel, the main channel and subchannel of that channel are used. Each of these main channel and sub-channel is a service. For example, the transmission device 3 transmits one wave of so-called 8K television (horizontal 7680 pixels and vertical 4320 pixels) and one 4K television (horizontal 3840 pixels and vertical 2160 pixels). And can be switched. At this time, the capacity of the channel used for transmission can accommodate transmission data in any case.

  As described above, according to the present embodiment, services (packages) and applications can be mapped. That is, in this embodiment, the broadcast signal analysis unit 12 refers to various location information stored in the MPT belonging to the package (the package selected at that time). Thereby, the broadcast signal analysis unit 12 knows the location of the AIT, the location of the DTM, and the location of the EMT. Therefore, the broadcast signal analysis unit 12 can use AIT, DTM, and EMT mapped from a specific package, and can supply such information to necessary functional units in the receiver 1.

  That is, even in a multi-organization situation, AIT, DTM, and EMT associated with a specific package can be specified. An application can be controlled using such an AIT.

  Moreover, according to this embodiment, it is not necessary to include new data in the AIT. Therefore, it is not necessary to change the format of the AIT for the implementation of this embodiment. Accordingly, there is also an advantage that it is not necessary to change the design of the receiver on the premise of the AIT according to the conventional technology.

  In addition, according to the present embodiment, the location information of each of AIT, DTM, and EMT is held in the MPT in the form of MMT_general_location_info (). Therefore, versatility can be given to the expression format of location information.

[Configuration example of 8K1 wave (1 service)]
Here, a configuration example of an 8K1 wave (one service) broadcast signal will be described. Broadcast signals are multiplexed by the MMT (MPEG Media Transport) method. One service (package) is included in this IP data flow. The service consists of one video asset (Video 1 Asset), one audio asset (Audio 1 Asset), and two data assets (Data 1 Asset). Asset) and Data 2 Asset). Video 1 asset is an 8K video. This IP data flow includes two PA messages (Package Access message). Each PA message stores an MPT (MMT Package Table). The MPT of each PA message stores a service ID (= package ID). The values of those service IDs are “1” and “2”, respectively. Both MPTs point to the same package. That is, each of the MPTs has a link to the video 1 asset, a link to the audio 1 asset, a link to the data 1 asset, and a link to the data 2 asset. A PLT (Package List Table) is provided in the first PA message. From this PLT, the second PA message is pointed.

  When the broadcast signal transmitted from the transmission apparatus 3 has the above-described configuration, the receiver 1 that receives the broadcast signal has the service “1” selected and the service “2” selected. Also, the same content is referred to and the content (video, audio, data) is presented to the user of the receiver 1.

[Configuration example of 4K2 waves (2 services)]
Next, a configuration example of a broadcast signal of 4K2 waves (2 services) will be described. In this example, the MMT method is also used. Two services (packages) are included in this IP data flow. The first service includes one video asset (video 1 asset), one audio asset (audio 1 asset), and two data assets (data 1 asset and data 2 asset). Video 1 asset is a 4K video. The second service includes one video asset (video 2 asset), one audio asset (audio 2 asset), and one data asset (data 3 asset). Video 2 asset is also a 4K video. The IP data flow includes two PA messages. Each PA message stores an MPT. The MPT in the first service holds the package ID “1”, and the MPT in the second service holds the package ID “2”.
These two MPTs indicate the assets (video asset, audio asset, data asset) of each package. That is, the MPT in the first service has a link to the video 1 asset, a link to the audio 1 asset, a link to the data 1 asset, and a link to the data 2 asset. The MPT in the second service has a link to the video 2 asset, a link to the audio 2 asset, and a link to the data 3 asset. A PLT is provided in the first PA message. From this PLT, the second PA message is pointed.

  When the broadcast signal transmitted from the transmission device 3 has the above-described configuration, the receiver 1 that receives the broadcast signal selects an MPT whose package ID is “1” when the service “1” is selected. Each asset is accessed based on the service, and when the service “2” is selected, each asset is accessed based on the MPT whose package ID is “2”. Then, the receiver 1 presents the acquired content (video, audio, data) to the user.

[Second Embodiment]
Next, a second embodiment will be described. Note that drawings and descriptions of items similar to those of the above-described embodiment are omitted, and items specific to the present embodiment are mainly described.
The schematic functional configurations of the receiver 1 and the transmission device 3 in this embodiment are as described with reference to FIGS.
In the present embodiment, the format of a part of the control information included in the broadcast signal transmitted from the transmission device 3 to the receiver 1 is different from that in the above-described embodiment.

FIG. 6 is a schematic diagram showing the configuration of the application control descriptor in the present embodiment.
As in the case of the first embodiment, this application control descriptor stores location information of AIT, DTM, and EMT. The application control descriptor is provided in the first descriptor area in the MPT.
Each data item in the application control descriptor is as follows (1) to (6).

(1) descriptor_tag (descriptor tag) is information for identifying a descriptor and is the same as the descriptor tag in the first embodiment.
(2) descriptor_length (descriptor length) is data representing the size of the application control descriptor, and is the same as the descriptor length in the first embodiment.
(3) ait_packet_id (AIT packet identification) indicates the packet identification of the M2 section message storing the application information table (AIT). ait_packet_id is 16-bit data. This ait_packet_id points to the location of the AIT linked to the MPT.

(4) dtm_packet_id (data transmission message packet identification) indicates the packet identification of the data transmission message (DTM). dtm_packet_id is 16-bit data. This dtm_packet_id points to the location of the DTM linked to the MPT.
(5) num_of_emt (EMT number) is 8-bit data indicating the number of event message tables (EMT). The number of loops of the next data item emt_location_id is defined by this num_of_emt.
(6) emt_packet_id (event message table packet identification) indicates the packet identification of the M2 section message storing the event message table (EMT). emt_packet_id is 16-bit data. This emt_packet_id points to the location of the EMT linked to the MPT.

  As shown in the figure, one AIT location information and one data transmission message (DTM) location information can be specified for each package. In addition, a plurality of event message table (EMT) location information can be specified for one package.

  The receiver 1 that has received the MPT uses the AIT location information, the data transmission message location information, and the event message table location information described above to refer to the indicated table and the like, as in the first embodiment. . Thereby, also in this embodiment, it becomes possible to perform mapping from MPT to AIT, DTM, and EMT for a specific package. Note that the content of processing based on the acquired AIT, DTM, and EMT on the receiver 1 side is the same as in the first embodiment. That is, similarly to the first embodiment, the receiver 1 can perform life cycle control of the application associated with the package, acquisition of the application, and real-time control of the application.

  In this embodiment, since the fixed 16-bit packet ID is used as the location information to be used instead of MMT_general_location_info (), it is not necessary to determine the type of location information. Further, the size of the area occupied by the location information in the MPT can be reduced.

[Third Embodiment]
Next, a third embodiment will be described. Note that, with respect to the same matters as those in the first embodiment or the second embodiment described above, the drawings and the explanation are omitted, and the items peculiar to the present embodiment are mainly explained.
The schematic functional configurations of the receiver 1 and the transmission device 3 in this embodiment are as described with reference to FIGS.

In each of the first embodiment and the second embodiment described above, MPT is a set of one AIT location information, one DTM location information, and one or a plurality of EMT location information. One set of such information was retained.
In contrast, in this embodiment, one MPT holds a plurality of sets of one AIT location information, one DTM location information, and one or a plurality of EMT location information. .

A specific configuration of the MPT in this embodiment will be described.
The MPT in the first embodiment is as shown in FIG. In this embodiment, the MPT shown in FIG. 3 is extended. Specifically, in FIG. 3, a loop from ait_location_info () to emt_location_info () (until the end of the block by the for syntax) appears only once in one application control descriptor. In the present embodiment, the entire process from the ait_location_info () to the emt_location_info () loop is repeated a plurality of times in a larger loop. A data item indicating the number of repetitions is provided immediately after descriptor_length.

  Instead of the MPT shown in FIG. 3, the MPT of the second embodiment shown in FIG. 6 may be extended. In this case, specifically, the entire loop from ait_packet_id to emt_packet_id () in FIG. 6 (until the end of the block by the for syntax) is repeated a plurality of times in a larger loop. A data item indicating the number of repetitions is provided immediately after descriptor_length.

  As described above, a plurality of sets of one AIT location information, one DTM location information, and one or a plurality of EMT location information are held in the MPT and transmitted from the transmission apparatus 3 side. That is, in the MPT, a plurality of application information table location information and the like are included. On the receiver 1 side that receives a broadcast signal including such MPT, an application can be selected by appropriately selecting a set of location information. Can be controlled by a plurality of control patterns. As an example, when a national television program is transmitted from a broadcasting station provided in each region, an application or application group corresponding to the national broadcasting and an application corresponding to each region (for example, each broadcasting station) or The application group can be controlled by separate AIT or the like.

  Further, flag information indicating which default set is a plurality of sets of AIT location information, DTM location information, and EMT location information in the MPT may be further provided in the MPT. At this time, the receiver 1 refers to a set indicated by this flag among a plurality of sets of location information as default location information.

  In addition, you may make it implement | achieve the function of the receiver in each embodiment mentioned above, a transmission apparatus, and a server apparatus with a computer. In that case, the program for realizing the functions of these devices may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed. . Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, a “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included, and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions in combination with a program already recorded in a computer system.

Although a plurality of embodiments have been described above, the present invention can also be implemented in the following modifications.
For example, AIT location information, DTM location information, and part of EMT location information may be included in another descriptor. Moreover, all these three parties may be included in different descriptors.
Further, AIT location information, DTM location information, and EMT location information may be held in locations other than the descriptor area in the MPT.
In any case, if the location information of AIT, DTM, and EMT is included in the control information belonging to the package, the package and these tables can be mapped.
As a modification of the third embodiment, if a plurality of (a necessary number of sets) of AIT location information, DTM location information, and EMT location information are included in the MPT, those in the table The specific arrangement order and the like may be appropriately determined by design.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  The present invention can be used for a television broadcasting system (receiver, transmitter).

DESCRIPTION OF SYMBOLS 1 Receiver 3 Transmission apparatus 5 Server apparatus 11 Broadcast receiving part 12 Broadcast signal analysis part 14 AIT acquisition part (application information table acquisition part)
15 Communication transceiver 16 Application execution controller (application execution controller)
17 Application execution part (application execution part)
31 Video signal acquisition unit 32 Audio signal acquisition unit 33 Data acquisition unit 34 Control information setting unit 36 Application control information setting unit 37 Multiplexing unit 38 Broadcast transmission unit 100 Television system

Claims (2)

A broadcast receiver for receiving broadcast signals;
A descriptor included in control information belonging to a package corresponding to the selected broadcast service is extracted from the broadcast signal received by the broadcast receiver, and application information table location information included in the descriptor; A broadcast signal analysis unit for obtaining data transmission message location information included in the descriptor and event message table location information included in the descriptor;
An application information table acquisition unit for acquiring an application information table indicated by the application information table location information acquired by the broadcast signal analysis unit;
An application execution unit for executing the application;
An application execution control unit that controls execution in the application execution unit of an application associated with a broadcast service selected according to the application information table acquired by the application information table acquisition unit;
Comprising
The broadcast signal analyzing unit obtains the application information table location information included in the descriptor held in the MMT package table for the package,
The MMT package table includes a plurality of pieces of the application information table location information.
A receiver characterized by that. From the broadcast signal received by the broadcast receiver, extract a descriptor included in the control information belonging to the package corresponding to the selected broadcast service, application information table location information included in the descriptor, and Broadcast signal analysis means for acquiring data transmission message location information included in the descriptor and event message table location information included in the descriptor;
Application information table acquisition means for acquiring an application information table indicated by the application information table location information acquired by the broadcast signal analysis means;
Application execution control means for controlling execution in the application execution means of an application associated with the broadcast service selected according to the application information table acquired by the application information table acquisition means;
As a program that allows a computer to function as
The broadcast signal analyzing unit obtains the application information table location information included in the descriptor held in the MMT package table for the package,
The MMT package table includes a plurality of pieces of the application information table location information.
program.

Images