JP6726783B2 - Receiver and program - Google Patents

Description

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

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

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

"Application EXECUTION ENGINE PLATFORM FOR DIGITAL BROADCASTING ARIB STANDARD ARIB STD-B23 1.2 version", July 29, 2009, Japan Association of Radio Industries and Businesses

However, the configuration of the application control information according to the existing technology has a problem that the attribute information and control information of the application defined in the AIT cannot be mapped to the service representing the broadcast channel when a plurality of services are simultaneously transmitted. If the application control information acquired at the receiver side should be associated with any one of multiple services, clarify which particular service the application control information corresponds to. Need to

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

[1] To solve the above problems, a receiver according to an aspect of the present invention provides a broadcast service selected from a broadcast receiving unit that receives a broadcast signal and the broadcast signal received by the broadcast receiving unit. A broadcast signal analysis unit that extracts control information belonging to a corresponding package and obtains application information table location information included in the control information, and the application information table location information obtained 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 that is selected according to the application information table acquired by the application information table acquisition unit. And an application execution control unit that controls the execution of the application in the application execution unit.

With this configuration, the broadcast signal analysis unit extracts the control information corresponding to the selected service. The control information belongs to the service (package). Then, the broadcast signal analysis unit acquires the 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 above receiver, the broadcast signal analysis unit further acquires data transmission message location information included in the control information belonging to the package. Characterize.

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

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

[5] Another aspect of the present invention is characterized in that, in the above receiver, the control information includes a plurality of pieces of application information table location information.

[6] Further, according to an aspect of the present invention, control information belonging to a package corresponding to a selected broadcast service is extracted from a broadcast signal received by a broadcast receiving unit, and the application is included in the control information. An information table location information acquiring unit, a broadcast signal analyzing unit, an application information table acquiring unit that acquires an application information table indicated by the application information table location information acquired by the broadcasting signal analyzing unit, and the application information table acquiring unit. It is a program that causes a computer to function as an application execution control unit that controls execution of an application associated with a broadcasting service selected according to the acquired application information table in an application execution unit.

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

It is a block diagram which shows schematic functional structure of the receiver by 1st Embodiment of this invention. It is a schematic diagram showing a relation of a table etc. which a broadcast signal analysis part extracts by the embodiment. The relationship between MPT and AIT, DTM or EMT is shown. It is a schematic diagram showing composition of each location information of AIT, DTM, and EMT contained in MPT by the embodiment, and shows composition of an application control descriptor contained in a descriptor field in MPT. It is a schematic block diagram which shows the structure of the television system containing a receiver by the same embodiment. FIG. 3 is a block diagram showing a schematic functional configuration of a transmission device according to the same embodiment. It is a schematic diagram showing the composition of the application control descriptor by a 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 “app”.

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

The broadcast receiving unit 11 receives a broadcast signal from the outside. 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 this embodiment, the broadcast signal is transmitted by the MMT (MPEG Media Transport) method. The broadcast signal received by the broadcast receiver 11 also 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. In addition, the broadcast signal may include a code of an application to be run on the receiver 1. The broadcast receiving unit 11 demodulates the received broadcast signal and transfers it to the broadcast signal analyzing unit 12.

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

Further, 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. Also, the broadcast signal analysis unit 12 acquires the data transmission message location information included in the control information. The broadcast signal analysis unit 12 also acquires the event message table location information included in the control information. Here, a part of the control information is the MPT described above. Further, 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 tuning unit (not shown). The receiver 1 selects (selects) a broadcast service based on a signal from a remote control device 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. In the above process, the MPT referred to by the broadcast signal analysis unit 12 is the MPT belonging to the currently selected service (package). Even when a plurality of services (packages) exist in the same transmission band (multi-composition), MPT exists for each package. That is, one MPT is unique for a particular 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 the information for controlling the application to the application execution control unit 16. A typical example of information for controlling an application is application control code, and this information is used for controlling the life cycle (prefetch, executable, automatic execution, termination, etc.) of the application.

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

The application execution control unit 16 (application execution control unit) controls the execution of the application in the application execution unit 17. Specifically, the application execution control unit 16 instructs the application execution unit 17 to start an application or give an instruction to terminate 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 the execution of the application associated with the broadcasting 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 the function of the HTML5 browser. In this case, the application is a code written in HTML5 and Javascript (registered trademark). The application executing unit 17 may be realized by other means. The application executing 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 and 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 the relationship of the table and the like received by the broadcast receiving unit 11 and extracted by the broadcast signal analyzing unit 12. The 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 AIT, DTM, or EMT. As illustrated, the MPT holds one piece of location information for each of the AIT and DTM. Further, the MPT holds a plurality of necessary pieces of EMT location information. The 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. In addition, the service here is a television program. Then, when broadcasting by so-called multi-composition in which a plurality of packages is transmitted in one common band, 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 each of the 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 above-mentioned MPT. In the figure, the data structure, the number of bits of each data item included in the data structure, and the data notation are shown. 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 indicates the type of each data item. In this data notation, "uimsbf" represents "unsigned integer, most significant bit first", that is, an unsigned integer and the most significant bit is at the beginning.

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. The data items in the application control descriptor are as follows (1) to (6).

(1) descriptor_tag (descriptor tag) is information for identifying the descriptor. The value of the descriptor tag for the application control descriptor is set appropriately. The bit length of the descriptor tag is “16” in this embodiment. The bit length of the descriptor tag may differ depending on the media transport system used.
(2) descriptor_length (descriptor length) is an area that holds the total number of data bytes of the 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 that stores 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 (number of EMTs) indicates the number of event message tables (EMTs).
The number of loops of the next data item, emt_location_info(), is specified 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).

Note that each of the above ait_location_info(), dtm_location_info(), and emt_location_info() is itself a structure having a type of MMT_general_location_info(). The specific substance of MMT_general_location_info() is appropriately specified in the rules and the like. For example, MMT_general_location_info() includes a data item called location_type for identifying the type of location, and holds different data depending on this type. Specific information held by MMT_general_location_info() is, for example, a packet ID, a combination of an address and a port number and a packet ID (packet identification) in the Internet protocol (IPV4 or IPV6), a network ID and an MPEG2 transport stream ID. And a MPEG2 PID, a URL, and the like.
As an example, the packet ID is stored as the location information entity in each of the ait_location_info(), dtm_location_info(), and emt_location_info(). 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 designated for one package. Further, a plurality of event message table (EMT) location information can be designated for one package.

By referring to the application control descriptor described above, the receiver 1 operates as follows. That is, the broadcast signal analysis unit 12 acquires the MPT in which the package information is stored.
The broadcast signal analysis unit 12 also acquires the AIT location information, the DTM location information, and the EMT location information by referring to the application control descriptor in the MPT. The location information of each of them is the data having 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 the location information. Then, based on the location information, the broadcast signal analysis unit 12 can specify and acquire the AIT, DTM, and EMT associated with the package.

The AIT acquisition unit 14 acquires, from the broadcast signal analysis unit 12, an AIT associated with a specific package (for example, a package (service) currently being viewed by the user of the receiver 1).
Then, based on the information described in the AIT, the AIT acquisition unit 14 gives an instruction to acquire the code of the application via the broadcast receiving unit 11 or via the communication transmitting/receiving unit 15 in a necessary situation. Further, the AIT acquisition unit 14 passes the acquired AIT to the application execution control unit 16. The application execution control unit 16 controls the life cycle of the application associated with the specific package according to the passed AIT. That is, the application execution control unit 16 puts the application in an operable state (READY), automatically starts it, or forcibly terminates it (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 shown in the figure, the television system 100 includes a transmitting device 3, a server device 5, and a receiver 1.

The transmitter 3 transmits a broadcast signal. The broadcast signal transmitted by the transmitter 3 includes video data (video asset), audio data (audio asset), subtitle text data (subtitle asset), super text data (super asset), and super text data (super asset). , Control information data, etc. are included. The transmission device 3 transmits various assets and control information as a signal that is logically collected in package units. The transmitter 3 may send out a plurality of packages as transmission signals within one band. For example, in the case of multi-composition, the transmitter 3 sends out a plurality of packages simultaneously in parallel.

Then, as a part of the above-mentioned control information data, the above-mentioned MPT, AIT, DTM, EMT and the like associated by the location information in the MPT are also included. The broadcast signal transmitted by the transmitter 3 is transmitted wirelessly (terrestrial wave or satellite broadcast wave) or by wire (cable for television broadcasting).

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 send data to the receiver 1.

The receiver 1 receives the broadcast signal from the transmission device 3 and communicates with the server device 5. The receiver 1 receives the application program from the server device 5 according to 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 as setting the application into a startable state, starting the application, or terminating the application according to the received application control code in the AIT.

As a result, even in a situation such as multi-composition, the receiver 1 acquires the MPT regarding a specific package and the AIT, DTM, and EMT associated with the MPT. Then, the receiver 1 performs life cycle control and real-time control of an application (broadcast managed application) according to the AIT associated with the specific package.
That is, it is possible to map the package (service) with the AIT, DTM, and EMT.

FIG. 5 is a block diagram showing 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. Composed of. The control information setting unit 34 also includes an application control information setting unit 36 inside.

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 transfers it to the multiplexing unit 37.

The control information setting unit 34 sets the control information regarding the service and transfers it to the multiplexing unit 37. Here, the control information set by the control information setting unit 34 includes the above-mentioned MPT, AIT, DTM, and EMT tables and message information. In addition, the control information setting unit 34 also sets other control information required as a broadcast signal and passes it to the multiplexing unit 37.
The control information setting unit 34 is configured to include the application control information setting unit 36 as a part of the function of setting the control information. The control information set by the control information setting unit 34 satisfies the requirements described with reference to FIGS. 2 and 3. That is, in the control information set by the control information setting unit 34, AIT location information, DTM location information, EMT location information, etc. are included 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 in FIG. The control information setting unit 34 associates the MPT with the 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 the AIT information.
The multiplexing unit 37 multiplexes each received data.
The broadcast transmitter 38 modulates the data multiplexed by the multiplexer 37 and transmits it as a broadcast signal.

Next, an example of program transmission by the transmitter 3 will be described. The transmission device 3 may transmit broadcast contents in multi-composition. According to the multi-composition, a plurality of programs can be broadcast on one channel. For example, when broadcasting two programs (two services, two packages) on one channel, the main channel and sub-channel of that channel are used. Each of these main channels and sub-channels is a service. For example, the transmitting device 3 transmits one so-called 8K television (horizontal 7680 pixels, vertical 4320 pixel resolution) and one 4K television (horizontal 3840 pixels, vertical 2160 pixel resolution) two waves. You can switch between and. At this time, the capacity of the channel used for transmission can accommodate the transmission data in any case.

As described above, according to this embodiment, services (packages) and applications can be mapped. That is, in the present 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). As a result, the broadcast signal analysis unit 12 knows the AIT location, the DTM location, and the EMT location. Therefore, the broadcast signal analysis unit 12 can use the AIT, DTM, and EMT mapped from a specific package, and can supply the information to necessary functional units in the receiver 1.

That is, even in a multi-organization situation, the AIT, DTM, and EMT associated with a specific package can be specified. Then, such an AIT can be used to control the application.

Further, 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 to carry out this embodiment. Accordingly, there is also an advantage that the design of the receiver does not need to be changed on the assumption of the AIT according to the related art.

Further, according to the present embodiment, the information on the location of each of the AIT, DTM, and EMT is held in the MPT in the form of MMT_general_location_info(). Therefore, the expression format of the location information can be made versatile.

[8K1 wave (1 service) configuration example]
Here, a configuration example of a broadcast signal of 8K1 wave (1 service) will be described. Broadcast signals are multiplexed by the MMT (MPEG Media Transport) system. One service (package) is included in this IP data flow. The service includes 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 8K video. This IP data flow contains two PA messages (Package Access message). Each PA message stores MPT (MMT Package Table, 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 indicated.

When the broadcast signal transmitted from the transmission device 3 has the above-mentioned configuration, the receiver 1 side receiving the broadcast signal may select the service "1" or the service "2". 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 wave (2 services)]
Next, a configuration example of a 4K2 wave (2 services) broadcast signal will be described. The MMT method is also used in this example. 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. Two PA messages are included in this IP data flow. Each PA message stores MPT. The MPT in the first service holds the package ID “1”, and the MPT in the second service holds the package ID “2”.
From these both MPTs, the assets (video assets, audio assets, data assets) of the respective packages are indicated. 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 indicated.

When the broadcast signal transmitted from the transmitter 3 has the above-mentioned configuration, the receiver 1 side receiving the broadcast signal selects the MPT having the package ID “1” when the service “1” is selected. Each asset is accessed based on the MPT, 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. It should be noted that items and items similar to those of the above-described embodiment will not be described with reference to the drawings, and items unique to the present embodiment will be mainly described.
The schematic functional configurations themselves of the receiver 1 and the transmitter 3 in the present embodiment are as described in FIGS. 1 and 5, respectively.
In the present embodiment, a part of the format 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 embodiments.

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

(1) descriptor_tag (descriptor tag) is information for identifying a descriptor, and is similar to 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 that stores the application information table (AIT). ait_packet_id is data having a length of 16 bits. This ait_packet_id points to the location of the AIT associated with 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 data having a length of 16 bits. This dtm_packet_id indicates the location of the DTM associated with 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 specified by this num_of_emt.
(6) emt_packet_id (event message table packet identification) indicates the packet identification of the M2 section message that stores the event message table (EMT). emt_packet_id is data having a length of 16 bits. This emt_packet_id indicates the location of the EMT associated with the MPT.

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

Similar to the first embodiment, the receiver 1 that receives the MPT refers to a table or the like pointed to by using the AIT location information, the data transmission message location information, and the event message table location information. .. As a result, also in this embodiment, it is possible to perform mapping from MPT to AIT, DTM, EMT for a specific package. The content of the processing based on the acquired AIT, DTM, and EMT on the receiver 1 side is the same as that 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 instead of MMT_general_location_info() as the location information to be used, 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. It should be noted that drawings and description of the same items as those of the above-described first embodiment or second embodiment will be omitted, and items unique to this embodiment will be mainly described.
The schematic functional configurations themselves of the receiver 1 and the transmitter 3 in the present embodiment are as described in FIGS. 1 and 5, respectively.

In each of the above-described first and second embodiments, the MPT uses one AIT location information, one DTM location information, and one or more EMT location information as a group, They kept one set of that information.
On the other hand, 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 expanded. Specifically, in FIG. 3, the loop from ait_location_info() to emt_location_info() (to the end of the block by the for syntax) appears only once in one application control descriptor. In this embodiment, the entire loop from ait_location_info() to emt_location_info() is repeated multiple 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 expanded. In this case, specifically, the entire loop from ait_packet_id to emt_packet_id() in FIG. 6 (to the end of the block using the for syntax) is repeated multiple times in a larger loop. A data item indicating the number of repetitions is provided immediately after descriptor_length.

As described above, one set of AIT location information, one piece of DTM location information, and one or a plurality of pieces of EMT location information are held in the MPT and transmitted from the transmitting device 3 side. That is, the receiver 1 side that has received a broadcast signal including such MPT, in which multiple pieces of application information table location information and the like are included in the MPT, selects an application by appropriately selecting a set of location information. Can be controlled by a plurality of control patterns. As an example, when transmitting a nationwide TV program from a broadcasting station provided in each region, an application or a group of applications 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 of the plurality of sets of AIT location information, DTM location information and EMT location information in the MPT is the default set may be further provided in the MPT. At this time, the receiver 1 refers to the set indicated by this flag among the plurality of sets of location information as default location information.

The functions of the receiver, the transmitter, and the server in each of the above-described embodiments may be realized by a computer. In that case, the program for realizing the functions of each of these devices may be recorded in a computer-readable recording medium, and the program recorded in this recording medium may be read by a computer system and executed. .. The “computer system” mentioned here includes an OS and hardware such as peripheral devices. The "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in a computer system. Further, the "computer-readable recording medium" means that a program is dynamically held for a short time like a communication line when transmitting the program through a network such as the Internet or a communication line such as a telephone line. In this case, it is possible to include the one that holds the program for a certain period of time, such as the volatile memory inside the computer system that is the server or the client in that case. Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and may be one for realizing the above-mentioned functions in combination with a program already recorded in the computer system.

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

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and includes a design and the like within a range not departing from the gist of the present invention.

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

1 Receiver 3 Transmission Device 5 Server Device 11 Broadcast Reception Unit 12 Broadcast Signal Analysis Unit 14 AIT Acquisition Unit (Application Information Table Acquisition Unit)
15 communication transmitting/receiving unit 16 application execution control unit (application execution control unit)
17 Application Execution Unit (Application Execution Unit)
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 receiving unit for receiving a broadcast signal,
From the broadcast signal received by the broadcast receiving unit, a descriptor included in the control information belonging to the package corresponding to the selected broadcast service is extracted, and application information table location information included in the descriptor is stored. A broadcast signal analysis unit that obtains 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 that acquires an application information table indicated by the application information table location information acquired by the broadcast signal analysis unit;
An application execution unit that executes 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;
Equipped with,
In the control information, a plurality of the application information table location information is repeatedly included ,
The number of repetitions is provided in the control information,
A receiver characterized in that. From the broadcast signal received by the broadcast receiving unit, a descriptor included in the control information belonging to the package corresponding to the selected broadcast service is extracted, and the application information table location information included in the descriptor, and Broadcast signal analysis means for acquiring data transmission message location information contained in the descriptor and event message table location information contained 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 the execution in the application execution means of the application associated with the broadcast service selected according to the application information table acquired by the application information table acquisition means,
A program that causes a computer to function as
In the control information, a plurality of the application information table location information is repeatedly included ,
The number of repetitions is provided in the control information,
program.

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