JP6510091B1 - Broadcast signal transmitter and receiver - Google Patents

Abstract

The present invention provides a broadcast signal transmitting / receiving apparatus that facilitates reception of a file of application data by providing restriction on path information when performing data content service. A broadcast transmission apparatus 100 is configured to prohibit a setting such that arbitrary two base_directory_paths are in a forward match and one path constitutes a part of the other path with respect to a path of a directory configuration of application data. And any two directory_node_paths with the same base_directory_path determine the path to forbid a configuration such that there is a forward match and one path constitutes part of the other. The television receiver 140 obtains a file of application data based on the base_directory_path and the directory_node_path. [Selected figure] Figure 1

Description

  Embodiments of the present invention relate to a broadcast signal transmitting and receiving apparatus.

  Multimedia services in advanced BS digital broadcasting and advanced broadband CS digital broadcasting are a general term for subtitle services, super-character services, and data content services, and the provisions of Non-Patent Document 1 and Non-Patent Document 2 and the Operation of Non-Patent Document 3 It will be done according to the regulations.

  A data content service, which is one of multimedia services, is a service that provides an application function based on HTML or the like that is asynchronous to a broadcast program, and a case where application data constituting the application function is transmitted using a broadcast wave It is divided into two types, the type that includes the type and the type that does not include the case of transmitting using broadcast waves.

  In the type including the case of transmitting application data using a broadcast wave, the transmission method is defined in Non-Patent Document 1 as an application transmission method, and the operation method is defined in Non-Patent Document 3 as an operation of data transmission method. ing.

  In the application transmission method defined in this non-patent document 1, data constituting an application is encapsulated in an asynchronous type MPU (Media Processing Unit) in file units and transmitted, and control information of data constituting an application is also transmitted. , MH-AIT (MPEG-H Application Information Table), and data transmission messages.

ARIB STD-B60 1.10 version revised on July 27, 2017, Radio Industries Association of Japan ARIB STD-B62 1.7 version revised on July 27, 2017, Japan Radio Industry Association "Multi-media coding method (second generation) standard in digital broadcasting" ARIB TR-B39 Version 1.5 Revised on October 17, 2017, Japan Radio Industry Association

  When the broadcast signal receiver activates the data content service, for example, the path described in URL_base_byte of MH-transmission protocol descriptor included in MH-AIT and initial_path_byte of MH-simple application location descriptor included in MH-AIT Receive files necessary for starting services based on the information. In addition, unreceived files that are appropriately referenced by the application during application startup are received with reference to path information included in the data transmission message.

  However, the rules regarding the path information included in the MH-AIT and the data transmission message have no restriction except that the end of the character string of the path information ends with "/". For this reason, when processing the data content service, there is a possibility that the analysis of the path for receiving necessary files may be complicated, and in some cases, there is a problem that the path analysis can not be performed correctly. The

  Therefore, an object of the present embodiment is to provide a broadcast signal transmitting / receiving apparatus that easily processes reception of a file of required application data by providing restriction on path information when performing data content service.

A broadcast signal transmitting and receiving apparatus according to the present embodiment includes a transmitting apparatus for broadcasting a broadcast program and application data for realizing an application function added to the broadcast program by a broadcast signal, and the broadcast program included in the received broadcast signal. A broadcast signal transmitting / receiving device comprising a receiving device for displaying the application data on a display;
The transmitting device is
An application data generation unit that generates a file of the application data;
A control signal generation unit that generates control information when transmitting the file generated by the application data generation unit by the broadcast signal, video data and audio data that constitute the broadcast program, and the application data generation unit A multiplexing unit that multiplexes the application data and the control information generated by the control signal generation unit to generate a multiplexed stream; and a transmission unit that transmits the multiplexed stream.
When the application data generation unit generates the plurality of files, any two base_directory_paths with respect to a path in the directory configuration in which the plurality of files are arranged when generating the plurality of files are forward-matched and one path is the other The path is determined to prohibit the setting that configures the part of the path, and the setting is such that any two directory_node_paths whose base_directory_path is identical have a forward match and one path configures the part of the other path. Means for determining a path to forbid, and the control signal generation unit has means for arranging the determined base_directory_path and the directory_node_path in the control information,
The receiving device is
Based on the base_directory_path and the directory_node_path extracted from the control information separated by the separation unit that separates the received multiplexed stream into the video data, the audio data, the application data, and the control information from the multiplexed stream received, A file processing unit for obtaining the file of the application data.

FIG. 1 is a diagram showing an example of the overall configuration of a system including a broadcast signal transmission apparatus (also referred to as a broadcast station), a broadcast signal reception apparatus (also referred to as a television reception apparatus), and a service provider apparatus according to the present embodiment. FIG. 2 is a diagram schematically showing the configuration of the first basic function of the broadcasting station of FIG. FIG. 3 is a diagram schematically showing the configuration of a television receiver. FIG. 4 is a diagram showing an outline of transmission of a broadcast signal of a broadcasting station in the case of performing data content service. FIG. 5A is a processing flow in which the broadcast signal transmitting apparatus 100 determines the directory configuration of files making up application data when transmitting application data, and sets values in the DDMT based on the determined directory configuration. It is. FIG. 5B shows a processing flow of data content service activation when the broadcast signal receiving apparatus receives a broadcast program and a data content service is added. FIG. 6 shows an example in which base_directory_path, directory_node_path, and file_name are set when two DDMTs of DDMT1 and DDMT2 are transmitted in a session. FIG. 7 is an example in which the combination of base_directory_path, directory_node_path, and file_name of the DDMT is d1 / d2 / d3 / f1.

  Embodiments will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an example of the overall configuration of a system including a broadcast signal transmission apparatus (also referred to as a broadcast station) 100, a broadcast signal reception apparatus (also referred to as a television reception apparatus) 140, and a service provider apparatus 120 according to the present embodiment. It is.

  The broadcast signal transmission device 100 includes a broadcast program server 101, a first application management / distribution unit 102, a first application server 103, and a first basic function 104.

  The first basic function 104 is a basic function of the broadcast station 100, and has a function of encoding (also referred to as encoding) and multiplexing a video signal and an audio signal of a program to be broadcast and transmitting it as a broadcast signal. .

  The broadcast program server 101 is an area for storing in advance a program to be broadcast as the broadcast station 100, a program title, a program ID, a program summary, a cast name, a broadcast date, and other data.

  Also, the broadcast station 100 can add a data content service that simultaneously provides an application function such as HTML by a broadcast wave to a program to be broadcast. In this case, the broadcast station 100 can arrange, in the transmission control signal, the first specification information indicating that the application program is added to the program to be broadcast, and can transmit it as a broadcast signal by the first basic function 104 . The first specification information is, for example, an application service descriptor disposed in MPT (MMT Package Table) described in Non-Patent Document 1.

  The first application management and distribution unit 102 manages data stored in the first application server 103, which is necessary for adding an application function to a broadcast program. The first application management and distribution unit 102 also distributes the managed application function to the broadcast signal receiving apparatus 140.

  The first application server 103 is an area in which data for adding an application function to a broadcast program is stored in advance.

  The service provider device 120 can add a service that simultaneously provides an application function such as HTML to the program broadcast by the broadcast station 100 via the network 180 in cooperation with the broadcast station 100.

  The service provider device 120 includes a second application management and distribution unit 121 and a second application server 122.

  The second application management and distribution unit 121 manages content and applications stored in the second application server 122 and distributes the content to the television receiver 140.

  The second application server 122 is an area for storing content and applications to be provided to the television receiver 140.

  In response to the request from the television receiver 140 that has received the first designation information, the service provider device 120 performs second application management / distribution of the application and content stored in the second application server 122. The data is transmitted to the television receiver 140 by the unit 121 via the network 180 such as the Internet.

  The television receiver 140 includes a digital broadcast reception function (second basic function 141), a communication control unit 142, and an application control unit (also referred to as a file processing unit) 143. Also, the television receiver 140 can acquire an application from the service provider device 120 via the network 180 and operate the application.

  The second basic function 141 is a basic function as a television receiver, receives a broadcast wave sent from the broadcast station 100, and includes a coded video signal (a video stream included in the broadcast wave). Separate encoded video signals (also called audio streams), application data and transmission control signals, decode video and audio signals, receive application data, analyze transmission control signals, Have the ability to

  The second basic function 141 is a peripheral device connected to the television receiver 140, such as a display 160, a speaker 161, an HDD (Hrad Disk Drive) 162 bound to the television receiver 140, removable media It also manages the connection with 170 and the transmission and reception of data.

  The communication control unit 142 controls transmission and reception of data when the television receiver 140 communicates with the service provider device 120 via the network 180.

  The application control unit 143 manages and controls control information such as MH-AIT and data transmission message sent from the broadcast station 100 by the application transmission method. The application control unit 143 also accesses the cache data unit 309, and acquires a file necessary for performing a data content service from the cached data.

  The display 160 incorporates a speaker 161, and displays the video signal decoded by the second basic function 141 in a display area, and outputs an audio signal to the speaker 161. The speaker 161 incorporated in the display 160 may be an external speaker connected by an I / F such as USB.

  Although the display 160 is described separately from the television receiver 140 in the example of FIG. 1, the display 160 may be integrated with the television receiver 140 as one function of the television receiver 140.

  FIG. 2 is a diagram schematically showing the configuration of the first basic function 104 of the broadcast station 100 of FIG. The first basic function 104 includes a video encoder 201, an audio encoder 202, a subtitle encoder 203, an application data generation unit 204, and a transmission control signal generation unit 205 for generating a transmission control signal.

  The video encoder 201 encodes the video of the program A read from the broadcast program server 101 as a program to be broadcast from now. The codec type of the video encoder 201 is MPEG-2, H.264, or H.264. H.264 (AVC: Advance Video Coding), H.264. Any one of H.265 (HEVC: High Efficiency Video Coding) may be used. Also, the codec type is not limited to this.

  The audio encoder 202 encodes the audio of the program A read from the broadcast program server 101 as a program to be broadcast from now.

  The subtitle encoder 203 encodes subtitles of the program A read from the broadcast program server 101 as a program to be broadcast from now.

  When adding a service that simultaneously provides an application function such as HTML to the program A read from the broadcast program server 101 as a program to be broadcast from now on, the application data generation unit 204 generates application data that constitutes this application function. The application data is composed of a plurality of files, and the application data generation unit 204 determines the directory configuration of each file in order to transmit these files by a broadcast signal.

  The transmission control signal generation unit 205 includes control information on the configuration of a broadcast wave including a video stream, an audio stream, a transmission control signal, etc. included in a broadcast wave broadcasted by the broadcast station 100, a program name of the program to be broadcast, and a broadcast And generating control information on a broadcasted program including time and the like. The transmission control signal generation unit 205 also generates control information on application data generated by the application data generation unit 204. Control information of application data generated by the transmission control signal generation unit 205 will be described with reference to FIG.

  The scrambler 206 scrambles the output of the video encoder 201, the output of the audio encoder 202, the output of the subtitle encoder 203, and the output of the application data generation unit 204 as necessary.

  The output of the transmission control signal generation unit 205 and the video, audio, subtitles, and application data scrambled by the scrambler 206 as necessary are multiplexed by the multiplexing unit 207 and sent to the transmitter 208 as a multiplexed stream. The transmitter 208 transmits the broadcast wave from the antenna. As a multiplexing method when multiplexing is performed by the multiplexing unit 207, a method of MMT (Mpeg Media Transport) is used.

  FIG. 3 schematically shows the configuration of the television receiver 140. As shown in FIG. The television receiver 140 includes a second basic function 141 which is a function of receiving a broadcast wave, a communication control unit 142, and an application control unit 143. The television receiver 140 is also connected to the display 160. The display 160 incorporates a speaker 161.

  The second basic function 141 includes a broadcast tuner 301, a demultiplexer 302, a descrambler 304, a video decoder 306, an audio decoder 307, a subtitle decoder 308, a cache data unit 309, and a transmission control signal analysis unit 310.

  The broadcast tuner 301 demodulates the stream (broadcast signal) transmitted by the broadcast wave. The demodulated stream (broadcast signal) is input to the demultiplexer 302. The demultiplexer 302 separates the input multiplexed stream into a video stream, audio stream, subtitle stream, application data, transmission control signal, and the video stream, audio stream, subtitle stream, application data to the descrambler 304. The transmission control signal is input to the transmission control signal analysis unit 310.

  The descrambler 304 descrambles each stream as necessary, and the video stream to the video decoder 306, the audio stream to the audio decoder 307, the subtitle stream to the subtitle decoder 308, and the application data to the cache data unit 309. Enter each one.

  The video stream is decoded by the video decoder 306, the audio stream is decoded by the audio decoder 307, and the subtitle stream is decoded by the subtitle decoder 308.

  The transmission control signal analysis unit 310 analyzes various control information included in the transmission control signal. The transmission control signal analysis unit 310 sends, to the application control unit 143, MH-AIT which is control information on application data among the analyzed transmission control signals, to the application control unit 143 for further analysis.

  The application control unit 143 manages and controls control information such as MH-AIT, which is control information related to application data, sent from the transmission control signal analysis unit 310, such as a data transmission message.

  Further, the application control unit 143 performs screen display control of data broadcasting by controlling the browser 311 using the cached data stored in the cache data unit 309. Also, the browser 311 generates screen superimposed data of subtitles from the output data of the subtitle decoder 308.

  The decoded video signal, subtitles, and display contents of data broadcasting are synthesized by the synthesizer 326 and output to the display 160.

  The audio data decoded by the audio decoder 307 is output to a speaker 161 incorporated in the display 160.

  The codec type of the video decoder 306 is H.264. No. 265, but is not limited thereto, and MPEG-2, H.264, H.264, and H.264. H.264 may be used. Also, the codec type is not limited to this.

  The communication control unit 142 has a remote control I / F 342 which is an I / F between the network I / F 341 which is an I / F with the communication network 180 and a remote controller (remote control) 352.

  The communication control unit 142 can connect to the service provider apparatus 120 via the network 180 via the network I / F 341. The communication control unit 142 can acquire an application or content managed by the service provider device 120 via the network 180. The acquired application and content are sent from the communication control unit 142 to the browser 311 and used for display and the like.

  FIG. 4 is a diagram showing an outline of transmission of a broadcast signal of a broadcasting station in the case of performing data content service.

  When a data content service is added to the program B including the video component 401, the audio component 402, and the subtitle component 403, the transmission control signal generation unit 205 of the broadcasting station 100 generates the MPT 410 in which the application service descriptor is arranged and transmits the transmission control signal. Send as.

  Further, the transmission control signal generation unit 205 of the broadcast station 100 generates and transmits the MH-AIT 420 in which the entry file of the application of the data content service added to the broadcast program B is set.

  Furthermore, the transmission control signal generation unit 205 generates and transmits control information necessary for transmission of application data for performing data content service.

  The control information necessary for transmission of the application data has a data directory management table (DDMT) 421 having path information in the directory structure of the file forming the application data, and information on the MPU to which the application data is sent. It includes a Data Asset Management Table (DAMT) 422 and a Data Content Configuration Table (DCCT) 423 having information on a PU (Presentation Unit) unit of application data.

  Further, the application data generation unit 204 of the broadcast station 100 cooperates with the transmission control signal generation unit 205 to encapsulate the application data read from the application management / distribution unit 102 into the asynchronous MPUs 430 and 431 and transmits it.

  Application data is composed of a plurality of files. The application data generation unit 204 determines the directory configuration of each file in order to transmit application data by a broadcast signal. The path information in the directory configuration of the files that constitute the application data is transmitted to the television receiver 140 by the DDMT 421 shown above. Some application data may further refer to other application data. In this case, URLs (Uniform Resource Locators) of other application data to be referred to are further described in the application data.

  As described above, path information for accessing a file in the data content service is described in the entry file information set in the MH-AIT 420 and the URL set in the application data, and the television receiver 140 Path information in the directory structure of these files is sent to the television receiver 140 as set in the DDMT 421 as described above.

  When the television receiver 140 recognizes the contents of the URL from the activation of the data broadcast by the received MH-AIT 420 or the received application data, it receives the necessary file based on the information set in the DDMT 421, Access the received file and execute the data content service.

  An entry file is set in the MH-AIT 420, and application data to be accessed by the television receiver 140 based on the entry file is transmitted via a broadcast signal via the communication control unit 142. For example, application data 440 connected by the network 180 and managed by the service provider device 120 may be used. In this case, a URL on the Internet is designated as the entry file information.

Here, the non-patent document 3 defines that the URL in the case of referring to application data to be transmitted by broadcasting is the following format.
<base_url><base_directory_path><directory_node_path><file_name>
<base_directory_path>: Base directory path described in DDMT <directory_node_path>: Directory node path described in DDMT
<file_name>: File name described in DDMT Here, in <base_directory_path> and <directory_node_path>, it is specified that the end of the character string ends with “/”, but “/” in the middle of the character string It is not forbidden to put For this reason, the directory hierarchy in which files are placed is not necessarily two hierarchies, but it is possible to make the directory hierarchy deeper.

Therefore, the broadcast signal transmitting apparatus 100 according to the present embodiment further provides the following restriction on the path in the directory configuration of the files forming the application data.
(Restriction 1) In any two paths of base_directory_path, setting that forward match and one path form a part of the other path is prohibited.
(Restriction 2) When base_directory_path is the same, in the two arbitrary paths of the continuing directory_node_path, the setting is made such that the forward match and one path form a part of the other path.

  This limit may be, for example, a limit per data transmission session. As described in Non-Patent Document 3, the data transmission session is a period during which the application data configuration and the directory configuration that configure the data content service are the same.

  FIG. 5A determines the directory configuration of the file making up the application data based on the limitations 1 and 2 when the broadcast signal transmitting apparatus 100 transmits the application data, and based on the determined directory configuration. Shows a process flow for setting a value in the DDMT 421.

  The application data generation unit 204 reads application data to be transmitted to the television receiver 140 from the application management and distribution unit 102 (S501). The application data is composed of a plurality of files, and the application data generation unit 204 determines a directory configuration to transmit a plurality of files of the read application data by a broadcast signal (S502). The application data generation unit 204 determines the directory configuration based on the restrictions 1 and 2 when determining the directory constituting the application data, and generates an index_item for transmitting the list of file_name as a part of the application data. .

  Also, when the application data generation unit 204 determines the directory configuration (S502), the transmission control signal generation unit 205 sets the base_directory_path, directory_node_path, and file_name of the DDMT 421 based on the information of the determined directory configuration (S503). It ends (S504). However, file_name is not set in the directory node referenced by the MPU node descriptor in DAMT 422.

  Further, the transmission control signal generation unit 205 sets the entry file information of the application of the data content service in the MH-AIT 420. In this case, the transmission control signal generation unit 205 sets the contents of the base_directory_path set in the DDMT 421 to the URL_base of the MH-transmission protocol descriptor included in the MH-AIT 420, and the contents of the directory_node_path and the file_name set in the DDMT 421 to the MH-AIT 420. Set in initial_path of the MH-simple application location descriptor included in.

  FIG. 5B shows a process flow of data content service activation when the broadcast signal receiving apparatus 140 receives a broadcast program and a data content service is added.

  When the transmission control signal analysis unit 310 of the broadcast signal receiving apparatus 140 receives the MPT 410 as the transmission control signal as described above, it starts data content service activation processing (S510).

  The transmission control signal analysis unit 310 confirms whether an application service descriptor is arranged in the received MPT 410 (S511).

  When the transmission control signal analysis unit 310 recognizes that the application service descriptor is disposed in the MPT 410 as a result of confirmation (Yes in S 512), the data content service is added to the program of the received broadcast wave I will judge.

  After confirming that the application service descriptor is arranged in the MPT 410, the transmission control signal analysis unit 310 waits for the transmission of the MH-AIT 420 as a transmission control signal.

  When the transmission control signal analysis unit 310 receives the MH-AIT 420 (S513), the URL_base and MH- of the MH-transmission protocol descriptor, which is the entry file information of the initial start application for which the application_control_code of the MH-AIT 420 is set as AUTOSTART. The initial_path of the simplified application location descriptor is taken out (S 514), and notified to the application control unit 143. As described above, the URL_base of the MH-transmission protocol descriptor is the base_directory_path set in the DDMT 421, and the initial_path of the MH-simple application location descriptor is the directory_node_path and the file_name set in the DDMT 421. It is set.

  The transmission control signal analysis unit 310 checks whether the initial activation application has been sent by broadcast wave (S515), and if it is sent by broadcast wave (Yes in S516), the DDMT 421 and DAMT 422 will be sent. wait.

  When receiving the DDMT 421 and the DAMT 422 (S517), the transmission control signal analysis unit 310 searches the DDMT 421 for an entry file information that corresponds to the entry file information, and identifies the MPU corresponding to the entry with reference to the DAMT 422. Also, the location information of the asset corresponding to the component_tag is extracted with reference to the MH-stream identification descriptor included in the MPT 410, and set in the demultiplexer 302 together with the MPU_sequence_number to wait for application data to be received.

  When the transmission control signal analysis unit 310 receives application data (S518), the transmission control signal analysis unit 310 notifies the application control unit 143.

  The application control unit 143 having received this notification notifies the browser 311 of the information of the entry file, and starts the data content service (S519).

  The browser 311 generates content to be displayed on the display unit 160 from the application data read from the cache data unit 309, displays the generated content on the display 160 (S520), and ends the processing (S521).

  The application control unit 143 activates the data content service based on the URL_base of the MH-transmission protocol descriptor which is the entry file information and the initial_path of the MH-simple application location descriptor in the process of S519.

  At this time, although the application control unit 143 can uniquely identify the base_directory_path described in the DDMT 421 from the URL_base of the MH-transmission protocol descriptor, the directory_node_path described in the DDMT 421 from the initial_path of the MH-simple application location descriptor Matching with the information of file_name can be efficiently performed if directory_node_path and file_name of the DDMT 421 are set based on the restriction 2 described above.

  Further, as a result of analyzing the application data read from the cache data unit 309, the application control unit 143 may further recognize a URL to be referred to. The application control unit 143 accesses the application data temporarily stored in the cache data unit 309 based on the information of the recognized URL, and executes the data content service of the corresponding file. Alternatively, the application control unit 143 may access, for example, application data managed by the service provider device 120, which is connected via the communication control unit 142 via the network 180 based on the information of the recognized URL. . Here, the file designated by the URL may be received from within the broadcast signal and newly stored in the cache data unit 309.

  When application data to be temporarily stored in the cache data unit 309 is determined based on the entry file information, or information on a character string of a URL to be referenced as a result of analyzing the application data is recognized, the cache data unit 309 is When determining application data to be newly temporarily stored, the application control unit 143 matches the entry file information or the information of the recognized URL character string with the information of base_directory_path, directory_node_path, and file_name described in the DDMT 421. Further, the MPU to be received is specified by collating with the DAMT 422. In the directory node referenced by the MPU node descriptor in DAMT 422, matching with the information of base_directory_path and directory_node_path of DDMT 421 is performed and collation with DAMT 422 is performed to specify the MPU to be received.

  This matching operation can be efficiently performed when the base_directory_path and directory_node_path of the DDMT 421 are set based on the above-described limit 1 and limit 2.

  FIG. 6 shows an example in which base_directory_path and directory_node_path are set based on Limit 1 and Limit 2 when two DDDTs 421 of DDMT 1 (601) and DDMT 2 (602) are transmitted in a session. . The base_directory_path satisfies the restriction 1 in DDMT1 (601) and DDMT2 (602). Also, in the DDMT 1 (601), the directory_node_path satisfies the restriction 2.

  7 corresponds to the case where the directory node is referenced by the MPU node descriptor in DAMT 422 in the case where base_directory_path and directory_node_path of DDMT 421 are not set based on limit 1 and limit 2. An example is shown in which it is difficult to specify the MPU when newly caching a file represented by http: // localhost / d1 / d2 / d3 / f1. The base_directory_path does not satisfy restriction 1 in the DDMT1 (701) and the DDMT2 (702). Also, in the DDMT 1 (701), the directory_node_path does not satisfy the restriction 2.

  Since the application control unit 143 does not know the boundaries between base_directory_path and directory_node_path and file_name, it is possible to match the node corresponding to which of base_directory_path and directory_node_path set in DDMT 421 shown in FIG. , The judgment can not be made only by referring to the information of DDMT 421.

  For this reason, the application control unit 143 further refers to the DAMT 422, acquires the MPU corresponding to any of the node_tags, confirms the index_item therein, and the file name of the expected value is included for the first time. It is possible to receive the MPU and judge that the file can be cached. If index_item does not contain the file name of the expected value, it will try to receive MPUs of other nodes.

  When the application control unit 143 searches for a path in the directory configuration set in the DDDT 421 that matches the character string of the entry file information or the character string of the URL to be referred to, the number of directory hierarchies becomes large (large). As the number of combinations of information of DDMT 421 to be searched increases, the directory node set in DDDT 421 may take time to obtain the desired file in the correct directory node, or may match. The process of sequentially acquiring the MPU corresponding to may fail, and a desired file may not be acquired.

  On the other hand, the broadcast signal receiving apparatus 140 according to the present embodiment refers to the information of the DDMT 421 because the information set in the DDMT 421 is set based on the restriction 1 and the restriction 2 as shown in FIG. It is possible to uniquely determine which directory node of the DDDT 422 matches the entry file information or the URL string to be referred to.

  As described above, in the broadcast signal receiving apparatus 140 according to the present embodiment, since the information of base_directory_path and directory_node_path set in the DDMT 421 is set based on the restriction 1 and the restriction 2, the data can be read only by referring to the information of the DDMT 421 It becomes possible to specify a directory node including a desired file of the content service, and it becomes possible to efficiently obtain the desired file.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof. Furthermore, in each of the constituent elements in the claims, the constituent elements may be divided and expressed, or a plurality of the constituent elements may be expressed together or they may be expressed in combination, which falls within the scope of the present invention. Also, a plurality of embodiments may be combined, and an embodiment configured by this combination is also within the scope of the invention.

  In addition, the drawings may be schematically represented as compared to the actual embodiment in order to clarify the description, but they are merely examples and do not limit the interpretation of the present invention. In the specification and the drawings, components having the same or similar functions as those described above with reference to the drawings already described may be denoted by the same reference symbols, and overlapping detailed descriptions may be omitted as appropriate. . When the claims are expressed as control logic, they are expressed as a program including an instruction that causes a computer to execute, and even when they are expressed as a computer-readable recording medium in which the instructions are described, the apparatus of the present invention is applied. is there. In addition, the names and terms used are not limited, and other expressions are included in the present invention as long as they have substantially the same contents and the same purpose.

100: broadcast station 101: broadcast program server 102: first application management / distribution unit 103: first application server 104: first basic function 141 · · · 2nd basic function, 142 · · · communication control unit, 143 · · · application control unit, 204 · · · application data generation unit, 205 · · · transmission control signal generation unit, 310 · · · transmission control signal Analysis unit.

Claims (1)

A transmitter for broadcasting a broadcast program and application data for realizing an application function added to the broadcast program by a broadcast signal, and displaying on the display the broadcast program and the application data included in the received broadcast signal In a broadcast signal transmitting and receiving apparatus comprising a receiving apparatus,
The transmitting device is
An application data generation unit that generates a file of the application data;
A control signal generation unit that generates control information when the file generated by the application data generation unit is transmitted by the broadcast signal;
A multiplexing unit that generates multiplexed streams by multiplexing video data and audio data that constitute the broadcast program, the application data generated by the application data generation unit, and the control information generated by the control signal generation unit; ,
A transmitter for transmitting the multiplexed stream;
Have
When the application data generation unit generates the plurality of files, any two base_directory_paths with respect to a path in the directory configuration in which the plurality of files are arranged when generating the plurality of files are forward-matched and one path is the other The path is determined to prohibit the setting that configures the part of the path, and the setting is such that any two directory_node_paths whose base_directory_path is identical have a forward match and one path configures the part of the other path. Have a means to determine the path to prohibit
The control signal generation unit has means for arranging the determined base_directory_path and the determined directory_node_path in the control information,
The receiving device is
A separation unit that separates the received multiplexed stream into the video data, the audio data, the application data, and the control information;
A file processing unit for obtaining the file of the application data based on the base_directory_path and the directory_node_path extracted from the control information separated by the separation unit.

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