Content protection processing method

Abstract

To provide a digital broadcast receiver that can execute a function with a higher added value.SOLUTION: A digital broadcast receiver comprises: a receiving unit that receives video data of a digital broadcast program, program cooperation data, and screen layout control information; a video generation unit that generates video information obtained by composing a plurality of areas as output video information; a display that displays the output video information; and a control unit. When there is no effective screen layout control information, the control unit controls the video generation unit to generate program video information as the output video information without dividing a video display area. After acquisition of the effective screen layout control information, the control unit controls the video generation unit to divide the video display area into a plurality of areas based on the effective screen layout control information, and arrange the program video information generated based on the received video data of the digital broadcast program and either one of character information, graphic information, or video information generated based on the received program cooperation data.SELECTED DRAWING: Figure 7A

Description

[Technical field]

[0001] The present invention relates to a broadcast receiving technology and an output video information generating technology. [Background technology]

[0002] One of the expansion functions of the digital broadcasting service is data broadcasting, which transmits digital data via broadcast waves and displays various information such as weather forecasts, news, recommended programs, etc. Many television receivers capable of receiving data broadcasting are already commercially available, and many technologies related to receiving data broadcasting have been published, including Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-186486 A Summary of the Invention [Problem to be solved by the invention]

[0004] In response to recent changes in the content distribution environment, television receivers are also being required to have various functional extensions. In particular, there are many demands for the distribution of content and associated applications using broadband network environments such as the Internet, and for higher resolution / definition video content. However, it is difficult to realize a high-added-value television receiver that can meet the demands by only utilizing the data broadcasting reception function, etc., of current television receivers or by only extending the function of the data broadcasting reception function, etc.

[0005] An object of the present invention is to provide a content protection processing method capable of executing functions with higher added value. [Means for solving the problem]

[0006] As a means for solving the above problems, the technology described in the claims is used. Effect of the Invention

[0007] By using the technology of the present invention, it is possible to realize a content protection processing method capable of executing functions with higher added value. [Brief description of the drawings]

[0008] [Figure 1] 1 is a system configuration diagram showing an example of a broadcast communication system including a broadcast receiving device according to a first embodiment. [Figure 2A] FIG. 1 is an explanatory diagram of an overview of a coded signal in MMT. [Figure 2B] FIG. 1 is a diagram illustrating the configuration of an MPU in MMT. [Figure 2C] FIG. 1 is a diagram showing the structure of an MMTP packet in MMT. [Diagram 3] FIG. 1 is a conceptual diagram of a protocol stack for a broadcasting system using MMT. [Figure 4] FIG. 2 is a diagram showing a hierarchical structure of control information used in a broadcasting system. [Figure 5A] This is a list of tables used in the TLV-SI of the broadcasting system. [Figure 5B] This is a list of descriptors used in the TLV-SI of the broadcasting system. [Figure 6A] This is a list of messages used in the MMT-SI broadcasting system. [Figure 6B] 1 is a list of tables used in MMT-SI of the broadcasting system. [Figure 6C] This is a list of descriptors used in the MMT-SI of the broadcasting system (part 1). [Figure 6D] This is a list of descriptors used in the MMT-SI of the broadcasting system (part 2). [Figure 6E] FIG. 2 is a diagram showing the relationship between data transmission in a broadcasting system and each table. [Figure 7A] 1 is a block diagram of a broadcast receiving device according to a first embodiment. [Figure 7B]2 is a configuration diagram of a logical plane structure of a presentation function of the broadcast receiving device according to the first embodiment. FIG. [Figure 7C] 1 is a system configuration diagram of clock synchronization / presentation synchronization of a broadcast receiving device according to a first embodiment. [Figure 7D] 2 is a software configuration diagram of the broadcast receiving device according to the first embodiment. [Figure 8] FIG. 2 is a block diagram of a broadcast station server according to the first embodiment. [Figure 9] FIG. 2 is a block diagram of a service provider server according to the first embodiment. [Figure 10A] FIG. 2 is a block diagram of a portable information terminal according to the first embodiment. [Figure 10B] FIG. 2 is a software configuration diagram of the portable information terminal according to the first embodiment. [Figure 11A] A diagram showing the data structure of MH-TOT of a broadcasting system. [Figure 11B] A diagram showing the format of the JST_time parameter of a broadcasting system. [Figure 12] 11 is a diagram illustrating a method of calculating the current date from the MJD of the broadcast receiving device in accordance with the first embodiment. FIG. [Figure 13A] A diagram showing the configuration of the NTP format of a broadcasting system. [Figure 13B] A diagram showing the data structure of an MPU timestamp descriptor in a broadcasting system. [Figure 13C] A diagram showing the data structure of time information in the TMCC extended information area of ​​a broadcasting system. [Figure 14] FIG. 4 is an operational sequence diagram during channel scanning of the broadcast receiving device according to the first embodiment. [Figure 15A] A diagram showing the data structure of the TLV-NIT of a broadcasting system. [Figure 15B] A diagram showing the data structure of a satellite distribution system descriptor of a broadcasting system. [Figure 15C] A diagram showing the data structure of a service list descriptor for a broadcasting system. [Figure 15D] A diagram showing the data structure of AMT of a broadcasting system. [Figure 16] 4 is a diagram showing an operation sequence when the broadcast receiving device according to the first embodiment selects a channel. FIG. [Figure 17] A diagram showing the data structure of the MPT of the broadcasting system. [Figure 18] A diagram showing the data structure of the LCT of the broadcasting system. [Figure 19A] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19B] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19C] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19D] FIG. 13 is a diagram showing an example of assignment of layouts to layout numbers based on the LCT. [Figure 20A] 11A and 11B are diagrams illustrating the operation of exception handling in screen layout control based on the LCT. [Figure 20B] 11A and 11B are diagrams illustrating the operation of exception handling in screen layout control based on the LCT. [Figure 21] A diagram showing the data structure of the MH-EIT of the broadcasting system. [Figure 22A] 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 22B] 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 22C] 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Diagram 23] 4 is a screen display diagram of the broadcast receiving device according to the first embodiment when an emergency alert broadcast is displayed. FIG. [Figure 24] FIG. 11 is a block diagram of a broadcast receiving device according to a second embodiment. [Diagram 25] 11A and 11B are diagrams illustrating inconsistencies in the current time display when switching broadcast services. [Figure 26] FIG. 11 is a diagram illustrating an operation of current time information reference source selection control according to the second embodiment. [Figure 27A] FIG. 11 is a screen display diagram of an EPG screen of a broadcast receiving device according to a second embodiment. [Figure 27B] FIG. 11 is a screen display diagram of an EPG screen of a broadcast receiving device according to a second embodiment. [Figure 28] FIG. 2 is a diagram showing the structure of program data. [Figure 29] FIG. 2 is a structural diagram of asset data. [Diagram 30] A diagram showing the data structure of a PA message. [Diagram 31] A diagram showing the data structure of MMT_general_location_info. [Diagram 32] FIG. 2 is a diagram showing the data structure of a PLT. [Diagram 33] FIG. 13 is a diagram illustrating the meaning of location types. [Diagram 34] 13 is a diagram illustrating the data structure of an MPU presentation area designation descriptor. [Figure 35A] 13A to 13C are diagrams illustrating a presentation operation according to the third embodiment. [Figure 35B] 13A to 13C are diagrams illustrating a presentation operation according to the third embodiment. [Figure 36A] A diagram showing the data structure of an LCT expiration date descriptor. [Figure 36B] FIG. 13 is a diagram illustrating the data structure of a layout validity period descriptor. [Figure 36C] 13 is a diagram showing the data structure of a presentation area expiration date descriptor. [Figure 37] 13 is a diagram showing the data structure of a common presentation area information descriptor. [Figure 38] A diagram showing the meaning of full_set_flag. [Figure 39] 13 is a diagram showing the data structure of an overlapping presentation area designation descriptor. [Diagram 40] 13A to 13C are diagrams illustrating a presentation operation according to the third embodiment. [Diagram 41] 13A to 13C are diagrams illustrating a presentation operation according to the third embodiment. [Diagram 42] FIG. 13 is a diagram illustrating the data structure of a dependency descriptor. [Diagram 43] 13A to 13C are diagrams illustrating a presentation operation according to the third embodiment. [Diagram 44]FIG. 13 is a diagram illustrating a data structure of a modified example of a dependency descriptor. [Diagram 45] FIG. 13 is a diagram showing the meaning of dependency_type. [Figure 46] 13A to 13C are diagrams illustrating a presentation operation according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. Example 1

[0010] [System Configuration] 1 is a system configuration diagram showing an example of a broadcast communication system including a broadcast receiving device of this embodiment. The broadcast communication system of this embodiment is composed of a broadcast receiving device 100, an antenna 100a, a broadband network such as the Internet 200, a router device 200r, an access point 200a, a radio tower 300t of a broadcast station, a broadcast satellite (or a communication satellite) 300s, a broadcast station server 300, a service provider server 400, other application servers 500, a mobile telephone communication server 600, a base station 600b of a mobile telephone communication network, and a mobile information terminal 700.

[0011] The broadcast receiving device 100 receives broadcast waves transmitted from a radio tower 300t via a broadcast satellite (or communication satellite) 300s and an antenna 100a. Alternatively, the broadcast waves transmitted from the radio tower 300t may be received directly from the antenna 100a without passing through the broadcast satellite (or communication satellite) 300s. The broadcast receiving device 100 can also be connected to the Internet 200 via a router device 200r, and can transmit and receive data by communicating with each server device on the Internet 200 and other communication devices.

[0012] The router device 200r is connected to the Internet 200 by wired communication, and is connected to the broadcast receiving device 100 by wired communication or wireless communication, and to the mobile information terminal 700 by wireless communication. The wireless communication may use a method such as Wi-Fi (registered trademark). This allows each server device on the Internet 200 and other communication devices to transmit and receive data to and from the broadcast receiving device 100 and the mobile information terminal 700 via the router device 200r. Note that the communication between the broadcast receiving device 100 and the mobile information terminal 700 may be performed directly using a method such as BlueTooth (registered trademark) or NFC (Near Field Communication) without going through the router device 200r.

[0013] The radio tower 300t is a broadcasting facility of a broadcasting station, and transmits broadcast waves including encoded data of broadcast programs, subtitle information, other applications, general-purpose data, and the like. The broadcasting satellite (or communication satellite) 300s is a repeater that receives broadcast waves transmitted from the radio tower 300t of the broadcasting station, performs appropriate frequency conversion, and then retransmits the broadcast waves to the antenna 100a connected to the broadcast receiving device 100. The broadcasting station is also assumed to have a broadcasting station server 300. The broadcasting station server 300 is assumed to store broadcast programs (video content, etc.) and metadata of each broadcast program, such as program title, program ID, program summary, performer information, broadcast date and time, and to provide the video content and each metadata to a service provider based on a contract. The video content and each metadata may be provided to the service provider through an API (Application Programming Interface) provided in the broadcasting station server 300.

[0014] The service provider server 400 is a server device prepared by a service provider, and is capable of providing various services linked to broadcast programs distributed from a broadcast station. The service provider server 400 also stores, manages, and distributes video content and metadata provided by the broadcast station server 300, and various content and applications linked to broadcast programs. The service provider server 400 also has a function of searching for and providing a list of available content and applications in response to inquiries from a television receiver or the like. The storage, management, and distribution of the content and metadata and the storage, management, and distribution of the applications may be performed by different server devices. The broadcast station and the service provider may be the same or different. A plurality of service provider servers 400 may be prepared for each different service. The broadcast station server 300 may also have the functions of the service provider server 400.

[0015] The other application servers 500 are known server devices that store, manage, and distribute other general applications, operating programs, content, data, etc. There may be a plurality of other application servers 500 on the Internet 200.

[0016] The mobile telephone communication server 600 is connected to the Internet 200, and is also connected to the mobile information terminal 700 via a base station 600b. The mobile telephone communication server 600 manages telephone communication (calls) and data transmission / reception of the mobile information terminal 700 via the mobile telephone communication network, and enables data transmission / reception by communication between the mobile information terminal 700 and each server device on the Internet 200 and other communication devices. The communication between the base station 600b and the mobile information terminal 700 may be performed by a W-CDMA (Wideband Code Division Multiple Access) (registered trademark) system, a GSM (Global System for Mobile communications) (registered trademark) system, a LTE (Long Term Evolution) system, or other communication system.

[0017] The mobile information terminal 700 has a function of telephone communication (call) and data transmission / reception via a mobile telephone communication network, and a function of wireless communication by Wi-Fi (registered trademark) or the like. The mobile information terminal 700 can be connected to the Internet 200 via the router device 200r or the access point 200a, or via a base station 600b of the mobile telephone communication network and a mobile telephone communication server 600, and can transmit and receive data by communication with each server device on the Internet 200 and other communication devices. The access point 200a is connected to the Internet 200 by wired communication, and is connected to the mobile information terminal 700 by wireless communication. The wireless communication may use a method such as Wi-Fi (registered trademark). The communication between the mobile information terminal 700 and the broadcast receiving device 100 may be performed via the access point 200a, the Internet 200, and the router device 200r, or via the base station 600b, the mobile telephone communication server 600, the Internet 200, and the router device 200r.

[0018] [Outline of the MMT method] The broadcast receiving device 100 shown in Fig. 1 is a television receiver that is compatible with MMT (MPEG Media Transport) instead of TS (Transport Stream) (hereinafter referred to as MPEG2-TS) defined in the MPEG (Moving Picture Experts Group)-2 system, which is widely used in conventional digital broadcasting systems, as a media transport method for transmitting data such as video and audio. The television receiver may be compatible with both MPEG2-TS and MMT.

[0019] MPEG2-TS is characterized by multiplexing the video, audio, and other components that make up a program into a single stream along with control signals and clocks. As the clock is also treated as a single stream, it is suitable for transmitting a single piece of content over a single transmission path with guaranteed transmission quality, and has been adopted in many conventional digital broadcasting systems. However, in recent years, there has been a diversification of content, diversification of devices that use content, diversification of transmission paths for distributing content, diversification of content storage environments, and other changes in the content distribution environment. As a result, MPEG2-TS has limitations in its functionality. Therefore, a new media transport method, MMT, has been established.

[0020] FIG. 2A shows an example of an outline of an encoded signal in the MMT of this embodiment. As shown in the figure, the MMT of this embodiment has an MFU (Media Fragment Unit), an MPU (Media Processing Unit), an MMTP (MMT Protocol) payload, and an MMTP packet as elements constituting an encoded signal. The MFU is a format for transmitting video, audio, etc., and may be configured in NAL (Network Abstraction Layer) unit units or access unit units. The MPU may be configured with MPU metadata including information on the entire MPU configuration, movie fragment metadata including information on the encoded media data, and sample data that is the encoded media data. It is also assumed that the MFU can be extracted from the sample data. In addition, in the case of media such as video components and audio components, the presentation time and the decoding time may be specified in MPU units or access unit units. FIG. 2B shows an example of the configuration of an MPU.

[0021] An MMTP packet is composed of a header section and an MMTP payload, and transmits control information for the MFU and MMT. The MMTP payload is equipped with a payload header according to the contents (data unit) stored in the payload section. FIG. 2C shows an example of an overview of constructing an MFU from a video / audio signal, storing it in the MMTP payload, and constructing an MMTP packet. For video signals that are encoded using interframe prediction, it is desirable to configure the MPU in GOP (Group Of Pictures) units. If the size of the MFU to be transmitted is small, one MFU may be stored in one payload section, or multiple MFUs may be stored in one payload section. If the size of the MFU to be transmitted is large, one MFU may be divided and stored in multiple payload sections. In addition, the MMTP packet may be protected using a technique such as AL-FEC (Application Layer Forward Error Correction) or ARQ (Automatic Repeat Request) to recover packet loss on the transmission path.

[0022] In the broadcasting system of this embodiment, MPEG-H HEVC (High Efficiency Video Coding) is used as the video coding method, and MPEG-4 AAC (Advanced Audio Coding) or MPEG-4 ALS (Audio Lossless Coding) is used as the audio coding method. The coded data of the video and audio of the broadcast program coded by each of the above methods is in the format of MFU or MPU, and is further loaded on the MMTP payload to be MMTP packetized and transmitted in IP (Internet Protocol) packets. In addition, data content related to the broadcast program may also be in the format of MFU or MPU, and further loaded on the MMTP payload to be MMTP packetized and transmitted in IP packets. As the data content transmission method, four types are prepared: a subtitle / superimposed transmission method used for streaming data synchronized with broadcasting, an application transmission method used for data transmission asynchronous with broadcasting, an event message transmission method used for synchronous / asynchronous message notification to applications running on a television receiver, and a general-purpose data transmission method for transmitting other general-purpose data in a synchronous / asynchronous manner.

[0023] For the transmission of MMTP packets, UDP / IP (User Datagram Protocol / Internet Protocol) is used on the broadcast transmission path, and UDP / IP or TCP / IP (Transmission Control Protocol / Internet Protocol) is used on the communication line. In addition, the TLV (Type Length Value) multiplexing method is used on the broadcast transmission path for efficient transmission of IP packets. An example of a protocol stack for the broadcasting system of this embodiment is shown in Figure 3. In the figure, (A) is an example of a protocol stack on the broadcast transmission path, and (B) is an example of a protocol stack on the communication line.

[0024] In the broadcasting system of this embodiment, a mechanism for transmitting two types of control information, MMT-SI (MMT-Signaling Information) and TLV-SI (TLV-Signaling Information), is provided. MMT-SI is control information that indicates the configuration of a broadcast program, etc. It is in the form of an MMT control message, placed on an MMTP payload, packetized as an MMTP packet, and transmitted in an IP packet. TLV-SI is control information related to multiplexing of IP packets, and provides information for channel selection and correspondence information between IP addresses and services.

[0025] In addition, in broadcasting systems using MMT, time information is also transmitted to provide absolute time. While MPEG2-TS indicates the display time of components based on a different clock for each TS, MMT indicates the display time of components based on Coordinated Universal Time (UTC). These mechanisms enable terminal devices to synchronize and display components transmitted from different transmission points over different transmission paths. IP packets in NTP (Network Time Protocol) format are used to provide UTC.

[0026] [Control information for broadcasting systems using MMT] In the broadcast reception system compatible with the broadcast reception apparatus 100 of the present embodiment, as described above, as control information, TLV-SI related to the TLV multiplexing method for multiplexing IP packets and MMT-SI related to MMT which is a media transport method are prepared. TLV-SI provides information for the broadcast reception apparatus 100 to demultiplex IP packets multiplexed on a broadcast transmission path. TLV-SI is composed of a "table" and a "descriptor". The "table" is transmitted in section format, and the "descriptor" is arranged within the "table". MMT-SI is transmission control information indicating information related to the configuration of MMT packages and broadcast services. MMT-SI is composed of three layers: a "message" storing a "table" and a "descriptor", a "table" having elements and attributes indicating specific information, and a "descriptor" indicating more detailed information. An example of the hierarchical configuration of the control information used in the broadcast system of the present embodiment is shown in FIG. 4.

[0027] FIG. 5A shows a list of "tables" used in TLV-SI of the broadcast system compatible with the broadcast reception apparatus 100 of the present embodiment. In the present embodiment, the following are used as the "tables" of TLV-SI.

[0028] (1) TLV-NIT The Network Information Table for TLV (TLV-NIT) represents information regarding the physical configuration of a TLV stream transmitted by a network and the characteristics of the network itself.

[0029] (2) AMT The Address Map Table (AMT) provides a list of multicast groups of IP packets constituting each service transmitted in a network.

[0030] (3) Table set by the operator In addition, it is possible to prepare a table independently set by a service provider or the like.

[0031] <Descriptors used in TLV-SI> Fig. 5B shows a list of "descriptors" arranged in the TLV-SI of the broadcast system to which the broadcast receiving apparatus 100 of this embodiment corresponds. In this embodiment, the following are used as the "descriptors" of TLV-SI.

[0032] (1) Service list descriptor The service list descriptor provides a list of services by service identification and service format type.

[0033] (2) Satellite distribution system descriptor The satellite distribution system descriptor indicates the physical conditions of the satellite transmission path.

[0034] (3) System management descriptor The system management descriptor is used to distinguish between broadcast and non-broadcast.

[0035] (4) Network name descriptor The network name descriptor describes the network name with alphanumeric characters.

[0036] (5) Descriptor set by the operator In addition, it is possible to prepare descriptors independently set by a service provider or the like.

[0037] <Messages used in MMT-SI> Fig. 6A shows a list of "messages" used in the MMT-SI of the broadcast system to which the broadcast receiving apparatus 100 of this embodiment corresponds. In this embodiment, the following are used as the "messages" of MMT-SI.

[0038] (1) PA message The Package Access (PA) message is used to transmit various tables.

[0039] (2) M2 Section Message The M2 section message is used to transmit the section extension format of MPEG-2 Systems.

[0040] (3) CA Message The CA message is used to transmit a table for identifying the restricted reception method.

[0041] (4) M2 Short Section Message The M2 short section message is used to transmit the short section format of MPEG-2 Systems.

[0042] (5) Data Transmission Message The data transmission message is a message that stores a table related to data transmission.

[0043] (6) Message Set by Operator In addition, it is possible to prepare messages independently set by service providers and the like.

[0044] <Tables Used in MMT-SI> Figure 6B shows a list of the 'tables' used in the MMT-SI of the broadcast system corresponding to the broadcast receiving apparatus 100 of the present embodiment. The table is control information having elements and attributes indicating specific information, and is to be stored in a message and transmitted in an MMTP packet. Note that the message storing the table may be determined according to the table. In the present embodiment, the following are used as the 'tables' of MMT-SI.

[0045] (1) MPT The MMT package table (MMT Package Table: MPT) provides information constituting a package such as a list of assets and the position of the assets on the network. The MPT may be stored in a PA message.

[0046] (2) PLT The package list table (PLT) indicates a list of IP data flows and packet IDs that transmit PA messages of MMT packages provided as broadcast services, and IP data flows that transmit IP services. The PLT may be stored in the PA message.

[0047] (3)LCT The Layout Configuration Table (LCT) is used to associate layout information for presentation with a layout number. The LCT can be stored in the PA message.

[0048] (4)ECM An Entitlement Control Message (ECM) is common information consisting of program information and control information, and delivers key information for descrambling, etc. The ECM may be stored in an M2 section message.

[0049] (5) EMM The Entitlement Management Message (EMM) transmits individual information including contract information for each subscriber and key information for decrypting ECM (common information). The EMM may be stored in the M2 section message.

[0050] (6) CAT (MH) The Conditional Access Table (CAT) (MH) is used to store a descriptor for identifying a conditional access method. The CAT (MH) may be stored in a CA message.

[0051] (7)DCM The Download Control Message (DCM) transmits key-related information including a key for decrypting a transmission line encryption for downloading. The DCM may be stored in the M2 section message.

[0052] (8)DMM The Download Management Message (DMM) transmits key-related information such as a download key for decrypting the DCM. The DMM may be stored in an M2 section message.

[0053] (9)MH-EIT The MH-Event Information Table (MH-EIT) is time-series information on events included in each service. The MH-EIT may be stored in an M2 section message.

[0054] (10)MH-AIT The MH-Application Information Table (MH-AIT) stores all information about the application and the required activation state of the application, etc. The MH-AIT may be stored in the M2 section message.

[0055] (11)MH-BIT The MH-BIT (MH Broadcaster Information Table) is used to present information about broadcasters present on the network. The MH-BIT may be stored in an M2 section message.

[0056] (12)MH-SDTT The MH-Software Download Trigger Table (MH-SDTT) is used for download notification information. The MH-SDTT may be stored in the M2 section message.

[0057] (13)MH-SDT The MH-Service Description Table (MH-SDT) has sub-tables that represent services included in a specific TLV stream, and transmits information about the organization channel, such as the organization channel name, the broadcaster name, etc. The MH-SDT may be stored in the M2 section message.

[0058] (14)MH-TOT The MH-Time Offset Table (MH-TOT) carries JST time and date (Modified Julian Date) information. The MH-TOT may be stored in the M2 short section message.

[0059] (15)MH-CDT The MH-Common Data Table (MH-CDT) is used to transmit common data to be stored in non-volatile memory in section format for all receivers that receive this. The MH-CDT may be stored in an M2 section message.

[0060] (16) DDM table A data directory management table (DDM table) provides a directory structure of files that configure an application in order to separate the file structure of the application from the structure for file transmission. The DDM table may be stored in a data transmission message.

[0061] (17) DAM table The Data Asset Management Table (DAM table) provides the configuration of MPUs in an asset and version information for each MPU. The DAM table can be stored in a data transmission message.

[0062] (18) DCC table The Data Content Configuration Table (DCC table) provides configuration information of files as data content in order to achieve flexible and effective cache control. The DCC table may be stored in a data transmission message.

[0063] (19)EMT The Event Message Table (EMT) is used to transmit information related to event messages. The EMT may be stored in an M2 section message.

[0064] (20)Tables set by the operator In addition, it is possible to prepare tables independently set by service providers and the like.

[0065] <Descriptors used in MMT-SI> Figures 6C and 6D show a list of "descriptors" arranged in the MMT-SI of the broadcast system corresponding to the broadcast receiving apparatus 100 of the present embodiment. A descriptor is control information that provides more detailed information and is assumed to be arranged in a table. Note that the table in which the descriptor is arranged may be determined according to the descriptor. In the present embodiment, the following are used as the "descriptors" of MMT-SI.

[0066] (1) Asset group descriptor The asset group descriptor provides the group relationship of assets and the priority within the group. The asset group descriptor may be arranged in the MPT.

[0067] (2) Event package descriptor The event package descriptor provides the correspondence between events representing programs and packages. The event package descriptor may be arranged in the MH-EIT transmitted in an M2 section message.

[0068] (3) Background color specification descriptor The background color specification descriptor provides the background color of the backmost element in the layout specification. The background color specification descriptor may be placed in the LCT.

[0069] (4) MPU presentation area specification descriptor The MPU presentation area specification descriptor provides the location where the MPU is presented. The MPU presentation area specification descriptor can be placed in the MPT.

[0070] (5) MPU timestamp descriptor The MPU timestamp descriptor indicates the presentation time of the first access unit in presentation order in the MPU. The MPU timestamp descriptor may be placed in the MPT.

[0071] (6) Dependency Descriptor The dependency descriptor provides the asset IDs of the dependent assets. The dependency descriptor can be placed in the MPT.

[0072] (7) Access control descriptor The access control descriptor provides information for identifying the conditional access method. The access control descriptor may be placed in the MPT or CAT (MH).

[0073] (8) Scrambling method descriptor The scrambling method descriptor provides information for identifying the encryption target and the type of encryption algorithm used during scrambling. The scrambling method descriptor may be placed in the MPT or CAT(MH).

[0074] (9) Message authentication method descriptor The message authentication scheme descriptor provides information for identifying a message authentication scheme when performing message authentication. The message authentication scheme descriptor can be placed in the MPT or CAT(MH).

[0075] (10) Emergency Information Descriptor (MH) The emergency information descriptor (MH) is used when an emergency alert is broadcast. The emergency information descriptor (MH) may be placed in the MPT.

[0076] (11) MH-MPEG-4 Audio Descriptor The MH-MPEG-4 Audio Descriptor is used to describe basic information for specifying the coding parameters of an ISO / IEC 14496-3 (MPEG-4 Audio) audio stream. The MH-MPEG-4 Audio Descriptor may be placed in the MPT.

[0077] (12) MH-MPEG-4 Audio Extension Descriptor The MH-MPEG-4 Audio Extension Descriptor is used to describe the profile and level of the MPEG-4 audio stream and the encoding method specific settings. The MH-MPEG-4 Audio Extension Descriptor may be placed in the MPT.

[0078] (13) MH-HEVC Video Descriptor The MH-HEVC video descriptor is used to describe basic coding parameters of a video stream (HEVC stream) of ITU-T Recommendation H.265|ISO / IEC 23008-2. The MH-HEVC video descriptor may be placed in the MPT.

[0079] (14) MH-Link Descriptor The MH-Link Descriptor identifies the service that will be provided if a viewer requests additional information related to a particular listing in the program service information system. The MH-Link Descriptor may be located in the MPT, MH-EIT, MH-SDT, etc.

[0080] (15) MH-Event Group Descriptor The MH-Event Group Descriptor is used to indicate that multiple events are grouped when there is a relationship between the events. The MH-Event Group Descriptor may be placed in the MH-EIT.

[0081] (16) MH-Service List Descriptor The MH-Service List Descriptor provides a list of services by service identification and service type type. The MH-Service List Descriptor may be located in the MH-BIT.

[0082] (17)MH-Short Form Event Descriptor The MH-ShortEventDescriptor represents the event name and a short description of the event in text form. The MH-ShortEventDescriptor can be placed in the MH-EIT.

[0083] (18) MH-Extended Event Descriptor The MH-ExtendedEventDescriptor is used in addition to the MH-ShortEventDescriptor to provide a detailed description of the event. The MH-ExtendedEventDescriptor may be placed in the MH-EIT.

[0084] (19) Video Component Descriptor The video component descriptor indicates parameters and descriptions related to a video component, and is also used to express an elementary stream in a text format. The video component descriptor may be placed in the MPT or the MH-EIT.

[0085] (20) MH-Stream Identification Descriptor The MH-Stream Identification Descriptor is used to label the component stream of a service and to refer to the description indicated by the video component descriptor in the MH-EIT by this label. The MH-Stream Identification Descriptor may be placed in the MPT.

[0086] (21) MH-Content Descriptor The MH-Content Descriptor indicates the genre of the event. The MH-Content Descriptor may be placed in the MH-EIT.

[0087] (22) MH-Parental Rate Descriptor The MH-ParentalRating Descriptor is used to indicate age-based viewing restrictions and to extend to other restriction conditions. The MH-ParentalRating Descriptor may be placed in the MPT or the MH-EIT.

[0088] (23) MH-Audio Component Descriptor The MH-audio component descriptor indicates each parameter of an audio elementary stream and is also used to express the elementary stream in character form. The MH-audio component descriptor may be placed in the MPT or the MH-EIT.

[0089] (24)MH-Target Area Descriptor The MH-target region descriptor is used to describe the region targeted by a program or some streams that constitute a program. The MH-target region descriptor may be placed in the MPT.

[0090] (25) MH-Series Descriptor The MH-series descriptor is used to identify a series of programs. The MH-series descriptor may be placed in the MH-EIT.

[0091] (26)MH-SI Transmission Parameter Descriptor The MH-SI transmission parameter descriptor is used to indicate the transmission parameters of the SI. The MH-SI transmission parameter descriptor may be located in the MH-BIT.

[0092] (27)MH-Broadcaster Name Descriptor The MH-Broadcaster Name Descriptor describes the name of the broadcaster. The MH-Broadcaster Name Descriptor may be placed in the MH-BIT.

[0093] (28)MH-Service Descriptor The MH-service descriptor expresses the organization channel name and its operator name together with the service format type in character codes. The MH-service descriptor may be placed in the MH-SDT.

[0094] (29) IP Data Flow Descriptor The IP data flow descriptor provides information about the IP data flows that constitute a service. The IP data flow descriptor can be placed in the MH-SDT.

[0095] (30)MH-CA startup descriptor The MH-CA start descriptor describes start information for starting a CAS program on the CAS platform. The MH-CA start descriptor can be placed in the MPT or CAT (CA).

[0096] (31)MH-Type Descriptor The MH-Type Descriptor indicates the type of file transmitted by the application transmission method. The MH-Type Descriptor may be placed in the DAM table.

[0097] (32)MH-Info Descriptor The MH-Info Descriptor describes information about an MPU or an item. The MH-Info Descriptor can be placed in a DAM table.

[0098] (33)MH-Expire Descriptor The MH-Expire descriptor describes the expiration time of an item. The MH-Expire descriptor can be placed in the DAM table.

[0099] (34) MH-Compression Type Descriptor The MH-Compression Type Descriptor indicates that the item being transmitted is compressed, and indicates the compression algorithm and the number of bytes of the item before compression. The MH-Compression Type Descriptor may be placed in the DAM table.

[0100] (35) MH-Data Encoding Method Descriptor The MH-Data-Encoding Descriptor is used to identify a data encoding scheme. The MH-Data-Encoding Descriptor may be placed in the MPT.

[0101] (36) UTC-NPT reference descriptor The UTC-NPT reference descriptor is used to convey the relationship between NPT (Normal Play Time) and UTC. The UTC-NPT reference descriptor can be placed in the EMT.

[0102] (37) Event Message Descriptor The event message descriptor conveys information about the event message in general. The event message descriptor can be located in the EMT.

[0103] (38)MH-Local Time Offset Descriptor The MH-Local Time Offset Descriptor is used when daylight saving time is implemented, to give a certain offset value to the actual time (e.g., UTC+9 hours) and the display time to the human system. The MH-Local Time Offset Descriptor may be placed in the MH-TOT.

[0104] (39)MH-Component Group Descriptor The MH-component group descriptor defines and identifies a combination of components within an event. The MH-component group descriptor can be placed in the MH-EIT.

[0105] (40) MH-Logo Transmission Descriptor The MH-Logo Transmission Descriptor is used to describe a simple logo character string, pointing to a logo in CDT format, etc. The MH-Logo Transmission Descriptor may be placed in the MH-SDT.

[0106] (41) MPU Extended Timestamp Descriptor The MPU extension timestamp descriptor provides the decoding time of an access unit in the MPU. The MPU extension timestamp descriptor may be placed in the MPT.

[0107] (42) MPU Download Content Descriptor The MPU download content descriptor is used to describe attribute information of content downloaded using the MPU. The MPU download content descriptor may be placed in the MH-SDTT.

[0108] (43)MH-Network Download Content Descriptor The MH-Network Download Content Descriptor is used to describe attribute information of content downloaded using a network. The MH-Network Download Content Descriptor may be placed in the MH-SDTT.

[0109] (44)MH-Application Descriptor The MH-application descriptor describes information about an application. The MH-application descriptor may be placed in the MH-AIT.

[0110] (45) MH-Transmission Protocol Descriptor The MH-transmission protocol descriptor is used to specify a transmission protocol such as broadcasting or communication, and to indicate location information of an application that depends on the transmission protocol. The MH-transmission protocol descriptor may be placed in the MH-AIT.

[0111] (46)MH-Simple Application Location Descriptor The MH-simple application location descriptor is written to indicate details of where to obtain the application. The MH-simple application location descriptor may be placed in the MH-AIT.

[0112] (47)MH-Application Boundary Authority Setting Descriptor The MH-application boundary authority setting descriptor is described to set an application boundary and to set authority of broadcast resource access for each area (URL). The MH-application boundary authority setting descriptor may be placed in the MH-AIT.

[0113] (48)MH-Boot Priority Information Descriptor The MH-launch priority information descriptor is written to specify the launch priority of an application. The MH-launch priority information descriptor may be placed in the MH-AIT.

[0114] (49)MH-Cache Information Descriptor The MH-cache information descriptor is written for use in cache control when the resources constituting an application are cached and held when the application is expected to be reused. The MH-cache information descriptor may be placed in the MH-AIT.

[0115] (50)MH-Probabilistic Adaptive Delay Descriptor The MH-probabilistic application delay descriptor is described to delay the timing of application control by a probabilistically set delay amount, assuming load balancing of server access for application acquisition. The MH-probabilistic application delay descriptor may be placed in the MH-AIT.

[0116] (51) Link destination PU descriptor The link destination PU descriptor describes other presentation units that may be transitioned from the presentation unit (PU). The link destination PU descriptor may be placed in the DCC table.

[0117] (52) Lock cache specification descriptor The lock cache specification descriptor describes the specification of a file to be cached and locked in the presentation unit. The lock cache specification descriptor may be arranged in the DCC table.

[0118] (53) Unlock cache specification descriptor The unlock cache specification descriptor describes the specification of a file to be unlocked among the files locked in the presentation unit. The unlock cache specification descriptor may be arranged in the DCC table.

[0119] (54) Descriptor set by the operator In addition, it is possible to prepare descriptors independently set by service providers and the like.

[0120] <Relationship between data transmission and each control information in the MMT method> Here, with reference to FIG. 6E, the relationship between data transmission and a representative table in the broadcast system corresponding to the broadcast receiving apparatus 100 of the present embodiment will be described.

[0121] In the broadcast system corresponding to the broadcast receiving apparatus 100 of the present embodiment, data can be transmitted through a plurality of paths, such as a TLV stream via a broadcast transmission path and an IP data flow via a communication line. The TLV stream includes TLV-SIs such as TLV-NIT and AMT, and an IP data flow which is a data flow of IP packets. The IP data flow includes a video asset including a series of video MPUs and an audio asset including a series of audio MPUs. Similarly, the IP data flow may include a subtitle asset including a series of subtitle MPUs, a character super asset including a series of character super MPUs, a data asset including a series of data MPUs, and the like. These various assets are associated in units of "packages" by an MPT (MMT package table) stored in a PA message and transmitted. Specifically, the association is made by describing a package ID (corresponding to the 'MMT_package_id_byte' parameter shown in FIG. 17 described later) and an asset ID of each asset included in the package (corresponding to the 'asset_id_byte' parameter shown in FIG. 17 described later) in the MPT.

[0122] The assets constituting a package can be only assets in a TLV stream, but as shown in Fig. 6E, they can also include assets transmitted in an IP data flow of a communication line. This can be achieved by including location information of each asset included in the package (corresponding to "MMT_general_location_info()" shown in Fig. 17 described later) in the MPT, enabling the broadcast receiving device 100 of this embodiment to grasp the reference destination of each asset. Specifically, by changing the value of the "MMT_general_location_infonolocation_type" parameter placed in the location information, (1) Data multiplexed in the same IP data flow as MPT (location_type=0x00) (2) Data multiplexed in IPv4 data flows (location_type=0x01) (3) Data multiplexed in IPv6 data flows (location_type=0x02) (4) Data multiplexed into the broadcast MPEG2-TS (location_type=0x03) (5) Data multiplexed in MPEG2-TS format within the IP data flow (location_type=0x04) (6) Data at the specified URL (location_type=0x05) It is possible to configure the broadcast receiving device 100 so that it can refer to various types of data transmitted via various transmission paths such as the above.

[0123] Among the above-mentioned reference destinations, (1) is, for example, an IP data flow received via a digital broadcast signal received by the tuner / demodulator unit 131 of the broadcast receiving device 100 in FIG. 7A, which will be described later. When the MPT is also included in the IP data flow on the communication line side and transmitted, the reference destination of (1) may be an IP data flow received by the LAN communication unit 121, which will be described later, via the communication line. Also, the above (2), (3), (5), and (6) are IP data flows received by the LAN communication unit 121, which will be described later, via the communication line. Also, the above (4) can be used, for example, in the case of a broadcast receiving device having both a receiving function for receiving digital broadcast signals using the MMT method and a receiving function for receiving digital broadcast signals using the MPEG2-TS method, such as the broadcast receiving device 800 of the second embodiment shown in FIG. 24, which will be described later, when referring to data multiplexed in the MPEG2-TS received by the receiving function for receiving digital broadcast signals using the MPEG2-TS method, based on the location information of the MPT included in the digital broadcast signal using the MMT method ("MMT_general_location_info()").

[0124] Although the data constituting a "package" is specified in this manner, in the broadcasting system compatible with the broadcast receiving device 100 of this embodiment, a series of data in units of this "package" is treated as a "service" unit of digital broadcasting.

[0125] Furthermore, the MPT describes the presentation time information of each MPU designated by the MPT (corresponding to the "mpu_presentation_time" parameter shown in FIG. 13B described later), and using this presentation time information, it becomes possible to present (display, output, etc.) multiple MPUs designated by the MPT in a linked manner based on a clock based on NTP, which is time information in UTC notation. Presentation control of various data using the clock based on the NTP will be described later.

[0126] The data transmission method of this embodiment shown in Fig. 6E further includes the concept of an "event". An "event" is a concept indicating a so-called "program" handled by the MH-EIT included in the M2 section message and sent. Specifically, in a "package" indicated by an event package descriptor stored in the MH-EIT, a series of data included in a period of time (corresponding to the "start_time" parameter shown in Fig. 21 described later) from the start time stored in the MH-EIT (corresponding to the "start_time" parameter shown in Fig. 21 described later) is data included in the concept of the "event". The MH-EIT can be used in various processes (for example, program guide generation process, control of recording and viewing reservations, copyright management process such as temporary storage) on an "event" basis in the broadcast receiving device 100 of this embodiment.

[0127] [Hardware configuration of broadcast receiving device] 7A is a block diagram showing an example of the internal configuration of the broadcast receiving device 100. The broadcast receiving device 100 is composed of a main control unit 101, a system bus 102, a ROM 103, a RAM 104, a storage (accumulation) unit 110, a LAN communication unit 121, an extension interface unit 124, a digital interface unit 125, a tuner / demodulation unit 131, a separation unit 132, a video decoder 141, a video color gamut conversion unit 142, an audio decoder 143, a superimposed text decoder 144, a subtitle decoder 145, a subtitle synthesis unit 146, a subtitle color gamut conversion unit 147, a data decoder 151, a cache unit 152, an application control unit 153, a browser unit 154, an application color gamut conversion unit 155, a sound source unit 156, a video synthesis unit 161, a monitor unit 162, a video output unit 163, an audio synthesis unit 164, a speaker unit 165, an audio output unit 166, and an operation input unit 170.

[0128] The main control unit 101 is a microprocessor unit that controls the entire broadcast receiving device 100 in accordance with a predetermined operation program. The system bus 102 is a data communication path for transmitting and receiving data between the main control unit 101 and each operation block in the broadcast receiving device 100.

[0129] The ROM (Read Only Memory) 103 is a non-volatile memory in which a basic operation program such as an operating system and other operation programs are stored, and a rewritable ROM such as an EEPROM (Electrically Erasable Programmable ROM) or a flash ROM is used. The ROM 103 may store operation setting values ​​necessary for the operation of the broadcast receiving device 100. The RAM (Random Access Memory) 104 serves as a work area when the basic operation program and other operation programs are executed. The ROM 103 and the RAM 104 may be integral with the main control unit 101. Also, the ROM 103 may not be an independent configuration as shown in FIG. 7A, but may use a part of the storage area in the storage (accumulation) unit 110.

[0130] The storage (accumulation) unit 110 stores the operation program and operation setting values ​​of the broadcast receiving device 100, personal information of the user of the broadcast receiving device 100, etc. It can also store operation programs downloaded via the Internet 200 and various data created by the operation programs. It can also store content such as moving images, still images, and audio acquired from broadcast waves or downloaded via the Internet 200. A part of the area of ​​the storage (accumulation) unit 110 may replace all or part of the functions of the ROM 103. The storage (accumulation) unit 110 needs to hold the stored information even when power is not supplied from the outside to the broadcast receiving device 100. Therefore, for example, devices such as non-volatile semiconductor element memories such as flash ROM and SSD (Solid State Drive), magnetic disk drives such as HDD (Hard Disk Drive), etc. are used.

[0131] It should be noted that the operation programs stored in the ROM 103 and the storage (accumulation) unit 110 can be added, updated, and have their functions expanded by downloading from each server device on the Internet 200 .

[0132] The LAN (Local Area Network) communication unit 121 is connected to the Internet 200 via the router device 200r, and transmits and receives data to and from each server device and other communication devices on the Internet 200. It also acquires the MMT data string (or a part of it) of a program transmitted via a communication line. The connection to the router device 200r may be a wired connection or a wireless connection such as Wi-Fi (registered trademark). The LAN communication unit 121 includes an encoding circuit, a decoding circuit, and the like. The broadcast receiving device 100 may further include other communication units such as a BlueTooth (registered trademark) communication unit, an NFC communication unit, and an infrared communication unit.

[0133] The tuner / demodulator 131 receives broadcast waves transmitted from a radio tower 300t via the antenna 100a, and tunes (selects) a channel of a service desired by the user under the control of the main controller 101. Furthermore, the tuner / demodulator 131 demodulates the received broadcast signal to obtain an MMT data string. Note that, although the example shown in FIG. 7A illustrates a configuration with one tuner / demodulator, the broadcast receiving device 100 may be configured to include multiple tuners / demodulators for the purpose of simultaneous display of multiple screens, recording of a counter program, etc.

[0134] The separation unit 132 is an MMT decoder, and distributes the video data string, audio data string, superimposed text data string, subtitle data string, etc., which are real-time presentation elements, to the video decoder 141, audio decoder 143, superimposed text data string, subtitle data string, etc., based on a control signal in the input MMT data string. The data input to the separation unit 132 may be an MMT data string transmitted via a broadcast transmission path and demodulated by the tuner / demodulator unit 131, or an MMT data string transmitted via a communication line and received by the LAN communication unit 121. The separation unit 132 also reproduces a multimedia application and file-based data, which is a component of the application, and temporarily stores the data in the cache unit 152. The separation unit 132 also extracts general-purpose data and outputs it to the data decoder 151 in order to use the data for streaming to the data or application used by a player that presents data other than video, audio, and subtitles. The separation unit 132 may also perform error correction and access restriction control on the input MMT data string based on the control of the main control unit 101.

[0135] The video decoder 141 decodes the video data string input from the separation unit 132 and outputs video information. The video color gamut conversion unit 142 performs color space conversion processing on the video information decoded by the video decoder 141 as necessary for video synthesis processing in the video synthesis unit 161. The audio decoder 143 decodes the audio data string input from the separation unit 132 and outputs the audio information. In addition, streaming data in, for example, MPEG-DASH (MPEG-Dynamic Adaptive Streaming over HTTP) format acquired from the Internet 200 via the LAN communication unit 121 may be input to the video decoder 141 and the audio decoder 143. In addition, a plurality of the video decoder 141, the video color gamut conversion unit 142, the audio decoder 143, etc. may be provided in order to simultaneously decode a plurality of types of video data strings and audio data strings.

[0136] The superimposed text decoder 144 decodes the superimposed text data string input from the separation unit 132 and outputs superimposed text information. The subtitle decoder 145 decodes the subtitle data string input from the separation unit 132 and outputs subtitle information. The superimposed text information output from the superimposed text decoder 144 and the subtitle information output from the subtitle decoder 145 are subjected to a synthesis process in the subtitle synthesis unit 146, and further, in the subtitle color gamut conversion unit 147, a color space conversion process is performed as necessary for the video synthesis process in the video synthesis unit 161. In this embodiment, among the services mainly based on text information presented simultaneously with the video of a broadcast program, those related to the content of the video are referred to as subtitles, and the rest are referred to as superimposed text. Furthermore, when there is no distinction between them, they are collectively referred to as subtitles.

[0137] The browser unit 154 presents the multimedia application file and its component file data acquired from the server device on the Internet 200 via the cache unit 152 or the LAN communication unit 121 in accordance with an instruction from the application control unit 153 that interprets the control information included in the MMT data string and the control information acquired from the server device on the Internet 200 via the LAN communication unit 121. The multimedia application file may be an HTML (Hyper Text Markup Language) document or a BML (Broadcast Markup Language) document, etc. The application information output from the browser unit 154 is further subjected to color space conversion processing in the application color gamut conversion unit 155 as necessary for video synthesis processing in the video synthesis unit 161. The browser unit 154 also plays back application audio information by influencing the sound source unit 156.

[0138] The video synthesis unit 161 receives the video information output from the video color gamut conversion unit 142, the subtitle information output from the subtitle color gamut conversion unit 147, the application information output from the application color gamut conversion unit 155, and the like, and performs processing such as selection and / or superimposition as appropriate. The video synthesis unit 161 includes a video RAM (not shown), and the monitor unit 162 and the like are driven based on the video information and the like input to the video RAM. The video synthesis unit 161 also performs scaling processing and superimposition processing of EPG (Electronic Program Guide) screen information created based on information such as MH-EIT included in MMT-SI, as necessary, based on the control of the main control unit 101. The monitor unit 162 is, for example, a display device such as a liquid crystal panel, and provides the video information selected and / or superimposed by the video synthesis unit 161 to the user of the broadcast receiving device 100. The video output unit 163 is a video output interface that outputs the video information selected and / or superimposed by the video synthesis unit 161.

[0139] The presentation function of the broadcast receiving device 100 of this embodiment is provided with a logical plane structure in order to display the multimedia service as intended by the provider. FIG. 7B shows an example of the configuration of the logical plane structure provided by the presentation function of the broadcast receiving device 100 of this embodiment. In the logical plane structure, a character superimposition plane for displaying character superimposition is arranged in the foreground, and a subtitle plane for displaying subtitles is arranged in the next layer. A multimedia plane for displaying broadcast video, multimedia applications, or their composite video is arranged in the third layer, and a background plane is arranged in the background. In the subtitle synthesis unit 146 and the video synthesis unit 161, drawing of character superimposition information on the character superimposition plane, drawing of subtitle information on the subtitle plane, drawing of video information, application information, etc. on the multimedia plane are performed. In addition, a background color is drawn on the background plane based on the LCT, etc. included in the MMT-SI. It is assumed that a plurality of multimedia planes in the third layer can be prepared according to the number of video decoders 141. However, even if there are a plurality of multimedia planes, application information, etc. output from the application color gamut conversion unit 155 is output only to the foreground multimedia plane.

[0140] The audio synthesis unit 164 receives the audio information output from the audio decoder 143 and the application audio information reproduced by the sound source unit 156, and performs processing such as appropriate selection and / or mixing. The speaker unit 165 provides the audio information selected and / or mixed by the audio synthesis unit 164 to the user of the broadcast receiving device 100. The audio output unit 166 is an audio output interface that outputs the audio information selected and / or mixed by the audio synthesis unit 164.

[0141] The expansion interface unit 124 is a group of interfaces for expanding the functions of the broadcast receiving device 100, and in this embodiment, is configured with an analog video / audio interface, a USB (Universal Serial Bus) interface, a memory interface, etc. The analog video / audio interface inputs analog video signals / audio signals from an external video / audio output device, outputs analog video signals / audio signals to an external video / audio input device, etc. The USB interface connects to a PC or the like to send and receive data. A HDD may be connected to record broadcast programs and content. A keyboard or other USB device may also be connected. The memory interface connects to a memory card or other memory medium to send and receive data.

[0142] The digital interface unit 125 is an interface that outputs or inputs encoded digital video data and / or digital audio data. The digital interface unit 125 is capable of outputting, as is, an MMT data string obtained by demodulation in the tuner / demodulator unit 131, an MMT data string acquired via the LAN communication unit 121, or mixed data of the MMT data strings. In addition, the digital interface unit 125 may control the MMT data string input to the separator 132. The output of digital content stored in the storage unit 110, or the storage of digital content in the storage unit 110 may be performed via the digital interface unit 125.

[0143] The digital interface unit 125 may be a DVI terminal, an HDMI (registered trademark) terminal, a Display Port (registered trademark) terminal, or the like, which outputs or inputs data in a format conforming to the DVI specification, the HDMI specification, the Display Port specification, or the like. It may output or input data in the form of serial data conforming to the IEEE1394 specification, or the like. It may also be configured as an IP interface that performs digital interface output via hardware such as Ethernet (registered trademark) or wireless LAN. In this case, the digital interface unit 125 and the LAN communication unit 121 may share the same hardware configuration.

[0144] The operation input unit 170 is an instruction input unit that inputs operation instructions to the broadcast receiving device 100, and in this embodiment, is configured with a remote control receiving unit that receives commands transmitted from a remote control (not shown) and an operation key with an array of button switches. Only one of them may be used. The operation input unit 170 may also be replaced by a touch panel that is placed over the monitor unit 162. It may also be replaced by a keyboard or the like connected to the extended interface unit 124. The remote control (not shown) may also be replaced by a mobile information terminal 700 equipped with a remote control command transmission function.

[0145] As described above, when the broadcast receiving device 100 is a television receiver or the like, the video output unit 163 and the audio output unit 166 are not essential components of the present invention. In addition to a television receiver, the broadcast receiving device 100 may be an optical disk drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disk drive recorder such as a HDD recorder, a STB (Set Top Box), or the like. It may be a PC (Personal Computer), a tablet terminal, a navigation device, a game machine, or the like, equipped with a digital broadcast receiving function or a broadcast communication linking function. When the broadcast receiving device 100 is a DVD recorder, a HDD recorder, a STB, or the like, the monitor unit 162 and the speaker unit 165 may not be provided. By connecting an external monitor and an external speaker to the video output unit 163 and the audio output unit 166 or the digital interface unit 125, the same operation as the broadcast receiving device 100 of this embodiment is possible.

[0146] [System configuration for clock synchronization / presentation synchronization of broadcast receiving devices] FIG. 7C is an example of a system configuration of clock synchronization / presentation synchronization in a broadcasting system compatible with the broadcast receiving device 100 of this embodiment. In the broadcasting system of this embodiment, UTC is transmitted from a broadcast sending system to a receiver (such as the broadcast receiving device 100 of this embodiment) in a 64-bit NTP timestamp format. In the NTP timestamp format, "seconds or more" of UTC are represented by 32 bits, and "less than a second" is represented by 32 bits. However, in reality, it is difficult to reproduce one second with 32-bit accuracy. For this reason, as a system clock for synchronizing a video system or a system clock for operating a clock in the NTP format, for example, a frequency of "2 to the 24th power" Hz (approximately 16.8 MHz) as shown in the figure may be used. Note that, considering that the system clock in the conventional broadcasting system was 27 MHz and that the hardware configuration of the receiver can be easily constructed, it is desirable to adopt a frequency of a power of 2, such as "2 to the 24th power" to "2 to the 28th power", as the system clock.

[0147] In addition, when the system clock is set to a frequency of a power of 2 such as "2 to the power of 24" to "2 to the power of 28" on the broadcast transmission system side or the receiver side as described above, the lower 8 to 4 bits in the NTP timestamp format transmitted from the broadcast transmission system side to the receiver side, which are not referenced by the PLL (Phase Locked Loop) system for regenerating the system clock or the NTP format clock, may be fixed to "0" or "1". In other words, if the system clock is "2 to the power of n" Hz (n=24 in the example of FIG. 7C), the lower "32-n" bits of the NTP timestamp format may be fixed to "0" or "1". Alternatively, the receiver side may process the lower "32-n" bits of the NTP timestamp format to be ignored.

[0148] When the broadcast transmission system receives time information in NTP format from an external source, it configures a PLL system with a 32+n-bit counter using a 2n-Hz VCO (Voltage Controlled Oscillator) to realize a transmission system clock that synchronizes with the externally provided time information. It also operates the entire signal processing system in synchronization with the 2n-Hz system clock. Furthermore, it periodically transmits the output of the transmission system clock to the receiver side as time information in NTP long format via the broadcast transmission path.

[0149] The receiver receives the time information in the NTP long format via the broadcast transmission path, and regenerates the receiving system clock by a PLL system based on a VCO of "2 to the power of n" Hz, just like the broadcast transmission system. This makes the receiving system clock synchronized with the broadcast transmission system. In addition, by operating the signal processing system of the receiver in synchronization with the system clock of "2 to the power of n" Hz, clock synchronization between the broadcast transmission system and the receiver is realized, enabling stable signal reproduction. In addition, the decoding time and presentation time for each presentation unit of the video / audio signal are set on the broadcast transmission system side based on the time information in the NTP format. Here, the MPT stored in the PA message transmitted by the broadcast signal stores the MPU timestamp descriptor shown in FIG. 13B described later. The "mpu_sequence_number (MPU sequence number)" parameter in the MPU timestamp descriptor in FIG. 13B indicates the sequence number of the MPU that describes the timestamp, and the "mpu_presentation_time (MPU presentation time)" parameter indicates the presentation time of the MPU in 64-bit NTP timestamp format. Therefore, the receiver can refer to the MPU timestamp descriptor stored in the MPT and control the presentation (display, output, etc.) timing of video signals, audio signals, subtitles, superimposed text, etc. for each MPU.

[0150] In addition, when focusing on the control of the decoding timing and presentation timing for each presentation unit of the above-mentioned video / audio signals, the synchronization of the video / audio signals can be ensured even with a clock of about 2 to the power of 16 Hz (approximately 65.5 KHz), and in this case, it is not necessary to refer to the lower 16 bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. In other words, if a clock of 2 to the power of m Hz generated by dividing the system clock, etc. is used to control the decoding timing and presentation timing, it is not necessary to refer to the lower 32-m bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. Therefore, the lower 32-m bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. may be fixed to "0" or "1".

[0151] [Software configuration of broadcast receiving device] 7D is a software configuration diagram of the broadcast receiving device 100 of this embodiment, and shows the software configuration in the ROM 103, the RAM 104, and the storage (accumulation) unit 110. In this embodiment, a basic operation program 1001 and other operation programs are stored in the ROM 103, and a receiving function program 1002 and other operation programs are stored in the storage (accumulation) unit 110. The storage (accumulation) unit 110 is also assumed to include a content storage area 1200 for storing content such as moving images, still images, and audio, an authentication information storage area 1300 for storing authentication information and the like required for accessing an external mobile terminal device or each server device, and various information storage areas for storing various other information.

[0152] A basic operation program 1001 stored in ROM 103 is loaded into RAM 104, and the main control unit 101 executes the loaded basic operation program to constitute a basic operation execution unit 1101. Similarly, a receiving function program 1002 stored in the storage (accumulation) unit 110 is loaded into RAM 104, and the main control unit 101 executes the loaded receiving function program to constitute a receiving function execution unit 1102. The RAM 104 also includes a temporary storage area for temporarily holding data created when each operation program is executed, as necessary.

[0153] In the following, for the sake of simplicity, the process of controlling each operation block by the main control unit 101 expanding the basic operation program 1001 stored in the ROM 103 into the RAM 104 and executing it will be described as the basic operation execution unit 1101 controlling each operation block. Similar descriptions will be used for the other operation programs.

[0154] The receiving function execution unit 1102 controls each operation block of the broadcast receiving device 100 to reproduce components such as video and audio transmitted in the broadcasting system of this embodiment. In particular, the transport processing unit 1102a mainly controls the MMT decoder function of the separation unit 132, and distributes the video data string and audio data string separated from the MMT data string to the corresponding decoding processing units. The AV decoding processing unit 1102b mainly controls the video decoder 141, the audio decoder 143, etc. The application processing unit 1102c mainly controls the cache unit 152, the application control unit 153, the browser unit 154, and the sound source unit 156. The superimposed text processing unit 1102d mainly controls the superimposed text decoder 144. The subtitle processing unit 1102e mainly controls the subtitle decoder 145. The general-purpose data processing unit 1102f mainly controls the data decoder 151. The EPG generation unit 1102g interprets the description contents of the MH-EIT etc. included in the MMT-SI to generate an EPG screen. The presentation processing unit 1102h mainly controls the video color gamut conversion unit 142, the subtitle synthesis unit 146, the subtitle color gamut conversion unit 147, the application color gamut conversion unit 155, the video synthesis unit 161, and the audio synthesis unit 164 based on the logical plane structure.

[0155] The operation programs may be stored in the ROM 103 and / or the storage (accumulation) unit 110 beforehand at the time of product shipment. After product shipment, the operation programs may be acquired from other application servers 500 or the like on the Internet 200 via the LAN communication unit 121. Moreover, the operation programs may be stored in a memory card, an optical disk, or the like and acquired via the expansion interface unit 124 or the like.

[0156] [Broadcasting server configuration] 8 is a block diagram showing an example of the internal configuration of the broadcast station server 300. The broadcast station server 300 is made up of a main control unit 301, a system bus 302, a RAM 304, a storage unit 310, a LAN communication unit 321, and a digital broadcast signal transmission unit 360.

[0157] The main control unit 301 is a microprocessor unit that controls the entire broadcast station server 300 in accordance with a predetermined operation program. The system bus 302 is a data communication path for transmitting and receiving data between the main control unit 301 and each operation block in the broadcast station server 300. The RAM 304 serves as a work area when each operation program is executed.

[0158] The storage unit 310 stores a basic operation program 3001, a broadcast content management / distribution program 3002, and a broadcast content sending program 3003, and further includes a broadcast content storage area 3200 and a metadata storage area 3300. The broadcast content storage area 3200 stores program content and the like of each broadcast program broadcast by a broadcast station. The metadata storage area 3300 stores metadata such as the program title, program ID, program summary, cast, broadcast date and time, and copy control information related to each program content of each of the broadcast programs.

[0159] In addition, the basic operation program 3001, broadcast content management / distribution program 3002, and broadcast content transmission program 3003 stored in the storage unit 310 are each expanded into RAM 304, and the main control unit 301 executes each of the expanded programs to form a basic operation execution unit 3101, a broadcast content management / distribution execution unit 3102, and a broadcast content transmission execution unit 3103.

[0160] In the following, for ease of explanation, the process in which the main control unit 301 loads the basic operation program 3001 stored in the storage unit 310 into the RAM 304 and executes it to control each operation block will be described as being performed by the basic operation execution unit 3101. Similar descriptions will be used for the other operation programs.

[0161] The broadcast content management / distribution execution unit 3102 manages the program contents and each metadata of each broadcast program stored in the broadcast content storage area 3200 and the metadata storage area 3300, and controls the provision of the program contents and each metadata of each broadcast program to the service provider based on a contract. Furthermore, when providing the program contents and each metadata of each broadcast program to the service provider, the broadcast content management / distribution execution unit 3102 may perform authentication processing of the service provider server 400 based on the contract as necessary.

[0162] The broadcast content transmission execution unit 3103 performs time schedule management, etc., when transmitting MMT data strings including program content of broadcast programs stored in the broadcast content storage area 3200 and program titles, program IDs, copy control information of program content, etc. of broadcast programs stored in the metadata storage area 3300 from the radio tower 300t via the digital broadcast signal transmission unit 360.

[0163] The LAN communication unit 321 is connected to the Internet 200, and communicates with a service provider server 400 on the Internet 200, etc. The LAN communication unit 321 is equipped with an encoding circuit, a decoding circuit, etc. The digital broadcast signal transmission unit 360 modulates an MMT data sequence composed of video data sequences, audio data sequences, program information data sequences, etc. of program contents of each broadcast program stored in the broadcast content storage area 3200, and transmits it as a digital broadcast wave via the radio tower 300t.

[0164] [Service provider server configuration] 9 is a block diagram showing an example of the internal configuration of the service provider server 400. The service provider server 400 is composed of a main control unit 401, a system bus 402, a RAM 404, a storage unit 410, and a LAN communication unit 421.

[0165] The main control unit 401 is a microprocessor unit that controls the entire service provider server 400 in accordance with a predetermined operation program. The system bus 402 is a data communication path for transmitting and receiving data between the main control unit 401 and each operation block in the service provider server 400. The RAM 404 serves as a work area when each operation program is executed.

[0166] The storage unit 410 stores a basic operation program 4001, a video content management / distribution program 4002, and an application management / distribution program 4004, and further includes a video content storage area 4200, a metadata storage area 4300, an application storage area 4400, and a user information storage area 4500. The video content storage area 4200 stores the program content of the broadcast program provided by the broadcast station server 300 as video content. It also stores the video content and the like produced by the service provider. The metadata storage area 4300 stores each metadata provided by the broadcast station server 300 and metadata related to the video content produced by the service provider. The application storage area 4400 stores various applications and the like for realizing services linked to the broadcast program to be distributed in response to requests from each television receiver. The user information storage area 4500 stores information (personal information, authentication information, and the like) related to users who are permitted to access the service provider server 400.

[0167] In addition, the basic operation program 4001, video content management / distribution program 4002, and application management / distribution program 4004 stored in the storage unit 410 are each expanded into RAM 404, and the main control unit 401 further executes the expanded basic operation program, video content management / distribution program, and application management / distribution program, thereby forming a basic operation execution unit 4101, a video content management / distribution execution unit 4102, and an application management / distribution execution unit 4104.

[0168] In the following, for ease of explanation, the process in which the main control unit 401 loads the basic operation program 4001 stored in the storage unit 410 into the RAM 404 and executes it to control each operation block will be described as the basic operation execution unit 4101 controlling each operation block. Similar descriptions will be used for the other operation programs.

[0169] The video content management / distribution execution unit 4102 acquires program contents and metadata of broadcast programs from the broadcast station server 300, manages the video contents and metadata stored in the video content storage area 4200 and the metadata storage area 4300, and controls the distribution of the video contents and metadata to each television receiver. Furthermore, the video content management / distribution execution unit 4102 may perform authentication processing of each television receiver as necessary when distributing the video contents and metadata to each television receiver. Furthermore, the application management / distribution execution unit 4104 manages applications stored in the application storage area 4400 and controls the distribution of each application in response to a request from each television receiver. Furthermore, the application management / distribution execution unit 4104 may perform authentication processing of each television receiver as necessary when distributing the applications to each television receiver.

[0170] The LAN communication unit 421 is connected to the Internet 200, and communicates with the broadcast station server 300 on the Internet 200 and the broadcast receiving device 100 via the router device 200r. The LAN communication unit 421 includes an encoding circuit, a decoding circuit, and the like.

[0171] [Mobile information terminal hardware configuration] 10A is a block diagram showing an example of the internal configuration of a mobile information terminal 700. The mobile information terminal 700 is composed of a main control unit 701, a system bus 702, a ROM 703, a RAM 704, a storage unit 710, a communication processing unit 720, an expansion interface unit 724, an operation unit 730, an image processing unit 740, an audio processing unit 750, and a sensor unit 760.

[0172] The main control unit 701 is a microprocessor unit that controls the entire portable information terminal 700 in accordance with a predetermined operation program. The system bus 702 is a data communication path for transmitting and receiving data between the main control unit 701 and each operation block in the portable information terminal 700.

[0173] ROM 703 is a memory in which basic operation programs such as an operating system and other operation programs are stored, and a rewritable ROM such as an EEPROM or flash ROM is used. RAM 704 serves as a work area when the basic operation programs and other operation programs are executed. ROM 703 and RAM 704 may be integrated with main control unit 701. ROM 703 may use a part of the storage area in storage unit 710 instead of being an independent configuration as shown in FIG. 10A.

[0174] The storage unit 710 stores the operation program and operation setting values ​​of the mobile information terminal 700, personal information of the user of the mobile information terminal 700, etc. It can also store operation programs downloaded via the Internet 200 and various data created by the operation programs. It can also store content such as video, still images, and audio downloaded via the Internet 200. A part of the area of ​​the storage unit 710 may replace all or part of the functions of the ROM 703. The storage unit 710 needs to hold the stored information even when power is not being supplied from the outside to the mobile information terminal 700. Therefore, for example, devices such as a nonvolatile semiconductor element memory such as a flash ROM or SSD, a magnetic disk drive such as an HDD, etc. are used.

[0175] It should be noted that the operation programs stored in the ROM 703 and the storage unit 710 can be added, updated, and have their functions expanded by downloading from each server device on the Internet 200 .

[0176] The communication processing unit 720 is composed of a LAN communication unit 721, a mobile telephone network communication unit 722, and an NFC communication unit 723. The LAN communication unit 721 is connected to the Internet 200 via the router device 200r and the access point 200a, and transmits and receives data to and from each server device and other communication devices on the Internet 200. The connection to the router device 200r and the access point 200a is assumed to be made by a wireless connection such as Wi-Fi (registered trademark). The mobile telephone network communication unit 722 performs telephone communication (calls) and transmits and receives data by wireless communication with the base station 600b of the mobile telephone communication network. The NFC communication unit 723 performs wireless communication when in close proximity to a corresponding reader / writer. The LAN communication unit 721, the mobile telephone network communication unit 722, and the NFC communication unit 723 each include an encoding circuit, a decoding circuit, an antenna, and the like. The communication processing unit 720 may further include other communication units such as a BlueTooth (registered trademark) communication unit and an infrared communication unit.

[0177] The expansion interface unit 724 is a group of interfaces for expanding the functions of the portable information terminal 700, and in this embodiment, is composed of a video / audio interface, a USB interface, a memory interface, etc. The video / audio interface inputs video signals / audio signals from an external video / audio output device, outputs video signals / audio signals to an external video / audio input device, etc. The USB interface connects to a PC or the like to send and receive data. It may also be used to connect a keyboard or other USB device. The memory interface connects to a memory card or other memory medium to send and receive data.

[0178] The operation unit 730 is an instruction input unit that inputs operation instructions to the mobile information terminal 700, and in this embodiment, is configured with a touch panel 730t arranged on top of the display unit 741 and operation keys 730k arranged with button switches. Only one of them may be used. The mobile information terminal 700 may be operated using a keyboard or the like connected to the extended interface unit 724. The mobile information terminal 700 may be operated using a separate terminal device connected by wired or wireless communication. In other words, the mobile information terminal 700 may be operated from the broadcast receiving device 100. The touch panel function may be provided in the display unit 741.

[0179] The image processing unit 740 is composed of a display unit 741, an image signal processing unit 742, a first image input unit 743, and a second image input unit 744. The display unit 741 is a display device such as a liquid crystal panel, and provides image data processed by the image signal processing unit 742 to the user of the mobile information terminal 700. The image signal processing unit 742 includes a video RAM (not shown), and the display unit 741 is driven based on image data input to the video RAM. The image signal processing unit 742 also has a function of performing format conversion, superimposition processing of menus and other OSD (On Screen Display) signals, etc., as necessary. The first image input unit 743 and the second image input unit 744 are camera units that input image data of the surroundings and objects by converting light input from a lens into an electrical signal using an electronic device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor.

[0180] The audio processing unit 750 is composed of an audio output unit 751, an audio signal processing unit 752, and an audio input unit 753. The audio output unit 751 is a speaker, and provides an audio signal processed by the audio signal processing unit 752 to the user of the mobile information terminal 700. The audio input unit 753 is a microphone, and converts the user's voice, etc. into audio data and inputs it.

[0181] The sensor unit 760 is a group of sensors for detecting the state of the portable information terminal 700, and in this embodiment, is composed of a GPS receiver unit 761, a gyro sensor 762, a geomagnetic sensor 763, an acceleration sensor 764, an illuminance sensor 765, and a proximity sensor 766. These sensors make it possible to detect the position, inclination, direction, and movement of the portable information terminal 700, as well as the brightness of the surroundings, the proximity of surrounding objects, and the like. The portable information terminal 700 may further include other sensors, such as an air pressure sensor.

[0182] The portable information terminal 700 may be a mobile phone, a smartphone, a tablet terminal, etc. It may also be a PDA (Personal Digital Assistant) or a notebook PC. It may also be a digital still camera, a video camera capable of shooting moving images, a portable game machine, a navigation device, or other portable digital devices.

[0183] 10A includes many components that are not essential to this embodiment, such as the sensor unit 760, but the effects of this embodiment are not impaired even if these components are not included. Also, components not shown, such as a digital broadcast receiving function and an electronic money payment function, may be added.

[0184] [Mobile information terminal software configuration] 10B is a software configuration diagram of the mobile information terminal 700 of this embodiment, and shows the software configuration in the ROM 703, the RAM 704, and the storage unit 710. In this embodiment, a basic operation program 7001 and other operation programs are stored in the ROM 703, and a cooperative control program 7002 and other operation programs are stored in the storage unit 710. The storage unit 710 is also assumed to include a content storage area 7200 for storing content such as moving images, still images, and audio, an authentication information storage area 7300 for storing authentication information and the like required for accessing a television receiver or each server device, and various information storage areas for storing various other information.

[0185] A basic operation program 7001 stored in ROM 703 is loaded onto RAM 704, and the main control unit 701 executes the loaded basic operation program to constitute a basic operation execution unit 7101. Similarly, a cooperative control program 7002 stored in the storage unit 710 is loaded onto RAM 704, and the main control unit 701 executes the loaded cooperative control program to constitute a cooperative control execution unit 7102. The RAM 704 also includes a temporary storage area for temporarily holding data created during execution of each operation program as necessary.

[0186] In the following, for ease of explanation, the process of the main control unit 701 loading the basic operation program 7001 stored in the ROM 703 into the RAM 704 and executing it to control each operation block will be described as being performed by the basic operation execution unit 7101 to control each operation block. Similar descriptions will be used for the other operation programs.

[0187] The cooperative control execution unit 7102 manages device authentication and connection, transmission and reception of each data, etc., when the mobile information terminal 700 performs cooperative operation with the television receiver. The cooperative control execution unit 7102 also includes a browser engine function for executing an application that cooperates with the television receiver.

[0188] The operation programs may be stored in the ROM 703 and / or the storage unit 710 beforehand at the time of product shipment. After product shipment, the operation programs may be acquired from other application servers 500 on the Internet 200 via the LAN communication unit 721 or the mobile telephone network communication unit 722. Moreover, the operation programs may be acquired via the extended interface unit 724 from memory cards, optical disks, or the like.

[0189] [Time management for broadcast receiving devices] The broadcast receiving device of this embodiment has two types of time management functions. The first time management function is a time management function based on NTP, as already explained with reference to Fig. 7C. The second time management function is a time management function based on MH-TOT, and the time is managed based on the time information transmitted by MH-TOT, as explained with reference to Fig. 6B.

[0190] An example of the configuration of time information transmitted by NTP is shown in FIG. 13A. An example of the data structure of the MPU timestamp descriptor is shown in FIG. 13B. The "reference_timestamp" parameter and the "transmit_timestamp" parameter in the NTP format are 64-bit time data in the NTP long format, and the "mpu_presentation_time" parameter in the MPU timestamp descriptor is also 64-bit time data in the NTP timestamp format. The NTP long format time data and the NTP timestamp format time data are data in which "seconds or more" of UTC are expressed in 32 bits and "less than seconds" is expressed in 32 bits. That is, the NTP format time information can transmit time information up to "less than seconds". Furthermore, since the NTP format time information is expressed in UTC notation, it can be consistent with the NTP included in the signal received on the communication line path (for example, the communication line that can be received by the LAN communication unit 121 in FIG. 7A) as shown in FIG. 3(B), unlike the clock management in conventional digital broadcasting.

[0191] In contrast, the information transmitted by the MH-TOT is as follows. The broadcast receiving device 100 is assumed to be able to obtain the current date and Japan Standard Time from the MH-TOT. FIG. 11A shows an example of the data structure of the MH-TOT. The broadcast receiving device 100 is assumed to be able to obtain the current date and the current time from the "JST_time" parameter of the MH-TOT. As shown in FIG. 11B, the "JST_time" parameter is assumed to include the lower 16 bits of the coded data of the current date based on the Modified Julian Date (MJD) and 24 bits of information expressing Japan Standard Time (JST) as six 4-bit binary-coded decimal (BCD) numbers. The current date can be calculated by performing a predetermined calculation on the 16-bit coded data of the MJD. The six 4-bit binary coded decimal numbers consist of two 4-bit binary coded decimal numbers that represent the hour in two decimal digits, the next two 4-bit binary coded decimal numbers that represent the minutes in two decimal digits, and the last two 4-bit binary coded decimal numbers that represent the seconds in two decimal digits.

[0192] Therefore, the difference between time based on NTP and time based on MH-TOT is that NTP, as mentioned above, transmits time information in UTC notation that can transmit time information down to the "second", while the information transmitted by MH-TOT is information down to the "second" in JST notation.

[0193] The broadcast receiving device 100 of this embodiment can achieve more accurate synchronization by using a time management function based on NTP, which is time information in UTC, for decoding and displaying synchronization processing of video, audio, subtitles, superimposed text, and other presented data, which are the contents of the broadcast signal. Furthermore, by referring to information in UTC notation instead of the clock notation of the broadcast station, it is also possible to perform synchronization processing of decoding and displaying video, audio, subtitles, superimposed text, or other data, which are the contents of the broadcast signal received by the broadcast signal, and video, audio, subtitles, superimposed text, or other data acquired through a communication line path.

[0194] Furthermore, the broadcast receiving device of this embodiment may use the time management function based on "JST_time" including 24-bit information expressed by six 4-bit binary-coded decimal numbers of MH-TOT in the process of presenting the current time to the user or each process that handles the MH-Event Information Table (MH-EIT) described in FIG. 6B. Generally, the process of presenting the current time to the user in the broadcast receiving device rarely requires accuracy to the nearest second. Also, each piece of time information described in the MH-Event Information Table (MH-EIT) is stored in two decimal digits each for "hour", "minute", and "second" as 24-bit information expressed by six 4-bit binary-coded decimal numbers, similar to the EIT of conventional digital broadcasting transmitted by the MPEG2-TS method. For this reason, the time management function based on MH-TOT in the broadcast receiving device 100 of this embodiment is easily compatible with the process that uses the MH-EIT. Specifically, the process that uses the MH-EIT is a program guide generation process (described later), control of recording and viewing reservations, copyright management process such as temporary storage, etc. This is because it is rare for any process to require accuracy below a second, and accuracy on the order of one second is sufficient.

[0195] Moreover, the program guide generation process, the control of recording and viewing reservations, and copyright management processes such as temporary storage are also functions installed in receivers of digital broadcasting systems using the conventional MPEG2-TS format. Then, in the broadcasting system of this embodiment, if the program guide generation process, the control of recording and viewing reservations, and copyright management processes such as temporary storage are configured to be compatible with time management processes consistent with conventional MPEG2-TS format digital broadcasting systems, when configuring a broadcast receiving device having both a function for receiving digital broadcasts using the conventional MPEG2-TS format and a function for receiving digital broadcasts using the MMT format, it will be unnecessary to design separate processing algorithms for these processes (program guide generation process, control of recording and viewing reservations, copyright management processes such as temporary storage, and other processes), and costs can be reduced.

[0196] Furthermore, even if a receiver does not have the ability to receive digital broadcasts using the conventional MPEG2-TS format, and only has the ability to receive digital broadcasts using the MMT format, it is not necessary to create completely new algorithms for processes such as generating a program guide, controlling recording and viewing reservations, and copyright management processes such as temporary storage. Instead, the algorithms for functions that are also installed in receivers for digital broadcasting systems using the conventional MPEG2-TS format can be reused, making it possible to develop them at lower cost.

[0197] Therefore, by configuring the time management function based on the MH-TOT "JST_time" parameter for these processes (such as program guide generation, control of recording and viewing reservations, and copyright management such as temporary storage), it will be possible to provide even MMT-type digital broadcast receiving devices at a lower cost by improving compatibility with conventional broadcasting systems.

[0198] As described above, the broadcast receiving device 100 of this embodiment has a time management function that uses two types of time information with different accuracy. One type of time information is time information written in a manner consistent with conventional digital broadcasting systems, and the other type of time information is time information with a higher resolution than the one type of time information. By using the latter type of time information for synchronization processing of each content data of a broadcast signal, a more advanced information presentation processing than that of conventional broadcasting systems is realized, and by using the former type of time information for program guide generation processing, recording reservation control and viewing reservation control, copyright management processing such as temporary storage, etc., a broadcast receiving device can be provided at a low cost.

[0199] Therefore, by providing the two types of time management functions described above, the broadcast receiving device 100 of this embodiment can achieve both more advanced information presentation processing and lower costs.

[0200] [First variation of time management] Next, a first modified example of time management in the broadcasting system of this embodiment will be described below.

[0201] In a first variant, in order to improve the accuracy of the management time of the NTP-based time management function already described with reference to Figure 7C, information regarding an estimated delay time in transmitting time information from a time management server (not shown) or broadcast station server 300 to broadcast receiving device 100 may be included in the broadcast signal and transmitted, and the broadcast receiving device 100 may be configured to use the information regarding the estimated delay time to correct the system clock of the NTP-based time management function.

[0202] In this case, the information on the expected delay time may be configured to be transmitted not in the TLV multiplexed stream shown in FIG. 3A but in a TMCC (Transmission and Multiplexing Configuration Control) area outside the TLV multiplexed stream. If the information is transmitted in the TMCC area, the broadcast receiving device 100 can extract the information on the expected delay time without undergoing a separation process (demux process) of the TLV multiplexed stream. That is, it is possible to obtain information that is not easily affected by the delay caused by the separation process in the broadcast receiving device 100, and therefore it is possible to perform a highly accurate system clock correction process. An example of the data structure of the time information transmitted by the TMCC signal will be described with reference to FIG. 13C. The time information may be stored and transmitted, for example, in a TMCC extended information area. In the time information in the TMCC extended information area in FIG. 13C, the "delta" parameter represents the expected value of the transmission delay from a time management server that distributes UTC or a server device that creates a TMCC signal to a general broadcast receiving device, using a 32-bit signed fixed point. The upper 16 bits describe the integer part, and the lower 16 bits describe the decimal part. The "transmit_timestamp" parameter is a transmission timestamp, and describes the time when this TMCC signal is sent from the server device in NTP timestamp length format. The upper 32 bits represent the integer part, and the lower 32 bits represent the decimal part.

[0203] In the first variant, the broadcast receiving device 100 of this embodiment can use information regarding the expected delay time described in the time information stored in the TMCC extended information area and transmitted (e.g., the aforementioned ``delta'' parameter and / or ``transmit_timestamp'' parameter) to more accurately correct the system clock of the NTP-based time management function used for synchronization processing of each content data of the broadcast signal.

[0204] [Second modified version of time management] Next, a second modification of the time management in the broadcasting system of this embodiment will be described below.

[0205] As described above, the broadcast receiving device 100 of this embodiment has a time management function that acquires the current date and Japan Standard Time from information transmitted in the MH-TOT and manages the time. The current date and Japan Standard Time acquired from information transmitted in the MH-TOT can be superimposed on video information, application information, etc. by the video synthesis unit 161 of the broadcast receiving device 100, and output to the monitor unit 162 or video output unit 163 for provision to the user. As described above, the MH-TOT has the data structure shown in Fig. 11A, and the broadcast receiving device 100 can acquire the current date and current time from the "JST_time" parameter of the MH-TOT.

[0206] However, since the aforementioned "JST_time" parameter uses only the lowest 16 bits of the encoded data of the MJD, an overflow occurs at "April 22, 2038", and dates after "April 23, 2038" cannot be expressed by the above-mentioned specified calculation alone. Therefore, in the second modified example of this embodiment, the calculation method is switched between when the MJD value is equal to or greater than a specified value and when it is less than the specified value, so that dates after "April 23, 2038" can be expressed.

[0207] FIG. 12 shows an example of a first calculation method used when the value of MJD is equal to or greater than a predetermined value, and a second calculation method used when the value of MJD is less than the predetermined value. For example, if the predetermined value is "32768 (0x8000)", the first calculation method is used to calculate the current date when MJD is equal to or greater than "32768", and the second calculation method is used to calculate the current date when MJD is less than "32768". Note that the case where MJD is less than "32768" is equivalent to the case where the most significant bit of the 16-bit data of MJD is "0". This makes it possible to express dates after "April 23, 2038" in the broadcast receiving device 100 of this embodiment. However, the predetermined value can be set arbitrarily, and the predetermined value may be set to "16384 (0x4000)", "49152 (0xC000)", etc. The condition for switching the calculation method may be when the most significant 2 bits of the 16-bit data of the MJD are "00" or when the most significant 2 bits of the 16-bit data of the MJD are not "11." If the above-mentioned means is used with the predetermined value set to "32768," it will not be possible to express dates prior to "September 4, 1948," but this will not be a problem in practical use as a television receiver.

[0208] Also, instead of switching between the first calculation method and the second calculation method depending on the comparison result between the MJD and the predetermined value, the first calculation method and the second calculation method may be switched depending on a flag that replaces part or all of the "reserved" parameter in the data structure of the MH-TOT shown in FIG. 11A or a newly added flag. For example, when the most significant bit of the 16-bit encoded data of the MJD is "0", if the MJD indicates "April 23, 2038" or later, the flag may be set to "1", and if the MJD does not indicate "April 23, 2038" or later, the flag may be set to "0". Then, when the flag is "1", the second calculation method shown in FIG. 12 may be used, and when the flag is "0", the first calculation method may be used. Alternatively, a new descriptor having the same meaning as the flag may be prepared and placed in the MH-TOT.

[0209] In addition, in the broadcasting system of this embodiment, as described above, absolute time in NTP format is transmitted, and the broadcasting receiving device 100 of this embodiment has a time management function based on the NTP. Furthermore, in the broadcasting receiving device 100 of this embodiment, the decoding timing and presentation timing for each presentation unit of the video / audio signal are controlled by referring to the NTP timestamp described in the MPU timestamp descriptor set for each MPU. As described above, the time information in the NTP format has the configuration shown in FIG. 13A. Moreover, the MPU timestamp descriptor has the configuration shown in FIG. 13B.

[0210] For this reason, the broadcast receiving device 100 of this embodiment may refer to the "reference_timestamp" parameter, the "transmit_timestamp" parameter, or the "mpu_presentation_time" parameter, etc., and select whether to use the first calculation method or the second calculation method according to the value of the referenced time data, etc. That is, for example, if the most significant bit of the 64-bit NTP-length format time data is "0", the second calculation method may be used, and if it is not "0", the first calculation method may be used, etc.

[0211] Either of the above methods makes it possible for the broadcast receiving device 100 of this embodiment to express dates after "April 23, 2038."

[0212] [Broadcast receiving device channel selection process (initial scan)] The AMT of the broadcasting system of this embodiment provides a list of multicast groups of IP packets so that IP packets transmitted by the TLV multiplexing method can be received without distinction from IP packets transmitted over a communication line as much as possible. Multiple IP multicast groups can be listed for one service identification. Also, an address mask can be used to efficiently describe consecutive IP addresses.

[0213] In the broadcast receiving device 100 of this embodiment, when scanning channels for initial setting or when rescanning for changing settings, it is possible to store a list of services acquired from the TLV-NIT in a non-volatile memory such as the ROM 103 or the storage unit 110, and further, it is possible to store a list of IP multicast groups corresponding to each of the services as IP related information in the non-volatile memory in association with each of the services. By storing the list of services and the IP related information in a non-volatile memory and making it possible to refer to them at all times, it becomes unnecessary to reacquire the TLV-NIT or AMT when switching channels, etc., and it becomes possible to efficiently acquire broadcast contents.

[0214] FIG. 14 is a diagram showing an example of an operation sequence during channel scanning (rescanning) in the broadcast receiving device 100 of this embodiment.

[0215] When a channel scan is started, the receiving function execution unit 1102 sets an initial frequency value to the tuner / demodulator unit 131 and instructs the tuner / demodulator unit 131 to tune to the frequency value (S101). If the tuner / demodulator unit 131 succeeds in locking onto the set frequency value (S102: Yes), the receiving function execution unit 1102 then acquires a TLV-NIT from the received signal (S103).

[0216] If the TLV-NIT acquired in the process of S103 is valid data (S104: Yes), the receiving function execution unit 1102 acquires information such as a TLV stream ID and an original network ID from the acquired TLV-NIT (S105). FIG. 15A shows an example of the data structure of a TLV-NIT. The TLV stream ID information can be acquired from the "tlv_stream_id" parameter, and the original network ID information can be acquired from the "original_network_id" parameter. Furthermore, distribution system information related to the physical conditions of the broadcast transmission path corresponding to each TLV stream ID / original network ID is acquired from the distribution system descriptor (S106), and a list of service IDs is acquired from the service list descriptor (S107). FIG. 15B shows an example of the data structure of a satellite distribution system descriptor. FIG. 15C shows an example of the data structure of a service list descriptor. If the TLV-NIT has a plurality of different data such as the TLV stream ID, the original network ID, the distribution system information, and the list of service IDs, the processes of S105 to S107 are repeated. Next, the reception function execution unit 1102 creates a service list based on the data such as the TLV stream ID, the original network ID, the distribution system information, and the list of service IDs acquired in the processes of S105 to S107, and stores the created service list in the ROM 103 or the storage unit 110 (updates when rescanning) (S108).

[0217] Next, the receiving function execution unit 1102 acquires an AMT from the received signal (S109), and further acquires a list of IP multicast groups related to each service ID stored in the service list (S110). An example of the data structure of an AMT is shown in FIG. 15D. If the AMT has a list of IP multicast groups related to a plurality of service IDs, the process of S110 is repeated. If there are a plurality of AMTs having lists of IP multicast groups related to different service IDs, the processes of S109 to S110 are repeated. Next, the receiving function execution unit 1102 associates the list of IP multicast groups acquired in the process of S110 with the service ID as IP related information, and stores it in the ROM 103 or the storage unit 110 (updates it when rescanning) (S111).

[0218] In addition, if the tuner / demodulator unit 131 does not succeed in locking onto the set frequency value in the process of S102 (S102: No), and if the TLV-NIT acquired in the process of S103 is not valid data (S104: No), the processes of S105 to S111 are not performed.

[0219] After completing the process of S111, if the frequency value set in the tuner / demodulator 131 is the final frequency value of the channel scan range (S112: Yes), the reception function execution unit 1102 ends the process. On the other hand, if the set frequency value is not the final frequency value of the channel scan range (S112: No), the frequency value set in the tuner / demodulator 131 is increased (S113) and the processes of S102 to S111 are repeated. Note that, if service IDs related to all services constituting the broadcast network can be obtained with one TLV-NIT and further, an AMT having a list of IP multicast groups related to the service IDs can be obtained, the processes of S112 to S113 are not necessary.

[0220] Through the series of processes described above, the broadcast receiving device 100 of this embodiment creates / updates a list of services (service list) that make up the broadcast network when scanning channels for initial setup or when rescanning to change settings, and at the same time creates / updates a list of IP multicast groups (IP-related information) corresponding to each of the services, and further stores the list in non-volatile memory such as ROM 103 or storage unit 110.

[0221] The rescan for the setting change may be performed automatically when a change in the information in the table is detected by referring to the "version_number" parameter of the TLV-NIT or AMT. When a change in the "version_number" parameter of either the TLV-NIT or the AMT is detected, only the information on the table in which the change in the parameter is detected may be automatically updated. However, when the automatic update is performed, it is desirable to notify the user that a rescan has been performed automatically. In addition, the user may be notified that a change has been made in the information in the table, and the user may select whether or not to perform the rescan.

[0222] [Broadcast receiving device channel selection process (channel switching)] FIG. 16 is a diagram showing an example of an operation sequence when selecting a station (switching a channel) in the broadcast receiving device 100 of this embodiment.

[0223] When a user operates a remote control (not shown) to instruct channel switching, the receiving function execution unit 1102 interprets the command transmitted from the remote control and specifies the service ID of the target service (S201). Next, the receiving function execution unit 1102 starts acquiring the AMT from the signal received by the tuner / demodulator unit 131. If the AMT is successfully acquired within a predetermined time (S202: Yes), the receiving function execution unit 1102 acquires information on a list of IP multicast groups corresponding to the service ID from the acquired AMT (S204). On the other hand, if the AMT is not successfully acquired within the predetermined time (S202: No), the receiving function execution unit 1102 acquires information on a list of IP multicast groups corresponding to the service ID (S204) by referring to IP-related information stored in the ROM 103 or the storage unit 110 (S203). It is also possible to always refer to the IP-related information stored in the ROM 103 or the storage unit 110 without performing the judgment process of S202.

[0224] Next, the reception function execution unit 1102 starts acquiring the TLV-NIT from the signal received by the tuner / demodulator unit 131. If the TLV-NIT is successfully acquired within a predetermined time (S205: Yes), distribution system information for acquiring the IP data flow corresponding to the service ID is acquired from the acquired TLV-NIT (S207). On the other hand, if the TLV-NIT is not successfully acquired within the predetermined time (S205: No), the distribution system information for acquiring the IP data flow corresponding to the service ID is acquired (S207) by referring to a service list stored in the ROM 103 or the storage unit 110 (S206). Note that the determination process of S205 may not be performed, and the service list stored in the ROM 103 or the storage unit 110 may always be referred to. After acquiring the distribution system information in the processing of S207, the receiving function execution unit 1102 then controls the tuner / demodulation unit 131 with the frequency value indicated in the acquired distribution system information, receives the IP data flow corresponding to the service ID (S208), extracts the MMT data string from the received IP data flow, and outputs it to the separation unit 132.

[0225] In the separation unit 132, the transport processing unit 1102a acquires an MMTP packet with a packet ID of "0" from the input MMT data string (S209), and further acquires an MPT included in the acquired MMTP packet (S210). Next, the transport processing unit 1102a refers to the "MMT_package_id_byte" parameter of the acquired MPT, and checks whether the lowest 16 bits of the "MMT_package_id_byte" parameter have the same value as the service ID. In the example of the data structure of the MPT shown in Fig. 17, if the lowest 16 bits of the "MMT_package_id_byte" parameter have the same value as the service ID (S211: Yes), it is determined that the MMTP packet with the packet ID of "0" is an MMTP packet having data of a program corresponding to the service ID, and executes acquisition of an MFU based on information in the acquired MPT (S216).

[0226] On the other hand, if the lowest 16 bits of the "MMT_package_id_byte" parameter are not the same value as the service ID (S211: No), it is determined that the MMTP packet with the packet ID of "0" is not an MMTP packet having data of a program corresponding to the service ID. In this case, the transport processing unit 1102a acquires a PLT again (S212), and confirms the acquired PLT to confirm the packet ID (assumed to be x) of the MMTP packet transmitting an MPT having the "MMT_package_id_byte" parameter corresponding to the service ID (S213). Furthermore, the transport processing unit 1102a acquires an MMTP packet with a packet ID of "x" from the input MMT data string (S214), and acquires an MPT included in the acquired MMTP packet (S215). Furthermore, it acquires an MFU based on information contained in the acquired MPT (S216).

[0227] It is also possible to always perform the processes of S212 to S215 without performing the processes of S209 to S211. In this case, when the data of the program corresponding to the service ID is stored in an MMTP packet with a packet ID other than "0", it is possible to shorten the processing time.

[0228] When the MFU is acquired in the process of S216, the transport processing unit 1102a extracts encoded video data, encoded audio data, etc. from the acquired MFU and outputs them to the video decoder 141, the audio decoder 143, etc. Hereinafter, video / audio decoding processing based on the control of the AV decoding processing unit 1102b and presentation processing based on the control of the presentation processing unit 1102h are performed, but since each of the above processes is well known, detailed explanations will be omitted.

[0229] By the above series of processes, the broadcast receiving device 100 of this embodiment can execute a channel selection (channel switching) operation. In particular, as described with reference to Figs. 14 and 16, when a channel scan is performed during initial setting or when a rescan is performed for changing settings, a service list and IP-related information are created and stored in a non-volatile memory such as the ROM 103 or the storage unit 110 so that they can be referenced at all times, and when a channel is selected (channel switching), the service list and IP-related information stored in the non-volatile memory such as the ROM 103 or the storage unit 110 are referenced, thereby improving the efficiency of the operation during channel selection (channel switching). That is, compared to the case where AMT or TLV-NIT is reacquired during channel selection (channel switching), it is possible to shorten the time from the start of channel selection (channel switching) to the end of channel selection (channel switching).

[0230] [Screen layout control for broadcast receiving devices] It is assumed that the broadcast receiving device 100 of this embodiment is capable of controlling the screen layout based on the description of the LCT. An example of the data structure of the LCT is shown in FIG.

[0231] In the diagram, the "left_top_pos_x" and "right_down_pos_x" parameters indicate the horizontal position of the top left and bottom right of the region, respectively, as a percentage of the total number of pixels in the horizontal direction, when the left side of the full screen display is "0" and the right side is "100". The "left_top_pos_y" and "right_down_pos_y" parameters indicate the vertical position of the top left and bottom right of the region, respectively, as a percentage of the total number of pixels in the vertical direction, when the top side of the full screen display is "0" and the bottom side is "100". The "layer_order" parameter indicates the relative position in the depth direction of the region.

[0232] An example of the allocation of layouts to layout numbers based on the settings of each of the parameters is shown in FIGS. 19A to 19D, along with the setting values ​​of each of the parameters.

[0233] FIG. 19A shows a default layout setting of the broadcast receiving device 100 of this embodiment, and is an example in which only one area is set in the entire screen. FIG. 19B shows an example in which the entire screen is divided into three areas, each of which is designated as "area 0", "area 1" and "area 2". For example, if the number of pixels in the entire screen is 7680 pixels horizontally and 4320 pixels vertically, "area 0" is set in the range of (0,0)-(6143,3455) since the "left_top_pos_x" parameter is "0", the "left_top_pos_y" parameter is "0", the "right_down_pos_x" parameter is "80", and the "right_down_pos_y" parameter is "80". Similarly, "area 1" is set in the range of (6144,0)-(7679,4319), and "area 2" is set in the range of (0,3456)-(6143,4319).

[0234] Fig. 19C is an example of setting three regions like Fig. 19B, but "region 0" is set in the range of (0,0)-(7679,4319), and "region 1" and "region 2" are placed in front of "region 0" according to the setting of the "layer_order" parameter, in the same range as above. Fig. 19D is an example of the case where "region 0" is set in device 0 (default device: broadcast receiving device 100 in this embodiment), and "region 1" is set in device 1 (mobile information terminal 700 in this embodiment).

[0235] As described above, in the broadcasting system of this embodiment, by using the LCT, it becomes possible to perform screen layout control for displaying multimedia services on a receiver as intended by the service provider.

[0236] The fractional part after the decimal point that occurs when dividing the screen according to the set values ​​of the parameters such as "left_top_pos_x" may be rounded up or down. Rounding (or rounding down to the nearest whole number in binary) may also be used. For example, if the number of pixels on the entire screen is 7680 pixels / 4320 pixels vertically, and the "left_top_pos_x" parameter of "area 0" is "0", the "left_top_pos_y" parameter is "0", the "right_down_pos_x" parameter is "51", and the "right_down_pos_y" parameter is "51", "area 0" may be set in the range of (0,0)-(3916,2203) by rounding up, or in the range of (0,0)-(3915,2202) by rounding down. Also, taking into account the macroblocks used in the video compression process, rounding up / down may be performed in units of 8 pixels or 16 pixels. This process makes it possible to efficiently set an area based on the LCT and to efficiently convert the resolution of multimedia content in the area.

[0237] [Exception handling for screen layout control on broadcast receiving device] In the broadcast receiving device 100 of this embodiment, even if the area control of the screen layout is performed by the above-mentioned LCT, when the user instructs to display an EPG screen, etc., it is possible to perform screen layout control ignoring the contents of the LCT as an exception process. Figure 20A shows an example of the operation of exception process of the screen layout control based on the LCT.

[0238] 19B is performed according to the description of the LCT, and when a broadcast program image is displayed in "Area 0", and broadcast contents such as program linkage data linked to the broadcast program are displayed in "Area 1" and "Area 2", and the user instructs the display of the EPG screen using a remote control (not shown), the broadcast receiving device 100 of this embodiment returns the screen layout setting to the default setting (i.e., a state in which the same screen layout control as in FIG. 19A is performed) regardless of the description contents of the LCT, as shown in FIG. 20A(A), and controls the EPG screen to be displayed on the entire screen. Furthermore, when the user instructs the display of the EPG screen to end, the screen layout control according to the description contents of the LCT is re-executed.

[0239] By performing the above-mentioned control, the EPG screen can be displayed larger and easier to view than when the EPG screen is displayed while maintaining area control of the screen layout as shown in Figure 20A (B).

[0240] It should be noted that the above-mentioned exception processing of the screen layout control is not only applied when displaying the EPG screen, but may also be applied when displaying a sub-screen or a dual-screen display of various setting screens of the broadcast receiving device 100 (the recording setting screen in the illustrated example), as shown in FIG. 20B.

[0241] In the case of the recording setting screen shown in FIG. 1A, the display area of ​​the broadcast content is changed from the entire screen to only the sub-screen portion at the bottom right of the screen. Similarly, in the case of the dual-screen display shown in FIG. 1B, the display area of ​​the broadcast content is changed from the entire screen to only the split screen portion at the left middle section of the screen. In either case, the display area for displaying the broadcast content is narrower than when the entire screen is used, so it is not visually preferable to maintain the area control of the screen layout within the display area (i.e., to display multiple broadcast contents simultaneously by dividing the area). Therefore, in the broadcast receiving device 100 of this embodiment, in the above-mentioned situation, only the broadcast content in "Area 0" is selected and displayed in the display area. Note that the broadcast content in "Area 1" or "Area 2" may be selected and displayed depending on the immediately preceding area selection situation.

[0242] By performing the above-mentioned control, it is possible to improve the ease of viewing of the broadcast contents compared to when various broadcast contents are displayed while maintaining the area control of the screen layout. The same is true when displaying a sub-screen in the recorded program list screen, when displaying Internet contents in a browser, etc.

[0243] [EPG display on broadcast receiving device] In the broadcasting system of this embodiment, time-series information on events (so-called programs) included in each service constituting the broadcasting network is transmitted by MH-EIT. FIG. 21 shows an example of the data structure of the MH-EIT of this embodiment. The MH-EIT is identified into two classes by a table ID (corresponding to the "table_id" parameter in the figure), and is capable of indicating information on the current / next event of its own TLV stream and schedule information of each event of its own TLV stream. The broadcast receiving device 100 of this embodiment is capable of acquiring information such as the start time and broadcast time of each event by identifying the event by a service ID (corresponding to the "service_id" parameter in the figure) with reference to the MH-EIT, etc., and creating an EPG screen, and is capable of superimposing the created EPG on video information, etc. in the video synthesis unit 161 and displaying it on the monitor unit 162.

[0244] 22A is a diagram showing an example of an EPG screen in the broadcast receiving device 100 of this embodiment. The EPG screen 162a is in a matrix shape with the vertical axis indicating time and the horizontal axis indicating service ID (channel), and displays detailed information of broadcast programs broadcast on each channel in each time period. In addition, the detailed information 162a1 of each broadcast program is mainly composed of a title area 162a2 and a detailed description area 162a3.

[0245] The title area 162a2 displays the program title of the broadcast program and symbols and the like representing the attributes of the broadcast program. The symbols and the like representing the attributes of the broadcast program are, for example, symbols / characters indicating that it is a new program, symbols / characters indicating that it is a rebroadcast program, etc. Alternatively, it may be a symbolized mark of "data" indicating that it supports data broadcasting by a broadcasting service. It may also be a symbolized mark 162a4 of "NetWork" indicating that content, applications, etc. related to the broadcast program can be obtained from a network. Furthermore, the symbols and the like representing the attributes of the broadcast program may be substituted by differentiating the background color of the detailed information 162a1 from others, or by surrounding the display area of ​​the detailed information 162a1 with a thick frame.

[0246] Even if the control information (messages, tables, descriptors, etc.) in the broadcasting system of this embodiment indicates that content, applications, etc. related to the broadcast program can be obtained from the network, if a LAN cable is not connected to the LAN communication unit 121 of the broadcast receiving device 100, or if access to each server device on the network is not possible, the symbol 162a4 of "NetWork" etc. may be controlled not to be displayed.

[0247] In addition, when the broadcast program is a distribution program distributed via the Internet 200 and cannot be acquired only from the broadcast wave, and further, as described above, when the broadcast receiving device 100 is in a state where it cannot access each server device on the network, the detailed information 162b1 displayed on the EPG screen 162b may be controlled to be grayed out as shown in FIG. 22B. That is, the detailed information of the distribution program that cannot be viewed is controlled not to be displayed. In addition, the background color of the detailed information 162b1 may be differentiated from the others as an alternative to the graying out process. When the detailed information 162b1 is selected by operating a remote control not shown, the user may be notified by a pop-up or the like that the broadcast receiving device 100 is in a state where it cannot access each server device on the network, or that the distribution program associated with the detailed information 162b1 cannot be viewed.

[0248] Through the above-mentioned controls, the broadcast receiving device 100 can provide the user with program information for each broadcast program in a format that feels natural to the user, depending on the network connection status.

[0249] 22C is a diagram showing another example of an EPG screen in the broadcast receiving device 100 of this embodiment. In the diagram, "M1 TV", "M2 Broadcast", "M3 Channel", "M4TV", "TV M5", etc. are the broadcast station names of the respective channels, and in particular, the "M2 Broadcast" station simultaneously provides a broadcast program distributed by airwaves and a distributed program distributed via the Internet 200 (information 162c1 of the slot indicated by "Internet Broadcast" in the diagram).

[0250] As shown in the figure, when there is a channel that only has programs distributed via the Internet 200, control is normally performed to display information for all channels (including information 162c1) as shown in EPG screen 162c in figure (A). On the other hand, when the broadcast receiving device 100 is in a state where it cannot access each server device on the network, control may be performed not to display information for the "M2 broadcast (Internet broadcast)" channel that only has programs distributed via the Internet 200 (information 162c1 in figure (A)), as shown in EPG screen 162d in figure (B).

[0251] By the above-mentioned controls, the user of the broadcast receiving device 100 can eliminate the need to check information about channels that he or she cannot view.

[0252] [Emergency warning broadcast display on broadcast receiving device] The broadcast receiving device 100 of this embodiment is capable of performing receiving processing of an emergency alert broadcast when the emergency alert broadcast start control signal bit of the TMCC signal contained in the transmission data including the TLV stream changes from "0" to "1."

[0253] The emergency alert broadcast may be provided as a full-screen application or as text information with superimposed text. When the emergency alert broadcast is provided as text information with superimposed text, it is preferable to display the text information of the superimposed text regardless of the state of the broadcast receiving device 100 immediately before receiving the emergency alert broadcast. That is, as shown in FIG. 23, when a user watches a normal broadcast program and receives an emergency alert broadcast while a program screen 162e of the broadcast program is displayed on the monitor unit 162, the text information 162e1 of the emergency alert broadcast is superimposed on the program screen 162e. Similarly, when a user instructs to display an EPG screen and receives an emergency alert broadcast while an EPG screen 162f is displayed on the monitor unit 162, the text information 162f1 of the emergency alert broadcast is superimposed on the EPG screen 162f.

[0254] By the above-mentioned control, in the broadcast receiving device 100 of this embodiment, when an emergency alert broadcast is received, it is possible to avoid missing important text information based on the emergency alert broadcast, even if the user selects and displays an EPG screen, various setting screens, a recorded program list screen, an Internet browser, etc. This control may also be performed on text information of normal superimposed text that is not based on an emergency alert broadcast.

[0255] [Various exception handling] When the broadcast receiving device 100 of this embodiment cannot acquire data outside the TLV stream in the same package, it may perform, for example, exceptional processing such as that described below.

[0256] As described in FIG. 6E, in the broadcast system supported by the broadcast receiving device 100 of this embodiment, the data acquired in the TLV stream and the data acquired through a path other than the TLV stream can be included in the same package based on the location information stored in the MPT (corresponding to "MMT_general_location_info()" in FIG. 17). However, the data transmission path other than the TLV stream indicated by the location information (for example, IPv4 data flow, IPv6 data flow, broadcast MPEG2-TS, etc.) is a receiving function different from the receiving function of the TLV / MMT stream. Therefore, even when the broadcast receiving device 100 is operating, there may be a situation in which data cannot be acquired from these transmission paths, such as a situation in which the receiving function of these transmission paths is not operating, a situation in which the receiving function itself is operating but a relay device or the like is not operating, a situation in which these transmission paths are not connected by wire or wirelessly, or a situation in which the broadcast receiving device 100 is installed in an environment in which these transmission paths cannot be connected in the first place.

[0257] Under such circumstances, when an event is received in which the location information stored in the MPT indicates that data acquired within the TLV stream and data acquired via a route other than the TLV stream should be associated so as to be included in the same package, the broadcast receiving device 100 of this embodiment may perform, for example, the following operations.

[0258] For example, in the case where the LCT sets multiple regions in the screen as shown in Figures 19B and 19C, and the video included in the TLV stream is displayed in "region 0" and the data acquired in a transmission path other than the TLV stream is displayed in "region 1" and "region 2", and the data of a transmission path other than the TLV stream to be displayed in "region 1" and "region 2" cannot be acquired, the layout display of the multiple regions specified by the LCT may be prohibited. Specifically, even if the LCT is received, the video of the content received in the TLV stream may be displayed in "region 0" of the default layout display shown in Figure 19A, and the layout display of the multiple regions may not be changed to that of Figures 19B and 19C. Furthermore, even if an instruction to change the default layout to the layout indicated by the LCT is input to the operation input unit 170 in Figure 7A in this state, the default layout display shown in Figure 19A may be left as it is, or the display may be switched to another data broadcasting screen, and the layout display of the multiple regions may not be changed to that of Figures 19B and 19C.

[0259] In the case where the LCT sets multiple regions in the screen as shown in Figures 19B and 19C, and the video included in the TLV stream is displayed in "region 0", and data acquired in a transmission path other than the TLV stream is displayed in "region 1" and "region 2", and data of a transmission path other than the TLV stream to be displayed in "region 1" and "region 2" cannot be acquired, another operation example may be to temporarily display the display frame of the multiple regions shown in Figures 19B and 19C indicated by the LCT, display a background color or a predetermined still image in "region 1" and "region 2", and if data of a transmission path other than the TLV stream indicated by the location information of the MPT cannot be acquired even after a predetermined time has elapsed, perform a display switch to return to the default layout display state shown in Figure 19A. In this case, it is preferable to operate so that the program video included in the TLV stream continues to be displayed in "region 0" even when the layout of Figures 19A, 19B, and 19C is changed, since the user's program video itself will continue.

[0260] In addition, when the video of the content received in the TLV stream is displayed in "Area 0" of the default layout display shown in Fig. 19A due to the inability to obtain data of a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2", the operation of various communication functions and various reception functions of the broadcast receiving device 100 of this embodiment may start, or the communication environment and communication status of the various communication functions and the reception environment and reception status of the various reception functions may change, resulting in a situation in which data of a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2" can be obtained. In this case, the broadcast receiving device 100 of this embodiment may immediately switch from the default layout display shown in Fig. 19A to a layout of multiple areas as shown in Fig. 19B or Fig. 19C shown by the LCT, and may display the video of the content received in the TLV stream in "Area 0", and switch to display data obtained from a transmission path other than the TLV stream in "Area 1" or "Area 2". Alternatively, the layout change may not be performed immediately, but may be performed after an instruction to change the default layout to the layout indicated by the LCT is input from the operation input unit 170.

[0261] [Copyright protection function] In the digital broadcasting system compatible with the broadcast receiving device 100 of this embodiment, by including copy control information in the MPT and transmitting it, the copy control information may be configured to transmit, for example, "unlimited copying permitted" (which may be divided into two types: "unlimited copying permitted and encryption processing required when storing and outputting" and "unlimited copying permitted and encryption processing not required when storing and outputting"), "one generation only permitted", "predetermined number of times of copying permitted" (for example, so-called "dubbing 10" if nine copies permitted and one move permitted), "copy prohibited", etc. of the content referenced by the MPT. In this case, the broadcast receiving device 100 of this embodiment may be configured to control the storage of the content in the storage (storage) unit 110, recording on a removable recording medium, output to an external device, copying to an external device, moving to an external device, etc., according to the copy control information. Note that the target of the storage process may not only be the storage (storage) unit 110 inside the broadcast receiving device 100, but may also include records that have been subjected to protection processing such as encryption processing so that they can be played back only by the broadcast receiving device 100. Specifically, the targets of the storage process include external recording devices and the like that are in a state where recording and playback can be performed only by the broadcast receiving device 100 .

[0262] A specific example of the process based on the copy control information will be described below.

[0263] First, when the copy control information included in the MPT indicates "unlimited copying", the broadcast receiving device 100 of this embodiment may perform the processes of storing in the storage unit 110, recording in a removable recording medium, outputting to an external device, copying to an external device, and moving to an external device without any restrictions. However, when "unlimited copying and encryption processing required at the time of storing and outputting" is separated from "unlimited copying and encryption processing not required at the time of storing and outputting", in the case of "unlimited copying and encryption processing required at the time of storing and outputting", the processes of storing in the storage unit 110, recording in a removable recording medium, outputting to an external device, copying to an external device, and moving to an external device may be performed an unlimited number of times, but encryption processing must be performed in all cases.

[0264] Furthermore, when the copy control information included in the MPT indicates "copyable for one generation only", the broadcast receiving device 100 of this embodiment allows for encryption and storage in the storage (accumulation) unit 110, but when outputting the stored content to an external device for viewing, it is encrypted and output together with copy control information of "copy prohibited". However, so-called move processing to an external device (processing in which content is copied to an external device and the content in the storage (accumulation) unit 110 of the broadcast receiving device 100 is made unplayable by erasing processing or the like) is allowed.

[0265] Furthermore, when the copy control information included in the MPT indicates "copyable a specified number of times," the broadcast receiving device 100 of this embodiment is able to encrypt and store the content in the storage (accumulation) unit 110, but when outputting the stored content to an external device for viewing, it is encrypted and output together with copy control information indicating "copy prohibited." However, a predetermined number of copies and move processes to an external device may be possible. In the case of the so-called "dubbing 10" provision, nine copies and one move process to an external device may be performed.

[0266] Furthermore, when the copy control information included in the MPT indicates "copy prohibited", the broadcast receiving device 100 of this embodiment prohibits copying to the storage (accumulation) unit 110. However, when the broadcast receiving device 100 is configured to have a "temporary storage" mode that allows storage in the storage (accumulation) unit 110 only for a predetermined time or a predetermined time specified by control information included in the broadcast signal (for example, by the MH-Expire descriptor shown in FIG. 6D), the content can be temporarily stored in the storage (accumulation) unit 110 even when the copy control information included in the MPT indicates "copy prohibited". When the content whose copy control information included in the MPT is "copy prohibited" is output for viewing on an external device, it is encrypted and output together with the copy control information of "copy prohibited".

[0267] The output for viewing to the external device described above may be performed via video output unit 163 and audio output unit 166 in Fig. 7A, or via digital I / F unit 125, LAN communication unit 121, etc. The copy or move process to the external device described above may be performed via digital I / F unit 125, LAN communication unit 121, etc. in Fig. 7A.

[0268] According to the above-described process, appropriate content protection can be achieved in accordance with the copy control information associated with the content.

[0269] Furthermore, the copying process to an external device via LAN communication unit 121 of content whose copy control information indicates copy restrictions such as "copyable for one generation only," "copyable a specified number of times," or "copy prohibited" may be permitted only when the IP address of the external device that is the destination of a packet transmitted from broadcast receiving device 100 is in the same subnetwork as the IP address of broadcast receiving device 100, and may be prohibited when the IP address of the external device is outside the same subnetwork as the IP address of broadcast receiving device 100. Content whose copy control information indicates "unlimited copying and encryption required when stored and output" may also be handled in the same manner.

[0270] Similarly, the process of storing content whose copy control information indicates copy restrictions such as "copyable for one generation only," "copyable a specified number of times," or "copyable an unlimited number of times and encryption processing required when storing and outputting" in the storage unit 110 and then moving the content to an external device via the LAN communication unit 121 is only possible if the IP address of the external device that is the destination of the packet transmitted from the broadcast receiving device 100 is within the same subnetwork as the IP address of the broadcast receiving device 100, and may be prohibited if the IP address of the external device is outside the same subnetwork as the IP address of the broadcast receiving device 100.

[0271] In principle, video output and audio output for viewing of the content stored in the storage (accumulation) unit 110 of the broadcast receiving device 100 are possible only when the IP address of the external device, which is the destination of the transmission packet from the broadcast receiving device 100, is in the same subnetwork as the IP address of the broadcast receiving device 100, and are prohibited when the IP address of the external device is outside the same subnetwork as the IP address of the broadcast receiving device 100. However, if the external device is connected within the same subnetwork as the IP address of the broadcast receiving device 100 within a predetermined period of time and is registered (paired) as a device that can be viewed even outside the same subnetwork as the IP address of the broadcast receiving device 100, the external device may be configured to be able to output video and audio for viewing of the content stored in the storage (accumulation) unit 110 of the broadcast receiving device 100 to the external device even if the IP address of the external device is outside the same subnetwork as the IP address of the broadcast receiving device 100. In this case, the video and audio output for viewing is performed by encrypting the content.

[0272] According to the processing described above, different processing is performed depending on whether the external device is located within the same subnetwork as the IP address of the broadcast receiving device 100 or outside the same subnetwork, thereby achieving both user convenience and content protection.

[0273] Next, as explained in FIG. 6E, in the digital broadcasting system compatible with the broadcast receiving device 100 of this embodiment, due to the location information in the MPT ('MMT_general_location_info()' in FIG. 17), data acquired via a different route (IPv4, IPv6, MPEG2-TS, URL, etc.) from the data acquired via the TLV stream of the broadcast route may be included in the same package and the same event as the data acquired via the TLV stream. In this case, content protection when copy control information is included in the MPT will be explained.

[0274] First, when copy control information is included in the MPT, data included in the same package and the same event in the location information may be controlled according to the copy control information included in the TLV stream, even if the data is acquired via a different route (IPv4, IPv6, MPEG2-TS, URL, etc.) from the data acquired via the TLV stream of the broadcast route. As described above, the copy control status of the content specified by the copy control information can be specified as "unlimited copying" (which may be divided into two types: "unlimited copying and encryption processing required at the time of storage and output" and "unlimited copying and no encryption processing required at the time of storage and output"), "one generation only copying", "prescribed number of copies" (for example, 9 copies + 1 move is so-called "dubbing 10"), "no copying", etc.

[0275] Here, if the data position indicated by the location information includes MPEG2-TS data transmitted by other digital broadcast signals, the MPEG2-TS data is also associated with copy control information and broadcast in other digital broadcast signals. Then, the question arises as to which information to follow and how to perform copy control of the MPEG2-TS data (whether to follow the copy control information included in the TLV / MMT stream or the copy control information included in the MPEG2-TS).

[0276] In the digital broadcasting system of this embodiment, in order to solve this problem, the broadcast receiving device 100 may perform any one of the following multiple solutions.

[0277] <Example 1> In a first operation example, when copy control information is included in the MPT and data included in the same package and the same event in the location information includes MPEG2-TS data transmitted in another digital broadcast signal, the copy control state indicated by the copy control information included in the TLV stream is given priority over the copy control state indicated by the copy control information included in the MPEG2-TS.

[0278] For example, if the copy control status indicated by the copy control information included in the TLV stream is "one-generation copy permitted" and the copy control status indicated by the copy control information included in the MPEG2-TS is "predetermined number of times copy permitted," even if the data was acquired via a different route (digital broadcast in MPEG2-TS transmission format) from the data acquired in the TLV stream, copy control may be performed as "one-generation copy permitted" content. For example, if the copy control status indicated by the copy control information included in the TLV stream is "unlimited copy permitted" and the copy control status indicated by the copy control information included in the MPEG2-TS is "predetermined number of times copy permitted," even if the data was acquired via a different route (digital broadcast in MPEG2-TS transmission format) from the data acquired in the TLV stream, copy control may be performed as "unlimited copy permitted" content.

[0279] In the case of this operation, data acquired via a route other than the TLV stream can also be put into a copy state as desired for management in the broadcast system supported by the broadcast receiving device 100 of this embodiment.

[0280] <Example 2> In a second operation example, when copy control information is included in the MPT and data included in the same package and the same event in the location information includes MPEG2-TS data transmitted in another digital broadcast signal, the copy control state indicated by the copy control information included in the TLV stream is compared with the copy control state indicated by the copy control information included in the MPEG2-TS, and when the copy control state indicated by the copy control information included in the MPEG2-TS is stricter than the copy control state indicated by the copy control information included in the TLV stream, the MPEG2-TS data is excluded from the content to be processed when storing in the storage unit 110 or the like, recording on a removable recording medium, or outputting from a digital interface.

[0281] In this operation, for data obtained via a route other than the TLV stream, duplication of copy control states on the broadcast receiving device 100 of this embodiment can be eliminated while respecting the original copy control information set in the broadcasting system that transmits the data.

[0282] Furthermore, if the comparison shows that the copy control status indicated by the copy control information included in the MPEG2-TS is the same as or more lenient than the copy control status indicated by the copy control information included in the TLV stream, then copy control can be performed on the MPEG2-TS data included in the same package and the same event in the location information as content in the copy control status indicated by the copy control information included in the TLV stream.

[0283] In this operation, for data obtained via a route other than the TLV stream, duplication of copy control states on the broadcast receiving device 100 of this embodiment can be eliminated while respecting the original copy control information set in the broadcasting system that transmits the data.

[0284] In the above description, the copyright protection function of the broadcast receiving device 100 of this embodiment has been described as being performed based on the copy control information included in the MPT. However, the table in which the copy control information is arranged is not limited to the MPT. In addition to the MPT, the copy control information may be arranged and transmitted in the MH-Service Description Table (MH-SDT) or MH-Event Information Table (MH-EIT) described in Fig. 6B, or in other tables, and the broadcast receiving device 100 may perform copyright protection processing according to these.

[0285] According to the present embodiment described above, it is possible to provide a broadcast receiver compatible with MMT digital broadcasting. Example 2

[0286] The following describes a second embodiment of the present invention. The configuration, processing, effects, and the like of this embodiment are the same as those of the first embodiment unless otherwise specified. Therefore, the following mainly describes the differences between this embodiment and the first embodiment, and omits as much as possible the description of the common points to avoid duplication. The following description is given assuming that the broadcast receiving device of this embodiment is a television receiver that supports both the MMT and MPEG2-TS media transport methods.

[0287] [Hardware configuration of broadcast receiving device] 24 is a block diagram showing an example of the internal configuration of a broadcast receiving device 800. The broadcast receiving device 800 is composed of a main control unit 801, a system bus 802, a ROM 803, a RAM 804, a storage unit 810, a LAN communication unit 821, an expansion interface unit 824, a digital interface unit 825, a first tuner / demodulation unit 831, a second tuner / demodulation unit 832, an MMT decoding processing unit 841, an MPEG2-TS decoding processing unit 842, a video synthesis unit 861, a monitor unit 862, a video output unit 863, an audio synthesis unit 864, a speaker unit 865, an audio output unit 866, and an operation input unit 870.

[0288] The main control unit 801, system bus 802, ROM 803, RAM 804, storage unit 810, expansion interface unit 824, digital interface unit 825, monitor unit 862, video output unit 863, speaker unit 865, audio output unit 866, operation input unit 870, etc. are assumed to have functions equivalent to those of the main control unit 101, system bus 102, ROM 103, RAM 104, storage (accumulation) unit 110, expansion interface unit 124, digital interface unit 125, monitor unit 162, video output unit 163, speaker unit 165, audio output unit 166, operation input unit 170, etc. in the broadcast receiving device 100 of Example 1, and detailed explanations thereof will be omitted.

[0289] The first tuner / demodulation unit 831 receives the broadcast wave of the broadcast service adopting MMT as the media transport method via an antenna not shown, and tunes (selects) the channel of the service desired by the user based on the control of the main control unit 801. Furthermore, the first tuner / demodulation unit 831 demodulates the received broadcast signal to obtain an MMT data string, and outputs it to the MMT decoding processing unit 841. The second tuner / demodulation unit 832 receives the broadcast wave of the broadcast service adopting MPEG2-TS as the media transport method via an antenna not shown, and tunes (selects) the channel of the service desired by the user based on the control of the main control unit 801. Furthermore, the second tuner / demodulation unit 832 demodulates the received broadcast signal to obtain an MPEG2-TS data string, and outputs it to the MPEG2-TS decoding processing unit 842.

[0290] The MMT decode processing unit 841 inputs the MMT data string output from the first tuner / demodulation unit 831, and performs separation processing and decoding processing of the video data string, audio data string, superimposed text data string, subtitle data string, etc., which are real-time presentation elements, based on the control signal included in the MMT data string. The MMT decode processing unit 841 is assumed to have functions equivalent to the separation unit 132, video decoder 141, video color gamut conversion unit 142, audio decoder 143, superimposed text decoder 144, subtitle decoder 145, subtitle synthesis unit 146, subtitle color gamut conversion unit 147, data decoder 151, cache unit 152, application control unit 153, browser unit 154, application color gamut conversion unit 155, sound source unit 156, etc., in the broadcast receiving device 100 of the first embodiment. The MMT decode processing unit 841 can perform various processes described in the first embodiment. The details of the various processes are as described in the first embodiment, so their description will be omitted.

[0291] The MPEG2-TS decoding processor 842 inputs the MPEG2-TS data string output from the second tuner / demodulator 832, and performs separation and decoding processes on the real-time presentation elements such as a video data string, an audio data string, a superimposed text data string, and a subtitle data string based on a control signal included in the MPEG2-TS data string. The MPEG2-TS decoding processor 842 has the same functions as an IRD (Integrated Receiver Decoder) unit of a conventional television receiver that receives broadcast waves from a broadcast service that employs MPEG2-TS as a media transport method, and detailed description thereof will be omitted.

[0292] The video synthesis unit 861 receives the video information, subtitle information, and application information output from the MMT decoding processing unit 841 and the video information, subtitle information, and application information output from the MPEG2-TS decoding processing unit 842, and performs appropriate selection and / or superimposition processing. The video synthesis unit 861 includes a video RAM (not shown), and the monitor unit 862 and the like are driven based on the video information and the like input to the video RAM. The video synthesis unit 861 also performs scaling processing, superimposition processing of EPG screen information, and the like as necessary, based on the control of the main control unit 801. The audio synthesis unit 164 receives the audio information output from the MMT decoding processing unit 841 and the audio information output from the MPEG2-TS decoding processing unit 842, and performs appropriate selection and / or mixing processing.

[0293] The LAN communication unit 821 is connected to the Internet 200 via the router device 200r, and transmits and receives data to and from each server device and other communication devices on the Internet 200. It also acquires an MMT data sequence (or a part thereof) or an MPEG2-TS data sequence (or a part thereof) of a program transmitted via a communication line, and outputs the data to an MMT decoding processing unit 841 or an MPEG2-TS decoding processing unit 842 as appropriate.

[0294] [Time display on broadcast receiving device] In the broadcast receiving device 800 of this embodiment, the current date and the current time can be displayed on the EPG screen, various setting screens, etc. The information on the current date and the current time is transmitted by MH-TOT or the like in a broadcast service that employs MMT as a media transport method, and is transmitted by TOT (Time Offset Table) or the like provided in SI (Service Information) defined in the MPEG-2 system in a broadcast service that employs MPEG2-TS as a media transport method. The broadcast receiving device 800 can acquire the information on the current date and the current time by referring to the MH-TOT or the TOT.

[0295] In general, when the video synthesis unit 861 mainly selects video information, etc. output from the MMT decoding processing unit 841, the information relating to the current date and current time obtained from the MH-TOT is superimposed on the video information, etc., and when the video synthesis unit 861 mainly selects video information, etc. output from the MPEG2-TS decoding processing unit 842, the information relating to the current date and current time obtained from the TOT is superimposed on the video information, etc.

[0296] However, since there are differences in encoding / decoding processes and transmission paths between a broadcast service that adopts MMT as a media transport method and a broadcast service that adopts MPEG2-TS as a media transport method, there is a possibility that inconsistency may occur, particularly in the current time display, when a broadcast service that adopts MMT as a media transport method is selected and when a broadcast service that adopts MPEG2-TS as a media transport method is selected. For example, as shown in Fig. 25, when the screen display is switched from an EPG screen 162g that displays channel information of a broadcast service that adopts MMT as a media transport method to an EPG screen 162h that displays channel information of a broadcast service that adopts MPEG2-TS as a media transport method, the display of the current time is switched from a current time display 162g1 to a current time display 162h1, which may cause the user to feel visual discomfort due to the inconsistency.

[0297] In the broadcast receiving device 800 of this embodiment, in order to prevent the user from feeling visual discomfort, even when the video synthesis unit 861 mainly selects the video information, etc. output from the MMT decoding processing unit 841, the broadcast receiving device 800 controls so that information related to the current date and current time acquired from the TOT is superimposed on the video information, etc. In other words, the broadcast receiving device 800 controls so that current time information provided by a broadcast service that adopts MPEG2-TS as a media transport method is superimposed on the content of the broadcast service that adopts MMT as a media transport method.

[0298] By performing the above control, the broadcast receiving device 800 of this embodiment always refers to the TOT when displaying the current time and displays the acquired current time information. Therefore, even when switching between a broadcast service that employs MMT as the media transport method and a broadcast service that employs MPEG2-TS as the media transport method, it is possible to prevent the user from feeling visual discomfort due to inconsistency in the display of the current time.

[0299] 26 shows an example of selection control of the current time information reference source according to the reception status of each broadcast service in the broadcast receiving device 800 of this embodiment. In the broadcast receiving device 800 of this embodiment, when reception of a broadcast service that employs MPEG2-TS as the media transport method is possible, the device always refers to the TOT to acquire current time information, and only when reception of a broadcast service that employs MPEG2-TS as the media transport method is impossible and reception of a broadcast service that employs MMT as the media transport method is possible, the device is controlled to acquire current time information by referring to the MH-TOT.

[0300] In addition, the same effect as described above can be obtained by controlling the content of a broadcast service that uses MPEG2-TS as the media transport method to be superimposed with current time information provided by a broadcast service that uses MMT as the media transport method, in the opposite manner to the above-mentioned control.

[0301] As described above, in either case, whether the current time information provided by a broadcast service that adopts MPEG2-TS as the media transport method is controlled to be superimposed on the content of a broadcast service that adopts MMT as the media transport method, or the current time information provided by a broadcast service that adopts MMT as the media transport method is controlled to be superimposed on the content of a broadcast service that adopts MPEG2-TS as the media transport method, the current time information can be corrected by referring to the “delta” parameter of the time information in the TMCC extended information area, as explained in [Time management of broadcast receiving device] in Example 1.

[0302] [EPG display on broadcast receiving device] Event schedule information of a broadcast service that adopts MMT as a media transport method is transmitted by MH-EIT, etc. Meanwhile, event schedule information of a broadcast service that adopts MPEG2-TS as a media transport method is transmitted by EIT (Event Information Table) etc. provided in SI defined in the MPEG-2 system. Therefore, generally, when video information provided by a broadcast service that adopts MMT as a media transport method is displayed, event schedule information (MH-EIT) of the broadcast service that adopts MMT can be acquired, and when video information provided by a broadcast service that adopts MPEG2-TS as a media transport method is displayed, event schedule information (EIT) of the broadcast service that adopts MPEG2-TS can be acquired.

[0303] However, the broadcast receiving device 800 of this embodiment is capable of acquiring both the MH-EIT and the EIT, even when displaying video information, etc. provided by a broadcast service that adopts MMT as the media transport method, or when displaying video information, etc. provided by a broadcast service that adopts MPEG2-TS as the media transport method, thereby improving usability for the user.

[0304] 27A shows an example of an EPG screen in the broadcast receiving device 800 of this embodiment. In the figure, the EPG screen 162i is an EPG screen created based on the MH-EIT of a broadcast service that adopts MMT as a media transport method, and "M1 TV", "M2 Broadcast", "M3 Channel", "M4TV", "TV M5", etc. are the broadcast station names of the broadcast service that adopts MMT as a media transport method. Also, the EPG screen 162j is an EPG screen created based on the EIT of a broadcast service that adopts MPEG2-TS as a media transport method, and "T6 TV", "T7 Broadcast", "T8 Channel", "T9TV", "TV TA", etc. are the broadcast station names of the broadcast service that adopts MPEG2-TS as a media transport method.

[0305] For example, when a user is watching a broadcast program provided by a broadcast service that employs MMT as a media transport method and instructs to display an EPG screen by operating a remote control (not shown), an initial screen of the EPG screen (not shown) is displayed. The initial screen of the EPG screen is an EPG screen created based on the MH-EIT of the broadcast service that employs MMT as a media transport method, and displays detailed information on broadcast programs on each channel from 17:00 (nearby the current time) on October 7, 2014 (today). Next, if the user wishes to check detailed information on broadcast programs on each channel from 20:00 on October 9, 2014, and instructs to update the EPG screen by operating a remote control (not shown), an EPG screen 162i is displayed.

[0306] Furthermore, if the user wishes to check detailed information on a broadcast program provided by a broadcast service that employs MPEG2-TS as a media transport method and instructs to switch the network by operating a remote control (not shown), the EPG screen 162j is displayed. At this time, the broadcast receiving device 800 of this embodiment controls to display detailed information on the broadcast programs of each channel on the same day and in the same time slot (i.e., from 20:00 on October 9, 2014) as the EPG screen 162i that was displayed immediately before, instead of the initial screen of the EPG screen (i.e., detailed information on the broadcast programs of each channel from 17:00 on October 7, 2014) created based on the EIT of the broadcast service that employs MPEG2-TS as a media transport method.

[0307] The above-mentioned control enables the user to continuously check detailed information about broadcast programs on the same day and at the same time on multiple networks using different media transport methods with a simple operation. In other words, the usability of the broadcast receiving device 800 is improved.

[0308] Fig. 27B is a diagram showing an example of an EPG screen in the broadcast receiving device 800 of this embodiment that is different from the above. The EPG screen 162k shows a state where the EPG screen 162i shown in Fig. 27A is scrolled in the channel direction (horizontal direction) by operating a remote control (not shown). That is, in the example shown in Fig. 27B, by scrolling the EPG screen in the channel direction (horizontal direction), channel information created based on the MH-EIT of a broadcast service that employs MMT as a media transport method and channel information created based on the EIT of a broadcast service that employs MPEG2-TS as a media transport method are seamlessly displayed on the same time axis.

[0309] Therefore, even if a user desires to check channel information created based on the EIT of a broadcast service that adopts MPEG2-TS as a media transport method while checking channel information created based on the MH-EIT of a broadcast service that adopts MMT as a media transport method, it is possible to eliminate the need to instruct network switching by operating a remote control (not shown). Furthermore, the user can simultaneously check detailed information about broadcast programs on the same day and at the same time on multiple networks that use different media transport methods. In other words, the usability of the broadcast receiving device 800 is improved. Example 3

[0310] The following describes the third embodiment of the present invention. The configuration and effects of the present embodiment are the same as those of the first and second embodiments unless otherwise specified. Therefore, the following mainly describes the differences between the present embodiment and the first and second embodiments, and omits explanations of common points as much as possible to avoid duplication. In this embodiment, the handling of presentation area information set by the layout setting table (LCT) shown in FIG. 18 will be described.

[0311] [Hardware configuration of broadcast receiving device] The hardware configuration of the broadcast receiving device 100 is the same as that of the first embodiment, and therefore a description thereof will be omitted.

[0312] [Program data structure] FIG. 28 shows the structure of program data. The program data consists of information (asset 30003) to be presented to the broadcast receiving device 100, such as video, audio, and program linkage information, and control information. The program linkage information stores text information, graphic information, image information, or video information to be presented in accordance with the program video. FIG. 28 shows a PA message 30000 that describes the presentation method and acquisition destination information of the asset 30003, which is one of the control information. The acquisition destination of the asset 30003 is described as MMT_general_location_info (FIG. 31) in the MP table (MPT) 30001 (FIG. 17) in the PA message 30000 (FIG. 30). In addition, a layout setting table (LCT) 30100 (FIG. 18) is arranged in the PA message 30000, and the layout of the area in which each asset 30003 should be presented is described. Examples of the layout of the presentation area are shown in FIG. 19A to FIG. 19D.

[0313] A package list table (PLT) 30002 (Fig. 32) is placed within the PA message 30000, and the acquisition destination of another PA message 30000 can be described by MMT_general_location_info (Fig. 31) within the PLT. By specifying the acquisition destination of this PA message 30000, the PA message 30000 can be made into a hierarchical structure. The location types of the acquisition destination of the PA message 30000 and the asset 30003 are shown in Fig. 33.

[0314] Normally, the hierarchical structure of the PA message 30000 is limited to two levels as shown in FIG. 28, but it is also possible to increase the number of levels by placing a PLT 30002 in the PA message 30000 at the second level.

[0315] Since an asset is composed of Media Processing Units (MPUs) which serve as processing units (Figure 29), the presentation area of ​​the asset 30003 is specified by specifying the presentation area of ​​the MPU in the MPU presentation area specification descriptor (Figure 34). The MPU presentation area specification descriptor is placed in the asset descriptor area of ​​the MPT. Since the presentation area is specified for each MPU, it is also possible to use a presentation method in which the presentation area of ​​the same asset 30003 is changed during presentation. In order to reduce the amount of data, a control method is also possible in which the presentation area is not specified for all MPUs belonging to the asset, but only the presentation area of ​​the first MPU and the first MPU of the group of MPUs whose presentation area is to be changed.

[0316] [Example of asset presentation] <Example 1> The broadcast receiving device 100 obtains the presentation area information by reading the LCT 30100. FIG. 16 shows a flow in which the broadcast receiving device 100 obtains the control information of a program as an example of channel switching. The LCT 30100 is arranged in an MMTP packet and transmitted, just like the MPT 30001. Since the MPT 30001 describes the designation information of the presentation area of ​​the asset 30003, it is preferable that the LCT 30100 is obtained before the MPT 30001. As shown in FIG. 16, it is preferable that the LCT 30100 is obtained as a step between S209 and S210 and between S214 and S215. Even if the LCT cannot be obtained at the above timing, it is equally preferable if the LCT can be obtained before S216.

[0317] LCT30100 is placed in PA message 30000, but LCT30100 related to asset 30003 corresponding to the second layer PA message is placed in the first layer PA message 30000 or the second layer PA message 30000. When presenting asset 30003, the presentation area information of LCT30100 placed in the PA message 30000 to which the asset 30003 to be presented belongs is used preferentially. If LCT30100 is not placed in the PA message 30100 to which the asset 30003 belongs, the presentation area information of LCT30100 placed in the PA message 30100 of the upper layer is used.

[0318] By using the method of this operation example, if the same LCT30100 is used for the entire program data in Figure 28, by placing a common LCT30100 in the first layer PA message 30000, presentation area information can be obtained at an early stage, making it possible to present program data quickly.

[0319] <Example 2> If LCT30100 is not included in the MMTP packet, it uses the presentation area information of LCT30100 that has been acquired up to that point. In other words, the broadcast receiving device stores the presentation area information of LCT30100, and updates the stored presentation area information each time a new LCT30100 is acquired.

[0320] However, immediately after an event occurs that invalidates the presentation area information used up until that point, such as when the power is turned on or the channel is changed, there is still no valid presentation area information, so even if video data or audio data of a program is acquired, it may not be possible to present that data. Therefore, until valid presentation area information is acquired, presentation processing is performed assuming that the presentation area shown in FIG. 19A, for example, is set as temporary presentation area information. The setting in FIG. 19A will be referred to as the default setting hereinafter. The presentation area shown in the default setting (FIG. 19A) is a device with device_id of 0, i.e., the main device, in which a full-screen display area is set, and 0 is assigned to layout_number, region_number, and layer_order.

[0321] Fig. 35A shows a state in which only the main asset 30201 is presented using temporary presentation area information, while Fig. 35B shows a state in which, after acquiring LCT 30100, sub-asset 30202 is also presented according to the original presentation area information of the program. When temporary presentation area information is used, the presentation area designation of the main asset is ignored, an area with layout_number 0 and region_number 0 is designated, and other assets are not presented. Note that here, a main asset refers to an asset that designates region_number 0 on the main device or an asset that designates region_number 0 in an asset transmitted by broadcast waves, and a sub-asset refers to any other asset.

[0322] By setting provisional presentation area information in this manner, it becomes possible to perform at least the presentation process of the main asset even before the information of the LCT30100 is read.

[0323] <Example 3> In the operation example 2, an example was shown in which only the main asset is presented using the default presentation area information until a new LCT30100 is obtained when changing channels, etc., but the LCT30100 used in the program that was being viewed up until that point may also be used. The asset (main asset) specified in the area with region_number 0 in the program after the channel change is presented in the area with region_number 0 in the presentation area information that was used up until that point, and other assets (sub-assets) are not displayed.

[0324] After acquiring the LCT30100 of the program after the channel change, all assets are presented using the presentation area information. If the LCT30100 used in the previously viewed program divides the display area as shown in Fig. 19B, the process of operation example 2 may be performed, and if the LCT30100 used in the previously viewed program performs an overlay display as shown in Fig. 19C, the process of operation example 3 may be performed. If the LCT30100 used in the previously viewed program has an area with region_number 1 or later, a predetermined pattern or message may be displayed in the area.

[0325] In this way, by using the presentation area information of the program that has been viewed up until that point, it becomes possible to perform at least the presentation processing of the main asset even before the information of LCT30100 is read.

[0326] <Example 4> Since there may be cases where the channel is returned to the original channel after being changed, a method may be used in which the LCT30100 information once read is stored in association with the channel information, and the stored presentation area information is used when the channel is returned. Note that if the most recent LCT30100 is stored for each of all channels that can be received by the broadcast receiving device 100, the convenience of controlling the presentation area when changing channels is improved.

[0327] Also, since the presentation area information may change even during a program, an expiration date is set in the LCT30100, and if the expiration date has passed when the channel is returned, the presentation area information is not used, and the default settings are used or only the main asset is presented using the presentation area information of the program that was being viewed up until that point, as shown in Operation Example 2 or Operation Example 3. Alternatively, only the main asset may be presented using the presentation area information of the channel whose expiration date has expired. Of course, after a new LCT30100 is obtained, the normal presentation method is restored. The control may be performed by referring to the expiration date, but may also be performed by referring to the version instead of the expiration date information.

[0328] An example of setting an expiration date in LCT 30100 is shown in Figure 36A. It is set in the LCT expiration date descriptor in NTP length format (ending_time). The descriptor is placed in the descriptor area of ​​LCT 30100 (Figure 18).

[0329] Alternatively, as shown as a layout expiration date descriptor in FIG. 36B, an expiration date may be set for each layout.

[0330] Alternatively, as shown as a presentation area expiration date descriptor in FIG. 36C, an expiration date may be set for each area.

[0331] The expiration date may be set in a single layer or in multiple layers. When the expiration date is set in multiple layers, the earlier expiration date is given priority for each area.

[0332] This method allows presentation area information that has been acquired to be used effectively while taking into account the expiration date.

[0333] <Example 5> In operation example 4, the presentation area information of a program is read once and stored, but it is also possible to prepare presentation area information (common presentation area information) to be used commonly by multiple programs on a channel for each channel, acquire the common presentation area information in advance in broadcast receiving device 100, and use the common presentation area information for each program.

[0334] The common presentation area information is acquired in advance by the broadcast receiving device 100 in the format of the LCT (FIG. 18). To indicate that it is common presentation area information, the common presentation area descriptor shown in FIG. 37 is used. This descriptor is placed in the descriptor area of ​​the LCT (FIG. 18), and the layout number of the common presentation area is listed together with the device number. The service_id indicates the broadcast channel. Furthermore, the start time (beginning_time) and end time (ending_time) of the validity period of the common presentation area information are described in NTP long format. Also, a full_set_flag is described so that it can be confirmed that all information is present when updating information. The meaning of the full_set_flag is summarized in FIG. 38.

[0335] This common presentation area information may be read once a day or once a week, for example, outside of broadcast hours, etc. Also, it may be obtained from broadcast waves or via the Internet.

[0336] In addition, in case the common presentation area information has not been read, the common presentation area information used in the program is transmitted as LCT30100 in the program data. At that time, the full_set_flag of the common presentation area descriptor indicates that it is a part of the common presentation area information.

[0337] By using this common presentation area information, the asset 30003 can be presented promptly even immediately after the broadcast receiving device 100 is turned on or immediately after a program change, before the LCT 30100 is acquired.

[0338] <Example 6> Operation example 5 shows a method of utilizing common presentation area information, but even if the common presentation area information is transmitted via broadcast waves or the Internet on a channel, depending on the program, a presentation area with a layout not described in the common presentation area information may be used.

[0339] Specifically, layout information that is not described in the common presentation area information can be described in the LCT30100 of the program. In this case, since the layout number of the common presentation area is described in the common presentation area descriptor (FIG. 37), the broadcast receiving device 100 determines whether or not there is additional presentation area information that is not a common presentation area in the LCT30100, and uses that information if there is. In this case, if the layout number and area number of the presentation area overlap with the common presentation area information, it is determined in advance which information is to be prioritized. That is, depending on the broadcast system, the broadcast receiving device 100 may be configured to prioritize the common presentation area information. Also, depending on the broadcast system, the broadcast receiving device 100 may be configured to prioritize the presentation area information specific to the program.

[0340] Furthermore, if the common presentation area descriptor (FIG. 37) is not placed in the LCT 30100, all presentation area information written in the LCT 30100 is treated as not being common area information.

[0341] The additional presentation area information for each program may be acquired from a broadcast wave, but may also be acquired via the Internet instead of from a broadcast wave.

[0342] According to this method, it is possible to use the common presentation area information while using presentation area information optimized for each program.

[0343] <Example 7> The asset 30003 is presented in one presentation area, but in cases where it is better to display it on as many terminals as possible, such as breaking news, it is better to present the same content on all terminals available at that time.

[0344] As a specific method, in the overlap presentation area specification descriptor (Fig. 39), describe the layout_number that sets the same area on other devices among the layout settings of the main device (device with Device_id 0). This descriptor is placed in the descriptor area of ​​LCT30100 (Fig. 18).

[0345] FIG. 40 shows an example in which the same screen content is presented on a sub-device (mobile information terminal 700) in addition to the main device (broadcast receiving device 100).

[0346] In addition, in preparation for returning to the original program after the breaking news has ended, the presentation area information used in the original program may be stored and used after the breaking news has ended.

[0347] This method increases awareness of important and urgent information.

[0348] <Example 8> The presentation area of ​​each asset 30003 is specified by the layout_number (layout number) and region_number (region number) in the MPU presentation area specification descriptor (Fig. 34). If there is no presentation area information corresponding to this layout number and region number, presentation is not possible, and the asset 30003 is not presented. However, if the abnormal asset 30003 is one that is presented in a partial area of ​​the screen, it may not be immediately obvious that there is a display abnormality. Therefore, when an asset 30003 that cannot be presented occurs, an error message as shown in Fig. 41 is displayed.

[0349] This method allows the viewer to recognize that the display is not normal.

[0350] <Example 9> In the operation example 8, the operation when a presentation area without presentation area information is specified is described, but the operation when different assets 30003 specify the same presentation area is described below. In the case of an asset that displays some content, it cannot be displayed in the same presentation area, so the same presentation area must not be specified simultaneously by different assets 30003. If they are specified simultaneously, the asset transmitted by the broadcast wave is given priority. Alternatively, the presentation of the asset 30003 that first used the layout number and area number is continued, and the presentation of the asset 30003 specified later is prohibited. Alternatively, the presentation of all assets 30003 with overlapping area specifications is prohibited. If an asset 30003 that cannot be presented occurs, an error message as shown in FIG. 41 may be displayed.

[0351] However, it is possible that the same presentation area may be specified for different assets 30003, for example when adding additional asset information to a video asset to achieve higher gradation. In order to indicate that multiple assets are in a complementary relationship such that they constitute a single piece of content, dependency descriptor information is used. The data structure of the dependency descriptor is shown in Figure 42. When this dependency exists, presentation is permitted even when the same presentation area is specified.

[0352] To manage the presentation area designation of assets 30003, a management table that shows which assets 30003 designate which presentation areas may be used. An example of the management table is shown in Fig. 43. Since assets 30003 with asset IDs 1 and 3, and asset IDs 2 and 4 have a dependency relationship, they are permitted to be displayed even if the same area is designated. On the other hand, asset 30003 with asset ID 7 is a video asset, and since there is no dependency relationship and it designates the same area as asset ID 0, its presentation is prohibited.

[0353] Note that asset 30003 with asset ID 1 is transmitted by broadcast waves, so this is given priority. Also, asset 30003 with asset ID 8 is highly likely to be audio that is paired with asset ID 7 because asset 30003 with the same acquisition source has been prohibited from presentation, and so is also prohibited from presentation. Also, assets with asset IDs 2, 4, 6, and 8 are audio assets, and audio assets are not directly related to the presentation process in monitor unit 162, so they do not necessarily need to be managed in the management table. That is, only video assets may be managed in the management table.

[0354] By controlling the presentation in this manner, it is possible to prevent abnormal presentation from being made when there is an inconsistency in the control information.

[0355] <Example 10> The dependency relationship of assets 30003 may be a parallel relationship in which content is not complete unless multiple dependent assets 30003 are available, or a subordinate relationship in which data for improving image quality is provided to a subjective asset 30003 by another asset 30003. Subjective assets 30003 can be presented alone, but the presentation of dependent assets 30003 is likely to be abnormal if the subjective asset 30003 does not exist, so if the dependent asset 30003 cannot be obtained, the presentation of the dependent asset 30003 is prohibited. Note that a multi-layer structure in which a dependent asset 30003 has yet another asset 30003 subordinate thereto may be adopted.

[0356] To specify a dependency relationship, it is necessary to determine in advance whether the asset 30003 described in the dependency descriptor (Fig. 42) indicates the asset 30003 that is the dependency destination, or the asset 30003 that is dependent on the asset. In the case of assets 30003 that are in a parallel relationship, the dependency descriptor (Fig. 42) is placed so that both depend on the other.

[0357] Another method for specifying a dependency relationship is to explicitly state the dependency relationship in the dependency descriptor (Figure 42). Figure 44 shows a dependency descriptor that explicitly states a dependency relationship. A parameter called dependency_type is specified to indicate the type of dependency for the dependent asset. The meaning of dependency_type is shown in Figure 45. 0 is when one asset is dependent on the other, and 1 is when the other asset is dependent on it. In the case of a parallel relationship, each asset is specified as being dependent on the other asset.

[0358] An example of a presentation permission / prohibition management table is shown in Figure 46. Although assets with IDs 3 and 4 are subordinate to IDs 1 and 2, presentation is permitted because assets with IDs 1 and 2 have been acquired. On the other hand, presentation of assets 9 and 10 is prohibited because the subordinate assets with IDs 7 and 8 have not been acquired.

[0359] Assets with IDs 11 and 12 are mutually dependent, but since both are available, their presentation is permitted. Assets with IDs 13 and 14 are also mutually dependent, but since asset ID 14 has not been acquired, presentation of asset ID 13 is prohibited. If asset 30003 that cannot be presented occurs, an error message as shown in Figure 41 may be displayed.

[0360] In this way, by controlling the presentation while taking into consideration the subordinate relationships, it is possible to prevent abnormal presentation when there is an inconsistency in the control information.

[0361] <Example 11> The broadcast receiving device 100 can present both the asset 30003 acquired from the broadcast wave and the asset 30003 acquired from the communication line (Internet), but depending on the state of the communication line, it may be impossible to acquire the asset 30003 via the communication line, or the broadcast receiving device 100 may not be connected to the communication line in the first place. Therefore, normally, only the broadcast video of the broadcast wave is displayed in full screen using the default setting (FIG. 19A), and when the asset 30003 via the communication line is acquired, the asset 30003 may be presented in a region specified according to the setting of the LCT 30100.

[0362] For example, the case will be described in which the area setting of the LCT30100 is as shown in FIG. 19B, the broadcast video is set to be presented in area 0, and the asset 30003 via the communication line is set to be presented in area 1 and area 2. When only the broadcast wave video can be received, the broadcast video is displayed in full screen using the default setting (FIG. 19A), and when the asset 30003 via the communication line can be acquired, the area setting of the LCT30100 is used, the broadcast video is presented in area 0 in FIG. 19B, and the asset 30003 via the communication line is presented in area 1 and area 2. In this case, the LCT30100 may not be transmitted by the broadcast wave, but may be transmitted together with the asset 30003 via the communication line. By using the method of this operation example, it is possible to display according to the actual program data reception status. Note that, when only one of the assets 30003 via the communication line has been acquired and the other has not been acquired, the default setting (FIG. 19A) may be used. It is desirable to control so that the transition to the area setting in FIG. 19B occurs when assets 30003 via both communication lines are collected.

[0363] Although the embodiment of the present invention has been described above using Examples 1 to 3, the configuration for realizing the technology of the present invention is not limited to the above examples, and various modified examples are possible. For example, it is possible to replace a part of the configuration of one example with the configuration of another example, and it is also possible to add the configuration of another example to the configuration of one example. All of these belong to the scope of the present invention. Furthermore, the numerical values ​​and messages appearing in the text and figures are merely examples, and the effect of the present invention is not impaired even if different ones are used.

[0364] The functions of the present invention described above may be realized in part or in whole by hardware, for example, by designing an integrated circuit. Also, they may be realized by software, such as by a microprocessor unit interpreting and executing an operating program that realizes each function. Hardware and software may be used in combination.

[0365] The software for controlling the broadcast receiving device 100 may be stored in the ROM 103 and / or storage (accumulation) unit 110 of the broadcast receiving device 100 beforehand at the time of product shipment. It may also be acquired via the LAN communication unit 121 from another application server 500 on the Internet 200 after product shipment. In addition, the software stored in a memory card, optical disk, etc. may be acquired via the expansion interface unit 124, etc.

[0366] In addition, the control lines and information lines shown in the diagram are those considered necessary for explanation, and do not necessarily show all the control lines and information lines on the product. In reality, it can be considered that almost all components are connected to each other. [Explanation of symbols]

[0367] 100,800...broadcast receiving device, 100a...antenna, 101,801...main control unit, 102,802...system bus, 103,803...ROM, 104,804...RAM, 110,810...storage unit, 121,821...LAN communication unit, 124,824...extension interface unit, 125,825...digital interface unit, 131,831,832...tuner / demodulation unit, 132...separation unit, 141...video decoder, 142...video color gamut conversion unit, 143...audio decoder, 144...text superimposition decoder, 145...subtitle decoder, 146...subtitle synthesis unit, 147...subtitle color gamut conversion unit, 151...data decoder, 152...cache unit, 153...application control unit, 154...browser unit, 155...application color gamut conversion unit, 156...sound source unit, 161,861...video synthesis unit, 162,862...monitor unit, 163,863...video output unit, 164,864...audio synthesis unit, 165,865...speaker unit, 166,866...audio output unit, 170,870...operation input unit, 841...MMT decoding processing unit, 842...MPEG2-TS decoding processing unit, 200...Internet, 200r...router device, 200a...access point, 300t...radio tower, 300s...broadcasting satellite (or communication satellite), 300...broadcasting station server, 400...service provider server, 500...other application servers, 600...mobile telephone communication server, 600b...base station, 700...mobile information terminal.

Claims

[Claim 1] A content protection processing method in a transmission system in which a broadcast program content is transmitted from a broadcast station and the broadcast program content is received by a broadcast receiving device, comprising the steps of: a transmission step of transmitting the broadcast program content from the broadcast station side to the broadcast receiving device in the transmission system; a receiving step in which the broadcast receiving device receives the broadcast program content transmitted in the transmitting step; a storage step in which the broadcast receiving device stores the broadcast program content received in the receiving step; an output step in which the broadcast receiving device outputs the broadcast program content stored in the storage step to an external device; Equipped with In the storing step, when the broadcast program content received in the receiving step is a content for which one-generation copy protection is designated, the broadcast program content stored in the storing step is stored in an encrypted state so that the broadcast program content can be played back only by the broadcast receiving device, The storage of the broadcast program content in the storage step can be performed in a storage unit at the output destination of the IP interface via an IP interface configured with hardware compatible with Ethernet provided in the broadcast receiving device, and the storage of the broadcast program content in an encrypted state so that it can be played only by the broadcast receiving device to the storage unit at the output destination of the IP interface in the storage step and the output of the broadcast program content stored in the encrypted state so that it can be played only by the broadcast receiving device to the storage unit at the output destination of the IP interface in the storage step to the external device in the output step can be performed via the same IP interface configured with hardware compatible with Ethernet, and the output of the broadcast program content stored in the encrypted state so that it can be played only by the broadcast receiving device to the storage unit at the output destination of the IP interface in the storage step to the external device via the IP interface in the output step The output control states include a first output control state in which, when the IP address of the external device is within the same subnet mask as the IP address of the broadcast receiving device, control is performed so that the broadcast program content stored in the storage unit at the output destination of the IP interface in the storage step in a state in which the content has been encrypted so that the content can be played back only by the broadcast receiving device can be output for viewing to the external device via the IP interface in the output step and moved to the external device; and a second output control state in which, when the IP address of the external device is not within the same subnet mask as the IP address of the broadcast receiving device, control is performed so that the broadcast program content stored in the storage unit at the output destination of the IP interface in the storage step in a state in which the content has been encrypted so that the content can be played back only by the broadcast receiving device can be output for viewing to the external device paired with the broadcast receiving device via the IP interface in the output step, but moving to the external device paired with the broadcast receiving device is prohibited. Content protection processing method.

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