Content protection processing method

Abstract

To provide a digital broadcast receiver capable of executing a function with a higher added value.SOLUTION: A broadcast receiving device 40100 includes a broadcast receiving unit capable of receiving broadcast data of a broadcast program content and location information describing a reference destination for acquiring data related to the broadcast data from a broadcast transmission path, a communication unit capable of receiving communication data of a program content from the reference destination described in the location information via a communication line, a recording and reproducing unit capable of recording and reproducing the broadcast data of the broadcast program content received by the broadcast receiving unit, an output unit that outputs the broadcast data of the broadcast program content reproduced from the recording and reproducing unit to an external device, and a server function unit having a server function for the external device. In the output state from the output unit, the location information in which the description of the reference destination is rewritten to the description indicating the server function unit is output together with the broadcast data reproduced from the recording and reproducing unit.SELECTED DRAWING: Figure 29A

Description

[Technical Field]

[0001] The present invention relates to a content protection processing method. [Background technology]

[0002] One of the extension functions of digital broadcasting services 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] Japanese Patent Application Laid-Open No. 2001-186486 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 enhancements. 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 / high definition video content. However, it is difficult to provide high-value-added television receivers that can meet these demands by simply utilizing the data broadcasting reception function and the like that is provided in current television receivers or by simply enhancing the function of the data broadcasting reception function and the like.

[0005] An object of the present invention is to realize a content protection processing method that can execute higher value-added functions. [Means for solving the problem]

[0006] The technology described in the claims is used as a means for solving the above problems.

[0007] As an example, a content protection processing method in a broadcast receiving device of a transmission system in which control information related to a broadcast program and broadcast program content are transmitted from a broadcast station side and the control information and the broadcast program content are received by a receiving unit of the broadcast receiving device, the method comprising: a receiving step of receiving the control information related to the broadcast program and the broadcast program content by the receiving unit of the broadcast receiving device; a recording reservation step of reserving a recording of the broadcast program using an EIT containing information related to an event out of the control information received in the receiving step; a storage step of storing the broadcast program content received by the receiving unit of the broadcast receiving device in the receiving step using copy control information out of the control information received by the receiving unit of the broadcast receiving device in the receiving step for the broadcast program reserved for recording in the recording reservation step; and controlling acquisition of video using an AIT containing information related to an application out of the control information received in the receiving step, and a video output step of outputting the video of the broadcast program content received by the receiving unit of the broadcast receiving device. In the storage step, if the broadcast program content received by the receiving unit of the broadcast receiving device in the receiving step is content that has been transmitted in the transmission system with copy control information included in the control information specifying protection for one generation of copying, the broadcast program content is stored in an encrypted state so that it can be played back only by the broadcast receiving device. In the storage step, the broadcast program content received by the receiving unit of the broadcast receiving device in the receiving step can be stored in a storage unit at the output destination of an IP interface configured by hardware compatible with Ethernet provided in the broadcast receiving device, and the EIT includes information regarding the event following the current event. [Effects of the Invention]

[0008] By using the technology of the present invention, it is possible to realize a content protection processing method that can execute functions with higher added value. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a system configuration diagram illustrating 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] This is a diagram showing the configuration of the MPU in MMT. [Figure 2C] This is a diagram showing the structure of an MMTP packet in MMT. [Figure 3] This is a conceptual diagram of the protocol stack of a broadcasting system that uses MMT. [Figure 4] FIG. 1 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 the MMT-SI of the broadcasting system. [Figure 6C] This is a list (part 1) of descriptors used in the MMT-SI broadcasting system. [Figure 6D] This is a list of descriptors used in the MMT-SI 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] 1 is a configuration diagram of a logical plane structure of a presentation function of a broadcast receiving device according to a first embodiment. [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. FIG. [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. 1 is a block diagram of a portable information terminal according to a 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] FIG. 10 is a diagram illustrating the format of the JST_time parameter of a broadcasting system. [Figure 12] 10 is a diagram illustrating a method for calculating the current date from the MJD of the broadcast receiving device according to the first embodiment. FIG. [Figure 13A] FIG. 1 is a diagram showing the configuration of an NTP format for a broadcasting system. [Figure 13B] A diagram showing the data structure of an MPU timestamp descriptor for a broadcasting system. [Figure 13C] FIG. 10 is a diagram showing the data structure of time information in the TMCC extended information area of ​​a broadcasting system. [Figure 14] FIG. 3 is an operational sequence diagram of the broadcast receiving device according to the first embodiment during channel scanning. [Figure 15A] A diagram showing the data structure of TLV-NIT of a broadcasting system. [Figure 15B] FIG. 10 is a diagram illustrating the data structure of a satellite distribution system descriptor for a broadcasting system. [Figure 15C] FIG. 10 is a diagram illustrating the data structure of a service list descriptor for a broadcasting system. [Figure 15D] FIG. 10 is a diagram showing the data structure of an AMT of a broadcasting system. [Figure 16] 4 is an operational sequence diagram of the broadcast receiving device according to the first embodiment when selecting a channel. FIG. [Figure 17] FIG. 1 is a diagram showing the data structure of an MPT of a broadcasting system. [Figure 18] A diagram showing the data structure of the LCT of the broadcasting system. [Figure 19A] FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19B] FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19C] FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19D] FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 20A] 10A and 10B are diagrams illustrating the operation of exception handling in screen layout control based on LCT. [Figure 20B] 10A and 10B are diagrams illustrating the operation of exception handling in screen layout control based on LCT. [Figure 21] FIG. 10 is a diagram showing the data structure of the MH-EIT of the broadcasting system. [Figure 22A] 3 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 22B] 3 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 22C] 3 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 23] 3 is a diagram showing a screen display when an emergency alert broadcast is displayed on the broadcast receiving device according to the first embodiment. FIG. [Figure 24] FIG. 10 is a block diagram of a broadcast receiving device according to a second embodiment. [Figure 25] 10A and 10B are diagrams illustrating inconsistencies in the current time display when switching broadcast services. [Figure 26A] FIG. 10 is a diagram illustrating the operation of current time information reference source selection control according to the second embodiment. [Figure 26B] FIG. 10 is an operation sequence diagram of a current time information update process according to the second embodiment. [Figure 27A] FIG. 10 is a screen display diagram of an EPG screen of a broadcast receiving device according to a second embodiment. [Figure 27B] FIG. 10 is a screen display diagram of an EPG screen of a broadcast receiving device according to a second embodiment. [Figure 28] FIG. 10 is a system configuration diagram of a broadcast communication system according to a third embodiment. [Figure 29A] FIG. 10 is a block diagram of a broadcast receiving device according to a third embodiment. [Figure 29B] FIG. 10 is a software configuration diagram of a broadcast receiving device according to a third embodiment. [Figure 30] FIG. 11 is a diagram illustrating an interface configuration between a broadcast receiving device and a monitor device according to a third embodiment. [Figure 31] FIG. 1 is a diagram illustrating a package configuration of a broadcasting service. [Figure 32A] FIG. 10 is a screen display diagram illustrating a recording reservation setting screen of a broadcast receiving device according to a third embodiment. [Figure 32B] FIG. 10 is a screen display diagram illustrating a menu configuration of a broadcast receiving device according to a third embodiment. [Figure 33A] A diagram showing the data structure of the MH-AIT of the broadcasting system. [Figure 33B] This is a list of MH-AIT parameters and descriptors for the broadcasting system. [Figure 34] FIG. 11 is a screen display diagram illustrating a recorded program list screen of a broadcast receiving device according to a third embodiment. [Figure 35A] FIG. 10 is a diagram illustrating an output format of a broadcast receiving device according to a fourth embodiment. [Figure 35B] FIG. 10 is a diagram illustrating an output format of a broadcast receiving device according to a fourth embodiment. [Figure 35C] FIG. 10 is a diagram illustrating an output format of a broadcast receiving device according to a fourth embodiment. [Figure 35D] FIG. 10 is a diagram illustrating an output format of a broadcast receiving device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. Example 1

[0011] [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 broadcast station radio tower 300t, a broadcast satellite (or 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.

[0012] 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 going 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 via communication with each server device and other communication devices on the Internet 200.

[0013] The router device 200r is connected to the Internet 200 via wired communication, and is connected to the broadcast receiving device 100 via wired or wireless communication, and to the mobile information terminal 700 via wireless communication. The wireless communication may use a method such as Wi-Fi (registered trademark). This allows each server device or other communication device on the Internet 200 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 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.

[0014] 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, etc. The broadcast satellite (or communication satellite) 300s is a repeater that receives broadcast waves transmitted from the broadcasting station's radio tower 300t, performs appropriate frequency conversion, etc., 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 stores broadcast programs (video content, etc.) and metadata for each broadcast program, such as the program title, program ID, program summary, cast information, and broadcast date and time, and is capable of providing 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 via an API (Application Programming Interface) provided by the broadcasting station server 300.

[0015] The service provider server 400 is a server device provided by a service provider and is capable of providing various services linked to broadcast programs distributed by broadcast stations. The service provider server 400 stores, manages, and distributes video content and metadata provided by the broadcast station server 300, as well as various content and applications linked to broadcast programs. The service provider server 400 also has the function of searching for and providing a list of available content and applications in response to inquiries from television receivers and 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. Multiple service provider servers 400 may be provided for different services. The broadcast station server 300 may also have the functions of the service provider server 400.

[0016] The other application server 500 is a known server device that stores, manages, and distributes other general applications, operating programs, content, data, etc. There may be multiple other application servers 500 on the Internet 200.

[0017] 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 communications (calls) and data transmission / reception of the mobile information terminal 700 via the mobile telephone communication network, and enables data transmission / reception between the mobile information terminal 700 and each server device or other communication device on the Internet 200. The communication between the base station 600b and the mobile information terminal 700 may be performed using the W-CDMA (Wideband Code Division Multiple Access) (registered trademark) system, the GSM (Global System for Mobile communications) (registered trademark) system, the LTE (Long Term Evolution) system, or other communication systems.

[0018] The mobile information terminal 700 has functions for telephone communication (calls) and data transmission / reception via a mobile telephone communication network, as well as functions for wireless communication using Wi-Fi (registered trademark) or the like. The mobile information terminal 700 can connect to the Internet 200 via a router device 200r or an 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 through communication with each server device and other communication devices on the Internet 200. The access point 200a is connected to the Internet 200 via wired communication, and is connected to the mobile information terminal 700 via wireless communication. The wireless communication may use a method such as Wi-Fi (registered trademark). Note that 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.

[0019] [Overview of the MMT method] 1 is a television receiver that supports MMT (MPEG Media Transport), which is an alternative to the 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 also be compatible with both MPEG2-TS and MMT.

[0020] 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. Because the clock is 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, the diversification of content, the diversification of devices that use content, the diversification of transmission paths for delivering content, and the diversification of content storage environments have made it difficult for MPEG2-TS to adapt to these changes in the content delivery environment. Therefore, a new media transport method, MMT, has been established.

[0021] FIG. 2A shows an example of an outline of an encoded signal in MMT according to this embodiment. As shown in the figure, the MMT according to this embodiment has MFUs (Media Fragment Units), MPUs (Media Processing Units), MMTP (MMT Protocol) payloads, and MMTP packets 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 or access unit units. The MPU may be configured with MPU metadata containing information about the overall configuration of the MPU, movie fragment metadata containing information about the encoded media data, and sample data, which is the encoded media data. It is also assumed that the MFU can be extracted from the sample data. For media such as video components and audio components, the presentation time and decoding time may be specified in MPU or access unit units. FIG. 2B shows an example of the configuration of an MPU.

[0022] An MMTP packet consists of a header section and an MMTP payload, and carries MFUs and MMT control information. The MMTP payload has a payload header corresponding to the content (data unit) stored in the payload section. Figure 2C shows an example of an overview of how an MFU is constructed from a video / audio signal, then stored in the MMTP payload to construct an MMTP packet. Note that for video signals encoded using inter-frame prediction, it is desirable to construct MPUs in GOP (Group of Pictures) units. Furthermore, 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. Furthermore, if the size of the MFU to be transmitted is large, one MFU may be divided and stored in multiple payload sections. Furthermore, MMTP packets may be protected using techniques such as Application Layer Forward Error Correction (AL-FEC) and Automatic Repeat Request (ARQ) to recover from packet loss on the transmission path.

[0023] In the broadcasting system of this embodiment, MPEG-H HEVC (High Efficiency Video Coding) is used as the video encoding method, and MPEG-4 AAC (Advanced Audio Coding) or MPEG-4 ALS (Audio Lossless Coding) is used as the audio encoding method. The encoded data of the video and audio of a broadcast program encoded by each of the above methods is in MFU or MPU format, and then loaded onto an MMTP payload to be packetized as MMTP packets and transmitted in IP (Internet Protocol) packets. Data content related to the broadcast program may also be in MFU or MPU format, and then loaded onto an MMTP payload to be packetized as MMTP packets and transmitted in IP packets. Four types of data content transmission methods are provided: a subtitle / superimposed text 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 synchronously or asynchronously.

[0024] 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. Furthermore, the TLV (Type Length Value) multiplexing method is used on the broadcast transmission path for efficient transmission of IP packets. An example of the protocol stack for the broadcast 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.

[0025] The broadcasting system of this embodiment provides a mechanism for transmitting two types of control information: MMT-SI (MMT-Signaling Information) and TLV-SI (TLV-Signaling Information). 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 information corresponding to IP addresses and services.

[0026] Furthermore, in broadcasting systems using MMT, time information is 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. To provide UTC, IP packets in NTP (Network Time Protocol) format are used.

[0027] [Control information for broadcasting systems using MMT] In the broadcast system to which the broadcast receiver 100 of this embodiment corresponds, 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 receiver 100 to demultiplex the IP packets multiplexed on the 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 structure of the control information used in the broadcast system of this embodiment is shown in FIG. 4.

[0028] FIG. 5A shows a list of the "tables" used in the TLV-SI of the broadcast system to which the broadcast receiver 100 of this embodiment corresponds. In this embodiment, the following are used as the "tables" of TLV-SI.

[0029] (1) TLV-NIT The Network Information Table for TLV (TLV-NIT) represents information regarding the physical configuration of the TLV stream transmitted by the network and the characteristics of the network itself.

[0030] (2) AMT The Address Map Table (AMT) provides a list of the multicast groups of the IP packets constituting each service transmitted in the network.

[0031] (3) Table set by the operator In addition, it is possible to prepare a table independently set by a service provider or the like.

[0032] <Descriptor used in TLV-SI> Fig. 5B shows a list of "descriptors" arranged in the TLV-SI of the broadcast system to which the broadcast receiver 100 of the present embodiment corresponds. In the present embodiment, the following are used as the "descriptors" of the TLV-SI.

[0033] (1) Service list descriptor The service list descriptor provides a list of services based on service identification and service format type.

[0034] (2) Satellite distribution system descriptor The satellite distribution system descriptor indicates the physical conditions of the satellite transmission path.

[0035] (3) System management descriptor The system management descriptor is used to distinguish between broadcast and non-broadcast.

[0036] (4) Network name descriptor The network name descriptor describes the network name with alphanumeric characters.

[0037] (5) Descriptor set by the operator In addition, it is possible to prepare a descriptor independently set by a service provider or the like.

[0038] <Message used in MMT-SI> Fig. 6A shows a list of "messages" used in the MMT-SI of the broadcast system to which the broadcast receiver 100 of the present embodiment corresponds. In the present embodiment, the following are used as the "messages" of the MMT-SI.

[0039] (1) PA message The Package Access (PA) message is used to transmit various tables.

[0040] (2) M2 Section Message The M2 section message is used to transmit the section extension format of MPEG-2 Systems.

[0041] (3) CA Message The CA message is used to transmit a table for identifying the restricted reception method.

[0042] (4) M2 Short Section Message The M2 short section message is used to transmit the short section format of MPEG-2 Systems.

[0043] (5) Data Transmission Message The data transmission message is a message that stores a table related to data transmission.

[0044] (6) Messages Set by the Operator In addition, it is possible to prepare messages independently set by service providers and the like.

[0045] <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 receiver 100 of this 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 this embodiment, the following are used as the 'tables' of MMT-SI.

[0046] (1) MPT The MMT package table (MMT Package Table: MPT) provides information constituting a package such as a list of assets and the positions of assets on the network. The MPT may be stored in the PA message.

[0047] (2) PLT The Package List Table (PLT) lists the IP data flows and packet IDs that transmit PA messages of MMT packages provided as broadcast services, as well as the IP data flows that transmit IP services. The PLT may be stored in the PA message.

[0048] (3)LCT The Layout Configuration Table (LCT) is used to associate layout information for presentation with a layout number, and can be stored in the PA message.

[0049] (4)ECM The 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 the M2 section message.

[0050] (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.

[0051] (6) CAT(MH) The Conditional Access Table (CAT) (MH) is used to store descriptors for identifying conditional access systems. The CAT (MH) may be stored in a CA message.

[0052] (7) DCM The Download Control Message (DCM) transmits key-related information, such as a key for decrypting a transmission path encryption for downloading. The DCM may be stored in the M2 section message.

[0053] (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 the M2 section message.

[0054] (9)MH-EIT The MH-Event Information Table (MH-EIT) is time-series information about events included in each service. The MH-EIT may be stored in the M2 section message.

[0055] (10)MH-AIT The MH-Application Information Table (MH-AIT) stores all information related to applications and the activation state required for the application, etc. The MH-AIT may be stored in the M2 section message.

[0056] (11)MH-BIT The MH-Broadcaster Information Table (MH-BIT) is used to present information about broadcasters present on the network. The MH-BIT may be stored in the M2 section message.

[0057] (12)MH-SDTT The MH-Software Download Trigger Table (MH-SDTT) is used for download notification information and may be stored in the M2 section message.

[0058] (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 program channel, such as the program channel name, the broadcaster name, etc. The MH-SDT can be stored in the M2 section message.

[0059] (14)MH-TOT The MH-Time Offset Table (MH-TOT) carries JST time and date (Modified Julian Day) information. The MH-TOT may be stored in the M2 short section message.

[0060] (15)MH-CDT The MH-Common Data Table (MH-CDT) is used to transmit common data in section format to be stored in non-volatile memory for all receivers that receive this. The MH-CDT may be stored in an M2 section message.

[0061] (16) DDM Table A Data Directory Management Table (DDM table) provides a directory structure of files that constitute an application in order to separate the file structure of the application from the structure for file transmission. The DDM table can be stored in a data transmission message.

[0062] (17) DAM Table The Data Asset Management Table (DAM table) provides the configuration of the MPUs in the asset and version information for each MPU. The DAM table can be stored in a data transmission message.

[0063] (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 the data transmission message.

[0064] (19) EMT The Event Message Table (EMT) is used to transmit information related to event messages. The EMT may be stored in the M2 section message.

[0065] (20) Tables set by the operator In addition, it is possible to prepare tables independently set by service providers and the like.

[0066] <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.

[0067] (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.

[0068] (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 the M2 section message.

[0069] (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.

[0070] (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.

[0071] (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.

[0072] (6) Dependency Descriptor The dependency descriptor provides the asset ID of the dependent asset. The dependency descriptor can be placed in the MPT.

[0073] (7) Access control descriptor The access control descriptor provides information for identifying the conditional access scheme. The access control descriptor can be placed in the MPT or CAT(MH).

[0074] (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).

[0075] (9) Message authentication method descriptor The message authentication method descriptor provides information for identifying the message authentication method when performing message authentication. The message authentication method descriptor can be placed in the MPT or CAT(MH).

[0076] (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.

[0077] (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 audio stream of ISO / IEC 14496-3 (MPEG-4 Audio). The MH-MPEG-4 Audio Descriptor can be placed in the MPT.

[0078] (12) MH-MPEG-4 Audio Extension Descriptor The MH-MPEG-4 Audio Extension Descriptor is used to describe the profile and level of an MPEG-4 audio stream and encoding method specific settings. The MH-MPEG-4 Audio Extension Descriptor can be placed in the MPT.

[0079] (13) MH-HEVC Video Descriptor The MH-HEVC video descriptor is used to describe the basic coding parameters of a video stream (HEVC stream) in ITU-T Recommendation H.265 | ISO / IEC 23008-2. The MH-HEVC video descriptor can be placed in the MPT.

[0080] (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.

[0081] (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 them. The MH-Event Group Descriptor may be placed in the MH-EIT.

[0082] (16) MH-Service List Descriptor The MH-Service List Descriptor provides a list of services by service identification and service type. The MH-Service List Descriptor may be placed in the MH-BIT.

[0083] (17)MH-Short Form Event Descriptor The MH-Short Event Descriptor represents the event name and a short description of the event in text form. The MH-Short Event Descriptor can be placed in the MH-EIT.

[0084] (18) MH-Extended Event Descriptor The MH-Extended Event Descriptor is used in addition to the MH-Short Event Descriptor to provide a detailed description of the event. The MH-Extended Event Descriptor may be placed in the MH-EIT.

[0085] (19) Video Component Descriptor The video component descriptor indicates parameters and descriptions related to the video component and is also used to express the elementary stream in text form. The video component descriptor may be placed in the MPT or MH-EIT.

[0086] (20) MH-Stream Identification Descriptor The MH-Stream Identification Descriptor is used to label the component stream of a service and to reference the description indicated by the video component descriptor in the MH-EIT using this label. The MH-Stream Identification Descriptor may be placed in the MPT.

[0087] (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.

[0088] (22) MH-Parental Rate Descriptor The MH-ParentalRating Descriptor is used to indicate age-based viewing restrictions and to extend them to other restriction conditions. The MH-ParentalRating Descriptor can be placed in the MPT or the MH-EIT.

[0089] (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 text format. The MH-Audio Component Descriptor can be placed in the MPT or the MH-EIT.

[0090] (24)MH-Target Area Descriptor The MH-Target Region Descriptor is used to describe the region targeted by a program or some of the streams that make up a program. The MH-Target Region Descriptor may be placed in the MPT.

[0091] (25) MH-Series Descriptor The MH-series descriptor is used to identify a series of programs and may be placed in the MH-EIT.

[0092] (26) MH-SI Transmission Parameter Descriptor The MH-SI transmission parameter descriptor is used to indicate the transmission parameters of the SI, and may be located in the MH-BIT.

[0093] (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.

[0094] (28)MH-Service Descriptor The MH-service descriptor represents the name of the organization channel and the name of its operator together with the service format type in character codes. The MH-service descriptor may be placed in the MH-SDT.

[0095] (29) IP Data Flow Descriptor The IP data flow descriptor provides information about the IP data flows that make up a service. The IP data flow descriptor can be placed in the MH-SDT.

[0096] (30)MH-CA startup descriptor The MH-CA startup descriptor describes startup information for starting a CAS program on the CAS platform. The MH-CA startup descriptor can be placed in the MPT or CAT (CA).

[0097] (31) MH-Type Descriptor The MH-Type descriptor indicates the type of file transmitted by the application transmission method. The MH-Type descriptor can be placed in the DAM table.

[0098] (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.

[0099] (33)MH-Expire Descriptor The MH-Expire descriptor describes the expiration date of an item. The MH-Expire descriptor can be placed in the DAM table.

[0100] (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 can be placed in the DAM table.

[0101] (35) MH-Data Encoding Method Descriptor The MH-Data Coding Descriptor is used to identify the data coding scheme. The MH-Data Coding Descriptor can be placed in the MPT.

[0102] (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.

[0103] (37) Event Message Descriptor The event message descriptor conveys information about the event message in general and can be placed in the EMT.

[0104] (38)MH-Local Time Offset Descriptor The MH-Local Time Offset Descriptor is used when daylight saving time is in effect to provide a certain offset value between the actual time (e.g., UTC+9 hours) and the displayed time in the human system. The MH-Local Time Offset Descriptor may be placed in the MH-TOT.

[0105] (39)MH-Component Group Descriptor The MH-component group descriptor defines and identifies the combination of components in an event and can be placed in the MH-EIT.

[0106] (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.

[0107] (41) MPU Extended Timestamp Descriptor The MPU extended timestamp descriptor provides the decoding time of an access unit within the MPU. The MPU extended timestamp descriptor may be placed in the MPT.

[0108] (42) MPU Download Content Descriptor The MPU download content descriptor is used to describe attribute information of content downloaded using an MPU. The MPU download content descriptor may be placed in the MH-SDTT.

[0109] (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.

[0110] (44)MH-Application Descriptor The MH-application descriptor describes information about an application and may be placed in the MH-AIT.

[0111] (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.

[0112] (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 can be placed in the MH-AIT.

[0113] (47)MH-Application Boundary Authority Setting Descriptor The MH-application boundary authority setting descriptor is used to set an application boundary and to set broadcast resource access authority for each area (URL). The MH-application boundary authority setting descriptor may be placed in the MH-AIT.

[0114] (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.

[0115] (49)MH-Cache Information Descriptor The MH-cache information descriptor is written to be used for cache control when the resources that make up an application are cached and stored when the application is expected to be reused. The MH-cache information descriptor may be placed in the MH-AIT.

[0116] (50)MH-Probabilistic Adaptive Delay Descriptor The MH-probabilistic application delay descriptor is described to delay the timing of application control by a probabilistic delay amount, assuming load balancing of server access for application acquisition. The MH-probabilistic application delay descriptor may be placed in the MH-AIT.

[0117] (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.

[0118] (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 placed in the DCC table.

[0119] (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 placed in the DCC table.

[0120] (54) Descriptors set by the operator In addition, it is possible to prepare descriptors independently set by service providers or the like.

[0121] <Relationship between Data Transmission and Each Control Information in MMT Method> Here, with reference to FIG. 6E, the relationship between data transmission and representative tables in the broadcast system corresponding to the broadcast receiving apparatus 100 of the present embodiment will be described.

[0122] In the broadcast system corresponding to the broadcast receiving apparatus 100 of the present embodiment, data transmission can be performed through a plurality of paths, such as a TLV stream via a broadcast transmission path or 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.

[0123] The assets that make up a package can be only assets in a TLV stream, but as shown in Fig. 6E, they can also include assets transmitted via IP data flows on communication lines. This can be achieved by including location information (corresponding to "MMT_general_location_info()" shown in Fig. 17, which will be described later) of each asset included in the package in the MPT, so that the broadcast receiving device 100 of this embodiment can 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 flow (location_type=0x01) (3) Data multiplexed in IPv6 data flows (location_type=0x02) (4) Data multiplexed into 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.

[0124] Of 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 shown in FIG. 7A (described later). When the MPT is also transmitted as part of the IP data flow on the communication line, the reference destination of (1) may be an IP data flow received via the communication line by the LAN communication unit 121 (described later). Also, (2), (3), (5), and (6) are IP data flows received via the communication line by the LAN communication unit 121 (described later). Also, (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 system and a receiving function for receiving digital broadcast signals using the MPEG2-TS system, such as the broadcast receiving device 800 of the second embodiment shown in FIG. 24 (described later), to refer to data multiplexed in the MPEG2-TS received by the receiving function for receiving digital broadcast signals using the MPEG2-TS system, based on the location information ("MMT_general_location_info()") of the MPT included in the digital broadcast signals using the MMT system.

[0125] 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 this "package" unit is treated as a "service" unit for digital broadcasting.

[0126] Furthermore, the MPT describes presentation time information for each MPU designated by the MPT (corresponding to the "mpu_presentation_time" parameter shown in FIG. 13B, which will be described later), and using this presentation time information, it becomes possible to present (display, output, etc.) multiple MPUs designated by the MPT in a synchronized manner based on a clock based on NTP, which is time information in UTC notation. Presentation control of various data using this NTP-based clock will be described later.

[0127] The data transmission method of this embodiment shown in Figure 6E also has the concept of an "event." An "event" is a concept that indicates a so-called "program" handled by the MH-EIT that is 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 from the start time stored in the MH-EIT (corresponding to the "start_time" parameter shown in Figure 21, which will be described later) to the duration (corresponding to the "duration" parameter shown in Figure 21, which will be described later) is the data included in the concept of the "event." The MH-EIT can be used in the broadcast receiving device 100 of this embodiment for various processes on an "event" basis (for example, generating a program guide, controlling recording and viewing reservations, and copyright management processes such as temporary storage).

[0128] [Broadcast receiving device hardware configuration] 7A is a block diagram showing an example of the internal configuration of broadcast receiving device 100. Broadcast receiving device 100 is made up of main control unit 101, system bus 102, ROM 103, RAM 104, storage (accumulation) unit 110, LAN communication unit 121, extension interface unit 124, digital interface unit 125, tuner / demodulation unit 131, 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, video synthesis unit 161, monitor unit 162, video output unit 163, audio synthesis unit 164, speaker unit 165, audio output unit 166, and operation input unit 170.

[0129] 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 within the broadcast receiving device 100.

[0130] The ROM (Read Only Memory) 103 is a non-volatile memory that stores basic operation programs such as an operating system and other operation programs, and may be a rewritable ROM such as an EEPROM (Electrically Erasable Programmable ROM) or a flash ROM. The ROM 103 may also 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 programs and other operation programs are executed. The ROM 103 and the RAM 104 may be integrated with the main control unit 101. The ROM 103 may not be an independent configuration as shown in FIG. 7A, but may use a partial storage area within the storage (accumulation) unit 110.

[0131] The storage (accumulation) unit 110 stores the operating programs 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 operating programs downloaded via the Internet 200 and various data created by the operating 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 portion of the storage (accumulation) unit 110 may replace all or part of the functions of the ROM 103. Furthermore, the storage (accumulation) unit 110 needs to retain the stored information even when power is not supplied to the broadcast receiving device 100 from an external source. Therefore, devices such as nonvolatile semiconductor memory such as flash ROM or SSD (Solid State Drive), or magnetic disk drive such as HDD (Hard Disk Drive) are used.

[0132] It should be noted that the operation programs stored in the ROM 103 and storage (accumulation) unit 110 can be added, updated, and have their functions expanded by downloading from each server device on the Internet 200 .

[0133] 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 thereof) of a program transmitted via a communication line. The connection with 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, etc. The broadcast receiving device 100 may also include other communication units such as a Bluetooth (registered trademark) communication unit, an NFC communication unit, or an infrared communication unit.

[0134] The tuner / demodulator 131 receives broadcast waves transmitted from a radio tower 300t via the antenna 100a, and tunes (selects) to 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 acquire an MMT data string. Note that while the example shown in FIG. 7A illustrates a configuration with one tuner / demodulator, the broadcast receiving device 100 may be configured to include multiple tuner / demodulators for purposes such as simultaneous display on multiple screens or recording of a different program.

[0135] The demultiplexer 132 is an MMT decoder that distributes real-time presentation elements, such as a video data string, an audio data string, a superimposed text data string, and a subtitle data string, to the video decoder 141, the audio decoder 143, the superimposed text data string, and the subtitle decoder 145, based on control signals in the input MMT data string. The data input to the demultiplexer 132 may be an MMT data string transmitted via a broadcast transmission path and demodulated by the tuner / demodulator 131, or an MMT data string transmitted via a communication line and received by the LAN communication unit 121. The demultiplexer 132 also plays back multimedia applications and their component file-based data, temporarily storing them in the cache unit 152. The demultiplexer 132 also extracts general-purpose data and outputs it to the data decoder 151 for use in streaming data for a player or application that presents data other than video, audio, and subtitles. The demultiplexer 132 may also perform error correction and access restriction control on the input MMT data string under the control of the main control unit 101.

[0136] Video decoder 141 decodes the video data string input from separation unit 132 and outputs video information. Video color gamut conversion unit 142 performs color space conversion processing on the video information decoded by video decoder 141 as necessary for video synthesis processing in video synthesis unit 161. Audio decoder 143 decodes the audio data string input from separation unit 132 and outputs the audio information. Streaming data in, for example, MPEG-DASH (MPEG-Dynamic Adaptive Streaming over HTTP) format acquired from the Internet 200 via LAN communication unit 121 may also be input to video decoder 141 and audio decoder 143. A plurality of video decoders 141, video color gamut conversion units 142, audio decoders 143, etc. may be provided in order to simultaneously decode and process multiple types of video data strings and audio data strings.

[0137] The superimpose decoder 144 decodes the superimpose data string input from the separation unit 132 and outputs superimpose information. The subtitle decoder 145 decodes the subtitle data string input from the separation unit 132 and outputs subtitle information. The superimpose information output from the superimpose decoder 144 and the subtitle information output from the subtitle decoder 145 are combined in the subtitle composition unit 146, and further, in the subtitle color gamut conversion unit 147, color space conversion is performed as necessary for the video composition process in the video composition unit 161. Note that in this embodiment, of the services that mainly consist of 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 other services are referred to as superimposes. Furthermore, when there is no need to distinguish between them, they are collectively referred to as subtitles.

[0138] Browser unit 154 presents multimedia application files and their constituent file data obtained from a server device on Internet 200 via cache unit 152 or LAN communication unit 121, in accordance with instructions from application control unit 153, which interprets control information included in an MMT data string and control information obtained from a server device on Internet 200 via LAN communication unit 121. The multimedia application files may be HTML (Hyper Text Markup Language) documents, BML (Broadcast Markup Language) documents, etc. The application information output from browser unit 154 is further subjected to color space conversion processing as necessary in application color gamut conversion unit 155 for video synthesis processing in video synthesis unit 161. Browser unit 154 also plays application audio information by instructing sound source unit 156.

[0139] 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 other information, and performs appropriate processing such as selection and / or superimposition. The video synthesis unit 161 includes a video RAM (not shown), and drives the monitor unit 162 and other units based on the video information and other information input to the video RAM. Furthermore, under the control of the main control unit 101, the video synthesis unit 161 performs scaling processing and superimposition processing of EPG (Electronic Program Guide) screen information created based on information such as the MH-EIT included in the MMT-SI, as necessary. The monitor unit 162 is 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.

[0140] The presentation function of the broadcast receiving device 100 of this embodiment is assumed to have a logical plane structure to display multimedia services as intended by the provider. FIG. 7B shows an example of the logical plane structure of the presentation function of the broadcast receiving device 100 of this embodiment. In this logical plane structure, a subtitle plane for displaying subtitles is placed in the foreground, and a subtitle plane for displaying subtitles is placed in the next layer. A multimedia plane for displaying broadcast video, multimedia applications, or composite video thereof is placed in the third layer, and a background plane is placed in the background. The subtitle synthesis unit 146 and the video synthesis unit 161 draw subtitle information on the subtitle plane, subtitle information on the subtitle plane, and video information, application information, etc. on the multimedia plane. 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 multiple third-layer multimedia planes can be prepared depending on the number of video decoders 141. However, even if multiple multimedia planes are present, application information, etc. output from the application color gamut conversion unit 155 is output only to the foreground multimedia plane.

[0141] 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 that has been 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 that has been selected and / or mixed by the audio synthesis unit 164.

[0142] 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 external video / audio output devices, outputs analog video signals / audio signals to external video / audio input devices, 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.

[0143] 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 directly outputting an MMT data string obtained by demodulation in the tuner / demodulation unit 131, an MMT data string acquired via the LAN communication unit 121, or mixed data of the above-mentioned MMT data strings. The digital interface unit 125 may also be controlled so that the MMT data string input from the digital interface unit 125 is input to the separation unit 132. The output of digital content stored in the storage (accumulation) unit 110 or the storage of digital content in the storage (accumulation) unit 110 may be performed via the digital interface unit 125.

[0144] 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 also output or input data in the form of serial data conforming to the IEEE 1394 specification, or the like. It may also be configured as an IP interface which outputs digital interface data 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.

[0145] 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 provided. The operation input unit 170 may also be replaced by a touch panel placed on top of the monitor unit 162. It may also be replaced by a keyboard or the like connected to the extension 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.

[0146] 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. Furthermore, the broadcast receiving device 100 may be a television receiver, an optical disk drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disk drive recorder such as an HDD recorder, a set-top box (STB), or the like. It may also be a personal computer (PC), tablet terminal, navigation device, game console, or the like equipped with a digital broadcast receiving function and a broadcast / communication linkage function. When the broadcast receiving device 100 is a DVD recorder, HDD recorder, STB, or the like, the monitor unit 162 and the speaker unit 165 may not be provided. Connecting an external monitor and external speaker to the video output unit 163 and the audio output unit 166 or the digital interface unit 125 enables the broadcast receiving device 100 to operate in the same manner as the broadcast receiving device 100 of this embodiment.

[0147] [System configuration for clock synchronization / presentation synchronization of broadcast receiving devices] FIG. 7C shows an example of a system configuration for clock synchronization / presentation synchronization in a broadcasting system compatible with the broadcast receiving device 100 of this embodiment. In this broadcasting system, UTC is transmitted from the broadcast transmission system to the receiver (such as the broadcast receiving device 100 of this embodiment) in a 64-bit NTP timestamp format. In this NTP timestamp format, UTC "seconds or more" are represented by 32 bits, and "less than a second" is represented by 32 bits. However, in practice, it is difficult to reproduce one second with 32-bit precision. For this reason, a system clock for synchronizing a video system or for operating an NTP-formatted clock may have a frequency of, for example, 2 to the 24th power Hz (approximately 16.8 MHz), as shown in the figure. Note that, considering that the system clock in conventional broadcasting systems was 27 MHz and the ease of constructing a receiver hardware configuration, it is desirable to use a frequency that is a power of 2, such as 2 to the 28th power, as the system clock.

[0148] In addition, when the system clock on the broadcast transmission system side or the receiver side is set to a frequency of a power of 2, such as "2 to the 24th power" to "2 to the 28th power," as described above, the lowest 8 to 4 bits of 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 nth power" Hz (n=24 in the example of FIG. 7C), the lowest "32-n" bits of the NTP timestamp format may be fixed to "0" or "1." Alternatively, the receiver side may process the lowest "32-n" bits of the NTP timestamp format to be ignored.

[0149] When the broadcast transmission system receives NTP-formatted time information from an external source, it configures a PLL system with a 32+n-bit counter using a 2n-Hz VCO (Voltage Controlled Oscillator) to create a transmission system clock that synchronizes with the externally provided time information. The entire signal processing system operates in synchronization with the 2n-Hz system clock. Furthermore, the output of the transmission system clock is periodically transmitted to the receiver via the broadcast transmission path as NTP-formatted time information.

[0150] The receiver receives time information in NTP format via the broadcast transmission path and, like the broadcast transmission system, regenerates the receiving system clock using a PLL system based on a 2 to the nth power VCO. This synchronizes the receiving system clock with the broadcast transmission system. Furthermore, by operating the receiver's signal processing system in synchronization with the 2 to the nth power system clock, clock synchronization between the broadcast transmission system and the receiver is achieved, enabling stable signal playback. The broadcast transmission system sets the decoding time and presentation time for each presentation unit of the video / audio signal based on the NTP format time information. The MPT stored in the PA message transmitted in the broadcast signal contains the MPU timestamp descriptor shown in Figure 13B (described later). The "mpu_sequence_number" parameter in the MPU timestamp descriptor in Figure 13B indicates the sequence number of the MPU describing the timestamp, and the "mpu_presentation_time" parameter indicates the MPU presentation time 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.

[0151] Note that, when focusing on the control of the decoding timing and presentation timing for each presentation unit of the aforementioned video / audio signals, etc., 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). 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."

[0152] [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, RAM 104, and 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 when accessing external mobile terminal devices and each server device, and various information storage areas for storing various other information.

[0153] The basic operation program 1001 stored in the ROM 103 is loaded into the RAM 104, and the main control unit 101 executes the loaded basic operation program to form a basic operation execution unit 1101. Similarly, the receiving function program 1002 stored in the storage (accumulation) unit 110 is loaded into the RAM 104, and the main control unit 101 executes the loaded receiving function program to form a receiving function execution unit 1102. The RAM 104 also includes a temporary storage area for temporarily storing data created when each operation program is executed, as needed.

[0154] For ease of explanation, 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 below as if the basic operation execution unit 1101 controls each operation block. Similar descriptions will be used for the other operation programs.

[0155] The reception function execution unit 1102 controls each operational block of the broadcast receiving device 100 to play back components such as video and audio transmitted in the broadcast 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 stream, audio data stream, etc. separated from the MMT data stream to the corresponding decoding processing units. The AV decoding processing unit 1102b mainly controls the video decoder 141, audio decoder 143, etc. The application processing unit 1102c mainly controls the cache unit 152, application control unit 153, browser unit 154, and sound source unit 156. The superimposition processing unit 1102d mainly controls the superimposition decoder 144. The subtitle processing unit 1102e mainly controls the subtitle decoder 151. 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 and generates 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.

[0156] The operation programs may be stored in the ROM 103 and / or the storage unit 110 before shipping the product. After shipping the product, the operation programs may be acquired from another application server 500 or the like on the Internet 200 via the LAN communication unit 121. Alternatively, 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.

[0157] [Broadcasting station 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.

[0158] 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 within the broadcast station server 300. The RAM 304 serves as a work area when each operation program is executed.

[0159] The storage unit 310 stores a basic operation program 3001, a broadcast content management / distribution program 3002, and a broadcast content transmission 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 for each broadcast program broadcast by a broadcast station. The metadata storage area 3300 stores metadata for each broadcast program, such as the program title, program ID, program summary, cast, broadcast date and time, and copy control information for each program content.

[0160] In addition, the basic operation program 3001, broadcast content management / distribution program 3002, and broadcast content sending 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 sending execution unit 3103.

[0161] For ease of explanation, the process of controlling each operation block by the main control unit 301 expanding the basic operation program 3001 stored in the storage unit 310 into the RAM 304 and executing it will be described below as if the basic operation execution unit 3101 were to control each operation block. Similar descriptions will be used for the other operation programs.

[0162] The broadcast content management / distribution execution unit 3102 manages the program content and 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 content and metadata of each broadcast program to the service provider based on a contract. Furthermore, when providing the program content and 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.

[0163] The broadcast content transmission execution unit 3103 performs time schedule management when transmitting the program content of the broadcast program stored in the broadcast content storage area 3200 and the MMT data string including the program title, program ID, copy control information of the program content, etc. of the broadcast program stored in the metadata storage area 3300 from the radio tower 300t via the digital broadcast signal transmission unit 360.

[0164] The LAN communication unit 321 is connected to the Internet 200 and communicates with the service provider server 400 and the like on the Internet 200. 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 made up of video data sequences, audio data sequences, program information data sequences, etc. of the program content 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.

[0165] [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 made up of a main control unit 401, a system bus 402, a RAM 404, a storage unit 410, and a LAN communication unit 421.

[0166] 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.

[0167] 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 program content of broadcast programs provided by the broadcast station server 300 as video content. It also stores video content and the like produced by the service provider. The metadata storage area 4300 stores various metadata provided by the broadcast station server 300 and metadata related to video content produced by the service provider. The application storage area 4400 stores various applications and the like for realizing services linked to broadcast programs, which are distributed in response to requests from each television receiver. The user information storage area 4500 stores information (personal information, authentication information, etc.) related to users who are permitted to access the service provider server 400.

[0168] 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.

[0169] For ease of explanation, the process of the main control unit 401 controlling each operation block by loading the basic operation program 4001 stored in the storage unit 410 into the RAM 404 and executing it will be described below as if the basic operation execution unit 4101 were to control each operation block. Similar descriptions will be used for the other operation programs.

[0170] The video content management / distribution execution unit 4102 acquires program content and metadata of broadcast programs from the broadcast station server 300, manages the video content and metadata stored in the video content storage area 4200 and the metadata storage area 4300, and controls the distribution of the video content and metadata to each television receiver. Furthermore, the video content management / distribution execution unit 4102 may perform authentication processing for each television receiver as needed when distributing the video content 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 for each television receiver as needed when distributing the application to each television receiver.

[0171] 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 is assumed to include an encoding circuit, a decoding circuit, and the like.

[0172] [Hardware configuration of mobile information terminal] 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.

[0173] 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 within the portable information terminal 700.

[0174] The 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. The RAM 704 serves as a work area when the basic operation programs and other operation programs are executed. The ROM 703 and RAM 704 may be integrated with the main control unit 701. Furthermore, the ROM 703 may not be an independent configuration as shown in FIG. 10A, but may use a partial storage area within the storage unit 710.

[0175] The storage unit 710 stores the operation programs and operation setting values ​​of the portable information terminal 700, personal information of the user of the portable 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 moving images, still images, and audio downloaded via the Internet 200. A portion of the storage unit 710 may replace all or part of the functions of the ROM 703. The storage unit 710 must also retain the stored information even when power is not being supplied to the portable information terminal 700 from an external source. Therefore, for example, a device such as a nonvolatile semiconductor memory such as a flash ROM or SSD, or a magnetic disk drive such as an HDD, is used.

[0176] It should be noted that the operation programs stored in the ROM 703 and storage unit 710 can be added, updated, and have their functions expanded by downloading from each server device on the Internet 200 .

[0177] 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 wireless, such as Wi-Fi (registered trademark). The mobile telephone network communication unit 722 performs telephone communication (calls) and data transmission and reception via wireless communication with a base station 600b of the mobile telephone network. The NFC communication unit 723 performs wireless communication when in proximity to a compatible 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, etc. The communication processing unit 720 may further include other communication units, such as a Bluetooth (registered trademark) communication unit or an infrared communication unit.

[0178] The expansion interface unit 724 is a group of interfaces for expanding the functions of the mobile information terminal 700, and in this embodiment is configured with a video / audio interface, a USB interface, a memory interface, etc. The video / audio interface inputs video signals / audio signals from external video / audio output devices, outputs video signals / audio signals to external video / audio input devices, 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.

[0179] 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 with an array of button switches. Only one of these 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 also be provided in the display unit 741.

[0180] 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 functions such as format conversion and superimposition processing of menus and other on-screen display (OSD) signals 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 or object by converting light input from a lens into an electrical signal using electronic devices such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor.

[0181] The audio processing unit 750 is made up 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.

[0182] 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 ambient brightness and the proximity of surrounding objects. The portable information terminal 700 may further include other sensors such as a barometric pressure sensor.

[0183] 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 video, a portable game console, a navigation device, or other portable digital devices.

[0184] 10A includes many components that are not essential to this embodiment, such as sensor unit 760, but the effects of this embodiment are not impaired even if these components are not provided. Furthermore, components not shown, such as a digital broadcast receiving function and an electronic money payment function, may be further added.

[0185] [Software configuration of mobile information terminal] 10B is a software configuration diagram of the mobile information terminal 700 of this embodiment, and shows the software configuration in the ROM 703, RAM 704, and 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 that stores content such as moving images, still images, and audio, an authentication information storage area 7300 that stores authentication information and the like required when accessing a television receiver or each server device, and various information storage areas that store various other information.

[0186] A basic operation program 7001 stored in ROM 703 is loaded into RAM 704, and the main control unit 701 executes the loaded basic operation program to form a basic operation execution unit 7101. Similarly, a cooperative control program 7002 stored in storage unit 710 is loaded into RAM 704, and the main control unit 701 executes the loaded cooperative control program to form a cooperative control execution unit 7102. The RAM 704 also includes a temporary storage area for temporarily storing data created when each operation program is executed, as needed.

[0187] For ease of explanation, the process of controlling each operation block by the main control unit 701 loading the basic operation program 7001 stored in the ROM 703 into the RAM 704 and executing it will be described below as if the basic operation execution unit 7101 were to control each operation block. Similar descriptions will be used for the other operation programs.

[0188] The cooperative control execution unit 7102 manages device authentication and connection, transmission and reception of data, etc. when the mobile information terminal 700 performs cooperative operation with the television receiver. The cooperative control execution unit 7102 also has a browser engine function for executing applications that work in conjunction with the television receiver.

[0189] The operation programs may be stored in the ROM 703 and / or the storage unit 710 before the product is shipped. After the product is shipped, the operation programs may be acquired from another application server 500 or the like on the Internet 200 via the LAN communication unit 721 or the mobile telephone network communication unit 722. Alternatively, the operation programs may be stored in a memory card, an optical disk, or the like and acquired via the extended interface unit 724 or the like.

[0190] [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 using Figure 7C. The second time management function is a time management function based on MH-TOT, and time is managed based on the time information transmitted by MH-TOT, as explained in Figure 6B.

[0191] FIG. 13A shows an example of the structure of time information transmitted by NTP. FIG. 13B shows an example of the data structure of the MPU timestamp descriptor. The "reference_timestamp" parameter and "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" in UTC are represented by 32 bits and "less than a second" by 32 bits. In other words, NTP format time information can transmit time information down to "less than a second." Furthermore, because the NTP format time information is expressed in UTC, it can be consistent with the NTP included in signals received over a communication line path (e.g., a communication line that can be received by the LAN communication unit 121 in FIG. 7A) as shown in FIG. 3B, unlike clock management in conventional digital broadcasting.

[0192] 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 able to obtain the current date and current time from the "JST_time" parameter of the MH-TOT. As shown in FIG. 11B, the "JST_time" parameter includes the lower 16 bits of the coded data of the current date in Modified Julian Date (MJD) and 24 bits of information representing 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 are: two 4-bit binary coded decimal numbers represent the hour in two decimal digits, the next two 4-bit binary coded decimal numbers represent the minute in two decimal digits, and the last two 4-bit binary coded decimal numbers represent the second in two decimal digits.

[0193] Therefore, the difference between time based on NTP and time based on MH-TOT is that the former, NTP, transmits time information in UTC notation, which can transmit time information down to the "second," as mentioned above, while the information transmitted by MH-TOT is information up to the "second" in JST notation.

[0194] 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, to synchronize the decoding and display of the video, audio, subtitles, superimposed text, and other presentation data that are the content of the broadcast signal. Furthermore, by referring to information in UTC rather than the clock notation of the broadcast station, it is also possible to synchronize the decoding and display of the video, audio, subtitles, superimposed text, or other data that are the content of the broadcast signal received by the broadcast signal with the video, audio, subtitles, superimposed text, or other data acquired via a communication line path.

[0195] Furthermore, the broadcast receiving device of this embodiment may use a time management function based on "JST_time," which includes 24-bit information expressed as six 4-bit binary-coded decimal numbers in the MH-TOT, for the process of presenting the current time to a user or for each process that handles the MH-Event Information Table (MH-EIT) described in FIG. 6B. Generally, the process of presenting the current time to a user in a broadcast receiving device rarely requires accuracy down to the second. Furthermore, each piece of time information described in the MH-Event Information Table (MH-EIT) is stored as 24-bit information expressed as six 4-bit binary-coded decimal numbers, each with two decimal digits for "hour," "minute," and "second," similar to the EIT of conventional digital broadcasts transmitted using the MPEG2-TS format. Therefore, the time management function based on the MH-TOT in the broadcast receiving device 100 of this embodiment is easily compatible with processes that use the MH-EIT. Specifically, processes that use the MH-EIT include the program guide generation process (described below), control of recording and viewing reservations, and copyright management processes such as temporary storage. This is because precision of less than a second is rarely required for any of the processes, and precision of one second is sufficient.

[0196] Furthermore, the generation of the program guide, control of recording reservations and viewing reservations, copyright management processes such as temporary storage, etc. are functions that are also installed in receivers of digital broadcasting systems using the conventional MPEG2-TS format. Therefore, if the broadcasting system of this embodiment is configured so that the generation of the program guide, control of recording reservations and viewing reservations, copyright management processes such as temporary storage, etc. can be handled using time management processes that are consistent with those of conventional MPEG2-TS digital broadcasting systems, when configuring a broadcast receiving device that has both the reception function for conventional MPEG2-TS digital broadcasting and the reception function for MMT digital broadcasting, it will no longer be necessary to design separate processing algorithms for these processes (generation of the program guide, control of recording reservations and viewing reservations, copyright management processes such as temporary storage, etc.), thereby reducing costs.

[0197] Furthermore, even in the case of a receiver that 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 possible to develop it at a lower cost because it is possible to reuse the algorithms for functions that are also installed in receivers for digital broadcasting systems using the conventional MPEG2-TS format, without having to create completely new algorithms for processes such as generating program guides, controlling recording and viewing reservations, and copyright management processes such as temporary storage.

[0198] Therefore, by configuring the time management function based on the MH-TOT "JST_time" parameter to be used for these processes (such as generating program guides, controlling recording and viewing reservations, and copyright management processes such as temporary storage), it will be possible to provide even MMT-based digital broadcasting receiving devices at a lower cost by increasing compatibility with conventional broadcasting systems.

[0199] 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 format that is consistent with conventional digital broadcasting systems, and the other type of time information is time information with higher resolution than the first type of time information. By using the latter type of time information for synchronizing each piece of content data in the broadcast signal, more advanced information presentation processing than conventional broadcasting systems is realized, and by using the former type of time information for generating a program guide, controlling recording and viewing reservations, and copyright management processing such as temporary storage, it is possible to provide a broadcast receiving device at low cost.

[0200] 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.

[0201] [First variation of time management] Next, a first modification of the time management in the broadcasting system of this embodiment will be described below.

[0202] In a first variant, in order to improve the accuracy of the management time of the NTP-based time management function already explained using Figure 7C, information regarding the expected delay time in transmitting time information from a time management server (not shown) or broadcast station server 300 to the 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 expected delay time to correct the system clock of the NTP-based time management function.

[0203] In this case, information regarding the expected delay time may be transmitted within a TMCC (Transmission and Multiplexing Configuration Control) area outside the TLV multiplexed stream, rather than within the TLV multiplexed stream shown in FIG. 3(A). Transmission within the TMCC area allows the broadcast receiving device 100 to extract information regarding the expected delay time without undergoing demultiplexing (demuxing) of the TLV multiplexed stream. This allows the broadcast receiving device 100 to acquire information that is less susceptible to delays due to the demultiplexing process, thereby enabling highly accurate system clock adjustment. An example of the data structure of the time information transmitted in the TMCC signal is 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 of ​​FIG. 13C, the “delta” parameter represents the expected 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, expressed as a 32-bit signed fixed-point number. The upper 16 bits describe the integer part, and the lower 16 bits describe the decimal point. 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 describe the integer part, and the lower 32 bits describe the decimal point.

[0204] In the first variant, the broadcast receiving device 100 of this embodiment can correct the system clock of the NTP-based time management function used for synchronizing each content data of the broadcast signal with higher accuracy by using information regarding the expected delay time described in the time information stored in the TMCC extended information area and transmitted (for example, the aforementioned ``delta'' parameter and / or ``transmit_timestamp'' parameter).

[0205] [Second variation of time management] Next, a second modification of the time management in the broadcasting system of this embodiment will be described below.

[0206] 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 the 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.

[0207] However, because the aforementioned "JST_time" parameter uses only the lowest 16 bits of the MJD encoded data, an overflow occurs at "April 22, 2038," and dates after "April 23, 2038" cannot be expressed using only the specified calculation. Therefore, in the second modified example of this embodiment, the calculation method is switched depending on whether the MJD value is equal to or greater than a specified value or less than the specified value, so that dates after "April 23, 2038" can be expressed.

[0208] FIG. 12 shows an example of a first calculation method used when the MJD value is equal to or greater than a predetermined value, and a second calculation method used when the MJD value is less than the predetermined value. For example, if the predetermined value is "32768 (0x8000)," the current date is calculated using the first calculation method when the MJD is equal to or greater than "32768," and the current date is calculated using the second calculation method when the MJD is less than "32768." Note that an MJD less than "32768" is equivalent to the most significant bit of the 16-bit MJD data being "0." This allows the broadcast receiving device 100 of this embodiment to represent dates after "April 23, 2038." However, the predetermined value can be set arbitrarily, such as "16384 (0x4000)" or "49152 (0xC000)." The condition for switching the calculation method may be when the most significant two bits of the 16-bit data of the MJD are "00" or when the most significant two bits of the 16-bit data of the MJD are not "11." Note that if the above-mentioned means is used with the predetermined value set to "32768," it will not be possible to represent dates prior to "September 4, 1948," but this will not pose any particular problem in practical use as a television receiver.

[0209] Alternatively, instead of switching between the first and second calculation methods based on the comparison result between the MJD and the predetermined value, the first and second calculation methods may be switched based on a flag that replaces part or all of the "reserved" parameter in the MH-TOT data structure shown in FIG. 11A or a newly added flag. For example, if the most significant bit of the 16-bit encoded data of the MJD is "0," the flag may be set to "1" if the MJD indicates "April 23, 2038" or later, or set to "0" if the MJD does not indicate "April 23, 2038" or later. Then, if the flag is "1," the second calculation method shown in FIG. 12 may be used, and if 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.

[0210] Furthermore, in the broadcasting system of this embodiment, as described above, absolute time in NTP format is transmitted, and the broadcast receiving device 100 of this embodiment has a time management function based on the NTP. Furthermore, the broadcast receiving device 100 of this embodiment controls the decoding timing and presentation timing for each presentation unit of video / audio signals by referring to the NTP timestamp etc. described in the MPU timestamp descriptor set for each MPU. As described above, the time information in the NTP format has the structure shown in Figure 13A. Furthermore, the MPU timestamp descriptor has the structure shown in Figure 13B.

[0211] 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 depending on 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.

[0212] Either of the above methods makes it possible for the broadcast receiving device 100 of this embodiment to express dates after "April 23, 2038."

[0213] [Broadcast receiver channel selection process (initial scan)] The AMT of the broadcasting system of this embodiment provides a list of multicast groups for IP packets so that IP packets transmitted using the TLV multiplexing method can be received without distinction from IP packets transmitted over a communication line. Multiple IP multicast groups can be listed for one service identifier. Address masks can also be used to efficiently describe consecutive IP addresses.

[0214] In the broadcast receiving device 100 of this embodiment, when a channel scan is performed during initial setup or when a rescan is performed to change the settings, it is possible to store a list of services acquired from the TLV-NIT in a nonvolatile memory such as the ROM 103 or the storage unit 110, and further, it is possible to associate a list of IP multicast groups corresponding to each of the services with each of the services as IP-related information and store it in the nonvolatile memory. By storing the list of services and the IP-related information in a nonvolatile memory and making them available for constant reference, it is no longer necessary to reacquire the TLV-NIT or AMT when switching channels, etc., and it is possible to efficiently acquire broadcast content.

[0215] 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.

[0216] 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 initial frequency value (S101). If the tuner / demodulator unit 131 successfully locks onto the set frequency value (S102: Yes), the receiving function execution unit 1102 then acquires the TLV-NIT from the received signal (S103).

[0217] 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 the TLV stream ID and 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, the list of service IDs, etc., the processes of S105 to S107 are repeated. Next, the receiving 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, the list of service IDs, etc. 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).

[0218] Next, the reception 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 lists of IP multicast groups related to multiple service IDs, the process of S110 is repeated. If there are multiple AMTs each having a list of IP multicast groups related to different service IDs, the processes of S109 to S110 are repeated. Next, the reception 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, the storage unit 110, etc. (updates it when rescanning) (S111).

[0219] 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.

[0220] After completing the process of S111, if the frequency value set in the tuner / demodulator unit 131 is the final frequency value of the channel scan range (S112: Yes), the receiving 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 unit 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 acquired with one TLV-NIT, and if an AMT having a list of IP multicast groups related to the service IDs can be acquired, the processes of S112 to S113 are not necessary.

[0221] Through the above-described series of processes, 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 during 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 this information in non-volatile memory such as ROM 103 or storage unit 110.

[0222] 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 about the table in which the change in the parameter was 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. Alternatively, the user may be notified that a change has been made to the information in the table, and the user may be allowed to select whether or not to perform the rescan.

[0223] [Broadcast receiving device tuning process (channel switching)] FIG. 16 is a diagram showing an example of an operation sequence when selecting a station (switching channels) in the broadcast receiving device 100 of this embodiment.

[0224] When a user operates a remote control or the like (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 desired service (S201). Next, the receiving function execution unit 1102 starts acquiring an AMT from the signal received by the tuner / demodulator unit 131. If the AMT is successfully acquired within a predetermined time (S202: Yes), information regarding a list of IP multicast groups corresponding to the service ID is acquired from the acquired AMT (S204). On the other hand, if the AMT is not successfully acquired within the predetermined time (S202: No), the unit 1102 refers to IP-related information stored in the ROM 103 or the storage unit 110 (S203) to acquire information regarding a list of IP multicast groups corresponding to the service ID (S204). Note that the determination process of S202 may not be performed, and the IP-related information stored in the ROM 103 or the storage unit 110 may always be referenced.

[0225] Next, the reception function execution unit 1102 starts acquiring a 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 an 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 service list stored in the ROM 103, the storage unit 110, etc. is referenced (S206) to acquire distribution system information for acquiring an IP data flow corresponding to the service ID (S207). Note that the service list stored in the ROM 103, the storage unit 110, etc. may always be referenced without performing the determination process of S205. 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.

[0226] In the demultiplexer 132, the transport processor 1102a acquires an MMTP packet whose packet ID is "0" from the input MMT data sequence (S209), and further acquires the MPT contained in the acquired MMTP packet (S210). Next, the transport processor 1102a references the "MMT_package_id_byte" parameter in 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 MPT data structure 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 determines that the MMTP packet whose packet ID is "0" is an MMTP packet containing data of a program corresponding to the service ID, and acquires an MFU based on the information in the acquired MPT (S216).

[0227] 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), the transport processing unit 1102a determines that the MMTP packet with the packet ID of "0" is not an MMTP packet containing program data corresponding to the service ID. In this case, the transport processing unit 1102a acquires a PLT again (S212) and checks the acquired PLT to confirm the packet ID (assumed to be x) of the MMTP packet transmitting the MPT containing the "MMT_package_id_byte" parameter corresponding to the service ID (S213). Furthermore, the transport processing unit 1102a acquires an MMTP packet with the packet ID of "x" from the input MMT data string (S214) and acquires the MPT contained in the acquired MMTP packet (S215). Furthermore, the transport processing unit 1102a acquires an MFU based on the information contained in the acquired MPT (S216).

[0228] It is also possible to always perform the processes of S212 to S215 without performing the processes of S209 to S211. In this case, it is possible to shorten the processing time when the data of the program corresponding to the service ID is stored in an MMTP packet with a packet ID other than "0".

[0229] When the MFU is acquired in the processing 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, audio decoder 143, etc. Next, video / audio decoding processing is performed under the control of the AV decoding processing unit 1102b, and presentation processing is performed under the control of the presentation processing unit 1102h, but since each of these processes is publicly known, detailed explanations will be omitted.

[0230] By the above series of processes, the broadcast receiving device 100 of this embodiment can perform a channel selection (channel switching) operation. In particular, as described with reference to Figures 14 and 16, when a channel scan is performed during initial setup or when a rescan is performed to change settings, a service list and IP-related information are created and stored in a nonvolatile memory such as the ROM 103 or the storage unit 110 so that they can be referenced at any time. When selecting a channel (switching a channel), the service list and IP-related information stored in the nonvolatile memory such as the ROM 103 or the storage unit 110 are referenced, thereby improving the efficiency of the operation when selecting a channel (switching a channel). In other words, compared to when AMT or TLV-NIT is reacquired when selecting a channel (switching a channel), it is possible to shorten the time from the start of channel selection (switching a channel) to the end of channel selection (switching a channel).

[0231] [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.

[0232] In the diagram, the "left_top_pos_x" and "right_down_pos_x" parameters indicate the horizontal positions of the top left and bottom right of the region, respectively, as a percentage of the total number of horizontal pixels, with the left side of the full-screen display being "0" and the right side being "100." The "left_top_pos_y" and "right_down_pos_y" parameters indicate the vertical positions of the top left and bottom right of the region, respectively, as a percentage of the total number of vertical pixels, with the top side of the full-screen display being "0" and the bottom side being "100." The "layer_order" parameter indicates the relative position of the region in the depth direction.

[0233] An example of 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.

[0234] FIG. 19A shows a default layout setting for the broadcast receiving device 100 of this embodiment, in which only one area is set across the entire screen. FIG. 19B shows an example in which the entire screen is divided into three areas, designated "Area 0," "Area 1," and "Area 2." For example, if the number of pixels across the entire screen is 7,680 horizontally and 4,320 vertically, "Area 0" is set to the range (0,0)-(6143,3455) because 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 to the range (6144,0)-(7679,4319), and "Area 2" is set to the range (0,3456)-(6143,4319).

[0235] Fig. 19C shows an example of setting three regions, similar to 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" in the same range as described above, depending on the setting of the "layer_order" parameter. Fig. 19D shows an example of a 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).

[0236] As described above, in the broadcasting system of this embodiment, by using the LCT, it becomes possible to control the screen layout so that multimedia services are displayed on the receiver as intended by the service provider.

[0237] Note that fractions after the decimal point that result when dividing the screen according to the setting values ​​of parameters such as "left_top_pos_x" can be rounded up or down. Rounding (or rounding to the nearest integer in binary) is also acceptable. For example, if the total number of pixels on the screen is 7680 pixels x 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" can be set to the range (0,0)-(3916,2203) by rounding up, or to the range (0,0)-(3915,2202) by rounding down. Furthermore, taking into account macroblocks during video compression processing, rounding up or down in 8-pixel or 16-pixel units can be used. This process makes it possible to efficiently set regions based on the LCT and to efficiently convert the resolution of multimedia content in the regions.

[0238] [Exception handling for screen layout control on broadcast receiving devices] In the broadcast receiving device 100 of this embodiment, even if the screen layout area control is performed by the above-mentioned LCT, if the user instructs to display an EPG screen, etc., it is possible to perform screen layout control that ignores the contents of the LCT as an exceptional process. Figure 20A shows an example of the operation of exceptional process of screen layout control based on the LCT.

[0239] 19B is performed by the description in the LCT, and when a broadcast program video is displayed in "Area 0" and broadcast content such as program linked data linked to the broadcast program is displayed in "Area 1" and "Area 2," if the user instructs the display of an EPG screen using a remote control (not shown), the broadcast receiving device 100 of this embodiment will return the screen layout setting to the default setting (i.e., a state in which the same screen layout control as in FIG. 19A is being performed) regardless of the description content of the LCT, as shown in Fig. 20A(A), and control will be performed so that the EPG screen is displayed on the entire screen. Furthermore, if the user instructs the display of the EPG screen to end, the screen layout control will be re-executed in accordance with the description content of the LCT.

[0240] By performing the above-described 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).

[0241] It should be noted that the 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 dual-screen of various setting screens (recording setting screen in the illustrated example) of the broadcast receiving device 100, as shown in FIG. 20B.

[0242] In the case of the recording setting screen shown in FIG. 1A, the display area of ​​the broadcast content changes 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 changes from the entire screen to only the split-screen portion at the left middle of the screen. In either case, the display area for displaying the broadcast content is narrower than when the entire screen is used, so maintaining the area control of the screen layout within the display area (i.e., dividing the area and displaying multiple broadcast contents simultaneously) is not desirable from a visual standpoint. 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 it is also possible to select and display broadcast content in "Area 1" or "Area 2" depending on the immediately preceding area selection status.

[0243] By performing the above-described control, it is possible to improve the ease of viewing the broadcast content compared to when various broadcast content is displayed while maintaining the area control of the screen layout. The same is true when displaying a sub-screen on the recorded program list screen, displaying internet content in a browser, etc.

[0244] [EPG display on broadcast receiver] In the broadcasting system of this embodiment, time-series information about events (so-called programs) included in each service constituting the broadcasting network is transmitted using an MH-EIT. Figure 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 about the current / next event of its own TLV stream and schedule information for each event of its own TLV stream. The broadcast receiving device 100 of this embodiment refers to the MH-EIT and performs identification by service ID (corresponding to the "service_id" parameter in the figure), thereby acquiring information such as the start time and broadcast time of each event and creating an EPG screen. The video synthesis unit 161 is capable of superimposing the created EPG on video information and the like and displaying it on the monitor unit 162.

[0245] 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 format with the vertical axis representing time and the horizontal axis representing service ID (channel), and displays detailed information about broadcast programs broadcast on each channel in each time slot. The detailed information 162a1 about each broadcast program is mainly composed of a title area 162a2 and a detailed description area 162a3.

[0246] The title area 162a2 displays the program title of the broadcast program and symbols or the like representing the attributes of the broadcast program. The symbols or the like representing the attributes of the broadcast program include, for example, symbols / characters indicating that the program is a new program or a rebroadcast program. Alternatively, the symbols or the like may be a symbolized symbol of "data," indicating that the program is compatible with data broadcasting by a broadcast service. Furthermore, the symbols or the like may be a symbolized symbol of "NetWork," such as the symbol 162a4, indicating that content, applications, or the like related to the broadcast program can be obtained from a network. The symbols or the like representing the attributes of the broadcast program may be replaced by using a different background color for the detailed information 162a1 or by surrounding the display area of ​​the detailed information 162a1 with a bold frame.

[0247] Furthermore, 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 the 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 mark 162a4 symbolizing ``NetWork'' etc. may be controlled not to be displayed.

[0248] Furthermore, if the broadcast program is a distributed program distributed via the Internet 200 and cannot be acquired solely from broadcast waves, and further, as described above, if the broadcast receiving device 100 is unable to access each server device on the network, the detailed information 162b1 displayed on the EPG screen 162b may be grayed out, as shown in FIG. 22B . That is, the detailed information of the unavailable distributed program is not displayed. Alternatively, the graying out process may be performed by differentiating the background color of the detailed information 162b1 from the others. When the detailed information 162b1 is selected by operating a remote control (not shown), a pop-up or other notification may be displayed to the user to inform them that the broadcast receiving device 100 is unable to access each server device on the network or that the distributed program associated with the detailed information 162b1 is unavailable for viewing.

[0249] Through the above-described controls, the broadcast receiving device 100 can provide the program information of each broadcast program in a format that is more natural to the user, depending on the network connection status.

[0250] 22C is a diagram showing another example of an EPG screen in the broadcast receiving device 100 of this embodiment. In the figure, "M1 TV," "M2 Broadcast," "M3 Channel," "M4 TV," "TV M5," etc. are the names of the broadcast stations of each channel, and in particular, the "M2 Broadcast" station simultaneously provides broadcast programs distributed by airwaves and distributed programs distributed via the Internet 200 (slot information 162c1 indicated by "Internet Broadcast" in the figure).

[0251] 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 so that information for the "M2 Broadcast (Internet Broadcast)" channel (information 162c1 in figure (A)) that only has programs distributed via the Internet 200 is not displayed, as shown in EPG screen 162d in figure (B).

[0252] By performing the above-described controls, the user of the broadcast receiving device 100 can eliminate the need to check information about channels that the user cannot view.

[0253] [Emergency warning broadcast display on broadcast receiver] The broadcast receiving device 100 of this embodiment is capable of receiving emergency alert broadcasts 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."

[0254] 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 , if a user is watching a regular broadcast program and a program screen 162e of the broadcast program is displayed on the monitor unit 162 when an emergency alert broadcast is received, text information 162e1 from the emergency alert broadcast is superimposed on the program screen 162e. Similarly, if a user instructs the display of an EPG screen and an EPG screen 162f is displayed on the monitor unit 162 when an emergency alert broadcast is received, control is performed to display text information 162f1 from the emergency alert broadcast superimposed on the EPG screen 162f.

[0255] By the above-described 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 has selected and displayed an EPG screen, various setting screens, a recorded program list screen, an Internet browser, etc. This control may also be performed on text information in ordinary superimposed text that is not based on emergency alert broadcasts.

[0256] [Various exception handling] If the broadcast receiving device 100 of this embodiment cannot acquire data outside the TLV stream in the same package, it may perform, for example, the following exception processing.

[0257] As described in FIG. 6E, in the broadcast system supported by the broadcast receiving device 100 of this embodiment, data acquired within a TLV stream and data acquired via 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, data transmission paths other than the TLV stream indicated by the location information (e.g., IPv4 data flow, IPv6 data flow, broadcast MPEG2-TS, etc.) are reception functions separate from the TLV / MMT stream reception function. Therefore, even when the broadcast receiving device 100 is operating, there may be situations in which data cannot be acquired from these transmission paths, such as when the reception functions of these transmission paths are not operating, when the reception functions themselves are operating but relay devices or the like are not operating, when these transmission paths are not connected via wired or wireless connection, or when the broadcast receiving device 100 is installed in an environment where these transmission paths cannot be connected in the first place.

[0258] 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.

[0259] For example, in a case where the LCT defines multiple regions within the screen as shown in Figures 19B and 19C, and the video contained in the TLV stream is displayed in "Area 0," and data acquired via a transmission path other than the TLV stream is displayed in "Area 1" and "Area 2," and data from a transmission path other than the TLV stream that should be displayed in "Area 1" or "Area 2" cannot be acquired, the layout display of the multiple regions specified by the LCT may be prohibited. Specifically, even when the LCT is received, the video of the content received in the TLV stream may remain displayed in "Area 0" of the default layout display shown in Figure 19A, and a transition to a layout display of the multiple regions as shown in Figures 19B and 19C may be prevented. Furthermore, even if an instruction to change from the default layout to the layout indicated by the LCT is input to the operation input unit 170 of Figure 7A in this state, the default layout display shown in Figure 19A may remain or may be switched to another data broadcasting screen, preventing a transition to a layout display of the multiple regions as shown in Figures 19B and 19C.

[0260] In a case where the LCT sets multiple regions on the screen as shown in Figures 19B and 19C, and the video contained in the TLV stream is displayed in "Area 0," and data acquired via a transmission path other than the TLV stream is displayed in "Area 1" and "Area 2," and data from a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2" cannot be acquired, another example of operation when the display frames of the multiple regions shown in Figures 19B and 19C indicated by the LCT are temporarily displayed, and a background color or a predetermined still image is displayed in "Area 1" or "Area 2." If data from a transmission path other than the TLV stream indicated by the MPT location information cannot be acquired after a predetermined time has elapsed, the display may be switched back to the default layout display state shown in Figure 19A. In this case, it is preferable to continue displaying the program video contained in the TLV stream in "Area 0" even when the layout of Figures 19A, 19B, and 19C is changed, because the user's program video itself will continue to be displayed.

[0261] Furthermore, 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 acquire data of a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2," the broadcast receiving device 100 of this embodiment may enter a state where data of a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2" can be acquired due to the start of operation of various communication functions and various reception functions, or changes in the communication environment or communication status of the various communication functions or the reception environment or reception status of the various reception functions. 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 multi-area layout shown in Fig. 19B or 19C indicated by the LCT, and may switch to display the video of the content received in the TLV stream in "Area 0," and display data acquired 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 from the default layout to the layout indicated by the LCT is input from the operation input unit 170.

[0262] [Copyright protection function] In a digital broadcasting system compatible with the broadcast receiving device 100 of this embodiment, by transmitting copy control information included in the MPT, the copy control information may be configured to transmit information indicating the copy control status of the content referenced by the MPT, such as "unlimited copying permitted" (which may be divided into two types: "unlimited copying permitted with encryption required for storage and output" and "unlimited copying permitted with encryption not required for storage and output"), "one generation copying permitted," "a specified number of copies permitted" (for example, "10 copies permitted" if nine copies and one move are permitted), or "copy prohibited." 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, and the like, in accordance with the copy control information. Note that the storage process may not only be performed on the storage (storage) unit 110 within the broadcast receiving device 100, but may also include recordings that have been protected by encryption or other means so that they can only be played on 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.

[0263] A specific example of processing based on the copy control information will be described below.

[0264] First, when the copy control information included in the MPT indicates "unlimited copying," the broadcast receiving device 100 of this embodiment may store in the storage unit 110, record on a removable recording medium, output to an external device, copy to an external device, and move to an external device without any restrictions. However, when there is a distinction between "unlimited copying and encryption processing required for storage and output" and "unlimited copying and no encryption processing required for storage and output," in the case of "unlimited copying and encryption processing required for storage and output," storage in the storage unit 110, recording on a removable recording medium, output to an external device, copy to an external device, and move to an external device may be performed an unlimited number of times, but encryption processing is required for all of them.

[0265] Furthermore, if the copy control information included in the MPT indicates "copyable for one generation only," the broadcast receiving device 100 of this embodiment allows the content to be encrypted and stored in the storage (accumulation) unit 110, but when outputting the stored content to an external device for viewing, the content is encrypted and output together with copy control information indicating "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 the content, etc.) is allowed.

[0266] Furthermore, if the copy control information included in the MPT indicates "copyable a predetermined number of times," the broadcast receiving device 100 of this embodiment can encrypt and store the content in the storage unit 110. However, when outputting the stored content to an external device for viewing, the content is encrypted and output together with copy control information indicating "copy prohibited." However, a predetermined number of copies and moves to an external device may be permitted. In the case of the so-called "Dubbing 10" standard, nine copies and one move to an external device may be permitted.

[0267] Furthermore, if 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, if the broadcast receiving device 100 is configured to have a "temporary storage" mode that allows storage in the storage (accumulation) unit 110 for only 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 if the copy control information included in the MPT indicates "copy prohibited." When content whose copy control information included in the MPT indicates "copy prohibited" is output for viewing on an external device, the content is encrypted and output together with the copy control information indicating "copy prohibited."

[0268] 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 or LAN communication unit 121. The copy or move process to the external device described above may be performed via digital I / F unit 125 or LAN communication unit 121 in Fig. 7A.

[0269] According to the process described above, it is possible to realize appropriate content protection in accordance with the copy control information associated with the content.

[0270] Furthermore, copying of content whose copy control information indicates copy restrictions such as "copyable only once," "copyable a specified number of times," or "copying prohibited" to an external device via LAN communication unit 121 may be permitted only if the IP address of the external device that is the destination of the packet transmitted from broadcast receiving device 100 is within the same subnetwork as the IP address of 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 broadcast receiving device 100. Content whose copy control information indicates "unlimited copying permitted but requires encryption processing when stored and output" may also be handled in the same manner.

[0271] Similarly, the process of storing content whose copy control information indicates copy restrictions such as "copyable only for one generation," "copyable a specified number of times," or "copyable an unlimited number of times and requires encryption processing when stored and output" in the storage (accumulation) unit 110 and then moving the content to an external device via the LAN communication unit 121 is only permitted if the IP address of the external device that is the destination of the packet sent 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.

[0272] In principle, video and audio output for viewing of content stored in storage (accumulation) unit 110 of broadcast receiving device 100 is only possible when the IP address of the external device that is the destination of a packet transmitted from broadcast receiving device 100 is within the same subnetwork as the IP address of broadcast receiving device 100, and is prohibited if the IP address of the external device is outside the same subnetwork as the IP address of broadcast receiving device 100. However, if the external device has been connected within the same subnetwork as the IP address of broadcast receiving device 100 within a predetermined period of time and has been registered (paired) as a device that can be viewed even outside the same subnetwork as the IP address of broadcast receiving device 100, the external device may be configured to enable video and audio output for viewing of content stored in storage (accumulation) unit 110 of 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 broadcast receiving device 100. In this case, the video and audio output for viewing is performed after encrypting the content.

[0273] 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.

[0274] Next, as explained in Figure 6E, in the digital broadcasting system supported by the broadcast receiving device 100 of this embodiment, the location information in the MPT ('MMT_general_location_info()' in Figure 17) means that 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.

[0275] 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 in accordance with the copy control information included in the TLV stream, even if the data is obtained via a different path (IPv4, IPv6, MPEG2-TS, URL, etc.) than the data obtained via the TLV stream of the broadcast path. The copy control status of the content specified by this copy control information can be, as mentioned above, "unlimited copying allowed" (which may be divided into two types: "unlimited copying allowed and encryption processing required for storage and output" and "unlimited copying allowed and encryption processing not required for storage and output"), "one generation only," "a specified number of copies allowed" (for example, 9 copies allowed + 1 move allowed is known as "dubbing 10"), "no copying allowed," etc.

[0276] Here, if the data position indicated by the location information includes MPEG2-TS data transmitted in another digital broadcast signal, the MPEG2-TS data is also broadcast in association with copy control information in the other digital broadcast signal. This raises the question of how to control the copy of the MPEG2-TS data in accordance with what information (should it be in accordance with the copy control information included in the TLV / MMT stream or the copy control information included in the MPEG2-TS?).

[0277] In the digital broadcasting system of this embodiment, to solve this problem, the broadcast receiving device 100 may perform one of the following multiple solution operations.

[0278] <Example 1> In the 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.

[0279] 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 "a specified number of copies permitted," then even if the data was acquired via a different path (digital broadcast in MPEG2-TS transmission format) than the data acquired via the TLV stream, copy control may be performed on the data as "one-generation copy permitted." For example, if the copy control status indicated by the copy control information included in the TLV stream is "unlimited copying permitted" and the copy control status indicated by the copy control information included in the MPEG2-TS is "specified number of copies permitted," then copy control may be performed on the data as "unlimited copying permitted" even if the data was acquired via a different path (digital broadcast in MPEG2-TS transmission format) than the data acquired via the TLV stream.

[0280] In this operation, data acquired via a route other than the TLV stream can also be put into a copy state that is desired to be managed in the broadcast system supported by the broadcast receiving device 100 of this embodiment.

[0281] <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 if 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 the data in the storage unit 110 or the like, recording the data on a removable recording medium, or outputting the data from a digital interface.

[0282] In this operation, for data obtained via a route other than the TLV stream, duplication of copy control status 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.

[0283] Furthermore, if the comparison shows that the copy control status indicated by the copy control information contained in the MPEG2-TS is the same as or more lenient than the copy control status indicated by the copy control information contained in the TLV stream, then copy control can be performed on the MPEG2-TS data contained 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 contained in the TLV stream.

[0284] In this operation, for data obtained via a route other than the TLV stream, duplication of copy control status 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.

[0285] In the above explanation, 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 placed is not limited to the MPT. Other than the MPT, the copy control information may be placed 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 in accordance with these.

[0286] According to the present embodiment described above, it is possible to provide a broadcast receiver compatible with MMT digital broadcasting. Example 2

[0287] The following describes a second embodiment of the present invention. The configuration, processing, effects, etc. 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 explanations of common points as much as possible to avoid duplication. The following description also assumes that the broadcast receiving device of this embodiment is a television receiver that supports both the MMT and MPEG2-TS media transport methods.

[0288] [Broadcast receiving device hardware configuration] 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 extension 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.

[0289] 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.

[0290] The first tuner / demodulation unit 831 receives, via an antenna not shown, broadcast waves of a broadcast service that employs MMT as a media transport method, and tunes (selects) to a channel of the service desired by the user under 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 stream, which it outputs to an MMT decoding processing unit 841. The second tuner / demodulation unit 832 receives, via an antenna not shown, broadcast waves of a broadcast service that employs MPEG2-TS as a media transport method, and tunes (selects) to a channel of the service desired by the user under 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 stream, which it outputs to an MPEG2-TS decoding processing unit 842.

[0291] The MMT decoding processing unit 841 receives the MMT data sequence output from the first tuner / demodulation unit 831 and performs separation and decoding processes for real-time presentation elements such as a video data sequence, an audio data sequence, a superimposed text data sequence, and a subtitle data sequence based on a control signal included in the MMT data sequence. The MMT decoding processing unit 841 has functions corresponding to the separation unit 132, the video decoder 141, the video color gamut conversion unit 142, the audio decoder 143, the superimposed text decoder 144, the subtitle decoder 145, the subtitle synthesis unit 146, the subtitle color gamut conversion unit 147, the data decoder 151, the cache unit 152, the application control unit 153, the browser unit 154, the application color gamut conversion unit 155, the sound source unit 156, and the like, in the broadcast receiving device 100 of the first embodiment. The MMT decoding processing unit 841 can perform the various processes described in the first embodiment. Note that the details of the various processes are the same as those described in the first embodiment, and therefore will not be described here.

[0292] The MPEG2-TS decoding processor 842 receives the MPEG2-TS data stream output from the second tuner / demodulator 832, and performs processes such as separation and decoding of real-time presentation elements such as video data streams, audio data streams, superimposed text data streams, and subtitle data streams based on the control signals included in the MPEG2-TS data streams. 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 uses MPEG2-TS as the media transport method, and detailed description thereof will be omitted.

[0293] 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 processing such as appropriate selection and / or superimposition. The video synthesis unit 861 includes a video RAM (not shown), and drives the monitor unit 862 and the like based on the video information and the like input to the video RAM. Furthermore, the video synthesis unit 861 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 processing such as appropriate selection and / or mixing.

[0294] 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 the MMT data string (or a part thereof) and MPEG2-TS data string (or a part thereof) of a program transmitted via a communication line, and outputs them to the MMT decoding processing unit 841 and MPEG2-TS decoding processing unit 842 as appropriate.

[0295] [Time display on broadcast receiving device] In the broadcast receiving device 800 of this embodiment, it is assumed that the current date and current time can be displayed on the EPG screen, various setting screens, etc. Information relating to the current date and current time is transmitted by MH-TOT or the like in broadcast services that employ MMT as the media transport method, and is transmitted by TOT (Time Offset Table) or the like included in SI (Service Information) defined in the MPEG-2 system in broadcast services that employ MPEG2-TS as the media transport method. The broadcast receiving device 800 can acquire the information relating to the current date and current time by referring to the MH-TOT or the TOT.

[0296] In general, when the video synthesis unit 861 mainly selects the video information etc. output from the MMT decoding processing unit 841, the information relating to the current date and time obtained from the MH-TOT is superimposed on the video information etc., and when the video synthesis unit 861 mainly selects the video information etc. output from the MPEG2-TS decoding processing unit 842, the information relating to the current date and time obtained from the TOT is superimposed on the video information etc.

[0297] However, because there are differences in encoding / decoding processes, transmission paths, etc. 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, there is a possibility that inconsistencies may occur, particularly in the current time display, when selecting a broadcast service that employs MMT as the media transport method and a broadcast service that employs MPEG2-TS as the media transport method. For example, as shown in Fig. 25, when switching the screen display from EPG screen 162g displaying channel information for a broadcast service that employs MMT as the media transport method to EPG screen 162h displaying channel information for a broadcast service that employs MPEG2-TS as the media transport method, the current time display switches from current time display 162g1 to current time display 162h1, which causes an inconsistency that may cause the user to feel visually uncomfortable.

[0298] In the broadcast receiving device 800 of this embodiment, in order to prevent the user from experiencing visual discomfort, even when the video synthesis unit 861 mainly selects video information, etc. output from the MMT decoding processing unit 841, control is performed so that information related to the current date and current time obtained from the TOT is superimposed on the video information, etc. In other words, control is performed so that current time information provided by a broadcast service that adopts MPEG2-TS as the media transport method is superimposed on the content of a broadcast service that adopts MMT as the media transport method.

[0299] By performing the above control, the broadcast receiving device 800 of this embodiment always displays the current time information acquired by referring to the TOT when displaying the current time. Therefore, even when switching between a broadcast service that uses MMT as the media transport method and a broadcast service that uses 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.

[0300] 26A 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 broadcast receiving device 800 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 broadcast receiving device 800 is controlled to acquire current time information by referring to the MH-TOT.

[0301] 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 the current time information provided by a broadcast service that uses MMT as the media transport method, in the opposite way to the above control.

[0302] As mentioned above, in either case, whether the current time information provided by a broadcast service that adopts MPEG2-TS as the media transport method is 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 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.

[0303] Furthermore, in both the case of a broadcast service that employs MMT as the media transport method and a broadcast service that employs MPEG2-TS as the media transport method, there is a possibility that the MH-TOT or TOT transmitted by each broadcast service that constitutes the network may contain an error due to a malfunction of the transmitting system, a transmission error, etc. As a countermeasure against the error in the MH-TOT or TOT, the broadcast receiving device 800 of this embodiment has a function to, when it is determined that the MH-TOT or TOT acquired from the service being received contains an error, acquire the MH-TOT or TOT from another broadcast service on the same network or from an arbitrary broadcast service on another network and refer to the current time information to update the time information of the built-in clock.

[0304] 26B shows an example of the update process of the current time information when receiving a broadcast service that uses MPEG2-TS as the media transport method in the broadcast receiving device 800 of this embodiment. Note that even when receiving a broadcast service that uses MMT as the media transport method, the same process as shown in the figure is possible.

[0305] When updating the time information of the built-in clock in the broadcast receiving device 800 of this embodiment, the receiving function execution unit 1102 first acquires the TOT from the MPEG2-TS data string of the currently received broadcast service (a broadcast service that uses MPEG2-TS as the media transport method) (S301), and then acquires current time information by referring to the acquired TOT (S302). Next, the receiving function execution unit 1102 performs a process of comparing the current time information acquired in the process of S302 with the time information of the built-in clock.

[0306] If the result of the comparison process shows that the difference between the current time information acquired in the process of S302 and the time information of the built-in clock is within a predetermined value (for example, within 3 minutes) (S303: Yes), the receiving function execution unit 1102 updates the time information of the built-in clock with the current time information acquired in the process of S302 (S306).On the other hand, if the result of the comparison process shows that the difference between the current time information acquired in the process of S302 and the time information of the built-in clock is not within a predetermined value (S303: No), or if the TOT acquired in S301 has a flag or the like indicating that there is an error in the data, the receiving function execution unit 1102 acquires a TOT from an MPEG2-TS data sequence of another broadcast service in the same network, or acquires an MH-TOT from an MMT data sequence of an arbitrary broadcast service (a broadcast service that adopts MMT as a media transport method) in another network (S304), and further acquires current time information from the acquired TOT or MH-TOT (S305). The receiving function execution unit 1102 may perform the comparison process of S303 again using the current time information acquired in the process of S305.

[0307] Through the above processing, if the broadcast receiving device 800 of this embodiment determines that the MH-TOT or TOT obtained from the service being received contains an error, it can obtain the MH-TOT or TOT from another broadcast service on the same network or from any broadcast service on another network and refer to the current time information to update the time information of the built-in clock.

[0308] If, during initial setting after shipping from the factory, repeating the steps S304 to S305 fails to acquire current time information whose difference with the time information of the built-in clock falls within a predetermined range, the time information of the built-in clock can be set again using the current time information acquired in the step S302. In this way, it is possible to deal with cases where there is an error in the time information of the built-in clock of the broadcast receiving device 800 of this embodiment.

[0309] [EPG display on broadcast receiver] Event schedule information for broadcast services that use MMT as the media transport method is transmitted using MH-EIT, etc. On the other hand, event schedule information for broadcast services that use MPEG2-TS as the media transport method is transmitted using EIT (Event Information Table) or the like provided in the SI specified in the MPEG-2 system. Therefore, generally, when video information, etc. provided by a broadcast service that uses MMT as the media transport method is displayed, the event schedule information (MH-EIT) for the broadcast service that uses MMT can be acquired, and when video information, etc. provided by a broadcast service that uses MPEG2-TS as the media transport method is displayed, the event schedule information (EIT) for the broadcast service that uses MPEG2-TS can be acquired.

[0310] 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.

[0311] 27A shows an example of an EPG screen in the broadcast receiving device 800 of this embodiment. In the figure, EPG screen 162i is an EPG screen created based on the MH-EIT of a broadcast service that uses MMT as the media transport method, and "M1 TV," "M2 Broadcast," "M3 Channel," "M4 TV," "Television M5," etc. are assumed to be the names of broadcast stations of the broadcast service that uses MMT as the media transport method. Also, EPG screen 162j is an EPG screen created based on the EIT of a broadcast service that uses MPEG2-TS as the media transport method, and "T6 TV," "T7 Broadcast," "T8 Channel," "T9 TV," "Television TA," etc. are assumed to be the names of broadcast stations of the broadcast service that uses MPEG2-TS as the media transport method.

[0312] For example, while a user is watching a broadcast program provided by a broadcast service that employs MMT as a media transport method, if the user operates a remote control (not shown) to instruct the display of an EPG screen, an initial screen (not shown) of the EPG screen 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 about broadcast programs on each channel from 5:00 PM on October 7, 2014 (today) (nearby the current time). Next, if the user wishes to check detailed information about broadcast programs on each channel from 8:00 PM on October 9, 2014, and instructs the remote control (not shown) to update the EPG screen, EPG screen 162i is displayed.

[0313] Furthermore, if the user desires to check detailed information about a broadcast program provided by a broadcast service that employs MPEG2-TS as a media transport method and instructs a network switch by operating a remote control (not shown), an EPG screen 162j is displayed. At this time, the broadcast receiving device 800 of this embodiment is controlled to display detailed information about the broadcast programs on each channel on the same day and in the same time slot (i.e., from 8:00 p.m. on October 9, 2014) as the EPG screen 162i that was displayed immediately before, rather than the initial screen of the EPG screen (i.e., detailed information about the broadcast programs on each channel from 5:00 p.m. on October 7, 2014) created based on the EIT of the broadcast service that employs MPEG2-TS as a media transport method.

[0314] The above control allows the user to easily and continuously check detailed information about broadcast programs broadcast on the same day and at the same time on multiple networks using different media transport methods, thereby improving the usability of the broadcast receiving device 800.

[0315] 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 in which 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 the media transport method and channel information created based on the EIT of a broadcast service that employs MPEG2-TS as the media transport method are seamlessly displayed on the same time axis.

[0316] Therefore, even if a user desires to check channel information created based on the EIT of a broadcast service that uses MPEG2-TS as the media transport method while checking channel information created based on the MH-EIT of a broadcast service that uses MMT as the media transport method, it is not necessary to issue an instruction to switch networks using a remote control (not shown). Furthermore, the user can simultaneously check detailed information about broadcast programs airing 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

[0317] The following describes Example 3 of the present invention. The configuration, effects, etc. of this example are the same as those of Example 1 unless otherwise specified. Therefore, the following mainly describes the differences between this example and Example 1, and omits explanations of common points as much as possible to avoid duplication.

[0318] [System Configuration] 28 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 40100, an antenna 40100a, a connection cable 40200, a monitor device 40300, a broadband network such as the Internet 200, a router device 200r, a broadcast station radio tower 300t, a broadcast satellite (or communication satellite) 300s, a broadcast station server 300, a service provider server 400, and other application servers 500. Although not shown, the system may further include an access point 200a, a mobile telephone communication server 600, a base station 600b of a mobile telephone communication network, and a mobile information terminal 700, connected in the same manner as the system configuration diagram of the broadcast communication system of the first embodiment (see FIG. 1). In this case, the mobile information terminal 700 may be able to communicate directly with the broadcast receiving device 40100 without going through the router device 200r or the like.

[0319] The broadcast receiving device 40100 receives broadcast waves transmitted from a radio tower 300t via a broadcast satellite (or communication satellite) 300s and an antenna 40100a. Alternatively, the broadcast waves transmitted from the radio tower 300t may be received directly from the antenna 40100a without going through the broadcast satellite (or communication satellite) 300s. The broadcast receiving device 40100 can also be connected to the Internet 200 via a router device 200r, and can transmit and receive data via communication with each server device and other communication devices on the Internet 200.

[0320] The connection cable 40200 is a communication cable connecting the broadcast receiving device 40100 and the monitor device 40300, and transmits encoded video / audio data, etc. output from the broadcast receiving device 40100. The monitor device 40300 is a video display device that provides video information and audio information obtained by performing predetermined signal processing on the encoded video / audio data, etc. received via the connection cable 40200 to a user via a display device such as an LCD panel and a speaker. The monitor device 40300 may also be connectable to the Internet 200 via the router device 200r and capable of transmitting and receiving data via communication with each server device or other communication device on the Internet 200. The monitor device 40300 may also be capable of receiving broadcast waves transmitted from a radio tower 300t via an antenna 40300a (not shown).

[0321] [Broadcast receiving device hardware configuration] 29A is a block diagram showing an example of the internal configuration of a broadcast receiving device 40100. The broadcast receiving device 40100 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 40125, 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 character 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 video output unit 163, an audio synthesis unit 164, an audio output unit 166, an operation input unit 170, and a transcode processing unit 40181.

[0322] The broadcast receiving device 40100 of this embodiment is an optical disk drive recorder such as a DVD recorder or a BD recorder, a magnetic disk drive recorder such as an HDD recorder, an STB, etc. That is, compared to the broadcast receiving device 100 of the first embodiment, the monitor unit 162 and the speaker 165 may be omitted.

[0323] The digital interface unit 40125 is an interface that outputs or inputs encoded digital video data and / or digital audio data. The digital interface unit 40125 is capable of directly outputting an MMT data sequence obtained by demodulation by the tuner / demodulator unit 131, an MMT data sequence acquired via the LAN communication unit 121, or mixed data of the MMT data sequences. The digital interface unit 40125 may also be controlled to input the MMT data sequence input from the digital interface unit 40125 to the separator 132. The digital interface unit 40125 may also output digital content stored in the storage unit 110 or store digital content in the storage unit 110. The digital interface unit 40125 may be a DVI terminal, an HDMI (registered trademark) terminal, a DisplayPort (registered trademark) terminal, or the like, and may be controlled to output video data, audio data, and the like output from the video synthesis unit 161 and the audio synthesis unit 164 in a format conforming to the DVI specification, the HDMI specification, the DisplayPort specification, or the like.

[0324] As a modification of the hardware configuration, the functions of the digital interface unit 40125 may be integrated into the LAN communication unit 121. In that case, the various processes of the digital interface unit 40125 described in the following embodiments will be executed by the LAN communication unit 121. Furthermore, the broadcast receiving device 40100 will perform various processes on information acquired from a server on the network via the LAN communication unit 121, and then output digital data to an external device connected to the network via the LAN communication unit 121.

[0325] The transcode processing unit 40181 is a signal processing unit that performs transcode calculations to convert the encoding format, bit rate, media transport system, etc. of each component constituting the content. For example, the transcode processing unit 40181 can convert an MMT data string of broadcast program content including a video component in MPEG-H HEVC format output from the demultiplexing unit 132 into an MPEG2-TS data string of program content including a video component in MPEG-2 or MPEG-4 AVC (Advanced Video Coding) format. It is also possible to perform processing to change only the bit rate without changing the component encoding format or media transport system. The program content that has undergone the transcode calculations can be stored in the storage unit 110 as recorded content or output from the digital interface unit 40125 or the like to be supplied to an external monitor device or the like.

[0326] [Software configuration of broadcast receiving device] FIG. 29B is a software configuration diagram of the broadcast receiving device 40100 of this embodiment, showing the software configuration in the ROM 103, RAM 104, and storage (accumulation) unit 110. Compared to the software configuration diagram of the broadcast receiving device 100 of embodiment 1 (see FIG. 7D), a server function program 41003, a transcoding processing program 41004, and a recording / playback processing program 41005 are added to the storage (accumulation) unit 110. The storage (accumulation) unit 110 also includes a server data storage area 41400 that stores various data (applications, content, other data, etc.) used for services provided to external devices connected via a network. The server data storage area 41400 may be shared with the content storage area 1200.

[0327] The server function program 41003, transcoding processing program 41004, and recording / playback processing program 41005 stored in the storage (accumulation) unit 110 are each expanded into RAM 104, and the main control unit 101 further executes the expanded server function program, transcoding processing program, and recording / playback processing program to form a server function execution unit 41103, transcoding processing execution unit 41104, and recording / playback processing execution unit 41105.

[0328] The server function execution unit 41103 manages various data (applications, content, other data, etc.) stored in the server data storage area 41400, controls the process of distributing the various data in response to requests from external devices, and performs authentication processing for the external devices as necessary. In other words, with the server function execution unit 41103 and the server data storage area 41400, the broadcast receiving device 40100 also has the functionality of a general server device. The transcoding processing execution unit 41104 mainly controls the transcoding calculation processing in the transcoding processing unit 40181. The recording / playback processing execution unit 41105 mainly controls the recording processing of broadcast program content to the content storage area 1200 and the playback processing of recorded content from the content storage area 1200.

[0329] The receiving function execution unit 1102 expanded in the RAM 104 further includes an output control unit 41102i. The output control unit 41102i of the receiving function execution unit 1102 controls each process related to data output from the video output unit 163, the audio output unit 166, and the digital interface unit 40125.

[0330] In the following explanation, an example of a process in which received content is recorded and then played back and output will be described; however, there are cases in which the output content or control information related to that content is changed or rewritten from the time the content is received. This change or rewriting process may be performed when the content is received, recorded, played back, or output. When the content or control information related to that content is changed or rewritten when the content is received, the transcoding process execution unit 41104 may perform this process. When the content or control information related to that content is changed or rewritten when the content is recorded or played back, the transcoding process execution unit 41104 or the recording / playback process execution unit 41105 may perform this process. When the content or control information related to that content is changed or rewritten when the content is output, the transcoding process execution unit 41104 or the output control unit 41102i may perform this process.

[0331] The software configuration shown in FIG. 29B is merely an example, and this embodiment does not necessarily include all of the programs and execution units shown.

[0332] [Interface configuration between broadcast receiving device and monitor device] 30 is a system configuration diagram showing an example of the interface configuration between the broadcast receiving device 40100 and the monitoring device 40300. In this embodiment, a case will be described in which a connection terminal (not shown) of the digital interface unit 40125 on the broadcast receiving device 40100 side and a connection terminal of a digital interface unit (not shown) on the monitoring device 40300 side are connected by a connection cable 40200. Note that the monitoring device 40300 may have the same configuration as the broadcast receiving device 100 shown in FIG. 7A. In this case, the digital interface unit 125 corresponds to the digital interface unit on the monitoring device 40300 side described above, and the connection terminal is connected to the connection cable 40200.

[0333] 30, the connection cable 40200 is configured with n pairs of differential transmission lanes of CH1 to CHn, a DDC (Display Data Channel) line standardized by the VESA (Video Electronics Standard Association), an HPD (Hot Plug Detect) line, a CEC (Consumer Electronics Control) line, and a communication line (TX / RX line in the figure), etc. The differential transmission lanes may also be called differential transmission lines.

[0334] The n pairs of differential transmission lanes may be one pair of clock lanes and (n-1) pairs of data lanes. For example, n=4 and one pair of clock lanes and three pairs of data lanes may be used, or n=2 and one pair of clock lane and one pair of data lane may be used. All of the n pairs of differential transmission lanes may be data lanes that transmit data with a clock superimposed thereon. For example, n=4 and four pairs of data lanes may be used. The clock lanes and data lanes may also be referred to as clock lines and data lines, respectively.

[0335] Digital video (R / G / B / Vsync / Hsync, Y / Pb(Cb) / Pr(Cr), etc.) / audio signals and other control signals may be output in a predetermined format from the video synthesis unit 161 and the audio synthesis unit 164 via the transmission processing unit 40125b of the digital interface unit 40125 on the broadcast receiving device 40100 side. The predetermined format may conform to specifications such as HDMI (registered trademark), and detailed description thereof will be omitted. The digital video / audio signals and other control signals are received by the reception processing unit 40325b of the digital interface unit on the monitor device 40300 side, and are subjected to necessary processing such as image quality adjustment and volume adjustment in the video processing unit and audio processing unit (not shown) as appropriate, and are then output from the display unit and speaker of the monitor device 40300.

[0336] The communication line may be composed of one transmission line and one reception line, or two transmission lines and two reception lines. Alternatively, it may be composed of one transmission / reception line, two transmission / reception lines, or four transmission / reception lines. The one transmission line and one reception line, or the two transmission lines and two reception lines, may be one pair of transmission lines and one pair of reception lines, or two pairs of transmission lines and two pairs of reception lines, respectively, that transmit and receive data by differential transmission. Furthermore, the one transmission / reception line, two transmission / reception lines, or four transmission / reception lines may be one pair of transmission / reception lines, two pairs of transmission / reception lines, or four pairs of transmission / reception lines, respectively, that transmit and receive data by differential transmission. Note that in this embodiment, the "transmission" / "reception" refers to the "transmission" / "reception" as seen from the broadcast receiving device 40100 side.

[0337] The communication line has the same performance / function as the LAN cable connected to the LAN communication unit 121, and the transmission control unit 40125a of the digital interface unit 40125 on the broadcast receiving device 40100 side and the reception control unit 40325a of the digital interface unit on the monitor device 40300 side each have the same network communication function as the LAN communication unit 121. In other words, the communication line of the connection cable 40200 can be considered as a narrow area network to which the broadcast receiving device 40100 and the monitor device 40300 are connected.

[0338] Furthermore, although not shown, the connection cable 40200 may further include a power supply line, a GND line, and a backup line. The n pairs of differential transmission lanes, communication lines, etc. may be shielded by a GND line. All or some of the backup line, DDC line, HPD line, and CEC line may be used as part of the communication line. For example, the backup line and HPD line may constitute one transmission line and one reception line of the communication line, or one pair of transmission and reception lines. The CEC line, etc. may be omitted. The DDC line may be used as an I2C (I-squared-C) communication line between the main control unit 101 of the broadcast receiving device 40100 and a main control unit (not shown) of the monitor device 40300.

[0339] The transmission processing unit 40125b of the digital interface unit 40125 on the broadcast receiving device 40100 side communicates with the reception processing unit 40325b of the digital interface unit on the monitor device 40300 side via the DDC line and is further capable of reading EDID (Extended Display Identification Data) from the EDID storage unit 40325c. That is, the broadcast receiving device 40100 can grasp the display performance of the monitor device 40300 by acquiring the EDID. In this embodiment, the display performance refers to items such as the input resolution and frame rate supported by the monitor device 40300, video standards, whether or not it supports 3D video display, and whether or not it supports network communication via the communication line. In this embodiment, the following description will be given using an example of a process for acquiring the EDID as a means for the broadcast receiving device 40100 to grasp the display performance of the monitor device 40300. However, the acquired information is not limited to EDID. For example, it is possible to acquire performance identification information that is different from EDID and identifies the display performance and functions of the monitor device 40300. Furthermore, it is also possible to grasp the display performance of the monitor device 40300 by means other than acquiring the performance identification information.

[0340] Furthermore, the transmission control unit 40125a of the digital interface unit 40125 on the broadcast receiving device 40100 side controls the transmission processing unit 40125b and is capable of detecting, via the HPD line, that the monitor device 40300 has been connected or that the monitor device 40300 has been powered on. The transmission control unit 40125a of the digital interface unit 40125 on the broadcast receiving device 40100 side is also capable of performing processing such as powering on the monitor device 40300 via the CEC line. The reception control unit 40325a of the digital interface unit on the monitor device 40300 side also controls the reception processing unit 40325b.

[0341] Furthermore, the differential transmission lane may be referred to as a unidirectional transmission signal line that transmits data in only one direction, from the broadcast receiving device 40100 to the monitoring device 40300. Similarly, the DDC line, the CEC line, and the communication line may be referred to as a bidirectional transmission signal line that allows data transmission from the broadcast receiving device 40100 to the monitoring device 40300 and data transmission from the monitoring device 40300 to the broadcast receiving device 40100.

[0342] The configuration of the connection cable 40200, the internal configuration of the digital interface section 40125 of the broadcast receiving device 40100, and the internal configuration of the digital interface section of the monitor device 40300 shown in FIG. 30 are merely examples, and different configurations may be used. Furthermore, the digital interface between the broadcast receiving device 40100 and the monitor device 40300 has been described above as an example of a wired interface using the connection cable 40200, but it may also be configured as a wireless interface.

[0343] [Program recording process] In the MMT broadcasting system of this embodiment, it is possible to transmit each asset constituting a package via multiple paths. For example, as shown in Fig. 31, it is possible to transmit video asset A, audio asset A, and data asset A via an IP data flow transmitted via a broadcast transmission path, and to transmit video asset B, audio asset B, and data asset B via an IP data flow distributed via a communication line. Each of the IP data flows may further include other assets such as subtitle assets and superimposed text assets.

[0344] Furthermore, the package is a series of multiple events, and each of the events corresponds to a so-called "program." The start time, broadcast duration, etc. of each program are specified by the MH-EIT shown in FIG. 21. Furthermore, the asset configuration of each program may be different even if they are programs in the same package. For example, one program may be composed of only video asset A and audio asset A, while another program may be composed of video asset A, audio asset A, audio asset B, and data asset B.

[0345] The broadcast receiving device 40100 of this embodiment is capable of recording programs that do not have copy control information of "copy prohibited" (see [Copyright Protection Function] in the first embodiment) onto the storage (accumulation) unit 110 or an external recording medium connected to the extended interface unit 124. The process of recording a program onto the storage (accumulation) unit 110 or an external recording medium (hereinafter collectively referred to as storage) may also be referred to as a recording process. Note that even if a program has copy control information of "copy prohibited," copying may be allowed as an exception if other control information specifies that temporary storage is permitted.

[0346] The recording process is basically controlled in the same way as the channel selection process described with reference to FIG. 16 , and each asset acquired in the process of S216 is associated with program information that identifies the program to be recorded under the control of the recording / playback process execution unit 41105, and then recorded in storage. Furthermore, each control information by MMT-SI is also appropriately associated with the program information and recorded in storage. The assets may be acquired from an IP data flow included in a TLV stream transmitted via a broadcast transmission path, or from an IP data flow distributed via a communication line, based on the description of the MPT acquired in the process of S210 or S215. The acquisition of the assets from the IP data flow included in a TLV stream transmitted via a broadcast transmission path and recording in storage, and the acquisition of the assets from the IP data flow distributed via a communication line and recording in storage may be performed at the same time or at different times.

[0347] Furthermore, the recording process of each acquired asset to storage may be performed on an asset-by-asset basis, an IP data flow basis, or a package basis. In any case, it is sufficient that the asset is associated with the program information and managed on the storage. The management process may be performed by the recording / playback process execution unit 41105 creating management information for the management and recording it in the content storage area 1200 or various information storage areas of the storage (accumulation) unit 110.

[0348] <Program recording settings> Of the assets constituting a program, those included in IP data flows transmitted via a broadcast transmission path (hereinafter referred to as via-broadcast transmission path assets) can only be acquired while the program is being broadcast. On the other hand, of the assets constituting the program, those included in IP data flows distributed via a communication line (hereinafter referred to as via-communication line assets) may be acquired even when the program is not being broadcast. This is because the via-communication line assets are data stored and distributed in the broadcast station server 300 or the service provider server 400 (hereinafter collectively referred to as the server device). Therefore, unless the via-communication line assets are deleted from the server device, the broadcast receiving device 40100 may be able to acquire the via-communication line assets at any time by accessing the server device via the Internet 200.

[0349] Furthermore, when viewing a program in real time, it is desirable to simultaneously acquire the broadcast transmission path assets and the communication line assets while the program is being broadcast, regardless of whether the program is being recorded. However, when only recording a program is performed and simultaneous viewing is not performed, the broadcast transmission path assets are acquired and recorded in storage while the program is being broadcast. However, this is not necessarily the case for the communication line assets. That is, when recording a program, the communication line assets can be acquired and recorded in storage at a timing different from the broadcast of the program. For example, when recording a program, only the broadcast transmission path assets are acquired and recorded in storage, and the communication line assets are not acquired and recorded in storage. Furthermore, when playing back the program that has been recorded, the communication line assets may be acquired again.

[0350] To perform the above-described control, the broadcast receiving device 40100 of this embodiment allows the user to select, through settings, whether or not to record via-communication-line assets related to a program to be recorded in storage when recording the program. That is, if the user selects to record via-communication-line assets in storage when setting up the program recording process, the broadcast receiving device 40100 acquires both via-broadcast-transmission-path assets and via-communication-line assets and records them in storage when recording the program. Note that the recording processes do not necessarily need to be performed simultaneously. On the other hand, if the user selects not to record via-communication-line assets in storage when setting up the program recording process, the broadcast receiving device 40100 acquires only via-broadcast-transmission-path assets and records them in storage when recording the program.

[0351] The setting of whether or not to record assets via communication lines to storage when recording a program may be set for each program to be recorded, or the same setting may be used for all programs to be recorded. For example, an item for making the selection may be provided on a recording reservation setting screen, or a message prompting the user to make the selection may be displayed upon pressing a "record" key on a remote control or the like. In this way, the setting may be set for each program to be recorded. Also, for example, a setting value for the selection set by menu operation or the like may be stored in ROM 103 or storage (accumulation) unit 110, and control may be performed based on the stored setting value when recording a program. In this way, the same setting may be used for all programs to be recorded.

[0352] FIG. 32A is a screen display diagram showing an example of a recording reservation setting screen in the broadcast receiving device 40100 of this embodiment. If "Record" is selected in the "Communication Asset" item in the figure, recording of the communication line asset to storage is performed when recording the program. Furthermore, if "Do Not Record" is selected in the above item, recording of the communication line asset to storage is not performed when recording the program. Furthermore, if "Record" is selected in the above item, the "Recording Method" item is enabled. If "Only During Program Broadcast" is selected in the "Recording Method" item, recording of the communication line asset to storage is performed only when the program to be recorded is broadcast. If "Also Allowed Outside Program Broadcast" is selected in the above item, recording of the communication line asset to storage may be performed outside the broadcast of the program to be recorded, or may be performed during the broadcast. When performing the above settings using menu operations, etc., a menu configuration such as that shown in FIG. 32B may be used. The names of the above items and menu configurations are merely examples, and different names and menu configurations may be used.

[0353] <Recording processing of assets via communication lines> Next, a process of acquiring a communication line asset and recording it in storage when the user selects to record a communication line asset in storage in the settings of the program recording process will be described.

[0354] Each program in the broadcasting system of this embodiment can be uniquely identified by parameters such as "original_network_id," "tlv_stream_id," "service_id," and "event_id," as shown in the example of the data structure of the MH-EIT in FIG. 21. Furthermore, by referencing the AMT and TLV-NIT using these parameters, information about the TLV stream containing the broadcast transmission path assets that constitute the package of each program can be acquired. Furthermore, by referencing the PLT and MPT included in the TLV stream, information about the IP data flow containing the communication line assets that constitute the package of each program can be acquired. That is, based on the acquired information, the broadcast receiving device 40100 of this embodiment can acquire the broadcast transmission path assets from the IP data flow transmitted in the TLV stream, and can acquire the communication line assets by accessing the server device that is the source of the IP data flow that distributes the communication line assets.

[0355] The broadcast receiving device 40100 of this embodiment can acquire assets via broadcast transmission paths and record them in storage only during the broadcast of the program to be recorded. However, there are three timings when the broadcast of assets via communication lines can be acquired from the server device and recorded in storage: (A-1) before the broadcast of the program to be recorded begins, (A-2) during the broadcast of the program to be recorded, and (A-3) after the broadcast of the program to be recorded ends. However, the acquisition of assets via communication lines from the server device and recording them in storage at timing (A-1) is basically only possible when recording is performed by scheduled recording. On the other hand, the acquisition of assets via communication lines from the server device and recording them in storage at timings (A-2) and (A-3) can be performed both in the case of scheduled recording and in the case of recording instructing a program to be recorded (hereinafter referred to as normal recording).

[0356] Below, an explanation will be given regarding the recording process of the asset via the communication line, which is performed at each of the timings of (A-1), (A-2), and (A-3).

[0357] <A-1: Recording Process of Asset via Communication Line Before Program Broadcast Start> In the case of the recording process by reservation recording, the program to be the target of the recording process has already been selected before the start of the broadcast of the program. That is, in the broadcast receiving apparatus 40100, parameters such as 'original_network_id', 'tlv_stream_id','service_id', 'event_id', etc. of the program to be the target of the recording process are known. Therefore, if the broadcast receiving apparatus 40100 can acquire the source address, etc. of the server apparatus that stores the asset via the communication line of the program to be the target of the recording process by referring to AMT, TLV-NIT, PLT, or MPT using the respective parameters, it may access the server apparatus based on the source address.

[0358] On the other hand, when it is not possible to acquire the source address, etc. of the server apparatus that stores the asset via the communication line of the program to be the target of the recording process because the program to be the target of the recording process is before the start of the broadcast, the broadcast receiving apparatus 40100 may alternatively acquire the source address, etc. of the server apparatus that stores the asset via the communication line of a program having the same parameters such as 'original_network_id','service_id', etc. as the program to be the target of the recording process but having a different 'event_id' from the program to be the target of the recording process. Further, access is made to the server apparatus based on the acquired source address as an alternative. That is, if the respective parameters such as 'original_network_id','service_id', etc. are the same, it is considered likely that the asset via the communication line is stored in the same server apparatus even if the 'event_id' parameter is different.

[0359] In either case, after accessing the server device, if the communication line assets of the program to be recorded can be acquired based on the "event_id" parameter, the communication line assets are acquired and recorded in storage. On the other hand, if the communication line assets of the program to be recorded cannot be acquired, it is determined that the communication line assets of the program to be recorded cannot be acquired and recorded in storage before the program starts airing. In this case, the timing of the acquisition of the communication line assets of the program to be recorded and the recording of the communication line assets in storage may be changed so that they are acquired during the airing of the program to be recorded.

[0360] In addition, in the MH-AIT included in the MMT-SI, the application control code related to the program scheduled to be broadcast on the currently selected channel may be specified as "PREFETCH (acquire and store)" or the like. In this case, even if the program is not scheduled for recording, as an exceptional process, the program's via-communication line assets may be acquired and recorded in storage before the program starts to be broadcast. Note that the via-communication line assets acquired and recorded in storage by the above-mentioned control may be deleted immediately after the program ends, if the program is not scheduled for recording or normal recording. Figure 33A shows an example of the data structure of the MH-AIT. The "application_control_code" parameter in the figure corresponds to the application control code.

[0361] Also, as described above, when the application control code for a program scheduled to be broadcast on the currently selected channel is specified by "PREFETCH (acquire and hold)" or the like, even if the copy control information for the program is specified as "copy prohibited", the acquisition of the program's communication line-based asset and the recording process to the storage may be performed before the start of the broadcast of the program. However, in this case, the recording process to the storage shall be temporary, and it shall be controlled to be deleted or invalidated after the end of the broadcast of the program.

[0362] <A-2: Recording Process of Communication Line-Based Asset During Program Broadcast> The acquisition during broadcast and the recording process to the storage of the communication line-based asset of the program to be recorded are the same in both the case of recording by reservation and the case of recording by normal recording. That is, when it is possible to refer to AMT, TLV-NIT, PLT, or MPT using each parameter such as "original_network_id", "tlv_stream_id", "service_id", "event_id", etc. of the program to be recorded, and to obtain the transmission source address, etc. of the server device that stores the communication line-based asset of the program to be recorded, access is made to the server device based on the transmission source address. Further, the communication line-based asset of the program to be recorded acquired from the server device may be recorded in the storage. Alternatively, the communication line-based asset of the program to be recorded sent in a push format from the server device may be selected and acquired based on the destination address, etc. and recorded in the storage.

[0363] Note that if it is determined during the broadcast of the program to be recorded that it is not possible to acquire the communication line-based asset of the program to be recorded during the broadcast due to insufficient processing capacity due to the multitasking status of the broadcast receiving device 40100 or temporary communication performance degradation due to the network status, the acquisition of the communication line-based asset of the program to be recorded and the recording process to the storage may change the processing timing to be performed after the end of the broadcast of the program to be recorded.

[0364] Also, if the processing capacity and network status of the broadcast receiving apparatus 40100 permit, as an exceptional process, acquisition of an asset via a communication line of a program being viewed without performing a recording process may be performed in advance of the progress of the program and controlled to be temporarily recorded in a storage. In this case, the asset via the communication line recorded in the storage may be controlled to be deleted after the end of the broadcast of the program. In particular, when the copy control information of the program being viewed is specified as 'Copy Prohibited', control is to be performed so that the deletion process of the asset via the communication line is always executed after the end of the broadcast of the program.

[0365] <A-3: Recording Process of Asset via Communication Line after End of Program Broadcast> During the broadcast of a program targeted for a recording process, access to a server device that stores an asset via a communication line of the program targeted for the recording process is expected to be concentrated, making it difficult to acquire the asset via the communication line. The broadcast system of this embodiment enables control based on an MH-probabilistic application delay descriptor in order to avoid the above situation. However, even when control is performed by referring to the descriptor, it cannot be denied that there is still a possibility that it will be difficult to acquire an asset via a communication line of a program targeted for the recording process.

[0366] On the other hand, in the case of scheduled recording, it is highly likely that the program to be recorded will not be viewed during or immediately after the broadcast of the program. Furthermore, in the case of normal recording, if a user selects another channel after issuing a recording instruction and watches a program different from the program for which the recording instruction was issued, it is likely that the program for which the recording instruction was issued will not be viewed simultaneously. In these cases, the broadcast receiving device 40100 of this embodiment is capable of controlling the acquisition of assets via a communication line for the program to be recorded and the recording process to storage to be performed at a predetermined timing after the program has finished airing, rather than during the program's broadcast. The predetermined timing may be a predetermined time after the broadcast of the program to be recorded has finished, or may be a predetermined time. It may also be a timing based on a separate user instruction, or any other arbitrary timing.

[0367] As described above, the acquisition of communication line assets of a program to be recorded and the recording of the communication line assets in storage can be timed after the end of the broadcast of the program only if the communication line assets of the program to be recorded are not deleted from the server device even after the end of the broadcast of the program. Therefore, the broadcast receiving device 40100 of this embodiment first checks information about the time limit for acquiring communication line assets of the program to be recorded from the server device while the program to be recorded is being broadcast, and then, depending on the result of the check, performs control to determine whether to acquire communication line assets and record the communication line assets in storage after the end of the broadcast of the program.

[0368] Figure 33B shows a list of parameters and descriptors placed in the MH-AIT of the broadcasting system of this embodiment. The MH-application expiration date descriptor in the figure is information regarding the period during which assets of each program can be obtained from the server device via a communication line. The names of the descriptors are examples, and different names may be used. Furthermore, the information may be specified by parameters rather than by descriptors.

[0369] If it is confirmed by referring to the MH-application expiration descriptor that the acquisition of communication line assets and the recording of the assets in storage can be performed after the broadcast of the program has ended, the MH-simple application location descriptor is temporarily cached. Furthermore, at a predetermined timing after the broadcast of the program to be recorded has ended, the server device is accessed based on the description in the MH-simple application location descriptor, and the communication line assets of the program are acquired and recorded in storage. The server device may be accessed based on information acquired by referencing the AMT, TLV-NIT, PLT, or MPT using parameters such as the aforementioned "original_network_id," "tlv_stream_id," "service_id," and "event_id." On the other hand, if it is confirmed that the acquisition of communication line assets and the recording of the assets in storage cannot be performed after the broadcast of the program, the processing timing may be changed so that the communication line assets of the program are acquired and recorded in storage while the program to be recorded is still being broadcast.

[0370] In addition, the following describes exceptional processing in the process of acquiring assets via communication lines after the broadcast of a program has ended.

[0371] For example, when setting up a program recording process, a user may select not to record assets via a communication line to storage, and then perform a recording process by scheduled recording or normal recording. In this case, the broadcast receiving device 40100 of this embodiment only acquires the assets via the broadcast transmission path of the program to be recorded and records them in storage, but does not acquire or record the assets via the communication line of the program to storage. In this situation, when a user instructs the broadcast receiving device 40100 to play a recorded program, the broadcast receiving device 40100 reads the assets via the broadcast transmission path of the recorded program from storage and acquires the assets via the communication line of the recorded program from the server device.

[0372] On the other hand, if a deadline for retrieving the communication line assets of the recorded program from the server is specified, once the deadline has passed, even if the user issues a playback instruction for the recorded program, the broadcast receiving device 40100 may be unable to retrieve the communication line assets of the recorded program from the server. To resolve this inconvenience, the broadcast receiving device 40100 of this embodiment has a function to appropriately retrieve the communication line assets of the recorded program from the server device regardless of a user instruction when the deadline for retrieving the communication line assets of the recorded program from the server device approaches.

[0373] Specifically, the content of the MH-application expiration date descriptor associated with each recorded program recorded in the storage is referenced at predetermined time intervals. Furthermore, when the deadline for obtaining the communication line assets of each recorded program from the server device falls within a predetermined period, the server device is accessed to obtain the communication line assets of each recorded program and add them to the storage. Note that the predetermined time interval may be, for example, every 24 hours, 12 hours, or 6 hours. Furthermore, the predetermined period may be within 72 hours, 48 ​​hours, or 24 hours.

[0374] By performing the above-described processing, when the recording process is performed after the user selects not to record communication line assets to storage in the program recording process settings, and further, even if a deadline for retrieving the communication line assets of the recorded program from the server is specified and the deadline has passed, if the user instructs the broadcast receiving device 40100 to play the recorded program, the broadcast receiving device 40100 can read both the broadcast transmission line assets and the communication line assets of the recorded program from storage. In other words, high-quality content playback using both broadcast transmission line assets and communication line assets is possible.

[0375] In the recording processes described in (A-1) to (A-3) above, particularly when recording the communication-line assets of a broadcast program to be recorded at a time other than the broadcast time of the broadcast program, it is effective to include information regarding the time limit for acquiring the communication-line assets in the MH-EIT. Information regarding the time limit for acquiring the communication-line assets can be described, for example, in the MH-EIT for each event (program) as a parameter or descriptor, such as the "start date and time of the period during which the communication-line assets can be acquired" and / or the "end date and time of the period during which the communication-line assets can be acquired." In this way, for example, when performing the process described in (A-1) above, it is possible to easily determine whether the communication-line assets of the broadcast program to be recorded can be acquired by referring to the MH-EIT before the broadcast of the broadcast program to be recorded begins. Similarly, in the processes described in (A-2) and (A-3) above, it is possible to easily determine whether the communication-line assets of the broadcast program to be recorded can be acquired after the broadcast of the broadcast program to be recorded ends by referring to the MH-EIT.

[0376] Furthermore, if the MH-EIT contains information regarding the time limit for acquiring the asset via the communication line, the information may be displayed when the EPG is displayed. For example, in the detailed information 162a1 shown in FIG. 22A, if a symbol 162a4 representing "Network" is displayed in the title area 162a2 and the program contains information regarding the time limit for acquiring the asset via the communication line, a symbol (not shown) representing "Expiration," which indicates that a time limit has been set for acquiring the asset via the communication line from the server device, may be displayed in the title area 162a2. Furthermore, information regarding the time limit for acquiring the asset via the communication line (such as the "start date and time of the period during which the asset via the communication line can be acquired" or the "end date and time of the period during which the asset via the communication line can be acquired") may be displayed in text form in the detailed description area 162a3.

[0377] In this way, by describing information about the time limit for acquiring assets via a communication line in the MH-EIT, recording processing can be performed efficiently in the broadcast receiving device 40100 of this embodiment. Furthermore, in the EPG display, the user can easily grasp information about the time limit for acquiring assets via a communication line.

[0378] [List of recorded programs] FIG. 34 is a screen display diagram showing an example of a recorded program list screen in the broadcast receiving device 40100 of this embodiment. For example, when a remote control capable of operating the broadcast receiving device 40100 is operated to instruct display of a recorded program list, a recorded program list screen 162m as shown in the same figure is displayed. The recorded program list screen 162m displays a list of recorded programs stored in storage. The display format may be in order of recording date and time or program title. Subfolders may also be provided for each channel or series. Information about each recorded program may be composed of a thumbnail section and a program detail information section 162m1. It is also possible to increase the number of recorded programs displayed on the screen without displaying the thumbnail section.

[0379] In this embodiment, the program detailed information section 162m1 may be made up of a program attribute area 162m2, a program basic information area 162m3, and a program extended information area 162m4.

[0380] The program attribute area 162m2 displays symbols and the like representing the attributes of each recorded program. The symbols and the like representing the attributes of each recorded program may include, for example, a symbol representing "Non-viewed," meaning that the program has not been viewed; a symbol representing "Network," meaning that the asset for the recorded program can be acquired from a server; a symbol representing "Obtained," meaning that the asset for the recorded program has already been acquired and recorded in storage; and a symbol representing "Expiration," meaning that a deadline has been set for acquiring the asset for the recorded program from the server. Symbols with other meanings may also be displayed. The display of each of the symbols is controlled depending on the status of each recorded program. Furthermore, each symbol may be replaced with an abbreviation, character, or sentence having the same meaning. The attributes may not normally be displayed in the program attribute area 162m2, but may be displayed as a pop-up only when the recorded program is selected with a selection marker.

[0381] The basic program information area 162m3 displays basic information such as the program title, recording date and time, recording time, recording mode, etc. of each recorded program.

[0382] The program extended information area 162m4 displays information on the period during which the assets of each recorded program can be acquired from the server via a communication line ("Data Acquisition Period" in the figure) if each recorded program has the symbolic mark of "Network" and the symbolic mark of "Expiration", and information on the expiration date of each recorded program ("Data Expiration Period" in the figure) if each recorded program has the symbolic mark of "Obtained". Other information may also be displayed.

[0383] As mentioned above, by displaying marks indicating each of the above-mentioned attributes and information regarding each deadline on the recorded program list screen 162m, the user can easily grasp various information regarding the assets of each recorded program via communication line.

[0384] While the recorded program list screen 162m is displayed, the "cursor" key on the remote control can be used to move the selection marker for each recorded program. Pressing the "confirm" key on the remote control can play the recorded program selected by the selection marker. Pressing the "red" key on the remote control can delete the recorded program selected by the selection marker. Pressing the "yellow" key on the remote control can acquire the communication line asset of the recorded program from the server device if the recorded program selected by the selection marker has a symbolic "Network" mark. The acquisition process executed when the "yellow" key on the remote control is pressed can be considered to be the exceptional process described above in "A-3: Recording process of communication line asset after program broadcasting ends," regardless of the time limit for acquiring the communication line asset from the server device or in response to a user instruction.

[0385] Furthermore, if the recorded program bears the symbol "Network" and the symbol "Expiration," and if the date indicated in the "Data Acquisition Deadline" has passed, the display of the symbol "Network" and the symbol "Expiration" may be erased. This is because acquisition of the recorded program's asset via a communication line becomes impossible due to the expiration date. Furthermore, if the recorded program bears the symbol "Obtained" and the date indicated in the "Data Expiration Date" has passed, the display of the symbol "Obtained" may be erased and the communication line asset of the recorded program stored in storage may be deleted. This is because playback of the recorded program's asset via a communication line becomes impossible due to the expiration date.

[0386] In addition, if the communication line asset of the recorded program, including data that should be displayed in "Area 1" or "Area 2" according to the LCT description in the layout setting shown in Figure 19B, becomes unavailable due to the expiration of the acquisition period from the server device, or if playback processing from storage becomes unavailable due to the expiration of the data expiration period, the broadcast receiving device 40100 of this embodiment controls video display using the default layout setting (i.e., the layout setting shown in Figure 19A) regardless of the description content of the layout setting in the LCT. Video display based on the broadcast transmission path asset is performed in "Area 0" of the default layout setting. This processing may be performed by applying a patch to the layout setting description of the LCT recorded in association with the recorded program each time playback processing of the recorded program is performed. Alternatively, this may be achieved by rewriting the description of the layout setting of the LCT recorded in association with the recorded program, triggered by the fact that the asset of the recorded program via a communication line has become unobtainable because the acquisition period for the asset from the server device has expired, or by the fact that playback processing from storage has become unobtainable because the data expiration date has expired, etc. Also, even if both "Area 1" and "Area 2" are display areas using assets via a communication line and only one of the areas has become unobtainable or unplayable, control may be exercised to patch or rewrite the description of the layout setting of the LCT.

[0387] According to the broadcast receiving device 40100 of the present embodiment described above, it is possible to efficiently acquire assets via a communication line for a program when recording the program. Also, when displaying a list of recorded programs, it is possible to easily notify the user of the acquisition status of assets via a communication line for the program. In other words, it is possible to provide a broadcast receiving device that can execute functions with higher added value.

[0388] Example 4 Hereinafter, Example 4 of the present invention will be described. Note that the configurations, effects, etc. in this example are the same as those in Example 3 unless otherwise specified. Therefore, hereinafter, the differences between this example and Example 3 will be mainly described, and the common points will be omitted as much as possible to avoid duplication. In this example, mainly, data output processing from the broadcast receiving apparatus 40100 to the monitor apparatus 40300 via the connection cable 40200 will be described.

[0389] [Program Output Control] In this example, the broadcast receiving apparatus 40100 is assumed to be an optical disk drive recorder, a magnetic disk drive recorder, a STB, or the like. That is, the broadcast receiving apparatus 40100 does not have a monitor unit for video display and a speaker unit for audio output, and outputs video information (video data) and audio information (audio data) from the digital interface unit 40125, and transmits them to the monitor apparatus 40300 via the connection cable 40200. Further, in the monitor apparatus 40300, the video information is displayed and the audio information is output. Note that in the broadcast receiving apparatus 40100, the output formats of the video information (video data) and the audio information (audio data) to the monitor apparatus 40300 via the connection cable 40200 can be appropriately controlled. Hereinafter, examples of the output formats of the video information (video data) and the audio information (audio data) corresponding to the broadcast receiving apparatus 40100 of this example will be described.

[0390] <B-1: Output 1 of Decoded Video Information and Audio Information> The first example of the output formats of the video information and the audio information corresponding to the broadcast receiving apparatus 40100 is a format in which the decoded video information output from the video synthesizing unit 161 and the decoded audio information output from the audio synthesizing unit 164 are output from the digital interface unit 40125 and transmitted to the monitor apparatus 40300 via the data lane of the connection cable 40200.

[0391] In this first example, when viewing a program currently being broadcast, the broadcast receiving device 40100 acquires each asset included in the IP data flow transmitted via the broadcast transmission path (also referred to as broadcast transmission path via assets in this embodiment) and each asset included in the IP data flow distributed via the communication line (also referred to as communication line via assets in this embodiment), and performs appropriate decoding processing using the video decoder 141, audio decoder 143, superimposed text decoder 144, subtitle decoder 145, data decoder 151, etc. Note that if the communication line via assets have been cached because the application control code is specified as "PREFETCH," the communication line via assets may be acquired by reading them from the cache. Furthermore, the broadcast receiving device 40100 controls the decoded video information and audio information that have been subjected to synthesis processing by the video synthesis unit 161 and audio synthesis unit 164 to be output to the monitor device 40300 via the digital interface unit 40125.

[0392] Furthermore, when viewing a recorded program recorded on the storage (accumulation) unit 110 or an external recording medium (also collectively referred to as storage in this embodiment), the broadcast receiving device 40100 may appropriately decode the broadcast transmission path via assets and communication line via assets read from the storage by the playback process using the video decoder 141, audio decoder 143, superimposed text decoder 144, subtitle decoder 145, data decoder 151, etc. Note that during the playback process, an IP data flow including the communication line via assets may be newly acquired from the broadcast station server 300 or the service provider server 400 (also collectively referred to as server devices in this embodiment). Furthermore, the decoded video information and audio information that have been subjected to the synthesis process in the video synthesis unit 161 and audio synthesis unit 164 are controlled to be output to the monitor device 40300 via the digital interface unit 40125.

[0393] When performing the playback process, it is possible to determine in advance the priority order through menu settings or the like as to which of the communication line - via assets read from the storage and the communication line - via assets included in the IP data flow newly acquired from the server device is to be used for the decoding process. Alternatively, it is also possible to control whether to newly acquire an IP data flow including a communication line - via asset from the server device according to the version information or expiration date information attached to the communication line - via asset read from the storage. Alternatively, it may be left to the user to select each time. For example, first, attempt to acquire an IP data flow including a communication line - via asset from the server device, and use the communication line - via asset read from the storage when the IP data flow including the communication line - via asset cannot be acquired from the server device. Or, first, read the communication line - via asset from the storage, check the version information and expiration date information of the read communication line - via asset, and then newly acquire an IP data flow including a communication line - via asset from the server device as necessary.

[0394] In addition, the transmission of the decoded video information and audio information from the digital interface unit 40125 to the monitor device 40300 is mainly performed via the data lane of the connection cable 40200 and may be transmitted in a predetermined format compliant with, for example, the HDMI (registered trademark) specification. Also, when the program to be viewed is a program whose layout setting is controlled by the description of LCT, as shown in an example in FIG. 35A, the decoded video information output from the digital interface unit 40125 may already have the layout setting applied. Therefore, in the monitor device 40300, it is possible to display video information on the monitor unit with the layout setting intended by the content provider without requiring special processing.

[0395] <B - 2: Output of Decoded Video Information and Audio Information 2> A second example of an output format for video information and audio information supported by the broadcast receiving device 40100 is a format in which, for assets via a broadcast transmission path, the decoded video information output from the video synthesis unit 161 and the decoded audio information output from the audio synthesis unit 164 are output directly from the digital interface unit 40125, and for assets via a communication line, the assets via the communication line output from the separation unit 132 are output directly from the digital interface unit 40125, and the decoded video information and audio information are sent to the monitor device 40300 via the data lane of the connection cable 40200, and the assets via the communication line are sent via the communication line of the connection cable 40200.

[0396] In this second example, when viewing a program currently being broadcast, the broadcast receiving device 40100 appropriately decodes broadcast transmission path via assets included in the IP data flow transmitted via the broadcast transmission path using the video decoder 141, audio decoder 143, superimposed text decoder 144, subtitle decoder 145, data decoder 151, etc., and further controls the decoded video information and audio information that have been subjected to synthesis processing in the video synthesis unit 161 and audio synthesis unit 164 to be output to the monitor device 40300 via the digital interface unit 40125. On the other hand, the broadcast receiving device 40100 controls the communication line via assets included in the IP data flow distributed via the communication line to be output from the separation unit 132 in the format of the IP data flow including the communication line via assets, and to be output to the monitor device 40300 via the digital interface unit 40125. In addition, if the application control code is specified by "PREFETCH" and an IP data flow including assets via a communication line has already been cached, the IP data flow read from the cache may be output to the monitor device 40300 via the digital interface unit 40125.

[0397] Furthermore, when viewing a recorded program stored in storage, the broadcast receiving device 40100 decodes broadcast transmission path assets read from storage by playback processing as appropriate using the video decoder 141, audio decoder 143, superimposed text decoder 144, subtitle decoder 145, data decoder 151, etc. With regard to communication line via assets, the communication line via assets read from storage by playback processing may be reconstructed into an IP data flow format and input to the digital interface unit 40125, or an IP data flow including the communication line via assets newly acquired from a server device may be input to the digital interface unit 40125. Furthermore, the broadcast receiving device 40100 controls the IP data flow including the decoded video information and audio information that have been subjected to synthesis processing by the video synthesis unit 161 and audio synthesis unit 164 and the communication line via assets to be output to the monitor device 40300 via the digital interface unit 40125.

[0398] During the playback process, the priority of the assets via communication lines read from storage and the assets via communication lines included in the IP data flow newly obtained from the server device to be output from the digital interface unit 40125 may be determined using a method similar to that described above in (B-1).

[0399] 35B, the transmission of the IP data flow including the decoded video information and audio information and the via-communication-line assets from the digital interface unit 40125 to the monitor device 40300 may be controlled so that, for the decoded video information and audio information, it is mainly performed via the data lane of the connection cable 40200, and for the IP data flow including the via-communication-line assets, it is mainly performed via the communication line of the connection cable 40200. Furthermore, the delivery process of the IP data flow including the via-communication-line assets to the monitor device 40300 via the communication line of the connection cable 40200 may be performed by delivering the IP data flow including the via-communication-line assets output from the separation unit 132 from the digital interface unit 40125 to the monitor device 40300 in a push format. Alternatively, the IP data flow including the assets via the communication line output from the separation unit 132 may be temporarily stored in the server data storage area 41400 of the storage (accumulation) unit 110, and the stored IP data flow including the assets via the communication line may be distributed from the digital interface unit 40125 in response to a request from the monitoring device 40300. Regarding the distribution process of the IP data flow including the assets via the communication line to the monitoring device 40300 via the communication line of the connection cable 40200, similar processing may be performed in the following explanation.

[0400] Furthermore, association information, which is various control information for associating the decoded video information and audio information with the assets via the communication line, is transmitted via a data lane of the connection cable 40200. The decoded video information and audio information may be transmitted via the data lane of the connection cable 40200 in a predetermined format conforming to the HDMI specification, for example. The association information may be transmitted via the data lane of the connection cable 40200 using, for example, a reserved area or the like defined in the HDMI specification. The reserved area or the like may be an area, for example, arranged in a blanking interval in the HDMI specification, in which each manufacturer can specify how to use it.

[0401] The association information may be reference location information indicating a reference destination for acquiring the asset via the communication line, reference time information for controlling the decoding time and presentation time of the asset via the communication line, layout control information for controlling layout settings in the monitor display of the program to be viewed, etc. Other information may also be transmitted as association information.

[0402] The reference location information is information indicating a reference destination for the monitoring device 40300 to acquire the asset via the communication line. When the monitoring device 40300 is caused to acquire an IP data flow including the asset via the communication line from a server device, the broadcast receiving device 40100 can simply transfer the location information of the MPT, etc. included in the IP data flow acquired via the broadcast transmission path to the monitoring device 40300 as reference location information. When the monitoring device 40300 is caused to acquire an IP data flow including the asset via the communication line distributed from the broadcast receiving device 40100, the broadcast receiving device 40100 can simply rewrite the location information of the MPT, etc. included in the IP data flow acquired via the broadcast transmission path and then transmit it to the monitoring device 40300 as reference location information. Both of the reference location information may be sent to the monitoring device 40300, and the monitoring device 40300 may be allowed to select whether to acquire an IP data flow including the asset via the communication line from the server device again, or to acquire an IP data flow including the asset via the communication line distributed from the broadcast receiving device 40100.

[0403] Specifically, the rewriting process involves rewriting location information (corresponding to "MMT_general_location_info()" shown in FIG. 17) related to assets via communication lines included in the MPT from "location_type=0x01," which indicates data multiplexed in an IPv4 data flow, or "location_type=0x02," which indicates data multiplexed in an IPv6 data flow, to "location_type=0x05," which indicates data at a specified URL. Furthermore, the description of the specified URL can be set to point to the server data storage area 41400 managed by the server function execution unit 41103 of the broadcast receiving device 40100. In the rewriting process of the location information of the MPT, it is preferable to rewrite the description of the reference destination in the same format as the location information of the MPT transmitted via broadcast waves, without changing its format. This is because when the data output from the broadcast receiving device 40100 and received by the monitoring device 40300 is interpreted by the monitoring device 40300, it can be interpreted using the same functions as the MPT location information transmitted via broadcast waves. If the monitoring device 40300 has the same broadcast wave receiving function as the broadcast receiving device 40100, that function can be applied to the reception and interpretation process of the digital interface output from the broadcast receiving device 40100, and there is no need to install a unique function. Therefore, this configuration can reduce the cost of the entire system.

[0404] In addition, when the monitoring device 40300 acquires the asset via the communication line from an IP data flow delivered in push format from the broadcast receiving device 40100, the reference location information may be the IP packet ID of the IP data flow that the monitoring device 40300 should refer to, or the asset ID of the asset via the communication line that should be acquired.

[0405] The reference time information may be the NTP acquired by the broadcast receiving device 40100 transferred as is, or may be a value of the NTP that has been added with a predetermined offset value before transmission. In the monitoring device 40300, if the IP data flow including the decoded video information and audio information and the asset via the communication line transmitted from the broadcast receiving device 40100 is a playback process of a recorded program recorded in storage, it is desirable to control the decoding and presentation process of the asset via the communication line based on the reference time information transmitted from the broadcast receiving device 40100. Therefore, when transmitting the IP data flow including the decoded video information and audio information and the asset via the communication line to the monitoring device 40300, the broadcast receiving device 40100 of this embodiment simultaneously transmits playback program flag information indicating whether the IP data flow including the decoded video information and audio information and the asset via the communication line is a program currently being broadcast or a playback process of a recorded program. The playback program flag information may also be one of the association information.

[0406] The layout control information is information indicating the setting contents of the LCT when the program is a program for which layout setting control is performed according to the description of the LCT. The monitor device 40300 is capable of controlling the layout setting when displaying on the monitor based on the layout control information.

[0407] The monitor device 40300 acquires the decoded video information, audio information, and layout control information from the broadcast receiving device 40100, and acquires the IP data flow including the assets via the communication line from the broadcast receiving device 40100 or a server device, thereby enabling the monitor device 40300 to display the decoded video and various data transmitted in the IP data flow in the intended layout at the time of broadcast. As mentioned above, even if the broadcast receiving device 40100 performs a location information rewrite process, the broadcast receiving device 40100 may output the LCT information as it was at the time of reception without rewriting it. This is because in the LCT, only the asset acquisition destination for the area to which the assets via the communication line were assigned at the time of reception is changed by rewriting the location information, and the layout itself does not need to be changed. Therefore, if the monitor device 40300 has the same broadcast wave receiving function as the broadcast receiving device 40100, when the decoded video of a program recorded by the broadcast receiving device 40100 and then played back is output to the monitor device 40300 via the digital interface, location information in which the reference description has been rewritten while maintaining the same format as the MPT location information transmitted via broadcast waves, and LCT information that has not been rewritten while maintaining the same description as transmitted via broadcast waves (there is no need to rewrite it when recording or playing back), can be transmitted from the broadcast receiving device 40100 to the monitor device 40300 via the digital interface, which makes it possible to interpret control information in the same manner as the broadcast wave receiving function of the monitor device 40300, and therefore makes it possible to more efficiently reproduce on the monitor device 40300 the display in the layout intended at the time of broadcast.

[0408] In addition, when the layout setting described in the LCT indicates a layout consisting only of assets via the broadcast transmission path, the layout setting may be controlled on the broadcast receiving device 40100 side, the decoded video information and audio information may be synthesized in a layout-set state, and transmitted to the monitor device 40300 via the data lane of the connection cable 40200. In this case, the layout control information does not need to be transmitted as association information.

[0409] Also, in the output format of this second example, even when the monitor device 40300 does not support the output format of the second example, only the video information based on the broadcast transmission path asset can be displayed, which is an advantage.

[0410] <B-3: Output 1 of Encoded Video Data and Audio Data> A third example of the output format of the video data and audio data supported by the broadcast receiving device 40100 is a format in which one IP data flow including a broadcast transmission path asset and a communication line path asset is output from the digital interface unit 40125 and transmitted to the monitor device 40300 via a data lane or a communication line of the connection cable 40200.

[0411] In this third example, when the broadcast receiving device 40100 watches a broadcast program, it respectively acquires an IP data flow including a broadcast transmission path asset transmitted via the broadcast transmission path and an IP data flow including a communication line path asset distributed via the communication line, and outputs each IP data flow as it is from the separation unit 132. Further, in the transcoding processing unit 40181, a process of synthesizing the IP data flow including the broadcast transmission path asset and the IP data flow including the communication line path asset into one IP data flow is performed, and control is performed so that the synthesized IP data flow is output from the digital interface unit 40125 to the monitor device 40300. When the IP data flow including the communication line path asset has been cached due to the application control code being specified as 'PREFETCH', the synthesis process in the transcoding processing unit 40181 may be performed using the IP data flow including the broadcast transmission path asset and the IP data flow read from the cache.

[0412] Furthermore, when viewing a recorded program stored in storage, the broadcast receiving device 40100 may reconstruct the broadcast transmission path via assets and the communication line via assets read from storage by the playback process into the form of a single IP data flow in the transcode processing unit 40181, and output the reconstructed IP data flow as a combined IP data flow from the digital interface unit 40125. If the recording process to storage is performed on a package basis or an IP data flow basis, the transcode processing unit 40181 may perform a combination process on the IP data flow including the broadcast transmission path via assets read from storage by the playback process and the IP data flow including the communication line via assets. Furthermore, the communication line via assets may be newly acquired from a server device, and the transcode processing unit 40181 may perform a combination process on the IP data flow including the broadcast transmission path via assets read from storage and the IP data flow including the communication line via assets newly acquired from the server device.

[0413] During the playback process, the priority of which IP data flow containing assets via communication lines read from storage or which IP data flow containing assets via communication lines newly obtained from the server device should be used for the synthesis process can be determined using a method similar to that described above in (B-1).

[0414] Note that various control signals (such as MMT-SI) placed together with the broadcast transmission path assets in the IP data flow transmitted via the broadcast transmission path are essentially placed as is in the synthesized IP data flow obtained as a result of the synthesis process of the IP data flow including the broadcast transmission path assets and the IP data flow including the communication line assets in the transcode processing unit 40181. However, the association information associating the broadcast transmission path assets with the communication line assets is rewritten as appropriate. Specifically, the rewriting process involves rewriting location information (corresponding to "MMT_general_location_info()" shown in Figure 17) related to the communication line assets included in the MPT from "location_type=0x01" indicating data multiplexed into an IPv4 data flow or "location_type=0x02" indicating data multiplexed into an IPv6 data flow to "location_type=0x00" indicating data multiplexed into the own IP data flow.

[0415] The combined IP data flow output from the transcode processing unit 40181 may be transmitted to the monitoring device 40300 via the data lane of the connection cable 40200, as shown in an example in FIG. 35C. Alternatively, it may be distributed to the monitoring device 40300 via the communication line of the connection cable 40200. In this case, the monitoring device 40300 needs to perform decoding processing of each asset based on various control information included in the combined IP data flow transmitted from the broadcast receiving device 40100. In other words, it is desirable that the monitoring device 40300 has a configuration similar to that of the broadcast receiving device 100 shown in FIG. 7A, and is capable of decoding processing of MMT data strings.

[0416] When the synthesized IP data flow is output from the digital interface unit 40125 and transmitted to the monitor device 40300 via the data lane of the connection cable 40200, for example, it may be performed by storing the synthesized IP data flow as it is in a storage area for video information and audio information in a predetermined format compliant with the HDMI (registered trademark) specification. In this case, it is desirable to transmit information indicating that the data stored in the storage area for the video information and audio information is the synthesized IP data flow, and information indicating that the MMT data sequence and its control information are included in the synthesized IP data flow and that decoding processing of the MMT data sequence is required for program viewing, using, for example, a reserved area defined in the HDMI specification.

[0417] <B-4: Output of Encoded Video Data and Audio Data 2> A fourth example of the output format of the video data and audio data corresponding to the broadcast receiving device 40100 is to output an IP data flow including a broadcast transmission path asset and an IP data flow including a communication line path asset from the digital interface unit 40125. As shown in an example in FIG. 35D, for the IP data flow including the broadcast transmission path asset, it is transmitted to the monitor device 40300 via the data lane of the connection cable 40200, and for the IP data flow including the communication line path asset, it is transmitted to the monitor device 40300 via the communication line of the connection cable 40200.

[0418] In this fourth example, when viewing a currently broadcast program, the broadcast receiving device 40100 acquires an IP data flow including broadcast transmission path via-assets transmitted via the broadcast transmission path and an IP data flow including communication line via-assets distributed via the communication line, and outputs each IP data flow as is from the separation unit 132. Furthermore, the IP data flow including the broadcast transmission path via-assets is transmitted from the digital interface unit 40125 to the monitoring device 40300 via the data lane of the connection cable 40200, and the IP data flow including the communication line via-assets is distributed from the digital interface unit 40125 to the monitoring device 40300 via the communication line of the connection cable 40200. Note that if the IP data flow including the communication line via-assets has been cached because the application control code "PREFETCH" is specified, the IP data flow read from the cache can be distributed to the monitoring device 40300 from the digital interface unit 40125 via the communication line of the connection cable 40200.

[0419] Furthermore, when viewing a recorded program stored in storage, the broadcast receiving device 40100 reconstructs the broadcast transmission path via assets and the communication line via assets read from storage by playback processing into the form of IP data flows using the transcode processing unit 40181. Furthermore, the IP data flow reconstructed from the broadcast transmission path via assets may be transmitted to the monitoring device 40300 via the data lane of the connection cable 40200, and the IP data flow reconstructed from the communication line via assets may be transmitted to the monitoring device 40300 via the communication line of the connection cable 40200. When the recording processing to the storage is performed on a package basis or an IP data flow basis, the IP data flow including the broadcast transmission path via assets and the IP data flow including the communication line via assets read from storage by playback processing may be transmitted to the monitoring device 40300 via the data lane and communication line of the connection cable 40200, respectively. In addition, the assets via the communication line may be acquired again from the server device, and the IP data flow including the assets via the communication line output from the separation unit 132 may be distributed to the monitor device 40300 via the communication line of the connection cable 40200.

[0420] During the playback process, the priority of whether to deliver to the monitor device 40300 an IP data flow containing assets via a communication line read from storage or an IP data flow containing assets via a communication line newly obtained from the server device can be determined using a method similar to that described above in (B-1).

[0421] Note that various control signals (such as MMT-SI) placed along with the broadcast transmission path assets in the IP data flow transmitted via the broadcast transmission path are basically placed directly in the IP data flow including the broadcast transmission path assets output from the digital interface unit 40125. However, the association information associating the broadcast transmission path assets with the communication line assets is rewritten as appropriate. Specifically, the rewriting process involves rewriting location information (corresponding to "MMT_general_location_info()" shown in FIG. 17) related to the communication line assets included in the MPT from "location_type=0x01," which indicates data multiplexed in an IPv4 data flow, or "location_type=0x02," which indicates data multiplexed in an IPv6 data flow, to "location_type=0x05," which indicates data located at a specified URL. Furthermore, the specified URL is set to point to the server data storage area 41400 managed by the server function execution unit 41103 of the broadcast receiving device 40100.

[0422] The rewriting process is performed when the monitoring device 40300 is made to acquire an IP data flow including the asset via the communication line distributed from the broadcast receiving device 40100. When the monitoring device 40300 is made to acquire an IP data flow including the asset via the communication line from a server device, the rewriting process does not need to be performed.

[0423] Furthermore, when outputting the IP data flow including the assets via the broadcast transmission path from the digital interface unit 40125 and transmitting it to the monitor device 40300 via the data lane of the connection cable 40200, this may be done by storing the IP data flow including the assets via the broadcast transmission path as is in a storage area for video information and audio information in a predetermined format that conforms to the HDMI (registered trademark) specification. In this case, it is desirable to transmit, for example, information indicating that the data stored in the storage area for video information and audio information is an IP data flow including the assets via the broadcast transmission path, and information indicating that the IP data flow including the assets via the broadcast transmission path includes an MMT data string and its control information and that decoding processing of the MMT data string is required for program viewing, using a spare area or the like specified in the HDMI specification.

[0424] As described above, the broadcast receiving device 40100 of this embodiment can appropriately select from the output formats (B-1) to (B-4) described above. Furthermore, it is also possible to appropriately combine the output formats (B-1) to (B-4) described above. For example, in accordance with the output format (B-2) described above, some communication line via assets are decoded by the broadcast receiving device 40100, and then synthesized with video information and audio information obtained by decoding the broadcast transmission path via assets, and transmitted to the monitor device 40300 via the data lane of the connection cable 40200. Other communication line via assets may be controlled so that they are directly distributed to the monitor device 40300 via the communication line of the connection cable 40200. Furthermore, for example, in accordance with the output format of (B-4) above, among the assets constituting the broadcast transmission path assets and communication line assets, video assets, audio assets, etc. may be transmitted as a single IP data flow to the monitor device 40300 via the data lane of the connection cable 40200, and data assets, subtitle assets, etc. may be controlled to be distributed as a single IP data flow to the monitor device 40300 via the communication line of the connection cable 40200.

[0425] In the broadcast receiving device 40100, control of the output format may be performed according to the display performance of the monitor device 40300 acquired via the DDC line of the connection cable 40200. The display performance may be acquired by means other than that described above. In this embodiment, the display performance refers to items such as the decoding performance of the monitor device 40300 for MMT data strings, whether or not it is compatible with network communication via the communication line of the connection cable 40200, and whether or not it has a LAN communication function for the Internet 200.

[0426] When the output format of the video information and audio information from the broadcast receiving device 40100 is (B-4), the monitor device 40300 receives, via a digital interface unit, an IP data flow including the broadcast transmission path assets transmitted from the broadcast receiving device 40100 via the unidirectional transmission data lane of the connection cable 40200, and inputs the received IP data flow to an MMT decoding processing unit. The MMT decoding processing unit references the MMT-SI included in the IP data flow and, based on location information and the like included in the MPT, requests the broadcast receiving device 40100 to transmit the IP data flow including the communication line assets via the communication line line of the connection cable 40200, which is capable of bidirectional transmission. Under the control of the server function execution unit 41103, the broadcast receiving device 40100 transmits the IP data flow including the communication line assets stored in the server data storage area 41400 of the storage (accumulation) unit 110 to the monitor device 40300 via the communication line of the connection cable 40200, which is capable of bidirectional transmission. The monitor device 40300 appropriately decodes the communication line via assets received via the communication line of the connection cable 40200 and the broadcast transmission path via assets received via the data lane of the connection cable 40200, and provides the video information and audio information to the user via the monitor unit and speaker. Similar processing is also performed when the output format of the video information and audio information from the broadcast receiving device 40100 is (B-2) or (B-3) above.

[0427] In the above description, when the output format of the video information and audio information from the broadcast receiving device 40100 is the above-mentioned (B-2) or (B-4), the transmission of the IP data flow including the asset via the communication line is performed via the communication line of the connection cable 40200. However, this is merely an example, and for example, the transmission of the IP data flow including the asset via the communication line may be performed by outputting it from the LAN communication unit 121 of the broadcast receiving device 40100, passing it through the router device 200r, and inputting it to a LAN communication unit (not shown) of the monitor device 40300. Similarly, when the output format of the video information and audio information from the broadcast receiving device 40100 is the above-mentioned (B-3), the transmission of the combined IP data flow obtained by combining the asset via the broadcast transmission path and the asset via the communication line into one IP data flow may be performed by outputting it from the LAN communication unit 121 of the broadcast receiving device 40100, passing it through the router device 200r, and inputting it to a LAN communication unit (not shown) of the monitor device 40300.

[0428] However, when performing the above-mentioned transmission process, the device to which the IP data flow including the asset via the communication line or the combined IP data flow is sent is limited to a device having an IP address restricted by the same subnet mask as the IP address of the broadcast receiving device 40100. By imposing such a restriction, devices outside the user's control will not be able to obtain the IP data flow including the asset via the communication line or the combined IP data flow, etc., without restriction, for example, via the Internet 200, which is preferable in terms of copyright management of program content.

[0429] Furthermore, when location information related to a communication-line asset included in an MMT data sequence acquired by broadcast receiving device 40100 via a broadcast transmission path indicates a URL, the URL indicates an IP address of an external network from the perspective of broadcast receiving device 40100. On the other hand, broadcast receiving device 40100 and monitoring device 40300 are directly connected by connection cable 40200, that is, they can be said to be configured within an area restricted by the same subnet mask. Therefore, the rewriting process of reference location information described in the explanation of the output format in (B-2) can be said to be a process of rewriting location information indicating an IP address that is not within the same subnet mask as the subnet mask to which the IP addresses of broadcast receiving device 40100 and monitoring device 40300 belong, to location information indicating an IP address within the same subnet mask as the subnet mask to which the IP addresses of broadcast receiving device 40100 and monitoring device 40300 belong.

[0430] Furthermore, in the output formats (B-2) or (B-4) described above, the broadcast receiving device 40100 outputs data contained in an IP data flow acquired via a unidirectional broadcast transmission path and data contained in an IP data flow acquired via a communication line capable of bidirectional transmission via different lines, even though the same wired digital interface is used. Using different lines in this way allows the two IP data flows to be output separately without performing special multiplexing processing to combine them into a single IP data flow. That is, in the example of the output format (B-4) described above, the IP data flow acquired by the broadcast receiving device 40100 via the broadcast transmission path and the IP data flow acquired via the communication line are output as the IP data flow of the first output signal and the IP data flow of the second output signal, respectively, without being multiplexed with each other, although processing such as rewriting location information is performed. This eliminates the need for special multiplexing processing of the IP data flow of the first output signal and the IP data flow of the second output signal, and therefore eliminates the need for the monitoring device 40300 to incorporate demultiplexing processing corresponding to the special multiplexing processing. Rather, if the first output signal and the second output signal are configured to be output as MMT data sequences, and if the monitor device 40300 has an MMT decoder similar to that of the broadcast receiving device 40100, the first output signal and the second output signal can be decoded without any special separation processing, and this output state is beneficial as it makes the system highly versatile.

[0431] In the above example, the broadcast receiving device 40100 outputs data contained in the IP data flow acquired via the unidirectional broadcast transmission path to the external monitoring device 40300 via the unidirectional transmission line of the wired digital interface, and outputs data contained in the IP data flow acquired via the bidirectional communication line to the external monitoring device 40300 via the bidirectional transmission line of the wired digital interface. The monitoring device 40300 acquires data acquired by the broadcast receiving device 40100 via the unidirectional broadcast transmission path from the unidirectional transmission line of the wired digital interface, and data acquired by the broadcast receiving device 40100 via the bidirectional communication line from the bidirectional transmission line of the wired digital interface. Therefore, the monitoring device 40300 has high processing affinity with the broadcast receiving device 40100 of this embodiment. In other words, the monitoring device 40300 can be manufactured by utilizing many of the processing circuits of the broadcast receiving device 40100, reducing the number of dedicated processing circuits and enabling low-cost production. This makes it possible to provide users with a more suitable system at low cost.

[0432] The transmission line capable of one-way communication described in each of the above embodiments may be a single physical line or a group of lines combining multiple lines. The transmission line capable of two-way communication described in each of the above embodiments may be a single physical line or a group of lines combining multiple lines that transmit using a two-way communication protocol. Furthermore, the settings for output format control in each of the above-described embodiments may have predetermined initial values ​​at the time of shipment. However, it is desirable to configure the predetermined initial values ​​so that they can be changed to settings that correspond to each user's usage environment by user operation via the operation input unit 170. This is because even if correct information about the performance of the monitoring device 40300 cannot be obtained due to a malfunction of the broadcast receiving device 40100 itself or the software of the monitoring device 40300, it is possible to configure the device so that data output can be obtained by manual setting using the output format control required by the user, thereby preventing any disadvantage to the user.

[0433] Although examples of the embodiments of the present invention have been described above using Examples 1 to 4, the configurations for realizing the technology of the present invention are not limited to the above examples, and various modifications are possible. For example, it is possible to replace part of the configuration of one example with the configuration of another example, or it is also possible to add the configuration of another example to the configuration of one example. All of these fall within the scope of the present invention. Furthermore, numerical values, messages, etc. appearing in the text and figures are merely examples, and the effects of the present invention will not be impaired even if different ones are used.

[0434] The functions of the present invention described above may be realized in part or in whole by hardware, for example by designing them as integrated circuits. Alternatively, 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 also be used in combination.

[0435] The software that controls the broadcast receiving device 100 may be stored in the ROM 103 and / or storage unit 110 of the broadcast receiving device 100 before the product is shipped. Alternatively, the software may be acquired via the LAN communication unit 121 from another application server 500 on the Internet 200 after the product is shipped. Alternatively, the software may be stored on a memory card, optical disk, or the like and acquired via the expansion interface unit 124.

[0436] In addition, the control lines and information lines shown in the diagram are those considered necessary for explanation, and do not necessarily represent all the control lines and information lines on the product. In reality, it can be assumed that almost all components are interconnected. [Explanation of symbols]

[0437] 100,800,40100...Broadcast receiving device, 100a,40100a...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, 125,825,40125...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...character super 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, 40181...transcoding processing 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, 40200...connection cable, 40300...monitor device.

Claims

[Claim 1] A content protection processing method in a broadcast receiving device of a transmission system in which control information related to a broadcast program and broadcast program content are transmitted from a broadcast station side and the control information and the broadcast program content are received by a receiving unit of the broadcast receiving device, comprising: a receiving step of receiving the control information related to the broadcast program and the broadcast program content by the receiving unit of the broadcast receiving device; a recording reservation step of reserving a recording of the broadcast program by using an EIT containing information about an event among the control information received in the receiving step; a storage step of storing the broadcast program content received by the receiving unit of the broadcast receiving device in the receiving step, using copy control information among the control information received by the receiving unit of the broadcast receiving device in the receiving step, for the broadcast program reserved for recording in the recording reservation step; a video output step of controlling acquisition of a video using an AIT, which is information about an application, among the control information received in the receiving step, and outputting the video of the broadcast program content received by the receiving unit of the broadcast receiving device; Equipped with In the storing step, when the broadcast program content received by the receiving unit of the broadcast receiving device in the receiving step is content that has been transmitted in the transmission system with copy protection of one generation only specified by copy control information included in the control information, the broadcast program content is stored in an encrypted state so as to be playable only by the broadcast receiving device, In the storage step, the storage of the broadcast program content received by the receiving unit of the broadcast receiving device in the receiving step can be performed in a storage unit at the output destination of an IP interface configured by hardware compatible with Ethernet provided in the broadcast receiving device, The EIT includes information about the next event after the current event. Content protection processing method.

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