Receiving device

Abstract

To provide a digital broadcasting receiver capable of performing functions with higher added value.SOLUTION: A broadcast receiver 100 performs a determination process of an output status of contents from an interface in accordance with whether it is possible to receive control information indicating a copy control state for contents to be received with contents at a receiving unit, control information specifying whether protection is required for the content, control information specifying a combination of the resolution of a video of contents when output from an interface and transmission characteristics of the video of the contents when output from the interface and whether protection is required or not. If the receiving unit cannot receive control information that specifies whether protection is required for the contents or not, the control unit determines that the control information specifying whether protection is required for the contents indicates that protection is unnecessary and performs a determination process.SELECTED DRAWING: Figure 7A

Description

[Technical field]

[0001] The present invention relates to a receiving device. [Background technology]

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

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

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

[0005] An object of the present invention is to provide a broadcast receiving device capable of executing functions with higher added value. [Means for solving the problem]

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

[0007] As an example, there is provided a method for protecting content in a transmission system in which content having a resolution exceeding 1920 pixels horizontal by 1080 pixels vertical (hereinafter referred to as "over 2K content") is transmitted from a broadcast station side as content of a broadcast program and a receiving device receives the over 2K content, the transmission system being configured to transmit from the broadcast station side to the receiving device none of control information corresponding to an L2-Only flag of DTCP2, control information corresponding to an EI flag of DTCP2, control information corresponding to an HDR flag of DTCP2, and control information corresponding to an SDO flag of DTCP2, and the transmission system includes a transmission step of transmitting the content of the broadcast program from the broadcast station side to the receiving device, a reception step of the receiving device receiving the over 2K content transmitted in the transmission step, a storage step of the receiving device storing the over 2K content received in the receiving step, and an output step of outputting the over 2K content stored in the storage step as over 2K content via an interface of the receiving device, and the over 2K content received in the receiving step is a content that has been previously In the case where the content is transmitted in the transmission system with one-generation copy protection or number-limited copy protection, the over 2K content received in the receiving step is made playable only by the receiving device and stored in the storing step, and when the over 2K content stored in the storing step is output through the interface after protecting the content by DTCP2 by setting, in the output step, one bit each of an L2-Only flag, an EI flag, an HDR flag, and an SDO flag, which are control information of DTCP2, the receiving device sets one bit of an L2-Only flag, one bit of an EI flag, one bit of an HDR flag, and one bit of an SDO flag of DTCP2 for the over 2K content to be output through the interface without acquiring, from the transmission system, any of control information corresponding to the L2-Only flag of DTCP2, control information corresponding to the EI flag of DTCP2, control information corresponding to the HDR flag of DTCP2, and control information corresponding to the SDO flag of DTCP2,When the over 2K content is received in the receiving step, whether the over 2K content is a content that has been transmitted in the transmission system with protection specified for one-generation copying or a content that has been transmitted in the transmission system with protection specified for number-limited copying, when the over 2K content stored in the storing step is output as the over 2K content through the interface in the outputting step after content protection by DTCP2, the L2-Only flag of DTCP2 is fixed to 0 and the SDO flag is fixed to 0. a content protection method in which, when the content is protected by DTCP2 and output via the interface in the output step, the settings of the 1-bit L2-Only flag, EI flag, HDR flag, and SDO flag, which are DTCP2 control information, do not change from the settings when the transfer characteristic information about the 2K or higher content is transmitted from the broadcast station side and the receiving device is able to receive the transfer characteristic information in the receiving step, even if transfer characteristic information indicating the transfer characteristic of the 2K or higher content is not transmitted from the broadcast station side and the receiving device is unable to acquire the transfer characteristic information in the receiving step. Effect of the Invention

[0008] By using the technique of the present invention, it is possible to provide a broadcast receiving device capable of executing functions with higher added value. [Brief description of the drawings]

[0009] [Figure 1] 1 is a system configuration diagram showing an example of a broadcast communication system including a broadcast receiving device according to a first embodiment. [Figure 2A] FIG. 1 is an explanatory diagram of an overview of a coded signal in MMT. [Figure 2B] This is a diagram showing the configuration of an MPU in MMT. [Figure 2C] FIG. 1 is a diagram showing the structure of an MMTP packet in MMT. [Diagram 3] FIG. 1 is a conceptual diagram of a protocol stack for a broadcasting system using MMT. [Figure 4] FIG. 2 is a diagram showing a hierarchical structure of control information used in a broadcasting system. [Figure 5A] This is a list of tables used in the TLV-SI of the broadcasting system. [Figure 5B] This is a list of descriptors used in the TLV-SI of the broadcasting system. [Figure 6A] This is a list of messages used in the MMT-SI broadcasting system. [Figure 6B] 1 is a list of tables used in MMT-SI of the broadcasting system. [Figure 6C] This is a list of descriptors used in the MMT-SI of the broadcasting system (part 1). [Figure 6D] This is a list of descriptors used in the MMT-SI of the broadcasting system (part 2). [Figure 6E] FIG. 2 is a diagram showing the relationship between data transmission in a broadcasting system and each table. [Figure 7A] 1 is a block diagram of a broadcast receiving device according to a first embodiment. [Figure 7B] 2 is a configuration diagram of a logical plane structure of a presentation function of the broadcast receiving device according to the first embodiment. FIG. [Figure 7C] 1 is a system configuration diagram of clock synchronization / presentation synchronization of a broadcast receiving device according to a first embodiment. [Figure 7D] 2 is a software configuration diagram of the broadcast receiving device according to the first embodiment. [Figure 8] FIG. 2 is a block diagram of a broadcast station server according to the first embodiment. [Figure 9] FIG. 2 is a block diagram of a service provider server according to the first embodiment. [Figure 10A] FIG. 2 is a block diagram of a portable information terminal according to the first embodiment. [Figure 10B] FIG. 2 is a software configuration diagram of the portable information terminal according to the first embodiment. [Figure 11A] A diagram showing the data structure of MH-TOT of a broadcasting system. [Figure 11B]A diagram showing the format of the JST_time parameter of a broadcasting system. [Figure 12] 11 is a diagram illustrating a method of calculating the current date from the MJD of the broadcast receiving device in accordance with the first embodiment. FIG. [Figure 13A] A diagram showing the configuration of the NTP format of a broadcasting system. [Figure 13B] A diagram showing the data structure of an MPU timestamp descriptor in a broadcasting system. [Figure 13C] A diagram showing the data structure of time information in the TMCC extended information area of ​​a broadcasting system. [Figure 14] FIG. 4 is an operational sequence diagram during channel scanning of the broadcast receiving device according to the first embodiment. [Figure 15A] A diagram showing the data structure of the TLV-NIT of a broadcasting system. [Figure 15B] A diagram showing the data structure of a satellite distribution system descriptor of a broadcasting system. [Figure 15C] A diagram showing the data structure of a service list descriptor for a broadcasting system. [Figure 15D] A diagram showing the data structure of AMT of a broadcasting system. [Figure 16] 4 is a diagram showing an operation sequence when the broadcast receiving device according to the first embodiment selects a channel. FIG. [Figure 17] A diagram showing the data structure of the MPT of the broadcasting system. [Figure 18] A diagram showing the data structure of the LCT of the broadcasting system. [Figure 19A] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19B] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19C] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 19D] FIG. 13 is a diagram showing an example of allocation of layouts to layout numbers based on the LCT. [Figure 20A]11A and 11B are diagrams illustrating the operation of exception handling in screen layout control based on the LCT. [Figure 20B] 11A and 11B are diagrams illustrating the operation of exception handling in screen layout control based on the LCT. [Figure 21] A diagram showing the data structure of the MH-EIT of the broadcasting system. [Figure 22A] 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 22B] 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment. FIG. [Figure 23] 4 is a screen display diagram of the broadcast receiving device according to the first embodiment when an emergency alert broadcast is displayed. FIG. [Figure 24] FIG. 11 is a block diagram of a broadcast receiving device according to a second embodiment. [Diagram 25] 11A and 11B are diagrams illustrating inconsistencies in the current time display when switching broadcast services. [Figure 26A] FIG. 11 is a diagram illustrating an operation of current time information reference source selection control according to the second embodiment. [Figure 26B] FIG. 11 is an operation sequence diagram of an update process of current time information according to the second embodiment. [Figure 27A] FIG. 11 is a screen display diagram of an EPG screen of a broadcast receiving device according to a second embodiment. [Figure 27B] FIG. 11 is a screen display diagram of an EPG screen of a broadcast receiving device according to a second embodiment. [Figure 28] FIG. 11 is a system configuration diagram of a broadcast communication system according to a third embodiment. [Figure 29A] A diagram showing the data structure of a content information descriptor of a broadcasting system. [Figure 29B] A diagram explaining the meaning of content types in a content information descriptor of a broadcasting system. [Figure 29C] A diagram explaining the meaning of source device primary color chromaticity coordinates and source device white chromaticity coordinates in the content information descriptor of a broadcasting system. [Figure 29D] A diagram explaining the meaning of EOTF identification in the content information descriptor of a broadcasting system. [Diagram 30] FIG. 11 is a screen display diagram of an EPG screen of a broadcast receiving device according to a third embodiment. [Figure 31A] FIG. 1 is a diagram illustrating a deviation in color gamut between a source device and a monitor device. [Figure 31B] FIG. 11 is a diagram illustrating a color gamut conversion process of a broadcast receiving device according to a third embodiment. [Figure 31C] FIG. 11 is a diagram illustrating a color gamut conversion process of a broadcast receiving device according to a third embodiment. [Diagram 32] FIG. 11 is a diagram for explaining image quality adjustment items of a broadcast receiving device according to a third embodiment. [Figure 33A] FIG. 11 is a diagram illustrating a conversion process of a luminance level in a broadcast receiving device according to a third embodiment. [Figure 33B] FIG. 11 is a diagram illustrating a conversion process of a luminance level in a broadcast receiving device according to a third embodiment. [Diagram 34] FIG. 11 is a system configuration diagram of a broadcast communication system according to a fourth embodiment. [Figure 35A] FIG. 11 is a block diagram of a broadcast receiving device according to a fourth embodiment. [Figure 35B] FIG. 11 is a software configuration diagram of a broadcast receiving device according to a fourth embodiment. [Diagram 36] FIG. 11 is a diagram illustrating an interface configuration between a broadcast receiving device and a monitor device according to a fourth embodiment. [Figure 37] FIG. 11 is a diagram illustrating mastering information output by a broadcast receiving device according to a fourth embodiment. [Figure 38] FIG. 11 is a system configuration diagram of a broadcast communication system according to a fifth embodiment. [Figure 39] FIG. 13 is a diagram illustrating an example of output control information according to the fifth embodiment. [Diagram 40] FIG. 13 is a diagram illustrating an example of reception control information according to the fifth embodiment. [Figure 41A] FIG. 13 is a diagram illustrating an example of reception control information according to the fifth embodiment. [Figure 41B] FIG. 13 is a diagram illustrating an example of reception control information according to the fifth embodiment. [Diagram 42] FIG. 13 is a diagram illustrating an example of reception control information according to the fifth embodiment. [Diagram 43]FIG. 13 is a diagram illustrating an example of a process of determining whether or not to protect output of a content according to the fifth embodiment. [Diagram 44] FIG. 13 is a diagram illustrating an example of a process of determining whether or not to protect output of a content according to the fifth embodiment. [Diagram 45] FIG. 13 is a diagram illustrating an example of a process of determining whether or not to protect output of a content according to the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 radio tower 300t of a broadcast station, a broadcast satellite (or a communication satellite) 300s, a broadcast station server 300, a service provider server 400, other application servers 500, a mobile telephone communication server 600, a base station 600b of a mobile telephone communication network, and a mobile information terminal 700.

[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 passing through the broadcast satellite (or communication satellite) 300s. The broadcast receiving device 100 can also be connected to the Internet 200 via a router device 200r, and can transmit and receive data by communicating with each server device on the Internet 200 and other communication devices.

[0013] The router device 200r is connected to the Internet 200 by wired communication, and is connected to the broadcast receiving device 100 by wired communication or wireless communication, and to the mobile information terminal 700 by wireless communication. The wireless communication may use a method such as Wi-Fi (registered trademark). This allows each server device on the Internet 200 and other communication devices to transmit and receive data to and from the broadcast receiving device 100 and the mobile information terminal 700 via the router device 200r. Note that the communication between the broadcast receiving device 100 and the mobile information terminal 700 may be performed directly using a method such as BlueTooth (registered trademark) or NFC (Near Field Communication) without going through the router device 200r.

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

[0015] The service provider server 400 is a server device prepared by a service provider, and is capable of providing various services linked to broadcast programs distributed from a broadcast station. The service provider server 400 also stores, manages, and distributes video content and metadata provided by the broadcast station server 300, and various content and applications linked to broadcast programs. The service provider server 400 also has a function of searching for and providing a list of available content and applications in response to inquiries from a television receiver or the like. The storage, management, and distribution of the content and metadata and the storage, management, and distribution of the applications may be performed by different server devices. The broadcast station and the service provider may be the same or different. A plurality of service provider servers 400 may be prepared for each different service. The broadcast station server 300 may also have the function of the service provider server 400.

[0016] The other application servers 500 are known server devices that store, manage, and distribute other general applications, operating programs, content, data, etc. There may be a plurality of other application servers 500 on the Internet 200.

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

[0018] The mobile information terminal 700 has a function of telephone communication (call) and data transmission / reception via a mobile telephone communication network, and a function of wireless communication by Wi-Fi (registered trademark) or the like. The mobile information terminal 700 can be connected to the Internet 200 via the router device 200r or the access point 200a, or via a base station 600b of the mobile telephone communication network and a mobile telephone communication server 600, and can transmit and receive data by communication with each server device on the Internet 200 and other communication devices. The access point 200a is connected to the Internet 200 by wired communication, and is connected to the mobile information terminal 700 by wireless communication. The wireless communication may use a method such as Wi-Fi (registered trademark). The communication between the mobile information terminal 700 and the broadcast receiving device 100 may be performed via the access point 200a, the Internet 200, and the router device 200r, or via the base station 600b, the mobile telephone communication server 600, the Internet 200, and the router device 200r.

[0019] [Outline of the MMT method] The broadcast receiving device 100 shown in Fig. 1 is a television receiver that is compatible with MMT (MPEG Media Transport) instead of TS (Transport Stream) (hereinafter referred to as MPEG2-TS) defined in the MPEG (Moving Picture Experts Group)-2 system, which is widely used in conventional digital broadcasting systems, as a media transport method for transmitting data such as video and audio. The television receiver may be compatible with both MPEG2-TS and MMT.

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

[0021] FIG. 2A shows an example of an outline of an encoded signal in the MMT of this embodiment. As shown in the figure, the MMT of this embodiment has an MFU (Media Fragment Unit), an MPU (Media Processing Unit), an MMTP (MMT Protocol) payload, and an MMTP packet as elements constituting an encoded signal. The MFU is a format for transmitting video, audio, etc., and may be configured in NAL (Network Abstraction Layer) unit units or access unit units. The MPU may be configured with MPU metadata including information on the entire MPU configuration, movie fragment metadata including information on the encoded media data, and sample data that is the encoded media data. It is also assumed that the MFU can be extracted from the sample data. In addition, in the case of media such as video components and audio components, the presentation time and the decoding time may be specified in MPU units or access unit units. FIG. 2B shows an example of the configuration of an MPU.

[0022] An MMTP packet is composed of a header section and an MMTP payload, and transmits MFU and MMT control information. The MMTP payload is equipped with a payload header according to the contents (data unit) stored in the payload section. FIG. 2C shows an example of an overview of constructing an MFU from a video / audio signal, storing it in an MMTP payload, and constructing an MMTP packet. For video signals that are encoded using interframe prediction, it is desirable to configure MPUs in GOP (Group Of Pictures) units. If the size of the MFU to be transmitted is small, one MFU may be stored in one payload section, or multiple MFUs may be stored in one payload section. If the size of the MFU to be transmitted is large, one MFU may be divided and stored in multiple payload sections. In addition, the MMTP packet may be protected using a technique such as AL-FEC (Application Layer Forward Error Correction) or ARQ (Automatic Repeat Request) to recover packet loss on the transmission path.

[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 the broadcast program encoded by each of the above methods is in the MFU or MPU format, and is further loaded on the MMTP payload to be MMTP packetized and transmitted in IP (Internet Protocol) packets. In addition, data content related to the broadcast program may also be in the MFU or MPU format, and further loaded on the MMTP payload to be MMTP packetized and transmitted in IP packets. As the data content transmission method, four types are prepared: a subtitle / superimposed transmission method used for streaming data synchronized with broadcasting, an application transmission method used for data transmission asynchronous with broadcasting, an event message transmission method used for synchronous / asynchronous message notification to applications running on a television receiver, and a general-purpose data transmission method for transmitting other general-purpose data in a synchronous / asynchronous manner.

[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. In addition, the TLV (Type Length Value) multiplexing method is used on the broadcast transmission path for efficient transmission of IP packets. An example of a protocol stack for the broadcasting system of this embodiment is shown in Figure 3. In the figure, (A) is an example of a protocol stack on the broadcast transmission path, and (B) is an example of a protocol stack on the communication line.

[0025] In the broadcasting system of this embodiment, a mechanism for transmitting two types of control information, MMT-SI (MMT-Signaling Information) and TLV-SI (TLV-Signaling Information), is provided. MMT-SI is control information that indicates the configuration of a broadcast program, etc. It is in the form of an MMT control message, placed on an MMTP payload, packetized as an MMTP packet, and transmitted in an IP packet. TLV-SI is control information related to multiplexing of IP packets, and provides information for channel selection and correspondence information between IP addresses and services.

[0026] In addition, in broadcasting systems using MMT, time information is also transmitted to provide absolute time. While MPEG2-TS indicates the display time of components based on a different clock for each TS, MMT indicates the display time of components based on Coordinated Universal Time (UTC). These mechanisms enable terminal devices to synchronize and display components transmitted from different transmission points over different transmission paths. IP packets in NTP (Network Time Protocol) format are used to provide UTC.

[0027] [Control information for broadcasting systems using MMT] In the broadcast system compatible with the broadcast receiver 100 of this embodiment, as described above, as control information, TLV-SI related to the TLV multiplexing method for multiplexing IP packets and MMT-SI related to MMT which is a media transport method are prepared. TLV-SI provides information for the broadcast 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 configuration 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 compatible with the broadcast receiver 100 of this embodiment. 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 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 corresponding to the broadcast receiving apparatus 100 of the present embodiment. 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 by 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 by character codes.

[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 corresponding to the broadcast receiving apparatus 100 of the present embodiment. 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) Message 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 receiving apparatus 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 by 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) indicates a list of IP data flows and packet IDs that transmit PA messages of MMT packages provided as broadcast services, and IP data flows that transmit IP services. The PLT may be stored in the PA message.

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

[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 a descriptor for identifying a conditional access method. The CAT (MH) may be stored in a CA message.

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

[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 an M2 section message.

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

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

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

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

[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 organization channel, such as the organization channel name, the broadcaster name, etc. The MH-SDT may 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 Date) 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 to be stored in non-volatile memory in section format for all receivers that receive this. The MH-CDT may be stored in an M2 section message.

[0061] (16) DDM table A data directory management table (DDM table) provides a directory structure of files that configure an application in order to separate the file structure of the application from the structure for file transmission. The DDM table may be stored in a data transmission message.

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

[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 a 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 to which the broadcast receiving apparatus 100 of the present embodiment corresponds. The 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 IDs of the dependent assets. 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 method. The access control descriptor may 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 scheme descriptor provides information for identifying a message authentication scheme when performing message authentication. The message authentication scheme descriptor may 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 ISO / IEC 14496-3 (MPEG-4 Audio) audio stream. The MH-MPEG-4 Audio Descriptor may 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 the coding method specific settings. The MH-MPEG-4 Audio Extension Descriptor may be placed in the MPT.

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

[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 the events. 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 type. The MH-Service List Descriptor may be located in the MH-BIT.

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

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

[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 a text format. The video component descriptor may be placed in the MPT or the 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 refer to the description indicated by the video component descriptor in the MH-EIT by this label. The MH-Stream Identification Descriptor may be placed in the MPT.

[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-Parental Rating Descriptor is used to indicate age-based viewing restrictions and to extend to other restriction conditions. The MH-Parental Rating Descriptor may 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 character form. The MH-audio component descriptor may 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. The MH-series descriptor 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. The MH-SI transmission parameter descriptor 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 expresses the organization channel name and its operator name together with the service format type in character codes. The MH-service descriptor may be placed in the MH-SDT.

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

[0096] (30)MH-CA startup descriptor The MH-CA start descriptor describes start information for starting a CAS program on the CAS platform. The MH-CA start descriptor may 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 may 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 time 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 may be placed in the DAM table.

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

[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. The event message descriptor can be located in the EMT.

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

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

[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 extension timestamp descriptor provides the decoding time of an access unit in the MPU. The MPU extension timestamp descriptor may be placed in the MPT.

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

[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. The MH-application descriptor 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 may be placed in the MH-AIT.

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

[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 for use in cache control when the resources constituting an application are cached and held when the application is expected to be reused. The MH-cache information descriptor may be placed in the MH-AIT.

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

[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 arranged 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 arranged in the DCC table.

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

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

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

[0124] Among the above-mentioned reference destinations, (1) is, for example, an IP data flow received via a digital broadcast signal received by the tuner / demodulator unit 131 of the broadcast receiving device 100 in FIG. 7A, which will be described later. When the MPT is also included in the IP data flow on the communication line side and transmitted, the reference destination of (1) may be an IP data flow received by the LAN communication unit 121, which will be described later, via the communication line. Also, the above (2), (3), (5), and (6) are IP data flows received by the LAN communication unit 121, which will be described later, via the communication line. Also, the above (4) can be used, for example, in the case of a broadcast receiving device having both a receiving function for receiving digital broadcast signals using the MMT method and a receiving function for receiving digital broadcast signals using the MPEG2-TS method, such as the broadcast receiving device 800 of the second embodiment shown in FIG. 24, which will be described later, when referring to data multiplexed in the MPEG2-TS received by the receiving function for receiving digital broadcast signals using the MPEG2-TS method, based on the location information of the MPT included in the digital broadcast signal using the MMT method ("MMT_general_location_info()").

[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 units of this "package" is treated as a "service" unit of digital broadcasting.

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

[0127] The data transmission method of this embodiment shown in Fig. 6E further includes the concept of an "event". An "event" is a concept indicating a so-called "program" handled by the MH-EIT included in the M2 section message and sent. Specifically, in a "package" indicated by an event package descriptor stored in the MH-EIT, a series of data included in a period of time (corresponding to the "start_time" parameter shown in Fig. 21 described later) from the start time stored in the MH-EIT (corresponding to the "start_time" parameter shown in Fig. 21 described later) is data included in the concept of the "event". The MH-EIT can be used in various processes (for example, program guide generation process, control of recording and viewing reservations, copyright management process such as temporary storage) on an "event" basis in the broadcast receiving device 100 of this embodiment.

[0128] [Hardware configuration of broadcast receiving device] 7A is a block diagram showing an example of the internal configuration of the broadcast receiving device 100. The broadcast receiving device 100 is composed of a main control unit 101, a system bus 102, a ROM 103, a RAM 104, a storage (accumulation) unit 110, a LAN communication unit 121, an extension interface unit 124, a digital interface unit 125, a tuner / demodulation unit 131, a separation unit 132, a video decoder 141, a video color gamut conversion unit 142, an audio decoder 143, a superimposed text decoder 144, a subtitle decoder 145, a subtitle synthesis unit 146, a subtitle color gamut conversion unit 147, a data decoder 151, a cache unit 152, an application control unit 153, a browser unit 154, an application color gamut conversion unit 155, a sound source unit 156, a video synthesis unit 161, a monitor unit 162, a video output unit 163, an audio synthesis unit 164, a speaker unit 165, an audio output unit 166, and an operation input unit 170.

[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 in the broadcast receiving device 100.

[0130] The ROM (Read Only Memory) 103 is a non-volatile memory in which a basic operation program such as an operating system and other operation programs are stored, and a rewritable ROM such as an EEPROM (Electrically Erasable Programmable ROM) or a flash ROM is used. Operation setting values ​​required for the operation of the broadcast receiving device 100 may be stored in the ROM 103. The RAM (Random Access Memory) 104 serves as a work area when the basic operation program and other operation programs are executed. The ROM 103 and the RAM 104 may be integrated with the main control unit 101. Also, the ROM 103 may not be an independent configuration as shown in FIG. 7A, but may use a part of the storage area in the storage (accumulation) unit 110.

[0131] The storage (accumulation) unit 110 stores the operation program and operation setting values ​​of the broadcast receiving device 100, personal information of the user of the broadcast receiving device 100, etc. It can also store operation programs downloaded via the Internet 200 and various data created by the operation programs. It can also store content such as moving images, still images, and audio acquired from broadcast waves or downloaded via the Internet 200. A part of the area of ​​the storage (accumulation) unit 110 may replace all or part of the functions of the ROM 103. The storage (accumulation) unit 110 needs to hold the stored information even when power is not supplied from the outside to the broadcast receiving device 100. Therefore, for example, devices such as non-volatile semiconductor element memories such as flash ROM and SSD (Solid State Drive), magnetic disk drives such as HDD (Hard Disk Drive), etc. are used.

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

[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 of it) of a program transmitted via a communication line. The connection to the router device 200r may be a wired connection or a wireless connection such as Wi-Fi (registered trademark). The LAN communication unit 121 includes an encoding circuit, a decoding circuit, and the like. The broadcast receiving device 100 may further include other communication units such as a BlueTooth (registered trademark) communication unit, an NFC communication unit, and an infrared communication unit.

[0134] The tuner / demodulator 131 receives broadcast waves transmitted from a radio tower 300t via the antenna 100a, and tunes (selects) a channel of a service desired by the user under the control of the main controller 101. Furthermore, the tuner / demodulator 131 demodulates the received broadcast signal to obtain an MMT data string. Note that, although the example shown in FIG. 7A illustrates a configuration with one tuner / demodulator, the broadcast receiving device 100 may be configured to include multiple tuners / demodulators for the purpose of simultaneous display of multiple screens, recording of a counter program, etc.

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

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

[0137] The superimposed text decoder 144 decodes the superimposed text data string input from the separation unit 132 and outputs superimposed text information. The subtitle decoder 145 decodes the subtitle data string input from the separation unit 132 and outputs subtitle information. The superimposed text information output from the superimposed text decoder 144 and the subtitle information output from the subtitle decoder 145 are subjected to a synthesis process in the subtitle synthesis unit 146, and further, in the subtitle color gamut conversion unit 147, a color space conversion process is performed as necessary for the video synthesis process in the video synthesis unit 161. In this embodiment, among the services mainly based on text information presented simultaneously with the video of a broadcast program, those related to the content of the video are referred to as subtitles, and the rest are referred to as superimposed text. Furthermore, when there is no distinction between them, they are collectively referred to as subtitles.

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

[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 the like, and performs processing such as selection and / or superimposition as appropriate. The video synthesis unit 161 includes a video RAM (not shown), and the monitor unit 162 and the like are driven based on the video information and the like input to the video RAM. The video synthesis unit 161 also performs scaling processing and superimposition processing of EPG (Electronic Program Guide) screen information created based on information such as MH-EIT included in MMT-SI, as necessary, based on the control of the main control unit 101. The monitor unit 162 is 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 provided with a logical plane structure in order to display the multimedia service as intended by the provider. FIG. 7B shows an example of the configuration of the logical plane structure provided by the presentation function of the broadcast receiving device 100 of this embodiment. In the logical plane structure, a character superimposition plane for displaying character superimposition is arranged in the foreground, and a subtitle plane for displaying subtitles is arranged in the next layer. A multimedia plane for displaying broadcast video, multimedia applications, or composite video thereof is arranged in the third layer, and a background plane is arranged in the background. In the subtitle synthesis unit 146 and the video synthesis unit 161, drawing of character superimposition information on the character superimposition plane, drawing of subtitle information on the subtitle plane, drawing of video information, application information, etc. on the multimedia plane are performed. In addition, a background color is drawn on the background plane based on the LCT, etc. included in the MMT-SI. It is assumed that a plurality of multimedia planes in the third layer can be prepared according to the number of video decoders 141. However, even if there are a plurality of multimedia planes, application information, etc. output from the application color gamut conversion unit 155 is output only to the foreground multimedia plane.

[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 selected and / or mixed by the audio synthesis unit 164 to the user of the broadcast receiving device 100. The audio output unit 166 is an audio output interface that outputs the audio information selected and / or mixed by the audio synthesis unit 164.

[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 an external video / audio output device, outputs analog video signals / audio signals to an external video / audio input device, etc. The USB interface connects to a PC or the like to send and receive data. A HDD may be connected to record broadcast programs and content. A keyboard or other USB device may also be connected. The memory interface connects to a memory card or other memory medium to send and receive data.

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

[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 output or input data in the form of serial data conforming to the IEEE1394 specification, or the like. It may also be configured as an IP interface that performs digital interface output via hardware such as Ethernet (registered trademark) or wireless LAN. In this case, the digital interface unit 125 and the LAN communication unit 121 may share the same hardware configuration.

[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 used. The operation input unit 170 may also be replaced by a touch panel that is placed over the monitor unit 162. It may also be replaced by a keyboard or the like connected to the extended interface unit 124. The remote control (not shown) may also be replaced by a mobile information terminal 700 equipped with a remote control command transmission function.

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

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

[0148] In addition, when the system clock is set to a frequency of a power of 2 such as "2 to the power of 24" to "2 to the power of 28" on the broadcast transmission system side or the receiver side as described above, the lower 8 to 4 bits in the NTP timestamp format transmitted from the broadcast transmission system side to the receiver side, which are not referenced by the PLL (Phase Locked Loop) system for regenerating the system clock or the NTP format clock, may be fixed to "0" or "1". In other words, if the system clock is "2 to the power of n" Hz (n=24 in the example of FIG. 7C), the lower "32-n" bits of the NTP timestamp format may be fixed to "0" or "1". Alternatively, the receiver side may process the lower "32-n" bits of the NTP timestamp format to be ignored.

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

[0150] The receiver side receives the time information in the NTP long format via the broadcast transmission path, and regenerates the receiving system clock by a PLL system based on a VCO of "2 to the power of n" Hz, just like the broadcast transmission system side. As a result, the receiving system clock becomes a clock synchronized with the broadcast transmission system side. In addition, by operating the signal processing system of the receiver in synchronization with the system clock of "2 to the power of n" Hz, clock synchronization between the broadcast transmission system side and the receiver side is realized, and stable signal reproduction is possible. In addition, the decoding time and presentation time for each presentation unit of the video / audio signal are set on the broadcast transmission system side based on the time information in the NTP format. Here, the MPT stored in the PA message transmitted by the broadcast signal stores the MPU timestamp descriptor shown in FIG. 13B described later. The "mpu_sequence_number (MPU sequence number)" parameter in the MPU timestamp descriptor in FIG. 13B indicates the sequence number of the MPU that describes the timestamp, and the "mpu_presentation_time (MPU presentation time)" parameter indicates the presentation time of the MPU in 64-bit NTP timestamp format. Therefore, the receiver can refer to the MPU timestamp descriptor stored in the MPT and control the presentation (display, output, etc.) timing of video signals, audio signals, subtitles, superimposed text, etc. for each MPU.

[0151] In addition, when focusing on the control of the decoding timing and presentation timing for each presentation unit of the above-mentioned video / audio signals, the synchronization of the video / audio signals can be ensured even with a clock of about 2 to the power of 16 Hz (approximately 65.5 KHz), and in this case, it is not necessary to refer to the lower 16 bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. In other words, if a clock of 2 to the power of m Hz generated by dividing the system clock, etc. is used to control the decoding timing and presentation timing, it is not necessary to refer to the lower 32-m bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. Therefore, the lower 32-m bits of the NTP timestamp format described in the MPU timestamp descriptor, etc. may be fixed to 0 or 1.

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

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

[0154] In the following, for the sake of simplicity, the process of controlling each operation block by the main control unit 101 expanding the basic operation program 1001 stored in the ROM 103 into the RAM 104 and executing it will be described as the basic operation execution unit 1101 controlling each operation block. Similar descriptions will be used for the other operation programs.

[0155] The receiving function execution unit 1102 controls each operation block of the broadcast receiving device 100 to reproduce components such as video and audio transmitted in the broadcasting system of this embodiment. In particular, the transport processing unit 1102a mainly controls the MMT decoder function of the separation unit 132, and distributes the video data string and audio data string separated from the MMT data string to the corresponding decoding processing units. The AV decoding processing unit 1102b mainly controls the video decoder 141, the audio decoder 143, etc. The application processing unit 1102c mainly controls the cache unit 152, the application control unit 153, the browser unit 154, and the sound source unit 156. The superimposed text processing unit 1102d mainly controls the superimposed text decoder 144. The subtitle processing unit 1102e mainly controls the subtitle decoder 145. The general-purpose data processing unit 1102f mainly controls the data decoder 151. The EPG generation unit 1102g interprets the description contents of the MH-EIT etc. included in the MMT-SI to generate an EPG screen. The presentation processing unit 1102h mainly controls the video color gamut conversion unit 142, the subtitle synthesis unit 146, the subtitle color gamut conversion unit 147, the application color gamut conversion unit 155, the video synthesis unit 161, and the audio synthesis unit 164 based on the logical plane structure.

[0156] The operation programs may be stored in the ROM 103 and / or the storage (accumulation) unit 110 beforehand at the time of product shipment. After product shipment, the operation programs may be acquired from another application server 500 or the like on the Internet 200 via the LAN communication unit 121. Moreover, the operation programs may be stored in a memory card, an optical disk, or the like and acquired via the expansion interface unit 124 or the like.

[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 in 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 sending program 3003, and further includes a broadcast content storage area 3200 and a metadata storage area 3300. The broadcast content storage area 3200 stores program content and the like of each broadcast program broadcast by a broadcast station. The metadata storage area 3300 stores metadata such as the program title, program ID, program summary, cast, broadcast date and time, and copy control information related to each program content of each of the broadcast programs.

[0160] In addition, the basic operation program 3001, broadcast content management / distribution program 3002, and broadcast content transmission program 3003 stored in the storage unit 310 are each expanded into RAM 304, and the main control unit 301 executes each of the expanded programs to form a basic operation execution unit 3101, a broadcast content management / distribution execution unit 3102, and a broadcast content transmission execution unit 3103.

[0161] In the following, for ease of explanation, the process in which the main control unit 301 loads the basic operation program 3001 stored in the storage unit 310 into the RAM 304 and executes it to control each operation block will be described as being performed by the basic operation execution unit 3101. Similar descriptions will be used for the other operation programs.

[0162] The broadcast content management / distribution execution unit 3102 manages the program contents and each metadata of each broadcast program stored in the broadcast content storage area 3200 and the metadata storage area 3300, and controls the provision of the program contents and each metadata of each broadcast program to the service provider based on a contract. Furthermore, when providing the program contents and each metadata of each broadcast program to the service provider, the broadcast content management / distribution execution unit 3102 may perform authentication processing of the service provider server 400 based on the contract as necessary.

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

[0164] The LAN communication unit 321 is connected to the Internet 200, and communicates with a service provider server 400 on the Internet 200, etc. The LAN communication unit 321 is equipped with an encoding circuit, a decoding circuit, etc. The digital broadcast signal transmission unit 360 modulates an MMT data sequence composed of video data sequences, audio data sequences, program information data sequences, etc. of program contents of each broadcast program stored in the broadcast content storage area 3200, and transmits it as a digital broadcast wave via the radio tower 300t.

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

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

[0170] The video content management / distribution execution unit 4102 acquires program contents and metadata of broadcast programs from the broadcast station server 300, manages the video contents and metadata stored in the video content storage area 4200 and the metadata storage area 4300, and controls the distribution of the video contents and metadata to each television receiver. Furthermore, the video content management / distribution execution unit 4102 may perform authentication processing of each television receiver as necessary when distributing the video contents and metadata to each television receiver. Furthermore, the application management / distribution execution unit 4104 manages applications stored in the application storage area 4400 and controls the distribution of each application in response to a request from each television receiver. Furthermore, the application management / distribution execution unit 4104 may perform authentication processing of each television receiver as necessary when distributing the applications to each television receiver.

[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 includes an encoding circuit, a decoding circuit, and the like.

[0172] [Mobile information terminal hardware configuration] 10A is a block diagram showing an example of the internal configuration of a mobile information terminal 700. The mobile information terminal 700 is composed of a main control unit 701, a system bus 702, a ROM 703, a RAM 704, a storage unit 710, a communication processing unit 720, an expansion interface unit 724, an operation unit 730, an image processing unit 740, an audio processing unit 750, and a sensor unit 760.

[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 in the portable information terminal 700.

[0174] ROM 703 is a memory in which basic operation programs such as an operating system and other operation programs are stored, and a rewritable ROM such as an EEPROM or flash ROM is used. RAM 704 serves as a work area when the basic operation programs and other operation programs are executed. ROM 703 and RAM 704 may be integrated with main control unit 701. ROM 703 may use a part of the storage area in storage unit 710 instead of being an independent configuration as shown in FIG. 10A.

[0175] The storage unit 710 stores the operation program and operation setting values ​​of the mobile information terminal 700, personal information of the user of the mobile information terminal 700, etc. It can also store operation programs downloaded via the Internet 200 and various data created by the operation programs. It can also store content such as video, still images, and audio downloaded via the Internet 200. A part of the area of ​​the storage unit 710 may replace all or part of the functions of the ROM 703. The storage unit 710 needs to hold the stored information even when power is not being supplied from the outside to the mobile information terminal 700. Therefore, for example, devices such as a nonvolatile semiconductor element memory such as a flash ROM or SSD, a magnetic disk drive such as an HDD, etc. are used.

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

[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 made by a wireless connection such as Wi-Fi (registered trademark). The mobile telephone network communication unit 722 performs telephone communication (calls) and transmits and receives data by wireless communication with the base station 600b of the mobile telephone communication network. The NFC communication unit 723 performs wireless communication when in close proximity to a corresponding reader / writer. The LAN communication unit 721, the mobile telephone network communication unit 722, and the NFC communication unit 723 are assumed to each include an encoding circuit, a decoding circuit, an antenna, and the like. The communication processing unit 720 may further include other communication units such as a BlueTooth (registered trademark) communication unit and an infrared communication unit.

[0178] The expansion interface unit 724 is a group of interfaces for expanding the functions of the portable information terminal 700, and in this embodiment, is composed of a video / audio interface, a USB interface, a memory interface, etc. The video / audio interface inputs video signals / audio signals from an external video / audio output device, outputs video signals / audio signals to an external video / audio input device, etc. The USB interface connects to a PC or the like to send and receive data. It may also be used to connect a keyboard or other USB device. The memory interface connects to a memory card or other memory medium to send and receive data.

[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 arranged with button switches. Only one of them may be used. The mobile information terminal 700 may be operated using a keyboard or the like connected to the extended interface unit 724. The mobile information terminal 700 may be operated using a separate terminal device connected by wired or wireless communication. That is, the mobile information terminal 700 may be operated from the broadcast receiving device 100. The touch panel function may be provided in the display unit 741.

[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 a function of performing format conversion, superimposition processing of menus and other OSD (On Screen Display) signals, etc., as necessary. The first image input unit 743 and the second image input unit 744 are camera units that input image data of the surroundings and objects by converting light input from a lens into an electrical signal using an electronic device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor.

[0181] The audio processing unit 750 is composed of an audio output unit 751, an audio signal processing unit 752, and an audio input unit 753. The audio output unit 751 is a speaker, and provides an audio signal processed by the audio signal processing unit 752 to the user of the mobile information terminal 700. The audio input unit 753 is a microphone, and converts the user's voice, etc. into audio data and inputs it.

[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 brightness of the surroundings, the proximity of surrounding objects, and the like. The portable information terminal 700 may further include other sensors, such as an air pressure sensor.

[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 moving images, a portable game machine, a navigation device, or other portable digital devices.

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

[0185] [Mobile information terminal software configuration] 10B is a software configuration diagram of the mobile information terminal 700 of this embodiment, and shows the software configuration in the ROM 703, the RAM 704, and the storage unit 710. In this embodiment, a basic operation program 7001 and other operation programs are stored in the ROM 703, and a linkage control program 7002 and other operation programs are stored in the storage unit 710. The storage unit 710 is also assumed to include a content storage area 7200 for storing content such as moving images, still images, and audio, an authentication information storage area 7300 for storing authentication information and the like required for accessing a television receiver or each server device, and various information storage areas for storing various other information.

[0186] A basic operation program 7001 stored in ROM 703 is loaded onto RAM 704, and the main control unit 701 executes the loaded basic operation program to constitute a basic operation execution unit 7101. Similarly, a cooperative control program 7002 stored in the storage unit 710 is loaded onto RAM 704, and the main control unit 701 executes the loaded cooperative control program to constitute a cooperative control execution unit 7102. The RAM 704 also includes a temporary storage area for temporarily holding data created during execution of each operation program as necessary.

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

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

[0189] The operation programs may be stored in the ROM 703 and / or the storage unit 710 beforehand at the time of product shipment. After product shipment, the operation programs may be acquired from other application servers 500 on the Internet 200 via the LAN communication unit 721 or the mobile telephone network communication unit 722. Moreover, the operation programs may be acquired via the extended interface unit 724 from memory cards, optical disks, or the like.

[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 with reference to Fig. 7C. The second time management function is a time management function based on MH-TOT, and the time is managed based on the time information transmitted by MH-TOT, as explained with reference to Fig. 6B.

[0191] An example of the configuration of time information transmitted by NTP is shown in FIG. 13A. An example of the data structure of the MPU timestamp descriptor is shown in FIG. 13B. The "reference_timestamp" parameter and the "transmit_timestamp" parameter in the NTP format are 64-bit time data in the NTP long format, and the "mpu_presentation_time" parameter in the MPU timestamp descriptor is also 64-bit time data in the NTP timestamp format. The NTP long format time data and the NTP timestamp format time data are data in which "seconds or more" of UTC are expressed in 32 bits and "less than seconds" is expressed in 32 bits. That is, the NTP format time information can transmit time information up to "less than seconds". Furthermore, since the NTP format time information is expressed in UTC notation, it can be consistent with the NTP included in the signal received on the communication line path (for example, the communication line that can be received by the LAN communication unit 121 in FIG. 7A) as shown in FIG. 3(B), unlike the clock management in conventional digital broadcasting.

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

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

[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, for decoding and displaying synchronization processing of video, audio, subtitles, superimposed text, and other presented data, which are the contents of the broadcast signal. Furthermore, by referring to information in UTC notation instead of the clock notation of the broadcast station, it is also possible to perform synchronization processing of decoding and displaying video, audio, subtitles, superimposed text, or other data, which are the contents of the broadcast signal received by the broadcast signal, and video, audio, subtitles, superimposed text, or other data acquired through a communication line path.

[0195] Furthermore, the broadcast receiving device of this embodiment may use the time management function based on "JST_time" including 24-bit information expressed by six 4-bit binary-coded decimal numbers of MH-TOT in the process of presenting the current time to the user or each process that handles the MH-Event Information Table (MH-EIT) described in FIG. 6B. Generally, the process of presenting the current time to the user in the broadcast receiving device rarely requires accuracy to the nearest second. Also, each piece of time information described in the MH-Event Information Table (MH-EIT) is stored in two decimal digits each for "hour," "minute," and "second" as 24-bit information expressed by six 4-bit binary-coded decimal numbers, similar to the EIT of conventional digital broadcasting transmitted by the MPEG2-TS method. For this reason, the time management function based on MH-TOT in the broadcast receiving device 100 of this embodiment is easily compatible with the process that uses the MH-EIT. Specifically, the process that uses the MH-EIT is a program guide generation process (described later), control of recording and viewing reservations, copyright management process such as temporary storage, etc. This is because it is rare for any process to require accuracy below a second, and accuracy on the order of one second is sufficient.

[0196] Moreover, the program guide generation process, the control of recording and viewing reservations, and copyright management processes such as temporary storage are also functions installed in receivers of digital broadcasting systems using the conventional MPEG2-TS format. Then, in the broadcasting system of this embodiment, if the program guide generation process, the control of recording and viewing reservations, and copyright management processes such as temporary storage are configured to be compatible with time management processes consistent with conventional MPEG2-TS format digital broadcasting systems, when configuring a broadcast receiving device having both a function for receiving digital broadcasts using the conventional MPEG2-TS format and a function for receiving digital broadcasts using the MMT format, it will be unnecessary to design separate processing algorithms for these processes (program guide generation process, control of recording and viewing reservations, copyright management processes such as temporary storage, and other processes), and costs can be reduced.

[0197] Furthermore, even if a receiver does not have the ability to receive digital broadcasts using the conventional MPEG2-TS format, and only has the ability to receive digital broadcasts using the MMT format, it is not necessary to create completely new algorithms for processes such as generating a program guide, controlling recording and viewing reservations, and copyright management processes such as temporary storage. Instead, the algorithms for functions that are also installed in receivers for digital broadcasting systems using the conventional MPEG2-TS format can be reused, making it possible to develop them at lower cost.

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

[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 manner consistent with conventional digital broadcasting systems, and the other type of time information is time information with a higher resolution than the one type of time information. By using the latter type of time information for synchronization processing of each content data of a broadcast signal, a more advanced information presentation processing than that of conventional broadcasting systems is realized, and by using the former type of time information for program guide generation processing, recording reservation control and viewing reservation control, copyright management processing such as temporary storage, etc., a broadcast receiving device can be provided at a low cost.

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

[0203] In this case, the information on the expected delay time may be configured to be transmitted not in the TLV multiplexed stream shown in FIG. 3A but in a TMCC (Transmission and Multiplexing Configuration Control) area outside the TLV multiplexed stream. If the information is transmitted in the TMCC area, the broadcast receiving device 100 can extract the information on the expected delay time without undergoing a separation process (demux process) of the TLV multiplexed stream. That is, it is possible to obtain information that is not easily affected by the delay caused by the separation process in the broadcast receiving device 100, and therefore it is possible to perform a highly accurate system clock correction process. An example of the data structure of the time information transmitted by the TMCC signal will be described with reference to FIG. 13C. The time information may be stored in, for example, a TMCC extended information area and transmitted. In the time information in the TMCC extended information area in FIG. 13C, the "delta" parameter represents the expected value of the transmission delay from a time management server that distributes UTC or a server device that creates a TMCC signal to a general broadcast receiving device in a 32-bit signed fixed point number. The upper 16 bits describe the integer part, and the lower 16 bits describe the decimal part. The "transmit_timestamp" parameter is a transmission timestamp, and describes the time when this TMCC signal is sent from the server device in NTP timestamp length format. The upper 32 bits represent the integer part, and the lower 32 bits represent the decimal part.

[0204] In the first variant, the broadcast receiving device 100 of this embodiment can use information regarding the expected delay time described in the time information stored in the TMCC extended information area and transmitted (e.g., the aforementioned ``delta'' parameter and / or ``transmit_timestamp'' parameter) to more accurately correct the system clock of the NTP-based time management function used for synchronization processing of each content data of the broadcast signal.

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

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

[0208] FIG. 12 shows an example of a first calculation method used when the value of MJD is equal to or greater than a predetermined value, and a second calculation method used when the value of MJD is less than the predetermined value. For example, if the predetermined value is "32768 (0x8000)", the first calculation method is used to calculate the current date when MJD is equal to or greater than "32768", and the second calculation method is used to calculate the current date when MJD is less than "32768". Note that the case where MJD is less than "32768" is equivalent to the case where the most significant bit of the 16-bit data of MJD is "0". This makes it possible to express dates after "April 23, 2038" in the broadcast receiving device 100 of this embodiment. However, the predetermined value can be set arbitrarily, and the predetermined value may be set to "16384 (0x4000)", "49152 (0xC000)", etc. The condition for switching the calculation method may be when the most significant 2 bits of the 16-bit data of the MJD are "00" or when the most significant 2 bits of the 16-bit data of the MJD are not "11." If the above-mentioned means is used with the predetermined value set to "32768," it will not be possible to express dates prior to "September 4, 1948," but this will not be a problem in practical use as a television receiver.

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

[0210] In addition, in the broadcasting system of this embodiment, as described above, absolute time in NTP format is transmitted, and the broadcasting receiving device 100 of this embodiment has a time management function based on the NTP. Furthermore, in the broadcasting receiving device 100 of this embodiment, the decoding timing and presentation timing for each presentation unit of the video / audio signal are controlled by referring to the NTP timestamp described in the MPU timestamp descriptor set for each MPU. As described above, the time information in the NTP format has the configuration shown in FIG. 13A. Moreover, the MPU timestamp descriptor has the configuration shown in FIG. 13B.

[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 according to the value of the referenced time data, etc. That is, for example, if the most significant bit of the 64-bit NTP-length format time data is "0", the second calculation method may be used, and if it is not "0", the first calculation method may be used, etc.

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

[0214] In the broadcast receiving device 100 of this embodiment, when scanning channels for initial setting or when rescanning for changing settings, it is possible to store a list of services acquired from the TLV-NIT in a non-volatile memory such as the ROM 103 or the storage unit 110, and further, it is possible to store a list of IP multicast groups corresponding to each of the services as IP related information in the non-volatile memory in association with each of the services. By storing the list of services and the IP related information in a non-volatile memory and making it possible to refer to them at all times, it becomes unnecessary to reacquire the TLV-NIT or AMT when switching channels, etc., and it becomes possible to efficiently acquire broadcast contents.

[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 frequency value (S101). If the tuner / demodulator unit 131 succeeds in locking onto the set frequency value (S102: Yes), the receiving function execution unit 1102 then acquires a TLV-NIT from the received signal (S103).

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

[0218] Next, the receiving function execution unit 1102 acquires an AMT from the received signal (S109), and further acquires a list of IP multicast groups related to each service ID stored in the service list (S110). An example of the data structure of an AMT is shown in FIG. 15D. If the AMT has a list of IP multicast groups related to a plurality of service IDs, the process of S110 is repeated. If there are a plurality of AMTs having lists of IP multicast groups related to different service IDs, the processes of S109 to S110 are repeated. Next, the receiving function execution unit 1102 associates the list of IP multicast groups acquired in the process of S110 with the service ID as IP related information, and stores it in the ROM 103 or the storage unit 110 (updates it when rescanning) (S111).

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

[0221] Through the series of processes described above, the broadcast receiving device 100 of this embodiment creates / updates a list of services (service list) that make up the broadcast network when scanning channels for initial setup or when rescanning to change settings, and at the same time creates / updates a list of IP multicast groups (IP-related information) corresponding to each of the services, and further stores the list in non-volatile memory such as ROM 103 or storage unit 110.

[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 on the table in which the change in the parameter is detected may be automatically updated. However, when the automatic update is performed, it is desirable to notify the user that a rescan has been performed automatically. In addition, the user may be notified that a change has been made in the information in the table, and the user may select whether or not to perform the rescan.

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

[0224] When a user operates a remote control (not shown) to instruct channel switching, the receiving function execution unit 1102 interprets the command sent from the remote control and specifies the service ID of the target service (S201). Next, the receiving function execution unit 1102 starts acquiring the AMT from the signal received by the tuner / demodulator unit 131. If the AMT is successfully acquired within a predetermined time (S202: Yes), the receiving function execution unit 1102 acquires information on a list of IP multicast groups corresponding to the service ID from the acquired AMT (S204). On the other hand, if the AMT is not successfully acquired within the predetermined time (S202: No), the receiving function execution unit 1102 acquires information on a list of IP multicast groups corresponding to the service ID (S204) by referring to IP-related information stored in the ROM 103 or the storage unit 110 (S203). It is also possible to always refer to the IP-related information stored in the ROM 103 or the storage unit 110 without performing the judgment process of S202.

[0225] Next, the reception function execution unit 1102 starts acquiring the TLV-NIT from the received signal of the tuner / demodulator unit 131. If the TLV-NIT is successfully acquired within a predetermined time (S205: Yes), distribution system information for acquiring the IP data flow corresponding to the service ID is acquired from the acquired TLV-NIT (S207). On the other hand, if the TLV-NIT is not successfully acquired within the predetermined time (S205: No), the distribution system information for acquiring the IP data flow corresponding to the service ID is acquired (S207) by referring to a service list stored in the ROM 103 or the storage unit 110 or the like (S206). Note that the determination process of S205 may not be performed, and the service list stored in the ROM 103 or the storage unit 110 or the like may always be referred to. After acquiring the distribution system information in the processing of S207, the receiving function execution unit 1102 then controls the tuner / demodulation unit 131 with the frequency value indicated in the acquired distribution system information, receives the IP data flow corresponding to the service ID (S208), extracts the MMT data string from the received IP data flow, and outputs it to the separation unit 132.

[0226] In the separation unit 132, the transport processing unit 1102a acquires an MMTP packet with a packet ID of "0" from the input MMT data string (S209), and further acquires an MPT included in the acquired MMTP packet (S210). Next, the transport processing unit 1102a refers to the "MMT_package_id_byte" parameter of the acquired MPT, and checks whether the lowest 16 bits of the "MMT_package_id_byte" parameter have the same value as the service ID. In the example of the data structure of the MPT shown in Fig. 17, if the lowest 16 bits of the "MMT_package_id_byte" parameter have the same value as the service ID (S211: Yes), it is determined that the MMTP packet with the packet ID of "0" is an MMTP packet having data of a program corresponding to the service ID, and executes acquisition of an MFU based on information in the acquired MPT (S216).

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

[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, when the data of the program corresponding to the service ID is stored in an MMTP packet with a packet ID other than "0", it is possible to shorten the processing time.

[0229] When the MFU is acquired in the process of S216, the transport processing unit 1102a extracts encoded video data, encoded audio data, etc. from the acquired MFU and outputs them to the video decoder 141, the audio decoder 143, etc. Hereinafter, video / audio decoding processing based on the control of the AV decoding processing unit 1102b and presentation processing based on the control of the presentation processing unit 1102h are performed, but since each of the above processes is well known, detailed explanations will be omitted.

[0230] By the above series of processes, the broadcast receiving device 100 of this embodiment can execute a channel selection (channel switching) operation. In particular, as described with reference to Figs. 14 and 16, when a channel scan is performed during initial setting or when a rescan is performed for changing settings, a service list and IP-related information are created and stored in a non-volatile memory such as the ROM 103 or the storage unit 110 so that they can be referenced at all times, and when a channel is selected (channel switching), the service list and IP-related information stored in the non-volatile memory such as the ROM 103 or the storage unit 110 are referenced, thereby improving the efficiency of the operation during channel selection (channel switching). That is, it is possible to shorten the time from the start of channel selection (channel switching) to the end of channel selection (channel switching) compared to the case where AMT or TLV-NIT is reacquired during channel selection (channel switching).

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

[0233] An example of the allocation of layouts to layout numbers based on the settings of each of the parameters is shown in FIGS. 19A to 19D, along with the setting values ​​of each of the parameters.

[0234] FIG. 19A shows a default layout setting of the broadcast receiving device 100 of this embodiment, and is an example in which only one area is set in the entire screen. FIG. 19B shows an example in which the entire screen is divided into three areas, each of which is designated as "area 0", "area 1" and "area 2". For example, if the number of pixels in the entire screen is 7680 pixels horizontally and 4320 pixels vertically, "area 0" is set in the range of (0,0)-(6143,3455) since the "left_top_pos_x" parameter is "0", the "left_top_pos_y" parameter is "0", the "right_down_pos_x" parameter is "80", and the "right_down_pos_y" parameter is "80". Similarly, "area 1" is set in the range of (6144,0)-(7679,4319), and "area 2" is set in the range of (0,3456)-(6143,4319).

[0235] Fig. 19C is an example of setting three regions like Fig. 19B, but "region 0" is set in the range of (0,0)-(7679,4319), and "region 1" and "region 2" are placed in front of "region 0" according to the setting of the "layer_order" parameter, in the same range as above. Fig. 19D is an example of the case where "region 0" is set in device 0 (default device: broadcast receiving device 100 in this embodiment), and "region 1" is set in device 1 (mobile information terminal 700 in this embodiment).

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

[0237] The fractional part after the decimal point that occurs when dividing the screen according to the set values ​​of the parameters such as "left_top_pos_x" may be rounded up or down. Rounding (or rounding down to the nearest whole number in binary) may also be used. For example, if the number of pixels on the entire screen is 7680 pixels / 4320 pixels vertically, and the "left_top_pos_x" parameter of "area 0" is "0", the "left_top_pos_y" parameter is "0", the "right_down_pos_x" parameter is "51", and the "right_down_pos_y" parameter is "51", "area 0" may be set in the range of (0,0)-(3916,2203) by rounding up, or in the range of (0,0)-(3915,2202) by rounding down. Also, taking into account the macroblocks used in the video compression process, rounding up / down may be performed in units of 8 pixels or 16 pixels. This process makes it possible to efficiently set an area based on the LCT and to efficiently convert the resolution of multimedia content in the area.

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

[0239] 19B is performed according to the description of the LCT, and when a broadcast program image is displayed in "Area 0", and broadcast contents such as program linkage data linked to the broadcast program are displayed in "Area 1" and "Area 2", and the user instructs the display of the EPG screen using a remote control (not shown), the broadcast receiving device 100 of this embodiment returns the screen layout setting to the default setting (i.e., a state in which the same screen layout control as in FIG. 19A is performed) regardless of the description content of the LCT, as shown in FIG. 20A(A), and controls the EPG screen to be displayed on the entire screen. Furthermore, when the user instructs the display of the EPG screen to end, the screen layout control according to the description content of the LCT is re-executed.

[0240] By performing the above-mentioned control, the EPG screen can be displayed larger and easier to view than when the EPG screen is displayed while maintaining area control of the screen layout as shown in Figure 20A (B).

[0241] It should be noted that the above-mentioned exception processing of the screen layout control is not only applied when displaying the EPG screen, but may also be applied when displaying a sub-screen or a dual-screen display of various setting screens of the broadcast receiving device 100 (the recording setting screen in the illustrated example), as shown in FIG. 20B.

[0242] In the case of the recording setting screen shown in FIG. 1A, the display area of ​​the broadcast content is changed from the entire screen to only the sub-screen portion at the bottom right of the screen. Similarly, in the case of the dual-screen display shown in FIG. 1B, the display area of ​​the broadcast content is changed from the entire screen to only the split screen portion at the left middle section of the screen. In either case, the display area for displaying the broadcast content is narrower than when the entire screen is used, so it is not visually preferable to maintain the area control of the screen layout within the display area (i.e., to display multiple broadcast contents simultaneously by dividing the area). Therefore, in the broadcast receiving device 100 of this embodiment, in the above-mentioned situation, only the broadcast content in "Area 0" is selected and displayed in the display area. Note that the broadcast content in "Area 1" or "Area 2" may be selected and displayed depending on the immediately preceding area selection situation.

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

[0244] [EPG display on broadcast receiving device] In the broadcasting system of this embodiment, time-series information on events (so-called programs) included in each service constituting the broadcasting network is transmitted by MH-EIT. FIG. 21 shows an example of the data structure of the MH-EIT of this embodiment. The MH-EIT is identified into two classes by a table ID (corresponding to the "table_id" parameter in the figure), and is capable of indicating information on the current / next event of its own TLV stream and schedule information of each event of its own TLV stream. The broadcast receiving device 100 of this embodiment is capable of acquiring information such as the start time and broadcast time of each event by identifying the event by a service ID (corresponding to the "service_id" parameter in the figure) with reference to the MH-EIT, etc., and creating an EPG screen, and is capable of superimposing the created EPG on video information, etc. in the video synthesis unit 161 and displaying it on the monitor unit 162.

[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 shape with the vertical axis indicating time and the horizontal axis indicating service ID (channel), and displays detailed information of broadcast programs broadcast on each channel in each time period. In addition, the detailed information 162a1 of each broadcast program is mainly composed of a title area 162a2 and a detailed description area 162a3.

[0246] The title area 162a2 displays the program title of the broadcast program and symbols and the like representing the attributes of the broadcast program. The symbols and the like representing the attributes of the broadcast program are, for example, symbols / characters indicating that it is a new program, symbols / characters indicating that it is a rebroadcast program, etc. Alternatively, it may be a symbolized mark of "data" indicating that it supports data broadcasting by a broadcasting service. It may also be a symbolized mark 162a4 of "NetWork" indicating that content, applications, etc. related to the broadcast program can be obtained from a network. Furthermore, the symbols and the like representing the attributes of the broadcast program may be substituted by differentiating the background color of the detailed information 162a1 from others, or by surrounding the display area of ​​the detailed information 162a1 with a thick frame.

[0247] Even if the control information (messages, tables, descriptors, etc.) in the broadcasting system of this embodiment indicates that content, applications, etc. related to the broadcast program can be obtained from the network, if a LAN cable is not connected to the LAN communication unit 121 of the broadcast receiving device 100, or if access to each server device on the network is not possible, the symbol 162a4 of "NetWork" etc. may be controlled not to be displayed.

[0248] In addition, when the broadcast program is a distribution program distributed via the Internet 200 and cannot be acquired only from the broadcast wave, and further, as described above, when the broadcast receiving device 100 is in a state where it cannot access each server device on the network, the detailed information 162b1 displayed on the EPG screen 162b may be controlled to be grayed out as shown in FIG. 22B. That is, the detailed information of the distribution program that cannot be viewed is controlled not to be displayed. In addition, the background color of the detailed information 162b1 may be differentiated from the others as an alternative to the graying out process. When the detailed information 162b1 is selected by operating a remote control not shown, the user may be notified by a pop-up or the like that the broadcast receiving device 100 is in a state where it cannot access each server device on the network, or that the distribution program associated with the detailed information 162b1 cannot be viewed.

[0249] Through the above-mentioned controls, the broadcast receiving device 100 can provide the user with program information for each broadcast program in a format that feels natural to the user, depending on the network connection status.

[0250] [Emergency warning broadcast display on broadcast receiving device] The broadcast receiving device 100 of this embodiment is capable of performing receiving processing of an emergency alert broadcast when the emergency alert broadcast start control signal bit of the TMCC signal contained in the transmission data including the TLV stream changes from "0" to "1."

[0251] The emergency alert broadcast may be provided as a full-screen application or as text information with superimposed text. When the emergency alert broadcast is provided as text information with superimposed text, it is preferable to display the text information of the superimposed text regardless of the state of the broadcast receiving device 100 immediately before receiving the emergency alert broadcast. That is, as shown in FIG. 23, when a user watches a normal broadcast program and receives an emergency alert broadcast while a program screen 162e of the broadcast program is displayed on the monitor unit 162, the text information 162e1 of the emergency alert broadcast is superimposed on the program screen 162e. Similarly, when a user instructs to display an EPG screen and receives an emergency alert broadcast while an EPG screen 162f is displayed on the monitor unit 162, the text information 162f1 of the emergency alert broadcast is superimposed on the EPG screen 162f.

[0252] By the above-mentioned control, in the broadcast receiving device 100 of this embodiment, when an emergency alert broadcast is received, it is possible to avoid missing important text information based on the emergency alert broadcast, even if the user selects and displays an EPG screen, various setting screens, a recorded program list screen, an Internet browser, etc. This control may also be performed on text information of normal superimposed text that is not based on an emergency alert broadcast.

[0253] [Various exception handling] When the broadcast receiving device 100 of this embodiment cannot acquire data outside the TLV stream in the same package, it may perform, for example, exceptional processing such as that described below.

[0254] As described in FIG. 6E, in the broadcast system supported by the broadcast receiving device 100 of this embodiment, the data acquired in the TLV stream and the data acquired through a path other than the TLV stream can be included in the same package based on the location information stored in the MPT (corresponding to "MMT_general_location_info()" in FIG. 17). However, the data transmission path other than the TLV stream indicated by the location information (for example, IPv4 data flow, IPv6 data flow, broadcast MPEG2-TS, etc.) is a receiving function different from the receiving function of the TLV / MMT stream. Therefore, even when the broadcast receiving device 100 is operating, there may be a situation in which data cannot be acquired from these transmission paths, such as a situation in which the receiving function of these transmission paths is not operating, a situation in which the receiving function itself is operating but a relay device or the like is not operating, a situation in which these transmission paths are not connected by wire or wirelessly, or a situation in which the broadcast receiving device 100 is installed in an environment in which these transmission paths cannot be connected in the first place.

[0255] 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 to be included in the same package, the broadcast receiving device 100 of this embodiment may perform, for example, the following operations.

[0256] For example, in the case where the LCT sets multiple regions in the screen as shown in Figures 19B and 19C, and the video included in the TLV stream is displayed in "region 0" and the data acquired in a transmission path other than the TLV stream is displayed in "region 1" and "region 2", and the data of a transmission path other than the TLV stream to be displayed in "region 1" and "region 2" cannot be acquired, the layout display of the multiple regions specified by the LCT may be prohibited. Specifically, even if the LCT is received, the video of the content received in the TLV stream may be displayed in "region 0" of the default layout display shown in Figure 19A, and the layout display of the multiple regions may not be changed to that of Figures 19B and 19C. Furthermore, even if an instruction to change the default layout to the layout indicated by the LCT is input to the operation input unit 170 in Figure 7A in this state, the default layout display shown in Figure 19A may be left as it is, or the display may be switched to another data broadcasting screen, and the layout display of the multiple regions may not be changed to that of Figures 19B and 19C.

[0257] In the case where the LCT sets multiple regions in the screen as shown in Figures 19B and 19C, and the video included in the TLV stream is displayed in "region 0", and data acquired in a transmission path other than the TLV stream is displayed in "region 1" and "region 2", and data of a transmission path other than the TLV stream to be displayed in "region 1" and "region 2" cannot be acquired, another operation example may be to temporarily display the display frame of the multiple regions shown in Figures 19B and 19C indicated by the LCT, display a background color or a predetermined still image in "region 1" and "region 2", and if data of a transmission path other than the TLV stream indicated by the location information of the MPT cannot be acquired even after a predetermined time has elapsed, perform a display switch to return to the default layout display state shown in Figure 19A. In this case, it is preferable to operate so that the program video included in the TLV stream continues to be displayed in "region 0" even when the layout of Figures 19A, 19B, and 19C is changed, since the user's program video itself will continue.

[0258] In addition, when the video of the content received in the TLV stream is displayed in "Area 0" of the default layout display shown in Fig. 19A due to the inability to obtain data of a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2", the operation of various communication functions and various reception functions of the broadcast receiving device 100 of this embodiment may start, or the communication environment and communication status of the various communication functions and the reception environment and reception status of the various reception functions may change, resulting in a situation in which data of a transmission path other than the TLV stream to be displayed in "Area 1" or "Area 2" can be obtained. In this case, the broadcast receiving device 100 of this embodiment may immediately switch from the default layout display shown in Fig. 19A to a layout of multiple areas as shown in Fig. 19B or Fig. 19C shown by the LCT, and may display the video of the content received in the TLV stream in "Area 0", and switch to display data obtained from a transmission path other than the TLV stream in "Area 1" or "Area 2". Alternatively, the layout change may not be performed immediately, but may be performed after an instruction to change the default layout to the layout indicated by the LCT is input from the operation input unit 170.

[0259] [Copyright protection function] In the digital broadcasting system compatible with the broadcast receiving device 100 of this embodiment, by including copy control information in the MPT and transmitting it, the copy control information may be configured to transmit, for example, "unlimited copying permitted" (which may be divided into two types: "unlimited copying permitted and encryption processing required when storing and outputting" and "unlimited copying permitted and encryption processing not required when storing and outputting"), "one generation only permitted", "predetermined number of times of copying permitted" (for example, so-called "dubbing 10" if nine copies permitted and one move permitted), "copy prohibited", etc. of the content referenced by the MPT. In this case, the broadcast receiving device 100 of this embodiment may be configured to control the storage of the content in the storage (storage) unit 110, recording on a removable recording medium, output to an external device, copying to an external device, moving to an external device, etc., according to the copy control information. Note that the target of the storage process may not only be the storage (storage) unit 110 inside the broadcast receiving device 100, but may also include records that have been subjected to protection processing such as encryption processing so that they can be played back only by the broadcast receiving device 100. Specifically, the targets of the storage process include external recording devices and the like that are in a state where recording and playback can be performed only by the broadcast receiving device 100 .

[0260] A specific example of the process based on the copy control information will be described below.

[0261] First, when the copy control information included in the MPT indicates "unlimited copying", the broadcast receiving device 100 of this embodiment may perform the processes of storing in the storage unit 110, recording in a removable recording medium, outputting to an external device, copying to an external device, and moving to an external device without any restrictions. However, when "unlimited copying and encryption processing required at the time of storing and outputting" is separated from "unlimited copying and encryption processing not required at the time of storing and outputting", in the case of "unlimited copying and encryption processing required at the time of storing and outputting", the processes of storing in the storage unit 110, recording in a removable recording medium, outputting to an external device, copying to an external device, and moving to an external device may be performed an unlimited number of times, but encryption processing must be performed in all cases.

[0262] Furthermore, when the copy control information included in the MPT indicates "copyable for one generation only", the broadcast receiving device 100 of this embodiment allows for encryption and storage in the storage (accumulation) unit 110, but when outputting the stored content to an external device for viewing, it is encrypted and output together with copy control information of "copy prohibited". However, so-called move processing to an external device (processing in which content is copied to an external device and the content in the storage (accumulation) unit 110 of the broadcast receiving device 100 is made unplayable by erasing processing or the like) is allowed.

[0263] Furthermore, when the copy control information included in the MPT indicates "copyable a specified number of times," the broadcast receiving device 100 of this embodiment is able to encrypt and store the content in the storage (accumulation) unit 110, but when outputting the stored content to an external device for viewing, it is encrypted and output together with copy control information indicating "copy prohibited." However, a predetermined number of copies and move processes to an external device may be possible. In the case of the so-called "dubbing 10" provision, nine copies and one move process to an external device may be performed.

[0264] Furthermore, when the copy control information included in the MPT indicates "copy prohibited", the broadcast receiving device 100 of this embodiment prohibits copying to the storage (accumulation) unit 110. However, when the broadcast receiving device 100 is configured to have a "temporary storage" mode that allows storage in the storage (accumulation) unit 110 only for a predetermined time or a predetermined time specified by control information included in the broadcast signal (for example, by the MH-Expire descriptor shown in FIG. 6D), the content can be temporarily stored in the storage (accumulation) unit 110 even when the copy control information included in the MPT indicates "copy prohibited". When the content whose copy control information included in the MPT is "copy prohibited" is output for viewing on an external device, the content is encrypted and output together with the copy control information of "copy prohibited".

[0265] The output for viewing to the external device described above may be performed via video output unit 163 and audio output unit 166 in Fig. 7A, or via digital I / F unit 125, LAN communication unit 121, etc. The copy or move process to the external device described above may be performed via digital I / F unit 125, LAN communication unit 121, etc. in Fig. 7A.

[0266] According to the above-described process, appropriate content protection can be achieved in accordance with the copy control information associated with the content.

[0267] Furthermore, the copying process to an external device via LAN communication unit 121 of content whose copy control information indicates copy restrictions such as "copyable for one generation only," "copyable a specified number of times," or "copying prohibited" may be permitted only when the IP address of the external device that is the destination of a packet transmitted from broadcast receiving device 100 is in the same subnetwork as the IP address of broadcast receiving device 100, and may be prohibited when the IP address of the external device is outside the same subnetwork as the IP address of broadcast receiving device 100. Content whose copy control information indicates "unlimited copying permitted and encryption processing required when stored and output" may also be handled in the same manner.

[0268] Similarly, the process of storing content whose copy control information indicates copy restrictions such as "copyable for one generation only," "copyable a specified number of times," or "copyable an unlimited number of times and encryption processing required when storing and outputting" in storage unit 110 and then moving the content to an external device via LAN communication unit 121 is only permitted 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.

[0269] In principle, video output and audio output for viewing of the content stored in the storage (accumulation) unit 110 of the broadcast receiving device 100 are possible only when the IP address of the external device, which is the destination of the transmission packet from the broadcast receiving device 100, is in the same subnetwork as the IP address of the broadcast receiving device 100, and are prohibited when the IP address of the external device is outside the same subnetwork as the IP address of the broadcast receiving device 100. However, if the external device is connected within the same subnetwork as the IP address of the broadcast receiving device 100 within a predetermined period of time and is registered (paired) as a device that can be viewed even outside the same subnetwork as the IP address of the broadcast receiving device 100, the external device may be configured to be able to output video and audio for viewing of the content stored in the storage (accumulation) unit 110 of the broadcast receiving device 100 to the external device even if the IP address of the external device is outside the same subnetwork as the IP address of the broadcast receiving device 100. In this case, the video and audio output for viewing is performed by encrypting the content.

[0270] 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.

[0271] Next, as explained in FIG. 6E, in the digital broadcasting system compatible with the broadcast receiving device 100 of this embodiment, due to the location information in the MPT ('MMT_general_location_info()' in FIG. 17), data acquired via a different route (IPv4, IPv6, MPEG2-TS, URL, etc.) from the data acquired via the TLV stream of the broadcast route may be included in the same package and the same event as the data acquired via the TLV stream. In this case, content protection when copy control information is included in the MPT will be explained.

[0272] First, when copy control information is included in the MPT, data included in the same package and the same event in the location information may be controlled according to the copy control information included in the TLV stream, even if the data is obtained via a different route (IPv4, IPv6, MPEG2-TS, URL, etc.) from the data obtained via the TLV stream of the broadcast route. As described above, the copy control status of the content specified by the copy control information can be specified as "unlimited copying" (which may be divided into two types: "unlimited copying and encryption processing required when storing and outputting" and "unlimited copying and no encryption processing required when storing and outputting"), "one generation only copying", "prescribed number of copies" (for example, 9 copies + 1 move is so-called "dubbing 10"), "no copying", etc.

[0273] Here, if the data position indicated by the location information includes MPEG2-TS data transmitted by other digital broadcast signals, the MPEG2-TS data is also associated with copy control information and broadcast in other digital broadcast signals. Then, the question arises as to which information to follow and how to perform copy control of the MPEG2-TS data (whether to follow the copy control information included in the TLV / MMT stream or the copy control information included in the MPEG2-TS).

[0274] In the digital broadcasting system of this embodiment, in order to solve this problem, the broadcast receiving device 100 may perform any one of the following solutions.

[0275] <Example 1> In a first operation example, when copy control information is included in the MPT and data included in the same package and the same event in the location information includes MPEG2-TS data transmitted in another digital broadcast signal, the copy control state indicated by the copy control information included in the TLV stream is given priority over the copy control state indicated by the copy control information included in the MPEG2-TS.

[0276] For example, if the copy control status indicated by the copy control information included in the TLV stream is "one-generation copy permitted" and the copy control status indicated by the copy control information included in the MPEG2-TS is "predetermined number of times copy permitted," even if the data was acquired via a different route (digital broadcast in MPEG2-TS transmission format) from the data acquired in the TLV stream, copy control may be performed as "one-generation copy permitted" content. For example, if the copy control status indicated by the copy control information included in the TLV stream is "unlimited copy permitted" and the copy control status indicated by the copy control information included in the MPEG2-TS is "predetermined number of times copy permitted," even if the data was acquired via a different route (digital broadcast in MPEG2-TS transmission format) from the data acquired in the TLV stream, copy control may be performed as "unlimited copy permitted" content.

[0277] In the case of this operation, data acquired via a route other than the TLV stream can also be put into a copy state as desired for management in the broadcast system supported by the broadcast receiving device 100 of this embodiment.

[0278] <Example 2> In a second operation example, when copy control information is included in the MPT and data included in the same package and the same event in the location information includes MPEG2-TS data transmitted in another digital broadcast signal, the copy control state indicated by the copy control information included in the TLV stream is compared with the copy control state indicated by the copy control information included in the MPEG2-TS, and when the copy control state indicated by the copy control information included in the MPEG2-TS is stricter than the copy control state indicated by the copy control information included in the TLV stream, the MPEG2-TS data is excluded from the content to be processed when storing in the storage unit 110 or the like, recording on a removable recording medium, or outputting from a digital interface.

[0279] In this operation, for data obtained via a route other than the TLV stream, duplication of copy control states on the broadcast receiving device 100 of this embodiment can be eliminated while respecting the original copy control information set in the broadcasting system that transmits the data.

[0280] 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.

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

[0282] In the above description, the copyright protection function of the broadcast receiving device 100 of this embodiment has been described as being performed based on the copy control information included in the MPT. However, the table in which the copy control information is arranged is not limited to the MPT. In addition to the MPT, the copy control information may be arranged and transmitted in the MH-Service Description Table (MH-SDT) or MH-Event Information Table (MH-EIT) described in Fig. 6B, or in other tables, and the broadcast receiving device 100 may perform copyright protection processing according to these.

[0283] According to the present embodiment described above, it is possible to provide a broadcast receiver compatible with MMT digital broadcasting. Example 2

[0284] The following describes a second embodiment of the present invention. The configuration, processing, effects, and the like of this embodiment are the same as those of the first embodiment unless otherwise specified. Therefore, the following mainly describes the differences between this embodiment and the first embodiment, and omits as much as possible the description of the common points to avoid duplication. The following description is given assuming that the broadcast receiving device of this embodiment is a television receiver that supports both the MMT and MPEG2-TS media transport methods.

[0285] [Hardware configuration of broadcast receiving device] 24 is a block diagram showing an example of the internal configuration of a broadcast receiving device 800. The broadcast receiving device 800 is composed of a main control unit 801, a system bus 802, a ROM 803, a RAM 804, a storage unit 810, a LAN communication unit 821, an expansion interface unit 824, a digital interface unit 825, a first tuner / demodulation unit 831, a second tuner / demodulation unit 832, an MMT decoding processing unit 841, an MPEG2-TS decoding processing unit 842, a video synthesis unit 861, a monitor unit 862, a video output unit 863, an audio synthesis unit 864, a speaker unit 865, an audio output unit 866, and an operation input unit 870.

[0286] 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.

[0287] The first tuner / demodulation unit 831 receives the broadcast wave of the broadcast service adopting MMT as the media transport method via an antenna not shown, and tunes (selects) the channel of the service desired by the user based on the control of the main control unit 801. Furthermore, the first tuner / demodulation unit 831 demodulates the received broadcast signal to obtain an MMT data string, and outputs it to the MMT decoding processing unit 841. The second tuner / demodulation unit 832 receives the broadcast wave of the broadcast service adopting MPEG2-TS as the media transport method via an antenna not shown, and tunes (selects) the channel of the service desired by the user based on the control of the main control unit 801. Furthermore, the second tuner / demodulation unit 832 demodulates the received broadcast signal to obtain an MPEG2-TS data string, and outputs it to the MPEG2-TS decoding processing unit 842.

[0288] The MMT decode processing unit 841 inputs the MMT data string output from the first tuner / demodulation unit 831, and performs separation processing and decoding processing of the video data string, audio data string, superimposed text data string, subtitle data string, etc., which are real-time presentation elements, based on the control signal included in the MMT data string. The MMT decode processing unit 841 is assumed to have functions equivalent to the separation unit 132, video decoder 141, video color gamut conversion unit 142, audio decoder 143, superimposed text decoder 144, subtitle decoder 145, subtitle synthesis unit 146, subtitle color gamut conversion unit 147, data decoder 151, cache unit 152, application control unit 153, browser unit 154, application color gamut conversion unit 155, sound source unit 156, etc., in the broadcast receiving device 100 of the first embodiment. The MMT decode processing unit 841 is capable of performing various processes described in the first embodiment. The details of the various processes are as described in the first embodiment, so their description will be omitted.

[0289] The MPEG2-TS decoding processor 842 inputs the MPEG2-TS data string output from the second tuner / demodulator 832, and performs separation and decoding processes on the real-time presentation elements such as a video data string, an audio data string, a superimposed text data string, and a subtitle data string based on a control signal included in the MPEG2-TS data string. The MPEG2-TS decoding processor 842 has the same functions as an IRD (Integrated Receiver Decoder) unit of a conventional television receiver that receives broadcast waves of a broadcast service that employs MPEG2-TS as a media transport method, and detailed description thereof will be omitted.

[0290] 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 the monitor unit 862 and the like are driven based on the video information and the like input to the video RAM. The video synthesis unit 861 also performs scaling processing, superimposition processing of EPG screen information, and the like as necessary based on the control of the main control unit 801. The audio synthesis unit 164 receives the audio information output from the MMT decoding processing unit 841 and the audio information output from the MPEG2-TS decoding processing unit 842, and performs processing such as appropriate selection and / or mixing.

[0291] The LAN communication unit 821 is connected to the Internet 200 via the router device 200r, and transmits and receives data to and from each server device and other communication devices on the Internet 200. It also acquires an MMT data sequence (or a part thereof) or an MPEG2-TS data sequence (or a part thereof) of a program transmitted via a communication line, and outputs the data to an MMT decoding processing unit 841 or an MPEG2-TS decoding processing unit 842 as appropriate.

[0292] [Time display on broadcast receiving device] In the broadcast receiving device 800 of this embodiment, the current date and the current time can be displayed on the EPG screen, various setting screens, etc. The information on the current date and the current time is transmitted by MH-TOT or the like in a broadcast service that employs MMT as a media transport method, and is transmitted by TOT (Time Offset Table) or the like provided in SI (Service Information) defined in the MPEG-2 system in a broadcast service that employs MPEG2-TS as a media transport method. The broadcast receiving device 800 can acquire the information on the current date and the current time by referring to the MH-TOT or the TOT.

[0293] In general, when the video synthesis unit 861 mainly selects video information, etc. output from the MMT decoding processing unit 841, the information relating to the current date and current time obtained from the MH-TOT is superimposed on the video information, etc., and when the video synthesis unit 861 mainly selects video information, etc. output from the MPEG2-TS decoding processing unit 842, the information relating to the current date and current time obtained from the TOT is superimposed on the video information, etc.

[0294] However, since there are differences in encoding / decoding processes and transmission paths between a broadcast service that adopts MMT as a media transport method and a broadcast service that adopts MPEG2-TS as a media transport method, there is a possibility that inconsistency may occur, particularly in the current time display, when a broadcast service that adopts MMT as a media transport method is selected and when a broadcast service that adopts MPEG2-TS as a media transport method is selected. For example, as shown in Fig. 25, when the screen display is switched from an EPG screen 162g that displays channel information of a broadcast service that adopts MMT as a media transport method to an EPG screen 162h that displays channel information of a broadcast service that adopts MPEG2-TS as a media transport method, the display of the current time is switched from a current time display 162g1 to a current time display 162h1, which may cause the user to feel visual discomfort due to the inconsistency.

[0295] In the broadcast receiving device 800 of this embodiment, in order to prevent the user from feeling visual discomfort, even when the video synthesis unit 861 mainly selects the video information, etc. output from the MMT decoding processing unit 841, the broadcast receiving device 800 controls so that information related to the current date and current time acquired from the TOT is superimposed on the video information, etc. In other words, the broadcast receiving device 800 controls so that current time information provided by a broadcast service that adopts MPEG2-TS as a media transport method is superimposed on the content of the broadcast service that adopts MMT as a media transport method.

[0296] By performing the above control, the broadcast receiving device 800 of this embodiment always refers to the TOT when displaying the current time and displays the acquired current time information. Therefore, even when switching between a broadcast service that employs MMT as the media transport method and a broadcast service that employs MPEG2-TS as the media transport method, it is possible to prevent the user from feeling visual discomfort due to inconsistency in the display of the current time.

[0297] 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 the broadcast receiving device 800 is in a state where it is possible to receive a broadcast service that employs MPEG2-TS as the media transport method, it always refers to the TOT to acquire current time information, and only when it is not possible to receive a broadcast service that employs MPEG2-TS as the media transport method and it is possible to receive a broadcast service that employs MMT as the media transport method, it controls to acquire current time information by referring to the MH-TOT.

[0298] In addition, the same effect as described above can be obtained by controlling the content of a broadcast service that uses MPEG2-TS as the media transport method to be superimposed with current time information provided by a broadcast service that uses MMT as the media transport method, in the opposite manner to the above-mentioned control.

[0299] As described above, in either case, whether the current time information provided by a broadcast service that adopts MPEG2-TS as the media transport method is controlled to be superimposed on the content of a broadcast service that adopts MMT as the media transport method, or the current time information provided by a broadcast service that adopts MMT as the media transport method is controlled to be superimposed on the content of a broadcast service that adopts MPEG2-TS as the media transport method, the current time information can be corrected by referring to the “delta” parameter of the time information in the TMCC extended information area, as explained in [Time management of broadcast receiving device] in Example 1.

[0300] In addition, in both cases 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 constituting the network may contain an error due to a malfunction of the transmitting system, a transmission error, etc. In the broadcast receiving device 800 of this embodiment, as a countermeasure against the MH-TOT or TOT error, when it is determined that the MH-TOT or TOT acquired from the service being received contains an error, the broadcast receiving device 800 has a function of acquiring the MH-TOT or TOT from another broadcast service in the same network or from an arbitrary broadcast service in another network, and performing a process of updating the time information of the built-in clock by referring to the current time information.

[0301] 26B shows an example of a current time information update process when a broadcast service using MPEG2-TS as a media transport method is received in the broadcast receiving device 800 of this embodiment. Note that even when a broadcast service using MMT as a media transport method is received, the same process as shown in the figure is possible.

[0302] 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 being received broadcast service (broadcast service that employs MPEG2-TS as the media transport method) (S301), and further acquires the 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.

[0303] 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 string of another broadcasting service in the same network, or acquires an MH-TOT from an MMT data string of an arbitrary broadcasting service (broadcasting service that adopts MMT as a media transport method) of another network (S304), and further acquires current time information from the acquired TOT or MH-TOT (S305). The reception function execution unit 1102 may then perform the comparison process of S303 again using the current time information acquired in the process of S305.

[0304] Through the above processing, when the broadcast receiving device 800 of this embodiment determines that the MH-TOT or TOT acquired from the service being received contains an error, it becomes possible to acquire the MH-TOT or TOT from another broadcast service on the same network, or from any broadcast service on another network, and perform update processing of the time information of the built-in clock by referring to the current time information.

[0305] If the process of S304 to S305 is repeated and current time information whose difference with the time information of the built-in clock falls within a predetermined range cannot be obtained, such as during initial setting after shipping from the factory, the time information of the built-in clock can be set again using the current time information obtained in the process of 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.

[0306] [EPG display on broadcast receiving device] Event schedule information of a broadcast service that adopts MMT as a media transport method is transmitted by MH-EIT, etc. Meanwhile, event schedule information of a broadcast service that adopts MPEG2-TS as a media transport method is transmitted by EIT (Event Information Table) etc. provided in SI defined in the MPEG-2 system. Therefore, generally, when video information provided by a broadcast service that adopts MMT as a media transport method is displayed, the event schedule information (MH-EIT) of the broadcast service that adopts MMT can be acquired, and when video information provided by a broadcast service that adopts MPEG2-TS as a media transport method is displayed, the event schedule information (EIT) of the broadcast service that adopts MPEG2-TS can be acquired.

[0307] 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.

[0308] 27A shows an example of an EPG screen in the broadcast receiving device 800 of this embodiment. In the figure, the EPG screen 162i is an EPG screen created based on the MH-EIT of a broadcast service that adopts MMT as a media transport method, and "M1 TV", "M2 Broadcast", "M3 Channel", "M4TV", "TV M5", etc. are the broadcast station names of the broadcast service that adopts MMT as a media transport method. Also, the EPG screen 162j is an EPG screen created based on the EIT of a broadcast service that adopts MPEG2-TS as a media transport method, and "T6 TV", "T7 Broadcast", "T8 Channel", "T9TV", "TV TA", etc. are the broadcast station names of the broadcast service that adopts MPEG2-TS as a media transport method.

[0309] For example, when a user is watching a broadcast program provided by a broadcast service that employs MMT as a media transport method and instructs to display an EPG screen by operating a remote control (not shown), an initial screen of the EPG screen (not shown) is displayed. The initial screen of the EPG screen is an EPG screen created based on the MH-EIT of the broadcast service that employs MMT as a media transport method, and displays detailed information on broadcast programs on each channel from 17:00 (nearby the current time) on October 7, 2014 (today). Next, if the user wishes to check detailed information on broadcast programs on each channel from 20:00 on October 9, 2014, and instructs to update the EPG screen by operating a remote control (not shown), an EPG screen 162i is displayed.

[0310] Furthermore, if the user wishes to check detailed information on a broadcast program provided by a broadcast service that employs MPEG2-TS as a media transport method and instructs to switch the network by operating a remote control (not shown), the EPG screen 162j is displayed. At this time, the broadcast receiving device 800 of this embodiment controls to display detailed information on the broadcast programs of each channel on the same day and in the same time slot (i.e., from 20:00 on October 9, 2014) as the EPG screen 162i that was displayed immediately before, instead of the initial screen of the EPG screen (i.e., detailed information on the broadcast programs of each channel from 17:00 on October 7, 2014) created based on the EIT of the broadcast service that employs MPEG2-TS as a media transport method.

[0311] The above-mentioned control enables the user to continuously check detailed information about broadcast programs on the same day and at the same time on multiple networks using different media transport methods with a simple operation. In other words, the usability of the broadcast receiving device 800 is improved.

[0312] Fig. 27B is a diagram showing an example of an EPG screen in the broadcast receiving device 800 of this embodiment that is different from the above. The EPG screen 162k shows a state where the EPG screen 162i shown in Fig. 27A is scrolled in the channel direction (horizontal direction) by operating a remote control (not shown). That is, in the example shown in Fig. 27B, by scrolling the EPG screen in the channel direction (horizontal direction), channel information created based on the MH-EIT of a broadcast service that employs MMT as a media transport method and channel information created based on the EIT of a broadcast service that employs MPEG2-TS as a media transport method are seamlessly displayed on the same time axis.

[0313] Therefore, even if a user desires to check channel information created based on the EIT of a broadcast service that adopts MPEG2-TS as a media transport method while checking channel information created based on the MH-EIT of a broadcast service that adopts MMT as a media transport method, it is possible to eliminate the need to instruct network switching by operating a remote control (not shown). Furthermore, the user can simultaneously check detailed information about broadcast programs on the same day and at the same time on multiple networks that use different media transport methods. In other words, the usability of the broadcast receiving device 800 is improved. Example 3

[0314] The following describes the third embodiment of the present invention. The configuration and effects of the third embodiment are the same as those of the first embodiment unless otherwise specified. Therefore, the following mainly describes the differences between the first embodiment and the third embodiment, and omits descriptions of common points as much as possible to avoid duplication.

[0315] The broadcast receiving device 100 of this embodiment is capable of supporting HDR (High Dynamic Range), which is a technology for expanding the luminance range of colors in video content, and expanding the color gamut. In addition, MMT, which is a media transport method supported by the broadcast receiving device 100 of this embodiment, is capable of transmitting content information related to the HDR and color gamut expansion together with the encoded data of the program content, in order to enable video reproduction as intended by the content producer on a monitor device (such as the broadcast receiving device 100 of this embodiment) used by a user.

[0316] [System Configuration] The system configuration in this embodiment is basically the same as the system configuration shown in Fig. 1. The coded data of the program content included in the broadcast wave sent from the radio tower 300t may be the content data output from the photographing device 390c that is appropriately coded and modulated without being temporarily stored in the broadcasting station server 300, as shown in Fig. 28. Alternatively, the content data output from the photographing device 390c may be stored in the broadcasting station server 300, and the stored content data may be edited in various video / audio ways by the editing device 390e, and further may be appropriately coded and modulated before being sent.

[0317] In addition to the coded data and text information of the program content, other applications, general-purpose data, etc., content information descriptors that describe information regarding the luminance information of the program content and the color reproduction performance of the equipment (the camera equipment 390c, the monitor device of the editing equipment 390e, etc.) used in creating / editing the program content are transmitted in the broadcast waves as control information (content information) regarding the program content, together with each message / table / descriptor of the MMT-SI described above.

[0318] [Data structure of content information descriptor] An example of the data structure of the content information descriptor is shown in Figure 29A. The content information descriptor may be placed in the MPT or MH-EIT. Each parameter in the data structure of the content information descriptor has the function described below.

[0319] "descriptor_tag" The descriptor tag is a 16-bit field that has the function of uniquely identifying each descriptor.

[0320] "descriptor_length" The descriptor length indicates the total number of data bytes of each parameter that follows this field.

[0321] "component_tag" The component tag is a label for uniquely identifying a component stream and is described in a 16-bit field. It shall have the same value as the component tag described in the MH-stream identification descriptor.

[0322] "content_type" The content type indicates the type of video content included in the component stream according to FIG. 29B. When this parameter is "0", it indicates that the video content is video edited and processed by the editing device 390e (recorded program, etc.). When this parameter is "1", it indicates that the video content is video edited and processed by the editing device 390e (recorded program, etc.) and that this content is HDR compatible. When this parameter is "2", it indicates that the video content is content data output from the image capture device 390c (live broadcast program, etc.). When this parameter is "3", it indicates that the video content is content data output from the image capture device 390c (live broadcast program, etc.) and that this content is HDR compatible. Furthermore, other classifications may be made using this parameter.

[0323] · 『source_primaries_rx (source device primary color chromaticity coordinates (Rx))』 “source_primaries_ry (source device primary color chromaticity coordinates (Ry))” "source_primaries_gx (source device primary color chromaticity coordinates (Gx))" “source_primaries_gy (source device primary color chromaticity coordinates (Gy))” "source_primaries_bx (source device primary color chromaticity coordinates (Bx))" “source_primaries_by(source device primary color chromaticity coordinates (By))”

[0324] The source device primary chromaticity coordinates are parameters indicating information on the color reproduction performance of the source device, and indicate the color gamut that the source device can handle by the coordinate values ​​of each of the primary colors R (red), G (green), and B (blue) on the CIE chromaticity diagram (CIExy chromaticity diagram). Note that the source device is the monitor device of the editing device 390e when the "content_type" parameter is "0" or "1". In this case, the source device primary chromaticity coordinates indicate the chromaticity coordinate values ​​of the color gamut that can be displayed on the monitor device of the editing device 390e. Also, when the "content_type" parameter is "2" or "3", the source device is the imaging device 390c. In this case, the source device primary chromaticity coordinates indicate the chromaticity coordinate values ​​of the color gamut that can be output by the imaging device 390c.

[0325] Each coordinate value on the CIE chromaticity diagram is represented by a value in the range of "0.000" to "1.000", and is described in a 10-bit field in the range of "0000000000b" to "1111101000b". For example, as shown in Fig. 29C, the chromaticity coordinate values ​​of R (red) in the BT.709 standard are "x = 0.640 (1010000000b)" and "y = 0.330 (0101001010b)", and the chromaticity coordinate values ​​of G (green) in the BT.2020 standard are "x = 0.170 (0010101010b)" and "y = 0.797 (1100011101b)".

[0326] · 『source_white_point_x(source device white chromaticity coordinate (x))』 "source_white_point_y(source device white chromaticity coordinate (y))" The source device white chromaticity coordinates are parameters indicating information on the color reproduction performance, etc., of the source device, and indicate the coordinate values ​​on the CIE chromaticity diagram of the white reference point that the source device can handle. Note that, when the "content_type" parameter is "0" or "1", the source device is the monitor device of the editing device 390e. In this case, the source device white chromaticity coordinates indicate the chromaticity coordinate values ​​of the white reference point of the monitor device of the editing device 390e. Also, when the "content_type" parameter is "2" or "3", the source device is the imaging device 390c. In this case, the source device white chromaticity coordinates indicate the chromaticity coordinate values ​​of the white reference point that the imaging device 390c can output.

[0327] Each coordinate value on the CIE chromaticity diagram is represented by a value in the range of "0.0000" to "1.0000", and is described in a 14-bit field in the range of "000000000000000b" to "10011100010000b". For example, as shown in Fig. 29C, the chromaticity coordinate values ​​of the white reference point in the BT.709 standard and the BT.2020 standard are "x=0.3127 (00110000110111b)" and "y=0.3290 (00110011011010b)".

[0328] "source_luminance_max (maximum brightness of source device)" 『source_luminance_min(source device minimum luminance)』 The source device maximum luminance and the source device minimum luminance are parameters indicating information on the maximum luminance and minimum luminance that the source device can handle. When the "content_type" parameter is "0" or "1", the source device is the monitor device of the editing device 390e. In this case, the source device maximum luminance and the source device minimum luminance indicate the maximum and minimum values ​​of luminance that can be displayed on the monitor device of the editing device 390e. When the "content_type" parameter is "2" or "3", the source device is the imaging device 390c. In this case, the source device maximum luminance and the source device minimum luminance indicate the maximum and minimum values ​​of luminance that the imaging device 390c can output.

[0329] The maximum brightness of the source device is 1 (cd / m 2 : candela / square meter) ~ 65535 (cd / m 2 ) and is described in the range of "0000h" to "FFFFh" in a 16-bit field. The minimum luminance of the source device is "0.0001 (cd / m 2 ) to 6.5535 (cd / m 2 ) and is described in the range of "0000h" to "FFFFh" in a 16-bit field.

[0330] "num_of_scene (number of scenes)" The number of scenes indicates the number of scenes (which may be called chapters, etc.) that make up the video content included in the component stream. If the number of scenes is "1", this parameter may be omitted.

[0331] · 『scene_start_time (scene start time)』 The scene start time is a 40-bit field that indicates the start time of a scene (chapter). The upper 16 bits of this field indicate the lower 16 bits of the Modified Julian Date (MJD), and the lower 24 bits indicate the hour, minute, and second of Japan Standard Time (JST) in a six-digit BCD code. If the number of scenes is "1", this parameter may be omitted.

[0332] "scene_duration" The scene duration is a 24-bit field that indicates the duration of a scene (chapter). This field indicates the duration in hours, minutes, and seconds using a six-digit BCD code. If the number of scenes is "1", this parameter may be omitted.

[0333] "max_light_level_of_content" The content maximum luminance is expressed as a 16-bit field that indicates the maximum luminance in each scene (chapter). If the number of scenes is "1", this parameter indicates the maximum luminance throughout the entire content. The content maximum luminance is expressed as "1 (cd / m 2 ) ~ 65535 (cd / m 2 ) and is described in the range of "0000h" to "FFFFh" in a 16-bit field.

[0334] "max_frame_ave_light_level (maximum frame average brightness)" The maximum frame average luminance is expressed as a 16-bit field, which indicates the maximum value of the frame average luminance in each scene (chapter). If the number of scenes is "1", this parameter indicates the maximum value of the frame average luminance throughout the entire content. The maximum frame average luminance is expressed as "1 (cd / m 2 ) ~ 65535 (cd / m 2 ) and is described in the range of "0000h" to "FFFFh" in a 16-bit field.

[0335] "max_light_level_of_frame (maximum brightness within a frame)" The maximum luminance within a frame is expressed as a 16-bit field, which indicates the maximum luminance within each frame. The maximum luminance within a frame is expressed as 1 (cd / m 2 ) ~ 65535 (cd / m 2 ) and is described in the range of "0000h" to "FFFFh" in a 16-bit field.

[0336] "frame_average_light_level (average brightness within a frame)" The average luminance in a frame is expressed as a 16-bit field that indicates the average luminance of each frame. The average luminance in a frame is expressed as 1 (cd / m 2 ) ~ 65535 (cd / m 2 ) and is described in the range of "0000h" to "FFFFh" in a 16-bit field.

[0337] · 『EOTF_identification (EOTF identification)』 The EOTF (Electro-Optical Transfer Function) identification identifies the type of conversion characteristic (transfer characteristic) between electrical signals and optical signals, such as gamma correction applied to the video signal of the video content included in the component stream. For example, in the example shown in FIG. 29D, when this parameter is "0", it indicates that the video content has been subjected to gamma correction suitable for a monitor device with display characteristics conforming to BT.709. When this parameter is "2", it indicates that the video content has been subjected to 10-bit processing gamma correction suitable for a monitor device with display characteristics conforming to BT.2020. When this parameter is "3", it indicates that the video content has been subjected to 12-bit processing gamma correction suitable for a monitor device with display characteristics conforming to BT.2020. When this parameter is "4", it indicates that the video content has been subjected to gamma correction suitable for a monitor device with display characteristics conforming to SMPTE2084. Furthermore, other classifications may be performed using this parameter. Furthermore, the "EOTF identification" parameter may be capable of identifying the type of colorimetry, etc. Note that the types of conversion characteristics (transfer characteristics) between electrical signals and optical signals shown in Figure 29D are just an example, and other conversion characteristics (transfer characteristics) between electrical signals and optical signals may be processed on the video signal of the video content, and the characteristics may be identified using the ``EOTF identification'' parameter.

[0338] Here, the broadcast receiving device 100 that has received the video content and the "EOTF identification" parameter refers to the "EOTF identification" parameter associated with the video content, and further refers to the display characteristics of the monitor device that displays the video content, and performs appropriate electrical-optical conversion and other processing based on the two, thereby making it possible to display each video content in a state suitable for the monitor device. For example, if the transfer characteristics identified by the "EOTF identification" parameter associated with the video content correspond to the display characteristics of the monitor device that displays the video content, the electrical-optical conversion identified by the "EOTF identification" parameter may be performed as is in the display processing. Also, if the transfer characteristics identified by the "EOTF identification" parameter associated with the video content do not correspond to the display characteristics of the monitor device that displays the video content, the electrical-optical conversion identified by the "EOTF identification" parameter may not be performed as is, but rather a conversion process may be performed to convert a video signal that has been subjected to a conversion process between an electrical signal and an optical signal according to the identification of the "EOTF identification" parameter into a video signal suitable for electrical-optical conversion processing corresponding to the display characteristics of the monitor device, and then a display process may be performed to perform electrical-optical conversion corresponding to the display characteristics of the monitor device.

[0339] The conversion process for converting the video signal, which has been subjected to the above-mentioned electrical / optical conversion process according to the identification of the "EOTF identification" parameter, into a video signal suitable for electrical-optical conversion process corresponding to the display characteristics of the monitor device, will be described below. Note that, hereinafter, the above-mentioned process will be referred to as transfer characteristic conversion process.

[0340] Video content with the "EOTF Identification" parameter set to values ​​of "2," "3," or "4" is HDR video content with a wide range of expressible brightness and darkness, color gamut, etc. In contrast, video content with the "EOTF Identification" parameter set to a value of "0" is SDR (Standard Dynamic Range) video content with a narrower range of expressible brightness and darkness, color gamut, etc. than HDR video content.

[0341] Also, a display device with display characteristics conforming to BT.2020 or a display device with display characteristics conforming to SMPTE2084 can be called an HDR-compatible display device. In contrast, a display device with display characteristics conforming to BT.709 can be called an SDR-compatible display device. Furthermore, a display device with display characteristics conforming to BT.709 that does not support HDR display characteristics such as BT.2020 or SMPTE2084 may be called an SDR-compatible display device (HDR non-compatible display device) as a subordinate concept of an SDR-compatible display device.

[0342] Here, when the HDR video content is displayed on an SDR-compatible display device (non-HDR-compatible display device) such as a monitor device with display characteristics conforming to BT.709, if the transfer characteristic conversion process is not performed, the monitor device cannot fully express the wide range of brightness and color gamut of the HDR video content, resulting in a display image that is difficult to see due to brightness collapse and color collapse. That is, in this case, the transfer characteristic conversion process may be performed to convert the wide range of brightness and color gamut of the HDR video content so that it fits within the range of brightness and color gamut that can be expressed by the monitor device. This process may be expressed as a dynamic range reduction conversion of brightness and color gamut reduction conversion. In addition, since this process converts HDR video content with a wide range of brightness and color gamut that can be expressed into SDR video content with a narrow range of brightness and color gamut that can be expressed, it may be expressed as an HDR-SDR conversion process.

[0343] On the other hand, video content having a value of "0" in the "EOTF identification" parameter is SDR video content with a narrow range of expressible brightness and color gamut. When the SDR video content is displayed on an HDR-compatible display device such as a monitor device with display characteristics conforming to BT.2020, if the transfer characteristic conversion process is not performed, the wide brightness display performance and color gamut display performance of the monitor device cannot be fully utilized. That is, in this case, in the transfer characteristic conversion process, a conversion process may be performed on the SDR video content so that the wide brightness display performance and color gamut display performance of the monitor device can be fully utilized. This process may be expressed as a brightness dynamic range expansion conversion or a color gamut expansion conversion. In addition, since this is a process of converting SDR video content with a narrow range of expressible brightness and color gamut into HDR video content with a wide range of expressible brightness and color gamut, it may be expressed as an SDR-HDR conversion process. It should be noted that the SDR-HDR conversion process is not necessarily required, and it is not necessary to perform the SDR-HDR conversion process when displaying the SDR video content on an HDR-compatible display device such as a monitor device with display characteristics conforming to BT.2020. In this case, the brightness and color gamut display performance remains within the range of SDR display characteristics, but the displayed image does not have brightness collapse or color collapse, making it difficult to see, and there is no problem.

[0344] In addition, as an example of processing to be performed when the "EOTF identification" parameter is not associated with the video content received by the broadcast receiving device 100 and cannot be acquired (if it was not originally transmitted), or when the value of the "EOTF identification" parameter associated with the video content received by the broadcast receiving device 100 cannot be acquired and determined due to a transmission error or the like, the following processing may be performed.

[0345] As a first processing example, the value of the "EOTF identification" parameter of the received video content may be treated as, for example, "2" or "3". That is, if the value of the "EOTF identification" parameter cannot be identified, the video content may be treated as HDR video content. In this way, the transfer characteristic conversion process is not performed on an HDR-compatible display device such as a monitor device with display characteristics conforming to BT.2020, but if the actual content is HDR video content, appropriate display is performed, and even if the actual content is SDR video content, the brightness display performance and color gamut display performance remain within the range of SDR display characteristics, but the displayed image is not difficult to see due to luminance crush or color crush. Furthermore, if the monitor device is an SDR-compatible display device (non-HDR-compatible display device) such as a monitor device with display characteristics conforming to BT.709, the transfer characteristic conversion process is performed by treating the video content as HDR video content, but if the actual content is HDR video content, the HDR-SDR conversion process is appropriately performed and displayed, and even if the actual content is SDR video content, the brightness display performance and color gamut display performance are further limited than the range of SDR display characteristics, but at least it is possible to avoid a display image that is difficult to see due to brightness crushing or color crushing that cannot fully express the brightness range or color gamut of the video content. (If the actual content is HDR video content and SDR-HDR conversion process is performed, or if the actual content is HDR video content and the content is displayed as is without HDR-SDR conversion on an SDR-compatible display device (non-HDR-compatible display device), there is a possibility that such a display image that is difficult to see due to brightness crushing or color crushing will be displayed, but this situation can be avoided in the first processing example.)

[0346] According to the first processing example described above, if the value of the "EOTF identification" parameter cannot be identified, the video content is treated as HDR video content, thereby enabling video display with fewer problems for the user, regardless of whether the monitor device is an HDR-compatible display device or an SDR-compatible display device (HDR non-compatible display device), and regardless of whether the actual content is HDR video content or SDR video content.

[0347] As a second processing example for when the value of the "EOTF identification" parameter cannot be obtained (including when it is not transmitted, when there is a transmission error, etc., or when it is an invalid value), it is also possible to refer to parameters related to the resolution of the video signal contained in the video component descriptor, etc., to determine whether to treat it as HDR video content or SDR video content.

[0348] For example, even if the value of the "EOTF identification" parameter cannot be identified, if the parameter related to the resolution of the video signal indicates that the video content is high-resolution content with a resolution of 3840 x 2160 pixels or 7680 x 4320 pixels, it may be determined that the video content is HDR video content. Specifically, the value of the "EOTF identification" parameter can be interpreted as "2" or "3." High-resolution content with 3840 x 2160 pixels or 7680 x 4320 pixels is expected to be prepared and used as HDR video content in the future, so this type of processing makes it easier to display the content in a probabilistically appropriate manner.

[0349] Also, even if the value of the "EOTF identification" parameter cannot be identified, if the parameter related to the resolution of the video signal indicates that the resolution of the video content is 1920 x 1080 pixels or less, it may be determined that the video content is SDR video content. Specifically, the value of the "EOTF identification" parameter can be interpreted as "0." Since there are many existing SDR contents with a resolution of 1920 x 1080 pixels or less, such processing makes it more likely that the video content will be displayed appropriately in a probabilistic manner.

[0350] According to the second processing example described above, when the value of the "EOTF identification" parameter cannot be identified, the parameter related to the resolution is referred to for judgment, so that a probabilistically appropriate display becomes more likely to be performed.

[0351] Next, a process will be described for the case where the value of the "EOTF identification" parameter associated with the video content received by the broadcast receiving device 100 is a value for which no relationship with the display characteristics is provided in the table of Fig. 29D. Here, a value for which no relationship with the display characteristics is provided in the table of Fig. 29D is a case where the value of the "EOTF identification" parameter in the table of Fig. 29D is a value reserved for the future, such as "1" or "5" to "15", or an unexpected value, etc., is stored. These values ​​may be expressed as invalid values. In the case of such invalid values ​​(values ​​for which no relationship with the display characteristics is provided), similar effects can be obtained by performing either the first processing example or the second processing example described above.

[0352] In the configuration diagram of Figure 7A, the various types of image processing according to the ``EOTF identification'' parameters described above can be performed by the image color gamut conversion unit 142 controlled by the main control unit 101 based on the data separated by the separation unit 132.

[0353] Here, when the video content to be displayed switches between HDR video content and SDR video content due to a change in program or channel switching, it is ideal that the timing at which the decoded video from video decoder 141 in Fig. 7A switches between HDR video content and SDR video content coincides with the timing at which the video processing by video gamut conversion unit 142 switches between processing for HDR video content and processing for SDR video content. However, in reality, it is thought that there will be some degree of timing discrepancy.

[0354] In an HDR-compatible display device that performs SDR-HDR conversion processing on SDR video content, if the timing of switching the video processing of the video gamut conversion unit 142 is earlier than the timing of switching the decoded video from the video decoder 141 when switching from HDR video content to SDR video content, there is a possibility that the SDR-HDR conversion processing will be performed on the HDR video content for a period of time, resulting in a display image that is difficult to see due to luminance collapse or color collapse. Therefore, when switching from HDR video content to SDR video content, the main control unit 101 may control the processing timing of the video decoder 141 and the video gamut conversion unit 142 so that the timing of switching the video processing of the video gamut conversion unit 142 is later than the timing of switching the decoded video from the video decoder 141. Alternatively, the video may be put into a video mute state, such as black display, before the switching between the two starts, and the video mute state, such as black display, may be released after the switching between the two is completed.

[0355] In addition, in an HDR-compatible display device that performs SDR-HDR conversion processing on SDR video content, if the timing of switching the video processing of the video gamut conversion unit 142 is delayed compared to the timing of switching the decoded video from the video decoder 141 when switching from the SDR video content to the HDR video content, there is a possibility that the SDR-HDR conversion processing is performed on the HDR video content for a period of time, and a display image that is difficult to view due to luminance collapse or color collapse is displayed. Therefore, when switching from SDR video content to HDR video content, the main control unit 101 may control the processing timing of the video decoder 141 and the video gamut conversion unit 142 so that the timing of switching the video processing of the video gamut conversion unit 142 is earlier than the timing of switching the decoded video from the video decoder 141. Alternatively, the video may be put into a video mute state, such as black display, before the switching between the two starts, and the video mute state, such as black display, may be released after the switching between the two is completed.

[0356] In an SDR-compatible display device that performs HDR-SDR conversion processing on HDR video content and displays SDR video content without performing transfer characteristic conversion processing, if the timing at which the video processing of video gamut conversion unit 142 switches is earlier than the timing at which the decoded video from video decoder 141 switches when switching from HDR video content to SDR video content, there will be a period of time during which the HDR video content is displayed on the SDR-compatible display device as is without performing transfer characteristic conversion processing, and there is a possibility that a display image that is difficult to view due to luminance crushing or color crushing will be displayed. Therefore, when switching from HDR video content to SDR video content, main control unit 101 should control the processing timing of video decoder 141 and video gamut conversion unit 142 so that the timing at which the video processing of video gamut conversion unit 142 switches is later than the timing at which the decoded video from video decoder 141 switches. Alternatively, the video may be muted, for example by displaying black video, before the switching between the two starts, and the video may be muted, for example by displaying black video, after the switching between the two is completed.

[0357] In an SDR-compatible display device that performs HDR-SDR conversion processing on HDR video content and displays SDR video content without performing transfer characteristic conversion processing, if the timing at which the video processing of video gamut conversion unit 142 switches is later than the timing at which the decoded video from video decoder 141 switches when switching from SDR video content to HDR video content, there will be a period of time during which the HDR video content is displayed on the SDR-compatible display device as is without performing transfer characteristic conversion processing, and there is a possibility that a display image that is difficult to view due to luminance crushing or color crushing will be displayed. Therefore, when switching from SDR video content to HDR video content, main control unit 101 should control the processing timing of video decoder 141 and video gamut conversion unit 142 so that the timing at which the video processing of video gamut conversion unit 142 switches is earlier than the timing at which the decoded video from video decoder 141 switches. Alternatively, the video may be muted, for example by displaying black video, before the switching between the two starts, and the video may be muted, for example by displaying black video, after the switching between the two is completed.

[0358] As described above, by performing processing related to the timing of switching the decoded image and the timing of switching the transfer characteristic conversion process, it is possible to avoid presenting the user with a display image that is difficult to view due to luminance loss or color loss.

[0359] Instead of or in addition to the above-described identification process and various video processes using the 'EOTF_identification' parameter in the content information descriptor, a flag that enables the same identification as the above-described 'EOTF_identification' parameter may be inserted into the coded video stream, and the identification process and various video processes may be performed using the inserted flag. The identification process and various video processes when the 'EOTF_identification' flag is used as a flag in the coded video stream may be performed by referring to the 'EOTF_identification' flag inserted in the coded video stream instead of referring to the 'EOTF_identification' parameter in the content information descriptor in the description of the above-described identification process and various video processes when the 'EOTF_identification' parameter in the content information descriptor is used, and therefore a detailed description thereof will be omitted.

[0360] However, if the "EOTF_identification" flag as a flag in the encoded video stream is inserted in the encoded video stream, for example, on a frame-by-frame or GOP-by-GOP basis, it becomes possible to switch between HDR video content and SDR video content and switch between various video processes corresponding to each video content in finer time units than when the "EOTF_identification" parameter in the content information descriptor set on an asset-by-asset or program-by-program basis is used. That is, the video decoder 141 can grasp the switching between HDR video content and SDR video content on a frame-by-frame or GOP-by-GOP basis, and further the downstream video gamut conversion unit 142 can refer to the identification information of the HDR video content and the SDR video content on a frame-by-frame or GOP-by-GOP basis, which has the effect of improving the synchronization accuracy of the switching timing of the video processes in the video gamut conversion unit 142 compared to when the "EOTF_identification" parameter in the content information descriptor is used.

[0361] Furthermore, when using both the transmission of the 'EOTF_identification' flag in the encoded video stream and the transmission of the 'EOTF_identification' parameter in the content information descriptor, the identification process using the 'EOTF_identification' flag in the encoded video stream can be used to switch the video processing of the video gamut conversion unit 142, and the 'EOTF_identification' parameter in the content information descriptor can be used for display purposes, for example, to inform the user whether a program is an HDR video content program or an SDR video content program when displaying the program information or on a program-by-program basis in a program guide, thereby making it possible to more appropriately use the two types of identification information.

[0362] In addition, when the transmission of the 'EOTF_identification' flag in the encoded video stream and the transmission of the 'EOTF_identification' parameter in the content information descriptor are used in combination, the following processing can be considered when there is a mismatch between the two pieces of identification information. The first processing example is an example in which the 'EOTF_identification' flag in the encoded video stream is used preferentially. In this case, there is an advantage that the switching between HDR video content and SDR video content as described above can be precisely synchronized with the switching timing of the corresponding video processing. The second processing example is an example in which the 'EOTF_identification' parameter in the content information descriptor is used preferentially. In this case, there is an advantage that the transfer characteristics and the like can be quickly identified without referring to the encoded video stream.

[0363] The content information descriptor may have a data structure different from that shown in FIG. 29A. For example, the content information descriptor may further include a parameter different from each of the parameters, or may not include all of the parameters. The parameters may have different names. The parameters do not necessarily need to be described in one descriptor, and may be described in, for example, two different descriptors. The parameters may be described in a descriptor and arranged in a table, or may be described directly in a table.

[0364] [EPG display on broadcast receiving device] In the broadcast receiving device 100 of this embodiment, as in embodiment 1, by identifying the service ID by referring to the MH-EIT, etc., it is possible to obtain information such as the start time and broadcast duration of each event (broadcast program) and create an EPG screen, and the created EPG can be superimposed on video information, etc. by the video synthesis unit 161 and displayed on the monitor unit 162.

[0365] Furthermore, in the broadcast receiving device 100 of this embodiment, when the type of the video content of each broadcast program is "1" or "3" by referring to the "content_type" parameter of the content information descriptor, a symbol or the like representing an attribute indicating that the broadcast program is a program compatible with HDR may be displayed as shown in FIG. 30. The symbol or the like representing the attribute may be, for example, a symbol / character indicating that the broadcast program is compatible with HDR, or may be a mark 162a5 that symbolizes "HDR" meaning that the broadcast program is compatible with HDR. The symbol or the like representing the attribute may be displayed in the title area 162a2 of the detailed information 162a1. Alternatively, it may be displayed in a pop-up when the cursor is placed on the detailed information 162a1. It may also be displayed in other ways.

[0366] In addition, if the content information descriptor has a parameter such as "HDR_flag" that indicates whether the video content of the broadcast program is compatible with HDR, the "HDR_flag" parameter may be referenced to control whether or not to display a symbol or the like that represents an attribute that indicates that the broadcast program is a program that is compatible with HDR. Note that the name of the "HDR_flag" parameter is an example, and a different name may be used.

[0367] In addition, all or any of the parameters such as the “source_luminance_max”, “max_light_level_of_content”, and “max_light_level_of_frame” of the content information descriptor are set to a predetermined value (for example, “100 (cd / m 2 ) or the like), control may be performed to display a symbol or the like representing an attribute indicating that the broadcast program is an HDR-compatible program.

[0368] In addition, even if the type of the video content of each broadcast program is "1" or "3" by referring to the "content_type" parameter of the content information descriptor, or if all or any of the "source_luminance_max" parameter, "max_light_level_of_content" parameter, "max_light_level_of_frame" parameter, etc. of the content information descriptor is a predetermined value (for example, "100 (cd / m 2 ) etc.), if the monitor unit 162 of the broadcast receiving device 100 is not HDR-compatible, control may be performed so as not to display the symbols / characters indicating that the broadcast program is HDR-compatible or the mark 162a5 symbolizing "HDR", which means that the broadcast program is HDR-compatible.

[0369] Furthermore, the broadcast receiving device 100 of this embodiment may refer to the "EOTF_identification" parameter of the content information descriptor, and when the type of gamma correction applied to the video content of each broadcast program is compatible with the display characteristics of the monitor unit 162 of the broadcast receiving device 100, a symbol or the like representing an attribute indicating that the broadcast program is a program that can be displayed with correct luminance expression may be displayed. The symbol or the like representing the attribute may be, for example, a symbol / character indicating that the program is a program that can be displayed with correct luminance expression, or may be a mark 162a6 that symbolizes "True Contrast" which means that the program is a program that can be displayed with correct luminance expression. Note that, as described above, when the type of gamma correction applied to the video content of each broadcast program is compatible with the display characteristics of the monitor unit 162 of the broadcast receiving device 100, for example, when the "EOTF_identification" parameter related to the video content is "0" and the display characteristics of the monitor unit 162 of the broadcast receiving device 100 are compliant with BT.709, etc.

[0370] By displaying symbols or the like representing attributes such as those described above in the detailed information 162a1 of the EPG screen 162a, the user can easily understand whether each broadcast program displayed on the EPG screen 162a is compatible with HDR, whether the program can be displayed with the correct brightness expression, and so on.

[0371] [Color gamut conversion processing for broadcast receiving devices] In this embodiment, it is assumed that the video content, which is a recorded program, has been subjected to video / audio editing processing by the editing device 390e as shown in FIG. 28. That is, the provider of the video content edits and processes the video content while checking it on the monitor device of the editing device 390e, and therefore, it is highly likely that the video content is displayed appropriately under the color reproduction performance of the monitor device of the editing device 390e. Meanwhile, the monitor unit 162 of the broadcast receiving device 100, which is the monitor device used by the user to view the video content, also generally has different color reproduction performance depending on the manufacturer and model. In this case, if the color reproduction performance of the monitor device of the editing device 390e is significantly different from the color reproduction performance of the monitor unit 162 of the broadcast receiving device 100, there is a possibility that a problem will occur in which the video content provider's intended video expression cannot be correctly performed when the video content is displayed on the monitor unit 162 of the broadcast receiving device 100.

[0372] That is, in the broadcasting system of this embodiment, as described above, a content information descriptor is transmitted as a MMT-SI descriptor. This content information descriptor indicates, as parameters indicating information about the color reproduction performance of a source device, the coordinate values ​​on the CIE chromaticity diagram of each of the R / G / B primary colors and the white reference point of the color gamut that the source device can handle.

[0373] In addition, the broadcast receiving device 100 of this embodiment stores, in various information storage areas of the storage unit 110, coordinate values ​​on the CIE chromaticity diagram of each of the R / G / B primary colors and the white reference point of the color gamut that the monitor unit 162 can handle, as parameters indicating information regarding the color reproduction performance of the monitor unit 162. In the above situation, if the coordinates of the R / G / B primary colors and the white reference point of the color gamut compatible with the source device described in the content information descriptor are R0 / G0 / B0 and W0, respectively, as shown in FIG. 31A, and the coordinates of the R / G / B primary colors and the white reference point of the color gamut compatible with the monitor unit 162 stored in the various information storage areas of the storage unit 110 are R1 / G1 / B1 and W1, respectively, then the portion of the area consisting of R0 / G0 / B0, which is the color gamut compatible with the source device, that does not overlap with the area consisting of R1 / G1 / B1, which is the color gamut compatible with the monitor unit 162, is an area that may not be displayed correctly on the monitor unit 162.

[0374] In order to solve the above-mentioned problem, the broadcast receiving device 100 of this embodiment is provided with a color gamut conversion processing function that converts the video data of the video content into video data suitable for display on the monitor unit 162 when there is a discrepancy between the color gamut that the source device can handle described in the content information descriptor and the color gamut that the monitor unit 162 can handle stored in the various information storage areas of the storage unit 110. The color gamut conversion function provided in the broadcast receiving device 100 will be described below.

[0375] The color gamut conversion processing function of the broadcast receiving device 100 of this embodiment is a function to convert the color gamut of the video data (equivalent to the area consisting of R0 / G0 / B0, which is the color gamut that the source device shown in Figure 31A can support) so that it is compatible with the color gamut based on the color reproduction performance of the monitor unit 162 (the area consisting of R1 / G1 / B1 shown in Figure 31A).

[0376] The color gamut conversion processing function provided in the broadcast receiving device 100 of this embodiment may convert the color gamut of the video data so that correct color reproduction is possible on the monitor unit 162 by referring to the coordinate values ​​of each of the R / G / B primary colors of the color gamut that the source device can support, which is described in the content information descriptor, and the coordinate values ​​of each of the R / G / B primary colors of the color gamut that the monitor unit 162 can support, which are stored in various information storage areas of the storage unit 110.

[0377] Note that, on the line segment R0 / G0 (or a region nearby), the color gamut conversion process may be performed by referring only to the coordinate values ​​of the R / G primary colors of the color gamut that the source device can support and the coordinate values ​​of the R / G primary colors of the color gamut that the monitor unit 162 can support. On the line segment G0 / B0 (or a region nearby), the color gamut conversion process may be performed by referring only to the coordinate values ​​of the G / B primary colors of the color gamut that the source device can support and the coordinate values ​​of the G / B primary colors of the color gamut that the monitor unit 162 can support. On the line segment R0 / B0 (or a region nearby), the color gamut conversion process may be performed by referring only to the coordinate values ​​of the R / B primary colors of the color gamut that the source device can support and the coordinate values ​​of the R / B primary colors of the color gamut that the monitor unit 162 can support.

[0378] Alternatively, as shown in Fig. 31B, the color gamut of the video data may be divided into three regions, and the color gamut conversion process may be different for each divided region. For example, in the region of the color gamut of the video data consisting of R0 / G0 / W0, the color gamut conversion process is performed by referring to the coordinate values ​​of each R / G primary color and white reference point of the color gamut that the source device can support and the coordinate values ​​of each R / G primary color and white reference point of the color gamut that the monitor unit 162 can support. In the region of the color gamut of the video data consisting of G0 / B0 / W0, the color gamut conversion process is performed by referring to the coordinate values ​​of each G / B primary color and white reference point of the color gamut that the source device can support and the coordinate values ​​of each G / B primary color and white reference point of the color gamut that the monitor unit 162 can support. In the area of ​​the color gamut of the video data that is composed of R0 / B0 / W0, color gamut conversion processing is performed by referring to the coordinate values ​​of each R / B primary color and white reference point of the color gamut that the source device can support and the coordinate values ​​of each R / B primary color and white reference point of the color gamut that the monitor unit 162 can support.

[0379] Furthermore, when the color gamut conversion process is made different for each divided area, the color gamut conversion process may be performed on the line segment R0 / W0 (or its neighboring area) by referring only to the coordinate values ​​of the R primary color and the white reference point of the color gamut that the source device can support and the coordinate values ​​of the R primary color and the white reference point of the color gamut that the monitor unit 162 can support. The color gamut conversion process may be performed on the line segment G0 / W0 (or its neighboring area) by referring only to the coordinate values ​​of the G primary color and the white reference point of the color gamut that the source device can support and the coordinate values ​​of the G primary color and the white reference point of the color gamut that the monitor unit 162 can support. The color gamut conversion process may be performed on the line segment B0 / W0 (or its neighboring area) by referring only to the coordinate values ​​of the B primary color and the white reference point of the color gamut that the source device can support and the coordinate values ​​of the B primary color and the white reference point of the color gamut that the monitor unit 162 can support.

[0380] An example of the color gamut conversion process will be described with reference to FIG. 31C. In the figure, R0, G0, and B0 are the coordinates of each of the primary colors R / G / B of the color gamut that the source device can handle described in the content information descriptor, and have the coordinate values ​​of (R0x, R0y), (G0x, G0y), and (B0x, B0y), respectively. Also, R1, G1, and B1 are the coordinates of each of the primary colors R / G / B of the color gamut that the monitor unit 162 can handle stored in the various information storage area of ​​the storage unit 110, and have the coordinate values ​​of (R1x, R1y), (G1x, G1y), and (B1x, B1y), respectively. Also, P0 is a predetermined color gamut data of the video content, and has the coordinate values ​​of (P0x, P0y). In this case, the color gamut data of P0 is converted to color gamut data indicated by P1 by the color gamut conversion process. It should be noted that P1 has coordinate values ​​of (P1x, P1y) and is calculated by the arithmetic expression for the color gamut conversion process, an example of which is shown below.

[0381] <Example of color gamut conversion formula> P1 = αR1 + βG1 + γB1 however, α={(G0y-B0y)(P0x-B0x)+(B0x-G0x)(P0y-B0y)} / {(G0y-B0y)(R0x-B0x) +(B0x-G0x)(R0y-B0y)} β={(B0y-R0y)(P0x-B0x)+(R0x-B0x)(P0y-B0y)} / {(G0y-B0y)(R0x-B0x) +(B0x-G0x)(R0y-B0y)} γ=1-α-β

[0382] The above-mentioned formula is an example of a case where the color gamut conversion process of all color gamut data in the color gamut area of ​​the video content is performed by referring to the coordinate values ​​of each of the R / G / B primary colors of the color gamut that the source device can handle, which is described in the content information descriptor, and the coordinate values ​​of each of the R / G / B primary colors of the color gamut that the monitor unit 162 can handle, which is stored in the various information storage area of ​​the storage unit 110. A similar calculation is possible even when the color gamut of the video data is divided into three areas and the color gamut conversion process is different for each divided area. (However, the parameters to be referred to are different.) Also, since the above-mentioned formula is a known formula using a barycentric coordinate system, detailed explanations regarding the derivation of the formula will be omitted. Also, the above-mentioned formula is merely an example, and the coordinate values ​​of P1 may be calculated using a different formula.

[0383] Furthermore, if the entire color gamut area of ​​the video content is included within the color gamut area that the monitor device (such as the broadcast receiving device 100) can handle, the color gamut conversion process does not need to be performed. For example, if the color gamut of the video content is equivalent to the BT.709 color gamut shown in FIG. 29C and the color gamut that the monitor device (such as the broadcast receiving device 100) can handle is equivalent to the BT.2020 color gamut, the entire color gamut area of ​​the BT.709 color gamut is included within the BT.2020 color gamut area, so there is no need to perform the color gamut conversion process. That is, the monitor device (such as the broadcast receiving device 100) can display all the color gamut data of the video content.

[0384] As described above, according to the color gamut conversion processing function of the broadcast receiving device 100 of this embodiment, even if the color reproduction performance of the source device and the color reproduction performance of the monitor unit 162 of the broadcast receiving device 100 differ, it is possible to display the video content favorably when displaying the video content on the monitor unit 162 of the broadcast receiving device 100.

[0385] [Brightness adjustment process for broadcast receiving devices] The broadcast receiving device 100 of this embodiment is assumed to have image quality adjustment items as shown in Fig. 32. Each of the image quality adjustment items can be adjusted according to the user's preference by a user's operation. Meanwhile, for an item related to brightness adjustment among the image quality adjustment items, automatic brightness adjustment may be possible by referring to the description in the content information descriptor. The automatic brightness adjustment process will be described below.

[0386] In the broadcast receiving device 100 of this embodiment, it is possible to perform automatic brightness adjustment by referring to the content information descriptor's (1) ``source_luminance_max'' and ``source_luminance_min'' parameters, (2) ``max_light_level_of_content'' and ``source_luminance_min'' parameters, and (3) ``max_light_level_of_content'' parameter only.

[0387] In this embodiment, the broadcast receiving device 100 stores the maximum and minimum brightness values ​​that can be displayed on the monitor unit 162 in various information storage areas of the storage unit 110 as parameters indicating information related to the brightness display performance of the monitor unit 162.

[0388] The automatic brightness adjustment of the method (1) is performed by referring to the “source_luminance_max” and “source_luminance_min” parameters described in the content information descriptor, and the maximum / minimum brightness values ​​that can be displayed on the monitor unit 162 stored in the various information storage areas of the storage unit 110.

[0389] 33A, a conversion process is performed on the luminance expression range of the video content so that the luminance level indicated by the "source_luminance_max" parameter roughly matches the maximum luminance level that can be displayed on the monitor unit 162, and so that the luminance level indicated by the "source_luminance_min" parameter roughly matches the minimum luminance level that can be displayed on the monitor unit 162. By performing the conversion process on the luminance expression range, the user can view, on the monitor unit 162 of the broadcast receiving device 100, video content that has been given the same luminance expression as the monitor device of the editing device 390e that the content provider used to edit and process the content.

[0390] The automatic brightness adjustment in the method (2) is performed by referring to the “max_light_level_of_content” parameter and the “source_luminance_min” parameter described in the content information descriptor, and the maximum / minimum brightness values ​​that can be displayed on the monitor unit 162 stored in the various information storage areas of the storage unit 110.

[0391] 33B, a conversion process is performed on the luminance expression range of the video content so that the luminance level indicated by the "max_light_level_of_content" parameter roughly matches the maximum luminance level that can be displayed on the monitor unit 162, and so that the luminance level indicated by the "source_luminance_min" parameter roughly matches the minimum luminance level that can be displayed on the monitor unit 162. By performing the conversion process on the luminance expression range, the user can watch the video content by making full use of the contrast performance of the monitor unit 162 of the broadcast receiving device 100.

[0392] In addition, if the content information descriptor further has a parameter indicating the minimum luminance within each scene (chapter) (for example, "min_light_level_of_content (minimum content luminance)"), by referring to the "min_light_level_of_content" parameter instead of the "source_luminance_min" parameter, it is possible to more effectively utilize the contrast performance of the monitor unit 162 of the broadcast receiving device 100.

[0393] Furthermore, the conversion process of the luminance expression range in the above method (2) may be performed by changing the parameters to be referenced for each scene (chapter) when the "num_of_scene" parameter is not "1." In this case, it is possible to ensure suitable contrast performance on the monitor unit 162 of the broadcast receiving device 100 for each scene (chapter).

[0394] The automatic brightness adjustment in the method (3) is performed by referring to the "max_light_level_of_content" parameter described in the content information descriptor and the maximum brightness value that can be displayed on the monitor unit 162 stored in the various information storage area of ​​the storage unit 110. The minimum brightness value is set to "0 (cd / m 2 In this case, it is possible to obtain the same effect as the automatic brightness adjustment of the above method (2), and furthermore, it is possible to perform conversion processing of the brightness expression range with simple calculations by referring to a small number of parameters. In addition, the conversion process of the luminance expression range may be performed only when the ``source_luminance_max'' parameter and the ``max_light_level_of_content'' parameter described in the content information descriptor are greater than the maximum luminance value that can be displayed on the monitor unit 162 stored in the various information storage areas of the storage unit 110.

[0395] In other words, if the "source_luminance_max" parameter or the "max_light_level_of_content" parameter described in the content information descriptor is greater than the maximum brightness value that can be displayed on the monitor unit 162 stored in the various information storage areas of the storage unit 110, then there is a possibility that brightness loss will occur if the received video content is displayed as is on the monitor unit of the broadcast receiving device 100, but in the opposite case, there is no possibility that the brightness loss will occur.

[0396] As described above, according to the automatic brightness adjustment process of the broadcast receiving device 100 of this embodiment, by referring to the content information descriptor, the user can watch video content with an appropriate brightness expression on the monitor unit 162 of the broadcast receiving device 100.

[0397] According to this embodiment, by referring to content information accompanying the program content contained in the broadcast wave, it is possible to provide a more useful MMT-compatible broadcast receiving device capable of performing the above-mentioned processes corresponding to HDR and an expanded color gamut. Example 4

[0398] The following describes the fourth embodiment of the present invention. The configuration and effects of the fourth embodiment are the same as those of the third embodiment unless otherwise specified. Therefore, the following mainly describes the differences between the fourth embodiment and the third embodiment, and omits as much as possible the description of the common points to avoid duplication.

[0399] [System Configuration] FIG. 34 is a system configuration diagram showing an example of a broadcast communication system including the 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 radio tower 300t of a broadcast station, a broadcast satellite (or a communication satellite) 300s, a broadcast station server 300, a service provider server 400, and other application servers 500. Although not shown in the figure, 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, in the same connection as in 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 directly communicate with the broadcast receiving device 40100 without going through the router device 200r or the like.

[0400] Also, as shown in FIG. 28, the encoded data of the program content contained in the broadcast waves transmitted from the radio tower 300t may be output from a filming device 390c, or may be data that has been subjected to various video / audio editing processes by an editing device 390e.

[0401] 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 passing through the broadcast satellite (or communication satellite) 300s. The broadcast receiving device 40100 can be connected to the Internet 200 via a router device 200r, and can transmit and receive data by communicating with each server device on the Internet 200 and other communication devices.

[0402] The connection cable 40200 is a communication cable that connects the broadcast receiving device 40100 and the monitor device 40300, and transmits the encoded video / audio data, etc., output from the broadcast receiving device 40100. The monitor device 40300 is a video display device that provides the user with video information and audio information obtained by performing predetermined signal processing on the encoded video / audio data, etc., received via the connection cable 40200, via a display device such as a liquid crystal panel and a speaker.

[0403] The monitoring device 40300 may be connectable to the Internet 200 via the router device 200r and may be capable of transmitting and receiving data by communication with each server device and other communication devices on the Internet 200. The monitoring device 40300 may be capable of receiving broadcast waves transmitted from a radio tower 300t via an antenna 40300a (not shown).

[0404] [Hardware configuration of broadcast receiving device] 35A 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 text superimposition 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.

[0405] 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 unit 165 may be omitted.

[0406] 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 outputting, as is, an MMT data string obtained by demodulation in the tuner / demodulator unit 131, an MMT data string acquired via the LAN communication unit 121, or mixed data of the above-mentioned MMT data strings. In addition, the digital interface unit 40125 may control the MMT data string input to the separator 132.

[0407] The output of the digital content stored in the storage (accumulation) unit 110 or the storage of the digital content in the storage (accumulation) unit 110 may be performed via a digital interface unit 40125. The digital interface unit 40125 may be a DVI terminal, an HDMI (registered trademark) terminal, a Display Port (registered trademark) terminal, or the like, and may be controlled to output the video data and audio data 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 Display Port specification, or the like.

[0408] The transcode processing unit 40181 is a signal processing unit that performs transcode calculation processing to convert the coding format, bit rate, media transport method, etc. of each component that constitutes the content. For example, the transcode processing unit 40181 is capable of converting an MMT data string of a broadcast program content including a video component in MPEG-H HEVC format output from the separation unit 132 into an MPEG2-TS data string (or an MPEG2-PS data string) of a program content including a video component in MPEG-2 or MPEG-4 AVC (Advanced Video Coding) format.

[0409] It is also possible to perform processing to change only the bit rate without changing the component coding format or media transport method. The program content that has been subjected to the transcode arithmetic processing can be stored in the storage unit 110 as a recorded content, or can be output from the digital interface unit 40125 or the like and supplied to an external monitor device or the like.

[0410] [Software configuration of broadcast receiving device] 35B is a software configuration diagram of the broadcast receiving device 40100 of this embodiment, and shows the software configuration in the ROM 103, the RAM 104, and the storage (accumulation) unit 110. Compared to the software configuration diagram of the broadcast receiving device 100 of embodiment 1 (see FIG. 7D), a transcoding processing program 41003 and a recording / playback processing program 41004 are added to the storage (accumulation) unit 110.

[0411] The transcoding processing program 41003 and the recording / playback processing program 41004 stored in the storage (accumulation) unit 110 are respectively expanded in the RAM 104, and the main control unit 101 executes the expanded transcoding processing program and the recording / playback processing program to constitute a transcoding processing execution unit 41103 and a recording / playback processing execution unit 41104. The transcoding processing execution unit 41103 mainly controls the transcoding calculation processing in the transcoding processing unit 40181. The recording / playback processing execution unit 41104 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.

[0412] 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.

[0413] It should be noted that the software configuration shown in FIG. 35B is merely an example, and this embodiment does not necessarily have to include all of the programs and execution units shown in the figure.

[0414] [Interface configuration between broadcast receiving device and monitor device] Fig. 36 is a system configuration diagram showing an example of an 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 cable 40200 is connected to the connection terminal.

[0415] 36, the connection cable 40200 is configured with n pairs of differential transmission lanes CH1 to CHn, a DDC (Display Data Channel) line standardized by VESA (Video Electronics Standard Association), an HPD (Hot Plug Detect) line, a CEC (Consumer Electronics Control) line, etc. The differential transmission lanes may be called differential transmission lines.

[0416] 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 lanes and one pair of data lanes may be used. All of the n pairs of differential transmission lanes may be data lanes that transmit data on which a clock is superimposed. For example, n=4 and four pairs of data lanes may be used. The clock lanes and data lanes may be referred to as clock lines and data lines, respectively.

[0417] 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 audio synthesis unit 164 via the transmission processing unit 40125b of the digital interface unit 40125 on the broadcast receiving device 40100 side to the data lane. The predetermined format may conform to the specifications of HDMI (registered trademark) or the like, and detailed explanations 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 appropriately subjected to necessary processing such as image quality adjustment and volume adjustment in the video processing unit and audio processing unit (not shown), and are output from the display unit and speaker of the monitor device 40300.

[0418] The connection cable 40200 may further include a power supply line, a GND line, and a backup line, although not shown. The n pairs of differential transmission lanes and communication lines may be shielded by a GND line. All or part of the backup line, DDC line, HPD line, and CEC line may be used as part of a communication line for network communication. For example, the backup line and the 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 and the like 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.

[0419] 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 further, is capable of reading EDID (Extended Display Identification Data) from the EDID storage unit 40325c. In other words, the broadcast receiving device 40100 can grasp the display performance of the monitor device 40300 by acquiring the EDID.

[0420] In this embodiment, the display performance refers to items such as the input resolution and frame rate that the monitor device 40300 can handle, the video standard, whether or not it supports 3D image display, and whether or not the monitor device 40300 can perform processing that supports HDR or an expanded color gamut.

[0421] In this embodiment, the following description will be given taking as an example a process of 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, performance identification information that is different from EDID and identifies the display performance and functions of the monitor device 40300 may be acquired. Furthermore, the display performance of the monitor device 40300 may be grasped by a means other than acquiring the performance identification information.

[0422] Also, 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 and that the power supply of the monitor device 40300 has been turned on. Also, the transmission control unit 40125a of the digital interface unit 40125 on the broadcast receiving device 40100 side is capable of performing processing such as turning on the power supply of the monitor device 40300 via the CEC line, etc. Also, the reception control unit 40325a of the digital interface unit on the monitor device 40300 side also controls the reception processing unit 40325b.

[0423] It should be noted that 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. 36 are merely examples, and different configurations may also be used.

[0424] [Mastering information parameters] In this embodiment, as in the third embodiment, the content information descriptor shown in Fig. 29A is transmitted as control information related to the program content together with each message / table / descriptor of the MMT-SI described above. On the other hand, the broadcast receiving device 40100 in this embodiment does not include a monitor unit or a speaker that ultimately provides a video signal and an audio signal to the user, but transmits encoded video / audio data, etc. to the monitor device 40300 via the connection cable 40200, and causes the monitor device 40300 to provide the video signal and the audio signal to the user. That is, the processes such as the color gamut conversion process and the brightness adjustment process described in the third embodiment are performed on the monitor device 40300 side according to the display performance of the display unit of the monitor device 40300.

[0425] In order to enable each of the above processes on the monitor device 40300 side, the broadcast receiving device 40100 of this embodiment has a function of receiving the content information descriptor from a broadcast wave, appropriately selecting each parameter described in the received content information descriptor, and transmitting the selected parameter as mastering information in a predetermined format to the monitor device 40300 via the connection cable 40200. Note that, for example, if the connection cable 40200 is an HDMI (registered trademark) cable and the video data, audio data, and other control signals output from the digital interface unit 40125 are in a format compliant with the HDMI (registered trademark) specifications, the mastering information may be output as part of the other control signals.

[0426] FIG. 37 shows a list of each parameter that the broadcast receiving device 40100 of this embodiment transmits to the monitoring device 40300 as mastering information.

[0427] "source_primaries_R[x,y]", "source_primaries_G[x,y]", and "source_primaries_B[x,y]" are parameters indicating information on the color reproduction performance of a source device, and indicate the color gamut that the source device can handle by the coordinate values ​​of each of the primary colors R (red) / G (green) / B (blue) on the CIE chromaticity diagram. Each of the parameters "source_primaries_rx", "source_primaries_ry", "source_primaries_gx", "source_primaries_gy", "source_primaries_bx", and "source_primaries_by" described in the content information descriptor may be selected and output as the parameters "source_primaries_R[x,y]", "source_primaries_G[x,y]", and "source_primaries_B[x,y]" of the mastering information.

[0428] "white_point_x,y" is a parameter indicating information on the color reproduction performance of a source device, and indicates the coordinate value on the CIE chromaticity diagram of the white reference point that the source device can support. The "source_white_point_x" and "source_white_point_y" parameters described in the content information descriptor may be selected and output as the "white_point_x,y" parameters of the mastering information.

[0429] "max_source_mastering_luminance" is a parameter that indicates information about the maximum luminance that the source device can handle. 2 : candela / square meter) ~ 65535 (cd / m 2 The “source_luminance_max” parameter described in the content information descriptor may be selected and output as the “max_source_mastering_luminance” parameter of the mastering information.

[0430] "min_source_mastering_luminance" is a parameter that indicates information about the minimum luminance that the source device can handle. 2 ) to 6.5535 (cd / m 2 The “source_luminance_min” parameter described in the content information descriptor may be selected and output as the “min_source_mastering_luminance” parameter of the mastering information.

[0431] "Maximum_Content_Light_Level" is a parameter that indicates the maximum luminance in the content. 2 ) ~ 65535 (cd / m 2 The “max_light_level_of_content” parameter described in the content information descriptor may be selected and output as the “Maximum_Content_Light_Level” parameter of the mastering information.

[0432] "Maximum_Frame-average_Light_Level" is a parameter that indicates the maximum value of the average frame luminance in the content. 2 ) ~ 65535 (cd / m 2 The “max_frame_ave_light_level” parameter described in the content information descriptor may be selected and output as the “Maximum_Frame-average_Light_Level” parameter of the mastering information.

[0433] "Light Level Status" is a 2-bit flag signal that indicates the status of the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter.

[0434] When the value of this flag is "00b", the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter indicate the maximum value of the maximum brightness and the frame average brightness throughout the entire content. When the value of this flag is "01b", the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter indicate the maximum brightness and the maximum value of the frame average brightness for each scene (chapter).

[0435] When the value of this flag is "10b", it indicates that the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter are omitted. Instead of setting the value of this flag to "10b", the values ​​of the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter may be set to "0".

[0436] The broadcast receiving device 40100 of this embodiment transmits the above-described parameters as mastering information to the monitor device 40300 via the connection cable 40200, whereby the monitor device 40300 can perform processing such as color gamut conversion processing and brightness adjustment processing in accordance with the display performance of the display unit of the monitor device 40300 on the coded video / audio data transmitted from the broadcast receiving device 40100. Note that each parameter of the mastering information described above may further include another parameter different from the parameters shown in Fig. 37, or it is not necessary to include all of the above parameters. Also, each parameter may have a different name.

[0437] [Mastering information generation process for broadcast receiving device] In this embodiment, when the "content_type" parameter of the content information descriptor is "2" or "3", the video content is content data (such as a live broadcast program) output from the image capture device 390c, and the content information descriptor does not have the "max_light_level_of_content" parameter and the "max_frame_ave_light_level" parameter. That is, in a live broadcast program, the maximum brightness and the maximum average brightness throughout the entire content are not determined until the end of the program content.

[0438] In this case, the broadcast receiving device 40100 of this embodiment outputs mastering information with the values ​​of the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter each set to "0." Alternatively, the "max_light_level_of_frame" parameter and the "frame_average_light_level" parameter of the content information descriptor may be substituted for the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter.

[0439] On the other hand, when the video content is recorded in the content memory area 1200 of the storage (accumulation) unit 110, the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter may be created by the broadcast receiving device 40100. That is, by performing a recording process of the video content, the broadcast receiving device 40100 can scan the video content from the beginning to the end, and therefore can determine the maximum values ​​of the maximum brightness and the average brightness throughout the entire content.

[0440] Furthermore, when video content recorded in the content memory area 1200 of the storage unit 110 by a recording process is output to the monitor device 40300 by a playback process from the digital interface unit 40125 via the connection cable 40200, the broadcast receiving device 40100 may perform control so as to output the maximum values ​​of the maximum luminance and average luminance throughout the entire content, which are created by scanning the video content from its beginning to its end, as the "Maximum_Content_Light_Level" parameter and the "Maximum_Frame-average_Light_Level" parameter. In other words, in the case of video content that has been recorded once, it is possible to output all parameters of the mastering information to the monitor device 40300, regardless of the value of the "content_type" parameter of the content information descriptor.

[0441] [Mastering information output control for broadcast receiving devices] Each parameter of the mastering information may be always output to the monitor device 40300 connected via the connection cable 40200. Alternatively, each parameter of the mastering information may be output to the monitor device 40300 via the connection cable 40200 only when the transmission processing unit 40125b of the digital interface unit 40125 on the broadcast receiving device 40100 side refers to the EDID acquired from the EDID storage unit 40325c of the monitor device 40300 and understands that the monitor device 40300 is capable of processing compatible with HDR or an expanded color gamut. Alternatively, each parameter of the mastering information may be output to the monitor device 40300 via the connection cable 40200 only when the content information descriptor indicates that the video content of the broadcast program is a program compatible with HDR.

[0442] The above-mentioned content information descriptor indicates that the video content of the broadcast program is compatible with HDR when the “content_type” parameter of the content information descriptor is “1” or “3”, when the “HDR_flag” parameter of the content information descriptor indicates that the video content of the broadcast program is compatible with HDR, and when all or any of the “source_luminance_max” parameter, the “max_light_level_of_content” parameter, the “max_light_level_of_frame” parameter, etc. of the content information descriptor are equal to or greater than a predetermined value (for example, “100(cd / m 2 )" etc.)

[0443] Furthermore, the output of each parameter of the mastering information may be controlled according to the interface type of the digital interface unit 40125. For example, when the interface type of the digital interface unit 40125 is an HDMI interface, control is performed so that each parameter of the mastering information is output, and when the interface type is a DVI interface, control is performed so that each parameter of the mastering information is not output, etc.

[0444] Alternatively, the output of each parameter of the mastering information may be controlled according to the interface type of the digital interface unit 40125 on the broadcast receiving device 40100 side and the interface type of the digital interface unit on the monitor device 40300 side. For example, when the interface type of the digital interface unit 40125 on the broadcast receiving device 40100 side and the interface type of the digital interface unit on the monitor device 40300 side are both HDMI interfaces, control is performed so as to output each parameter of the mastering information, and when the interface type of the digital interface unit 40125 on the broadcast receiving device 40100 side is an HDMI interface but the interface type of the digital interface unit on the monitor device 40300 side is not an HDMI interface (for example, when it is a DVI interface or a Display Port interface, i.e., when the connection cable 40200 is an interface conversion cable), control is performed so as not to output each parameter of the mastering information, and so on.

[0445] Furthermore, when the digital interface unit 40125 is composed of a first digital interface terminal and a second digital interface terminal, the format of the output data may be controlled to be different depending on whether the data is output from the first digital interface terminal or the second digital interface terminal. In this case, each of the digital interface terminals has the configuration shown in FIG. 36 or another configuration.

[0446] For example, if the first digital interface terminal is an HDMI interface and the second digital interface is not an HDMI interface, the output data generation process and the data output process can be controlled so that, when outputting data from the first digital interface terminal, output data including a video signal, an audio signal, and the mastering information is generated and the data is output from the first digital interface terminal, and, when outputting data from the second digital interface terminal, output data including a video signal and an audio signal but not including the mastering information is generated and the data is output from the second digital interface terminal.

[0447] As described above, according to the broadcast receiving device 40100 of this embodiment, by transmitting mastering information together with encoded video / audio data to the monitor device 40300, it becomes possible to suitably execute color gamut conversion processing, brightness adjustment processing, and the like on the monitor device 40300 side. In other words, it becomes possible to provide a broadcast receiving device capable of executing functions with higher added value.

[0448] Example 5 The following describes the fifth embodiment of the present invention. The configuration and effects of the fifth embodiment are the same as those of the fourth embodiment unless otherwise specified. Therefore, the following mainly describes the differences between the fifth embodiment and the fourth embodiment, and omits as much as possible the description of the common points to avoid duplication.

[0449] [System Configuration] FIG. 38 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 FIG. 38 has the same configuration as the broadcast communication system of FIG. 34, but the output destination to which the broadcast receiving device 40100 outputs the content is an external video processing device 50300 instead of a monitor device 40300. This means that the output destination of the content includes a video playback device such as a recorder in addition to a display device. Furthermore, in the broadcast communication system including the broadcast receiving device of this embodiment, the control information transmitted together with the content received by the broadcast receiving device 40100 via the broadcast station's radio tower 300t, the broadcast satellite (or communication satellite) 300s, and the broadcast station server 300 is called "reception control information". This includes various control information described in the first embodiment and control information additionally described in this embodiment. Furthermore, in the broadcast communication system including the broadcast receiving device of this embodiment, when the broadcast receiving device 40100 outputs the content to the external video processing device 50300 via a network via the router device 200r, the control information transmitted together with the content is called "output control information".

[0450] The hardware configuration of the broadcast receiving device, the software configuration of the broadcast receiving device, and the interface configuration between the broadcast receiving device and the monitor device are the same as those in the fourth embodiment, so that repeated explanation will be omitted.

[0451] 35A, by configuring the digital interface unit 40125 using the hardware of the LAN communication unit 121, it is possible to perform output from the digital interface unit 40125 to an output destination on the network. Here, the output from the digital interface unit 40125 is not limited to an MMT data string, and may be an MPEG2-TS data string (or an MPEG2-PS data string) transcoded from the MMT data string by the transcode processing unit 40181. This is an example of configuration as the "IP interface" explained in the first embodiment.

[0452] Here, in the broadcast communication system of Figure 38, when the broadcast receiving device 40100 outputs content to the external video processing device 50300 via a network via the router device 200r, this means that the broadcast receiving device 40100 outputs content to the external video processing device 50300 via the IP interface.

[0453] As described in the third and fourth embodiments of the present invention, the broadcasting and communication system of the present embodiment is capable of transmitting high-definition content, such as not only SDR video content with a resolution of 1920×1080 pixels or less, but also content with a resolution exceeding 1920×1080 pixels and HDR video content. Here, when the high-definition video content broadcast in the broadcasting and communication system is re-output by the receiver to an external device via an interface, content protection that is higher than that of SDR video content with a resolution of 1920×1080 pixels or less is required.

[0454] To achieve this, content protection using DTCP2 (described in Reference 1), a more advanced content protection system than DTCP-IP, has been developed as an interface transmission technology.

[0455] [Reference 1: Digital Transmission Licensing Administrator DTCP2 Presentation to CPTWG January 27, 2016]

[0456] Specifically, four flags ("L2-Only" Flag, "EI" Flag, "HDR" Flag, "SDO" Flag) shown in FIG. 39 are newly prepared. For example, the "L2-Only" Flag in FIG. 39 indicates that "either content protection, DTCP-IP (L1 level content protection) or DTCP2 (L2 level content protection), can be applied" when it is "0", and indicates that "a higher level of content protection (e.g., L2 level content protection such as DTCP2) than DTCP-IP (L1 level content protection) is required" when it is "1". Note that DTCP-IP (L1 level content protection) is referred to as "DTCP1" in the following description to distinguish it from "DTCP2". Also, the "EI" Flag indicates that "the content is 'Non-Enhanced Image'" when it is "0", and indicates that "the content is 'Enhanced Image'" when it is "1". Here, "Enhanced Image" refers to content that has video with a pixel count exceeding 1920x1080 or a color space (e.g., HDR such as BT.2020 or SMPTE2084) that exceeds HD-level color space (SDR such as BT.709). Also, "Non-Enhanced Image" refers to content that has video with image quality below HD video quality (e.g., video with a pixel count of 1920x1080 or less and an HD-level color space (SDR such as BT.709)). Also, the "HDR" Flag, when "0", indicates that "the content contains video that may be converted from HDR to SDR," and when "1", indicates that "the content contains video that is prohibited from being converted from HDR to SDR."In addition, if the “SDO” Flag is “0”, it indicates that “in the case of an “Enhanced Image”, it cannot be re-output unless it is protected by L2 level content protection, but if an “Enhanced Image” is converted to a “Non-Enhanced Image”, it can be re-output with L1 level content protection”, and if it is “1”, it indicates that “regardless of whether the content is an “Enhanced Image” or a “Non-Enhanced Image”, it can be re-output with either L2 level content protection or L1 level content protection”.

[0457] When the content protection by DTCP2 described above is applied to the IP interface output of this embodiment, the problem is which content should be assigned which flag as the output control information 50200 of FIG. 38. For example, it is possible to prepare flags substantially corresponding to the four flags in FIG. 39 on the reception control information 50100 side of FIG. 38. In this way, it is possible to make the server of the broadcasting station a sink device of DTCP2. However, the above four flags are 1 bit each, and if these flags can be freely set according to the intention of the broadcasting station side or the production side, there are 2^4 ways, that is, 16 ways of content protection state, if all combinations of the four flags are considered, and it becomes very complicated. It must be said that this is not suitable for "broadcasting" technology, which is received by many viewers at the same time and further, the start and end of the program are repeated in the service selected. The number of viewers targeted by "broadcasting" technology is huge, and the monitors owned by the viewers are also various. For example, if some viewers have monitors that are not HDR compatible, then a situation where these viewers are prevented from viewing the content at all due to content protection control using flags is something that "broadcasting" technology would like to avoid as much as possible. Also, in order to popularize receiving devices, the content transmitted by "broadcasting" technology needs to have a simple type system that is easy for many viewers to understand.

[0458] Furthermore, if a new flag is provided in the reception control information 50100, the equipment on the content production side will become more complicated.

[0459] In consideration of the above, in the broadcast communication system of this embodiment, flags that substantially correspond to the above four flags of DTCP2 are not introduced as they are into the reception control information 50100 of Fig. 38. In addition, when outputting from the broadcast receiving device 40100 to the IP interface, the flags of DTCP2 are operated as the output control information 50200 to perform more suitable content protection. Specifically, in the broadcast communication system of this embodiment, as the reception control information 50100, information on the video resolution of the content, control information on the digital copy of the content, control information on the storage and output of the content, and the EOTF identification information (transmission characteristic identification information) described in the third and fourth embodiments are used, and when outputting from the IP interface, the broadcast receiving device 40100 determines the output protection of each content, including the addition of the flags of DTCP2, according to these pieces of information.

[0460] Here, the information on the video resolution of the content used as one of the pieces of reception control information 50100 will be described. A plurality of types of information on the video resolution of the content are transmitted in the broadcast communication system of this embodiment. The broadcast receiving device 40100 may use any one of these types of information to determine the video resolution (number of pixels) of the content. For example, the determination may be made by acquiring coding parameters stored in the coding stream of HEVC, which is the video coding method of the content of the broadcast system of this embodiment. Alternatively, the determination may be made by acquiring coding parameters described in the MH-HEVC video descriptor placed in the MPT. Alternatively, the determination may be made by acquiring video resolution information described in the video component descriptor.

[0461] Next, control information related to digital copying of content and control information related to storage and output of content used as one piece of reception control information 50100 will be described. Fig. 40 shows a descriptor related to control information related to digital copying of content and control information related to storage and output of content transmitted in the broadcast communication system of this embodiment. Here, the content copy control descriptor stores control information related to digital copying of content or information indicating a maximum transmission rate. Also, the content usage control descriptor stores information describing control information related to storage and output of content. The content copy control descriptor and the content usage control descriptor are, for example, arranged in the MPT and transmitted.

[0462] FIG. 41A shows an example of the data structure of the content copy control descriptor in the broadcasting system of this embodiment. The "digital_recording_control_data" parameter in the figure is digital copy control information, and indicates information for controlling the copy generation of the content. FIG. 41B shows an example of the parameter value of the digital copy control information and its meaning. For example, when the parameter is "00", it indicates "copying possible without restrictions (synonymous with "unlimited copying possible")", when the parameter is "01", it can be defined by the business operator, when the parameter is "10", it indicates "copying possible for only one generation", and when the parameter is "11", it indicates "copying prohibited". Only when the parameter is "00" indicating "copying possible without restrictions", it can be said that protection by the digital copy control information is not specified. When the parameter is "01", "10", or "11", it can be said that some protection by the digital copy control information is specified.

[0463] Also, Fig. 42 shows an example of the data structure of the content usage control descriptor in the broadcasting system of this embodiment. The "copy_restriction_mode" parameter in the figure is a copy restriction mode, and indicates whether or not a limited number of copies are possible (corresponding to "predetermined number of copies allowed" in the first embodiment). The value of the "encryption_mode" parameter of the content usage control descriptor shown in Fig. 42 is used to control protection (encryption) when outputting to the IP interface. If the value of the "encryption_mode" parameter is "0" indicating that protection is required (encryption required), encryption processing is performed when the content is output, and if the value is "1" indicating that protection is not required (encryption not required), the content may be output without protection (encryption processing).

[0464] The combination of the “digital_recording_control_data” parameter of the content copy control descriptor, the “encryption_mode” parameter of the content usage control descriptor, and the “copy_restriction_mode” parameter of the content usage control descriptor described above is a specific example of the configuration of the “copy control information” described in Example 1.

[0465] The broadcast receiving device 40100 of this embodiment simply acquires the ``digital_recording_control_data'' parameter of the content copy control descriptor and the ``copy_restriction_mode'' parameter of the content usage control descriptor described above, and uses these to determine output protection of the content output from the IP interface.

[0466] Next, the EOTF identification information used as one piece of the reception control information 50100 has already been described in detail in the third and fourth embodiments, and therefore will not be described again. Furthermore, the broadcast receiving device 40100 of this embodiment may determine output protection of the content output from the IP interface using not only the EOTF identification information as the reception control information 50100, but also the presence or absence or result of resolution conversion processing of the video of the content, the presence or absence or result of transfer characteristic conversion processing described in the third and fourth embodiments, or the presence or absence of storage processing of the content or the state after storage.

[0467] [Decision process for output protection of content on IP interface output in broadcast receiving device] An example of a process for determining whether to protect the output of content output from an IP interface in a broadcast receiving device will be described with reference to FIGS. 43, 44, and 45. FIG. First, Figure 43 shows the process of determining whether to protect the output of content when a broadcast receiving device 40100 receives content along with reception control information 50100 and outputs the content via an IP interface without performing resolution conversion processing or transmission characteristic conversion processing on the content image.

[0468] In Fig. 43, the main control unit 101 of the broadcast receiving device 40100 of this embodiment determines the output protection of the content when outputting through the IP interface based on the information included in the reception control information 50100. Specifically, the main control unit 101 determines the output protection of the content when outputting through the IP interface based on a combination of the "digital_recording_control_data" parameter of the content copy control descriptor, the "encryption_mode" parameter of the content usage control descriptor, the video resolution of the received content, and the transmission characteristic (EOTF) identification information. Below, an example of the determination for each combination will be described.

[0469] [Figure 43 Combination 1] In the example of combination 1 in Fig. 43, the "digital_recording_control_data" parameter of the content copy control descriptor indicates "copyable without restrictions," and the "encryption_mode" parameter of the content usage control descriptor indicates that the protection state when output from the IP interface is "not protected." In other words, this is a situation in which no copy restriction or output protection of the content is specified by any parameter.

[0470] In this case, whether the video resolution of the content exceeds 1920 pixels horizontally and 1080 pixels vertically (content exceeding the relevant number of pixels horizontally or vertically; hereafter referred to as "over 2K content"), whether the content is 1920 pixels horizontally and 1080 pixels vertically or less (content with either the relevant number of pixels horizontally or vertically or less; hereafter referred to as "2K or less content"), whether the transfer characteristic identification information indicates HDR or SDR, output protection of the content is not required when outputting through an IP interface. Copy control at the time of output is not required (effectively Copy Free), and encryption at the time of output is also not required, so naturally there is no need to add output control information for DTCP2. However, the content may be output after protection of DTCP1 (the above-mentioned "DTCP-IP") or DTCP2. In that case, the copy control state at the time of output may be set to "Copy Free" and encryption may be set to none. Furthermore, when outputting after protection of DTCP2, the output control information may be determined as follows. The "L2-Only" Flag is set to 0. The "EI" Flag is set to 0 for content of 2K or less and the transfer characteristic is SDR, and 1 for other content. The "HDR" Flag is set to 0. The "SDO" Flag is set to 1. That is, the protection level of the DTCP for the IP interface output may be either L1 level or L2 level, copy control is copy free, transfer characteristic conversion is not prohibited, and the content is output in a state in which it can be re-output in either the L1 level or L2 level protection state regardless of the state of the resolution or transfer characteristic. This means that the content is output in the lowest protection state of the output control states of the IP interface output in this embodiment.

[0471] [Figure 43 Combination 2 to 5] In the examples of combinations 2 to 5 in Figure 43, the “digital_recording_control_data” parameter of the content copy control descriptor indicates that “copying is permitted without restrictions,” and the “encryption_mode” parameter of the content usage control descriptor indicates that the protection state at the time of output to the IP interface is “protected.”

[0472] In this case, because the "encryption_mode" parameter of the content usage control descriptor specifies that protection is to be performed when outputting to the IP interface, output protection is performed using either DTCP2 or DTCP1 in any combination. In this case, the copy control state is set to "EPN," which indicates that there is no copy restriction but encryption is required, and encryption protection processing is performed. Here, whether the level of output protection processing, DTCP2 or DTCP1, is to be performed is determined according to the combination of the video resolution of the received content and the transfer characteristic (EOTF) identification information.

[0473] For example, in combination 5, the video resolution of the received content is 2K or less, and the transfer characteristic (EOTF) identification information is SDR. Since this is so-called HD quality content, conventional output protection is sufficient, and output protection is performed using DTCP1. In this case, naturally, output control information of DTCP2 is not added.

[0474] Additionally, in combinations 2, 3, and 4, either the video resolution of the received content is 2K or higher, or the transfer characteristic (EOTF) identification information is HDR. In this case, since the content has a picture quality exceeding HD quality, the content is protected using DTCP2, which is a more advanced level of output protection than DTCP1. In this case, the DTCP2 output control information to be added to the output content is determined as follows:

[0475] Here, the "L2-Only" Flag is set to 0 in any of the combinations 2, 3, and 4. If the "L2-Only" Flag is set to 1, even if the image quality is lowered to HD quality by pixel count conversion or transfer characteristic conversion processing in the output destination device, re-output is not possible unless L2 level content protection such as DTCP2 is performed. Depending on the device owned by the viewer, viewing may be impossible (e.g., the device owned by the viewer is not compatible with DTCP2), and this situation is not desirable for protecting "broadcast" content that is received simultaneously by many viewers. The above is the reason for setting the "L2-Only" Flag to 0. In any of the determinations of output control information of DTCP2 described below in this embodiment, the "L2-Only" Flag is set to 0 as a general rule for the same reason. However, as a variant, if broadcast content or broadcast service is divided into "free broadcast" and "paid broadcast", and this can be distinguished in the broadcast receiving device 40100, the "L2-Only" Flag for "free broadcast" may be set to 0, and the "L2-Only" Flag for "paid broadcast" may be set to 1. This is because the viewers of "paid broadcast" are limited, and an especially high level of protection is required for the content of "paid broadcast".

[0476] Additionally, the “EI” Flag is set to 1 in all combinations 2, 3, and 4. This is because either the video resolution of the received content is 2K or higher, or the transmission characteristic (EOTF) identification information is HDR, is met.

[0477] In addition, for the “HDR” Flag, in combinations 2 and 3, the “HDR” Flag is set to 0. In these combinations, the transfer characteristic (EOTF) identification information is HDR, and if output as is, the transfer characteristic of the content when output to the IP interface is also HDR. Here, if the “HDR” Flag is set to 1, the output destination device cannot convert the content to SDR content by performing transfer characteristic conversion processing. In this case, depending on the device owned by the viewer, viewing may be impossible (e.g., the device owned by the viewer is not compatible with HDR content). This situation is not desirable for protecting “broadcast” content that is received simultaneously by many viewers. The above is the reason for setting the “HDR” Flag to 0. In any of the determinations of output control information of DTCP2 in the following explanations of this embodiment, the “HDR” Flag is set to 0 in principle for the same reason. However, as a modified example, if the broadcast content or broadcast service is divided into “free broadcast” and “paid broadcast”, and this can be identified in the broadcast receiving device 40100, the “HDR” Flag may be set to 0 for “free broadcast” and 1 for “paid broadcast”. This is because the number of viewers of "pay TV" is limited, and there are service providers who believe that there is value in watching "pay TV" content in high-quality HDR quality.

[0478] As for the "HDR" Flag, in combination 4, the transfer characteristic (EOTF) identification information is SDR, and if output as is, the transfer characteristic of the content when output to the IP interface will also be SDR. Therefore, there is no need to add the "HDR" Flag, which indicates whether or not the transfer characteristic conversion process for HDR content to SDR is possible.

[0479] In additi...

Claims

[Claim 1] A method for protecting content in a transmission system in which a content having a resolution exceeding 1920 pixels horizontally and 1080 pixels vertically (hereinafter referred to as "exceeding 2K content") is transmitted as content of a broadcast program from a broadcast station and the exceeding 2K content is received by a receiving device, comprising: the transmission system does not transmit any of control information corresponding to an L2-Only flag of DTCP2, control information corresponding to an EI flag of DTCP2, control information corresponding to an HDR flag of DTCP2, and control information corresponding to an SDO flag of DTCP2 from a broadcasting station side to a receiving device; a transmitting step of transmitting the 2K+ content of the broadcast program from the broadcast station side to the receiving device in the transmission system; a receiving step in which the receiving device receives the 2K content transmitted in the transmitting step; a storage step in which the receiving device stores the 2K content received in the receiving step; an output step of outputting the ultra-2K content stored in the storage step as the ultra-2K content via an interface of the receiving device; Equipped with When the over 2K content received in the receiving step is a content transmitted in the transmission system with one-generation copy protection or a content transmitted in the transmission system with number-limited copy protection, the over 2K content received in the receiving step is made playable only by the receiving device and is stored in the storing step, When the receiving device outputs the ultra 2K content stored in the storage step as ultra 2K content by protecting the content by DTCP2 via the interface by setting, in the output step, 1-bit L2-Only flag, 1 bit EI flag, 1 bit HDR flag, and 1 bit SDO flag, which are DTCP2 control information, the receiving device sets 1 bit of the L2-Only flag, 1 bit of the EI flag, 1 bit of the HDR flag, and 1 bit of the SDO flag of DTCP2 for the ultra 2K content to be output via the interface without acquiring, from the transmission system, any of control information corresponding to the L2-Only flag of DTCP2, control information corresponding to the EI flag of DTCP2, control information corresponding to the HDR flag of DTCP2, and control information corresponding to the SDO flag of DTCP2, When the over 2K content is received in the receiving step, whether the over 2K content is a content that has been transmitted with one-generation copy protection specified in the transmission system or the over 2K content is a content that has been transmitted with number-limited copy protection specified in the transmission system, when the over 2K content stored in the storing step is output as the over 2K content through the interface in the outputting step after content protection by DTCP2, the L2-Only flag of DTCP2 is fixed to 0, When the ultra-2K content stored in the storage step is protected by DTCP2 via the interface in the output step and output as ultra-2K content, the settings of the 1-bit L2-Only flag, EI flag, HDR flag, and SDO flag, which are DTCP2 control information, do not change when transmission characteristic information indicating the transmission characteristics of the ultra-2K content indicates HDR transmission characteristics, even if the ultra-2K content is a content transmitted in a state indicating that the ultra-2K content may be copied without restrictions in the transmission system and requires protection by encryption at the time of output, even if the ultra-2K content is a content transmitted in the transmission system with protection specified for one-generation copy only, or even if the ultra-2K content is a content transmitted in the transmission system with protection specified for number-limited copying. How we protect your content.

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