WO2016185814A1 - Dispositif d'émission, procédé d'émission, dispositif de réception et procédé de réception - Google Patents

Dispositif d'émission, procédé d'émission, dispositif de réception et procédé de réception Download PDF

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Publication number
WO2016185814A1
WO2016185814A1 PCT/JP2016/061068 JP2016061068W WO2016185814A1 WO 2016185814 A1 WO2016185814 A1 WO 2016185814A1 JP 2016061068 W JP2016061068 W JP 2016061068W WO 2016185814 A1 WO2016185814 A1 WO 2016185814A1
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WIPO (PCT)
Prior art keywords
emergency
information
display
broadcast
service
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PCT/JP2016/061068
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English (en)
Japanese (ja)
Inventor
北里　直久
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ソニー株式会社
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Publication of WO2016185814A1 publication Critical patent/WO2016185814A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/13—Arrangements for device control affected by the broadcast information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H04H60/42—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast areas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/488—Data services, e.g. news ticker
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/633—Control signals issued by server directed to the network components or client
    • H04N21/6332—Control signals issued by server directed to the network components or client directed to client

Definitions

  • the technology disclosed in this specification relates to a transmission apparatus and transmission method for transmitting emergency information, and a reception apparatus and reception method for receiving emergency information.
  • An object of the technology disclosed in the present specification is to provide a transmitting device and a transmitting method for transmitting emergency information, and a receiving device and a receiving method for receiving emergency information.
  • a transmission unit for transmitting assets constituting the broadcast service A control information transmitter for transmitting emergency information in control information related to a broadcast service; It is the transmitter which comprises.
  • control information transmission unit of the transmission device is configured to include information related to a target area in the emergency information and transmit the information. Yes.
  • control information transmission unit of the transmission device includes emergency service information related to display control of an emergency broadcast service in the emergency information. Are configured to transmit.
  • control information transmission unit of the transmission device includes information instructing a full-screen display of a broadcast service in the emergency service information. Configured to send.
  • control information transmission unit of the transmission device includes information for instructing termination of an application included in the emergency service information to be transmitted. It is configured.
  • control information transmission unit of the transmission device is configured to specify whether to forcibly switch to an emergency broadcast service, and Information for identifying the emergency broadcast service is included in the emergency service information and transmitted.
  • the control information transmission unit of the transmission device automatically performs emergency broadcast service when there is an activation instruction even when the power is turned off.
  • Information indicating a channel selection instruction is included in the emergency service information and transmitted.
  • control information transmission unit of the transmission device is configured to transmit information related to a target area included in the emergency service information. ing.
  • control information transmission unit of the transmission device is configured to transmit information related to an emergency message included in the emergency information. Yes.
  • control information transmission unit of the transmission device is configured to transmit information indicating display priority included in the emergency message. Has been.
  • control information transmission unit of the transmission device is configured to transmit information related to a target area included in the emergency message. Yes.
  • control information transmission unit of the transmission device performs display control (display area and size, font size, font The information regarding the type and the display method is included in the emergency message and transmitted.
  • control information transmitting unit of the transmission device is configured to transmit the link information to detailed information included in the emergency message. Has been.
  • the fourteenth aspect of the technology disclosed in this specification is: A transmission step of transmitting assets constituting the broadcast service; A control information transmission step of transmitting emergency information in the control information related to the broadcast service; Is a transmission method.
  • a receiving unit for receiving assets constituting a broadcasting service A control information receiving unit for receiving control information related to a broadcast service including emergency information; A control unit that controls screen display of a broadcast service based on the control information; It is the receiver which comprises.
  • control unit of the receiving device is responsive to the emergency information instructing a full-screen display of a broadcast service,
  • the broadcast service received by the receiving unit is configured to be displayed on a full screen.
  • control unit of the reception device is configured so that the reception unit is responsive to the emergency information instructing termination of an application. It is configured to terminate the execution of the received data broadcast application.
  • the eighteenth aspect of the technology disclosed in this specification is: A receiving step of receiving assets constituting the broadcast service; A control information receiving step for receiving control information related to a broadcast service including emergency information; A control step for controlling the screen display of the broadcast service based on the control information; Is a receiving method.
  • the nineteenth aspect of the technology disclosed in this specification is: A transmission unit for transmitting assets constituting the broadcast service; A control information transmission unit that transmits display priority designation information including control information related to a broadcast service; It is the transmitter which comprises.
  • a receiving unit for receiving assets constituting a broadcasting service A control information receiving unit for receiving control information related to a broadcast service including display priority designation information; A control unit that controls screen display of the broadcast service based on the display priority designation information; It is the receiver which comprises.
  • a receiving device and a receiving method that can receive emergency information as control information related to a broadcast service and can make an emergency notification to a user (viewer). it can.
  • FIG. 1 is a diagram schematically illustrating a configuration example of a digital broadcasting system 10.
  • FIG. 2 is a diagram showing a protocol stack 200 in the digital broadcasting system 10 using the MMT method.
  • FIG. 3 is a diagram showing an image of a broadcast signal 300 according to the MMT method.
  • FIG. 4 is a diagram showing a mechanism for designating each asset related to the broadcast service from the MP table in the PA message.
  • FIG. 5 is a diagram for explaining a mechanism for acquiring a file related to a data broadcast transmitted by MMT.
  • FIG. 6 is a diagram showing a service packet configuration example assumed in the MMT / TLV broadcasting system.
  • FIG. 7 is a diagram illustrating an example syntax 700 of the M2 section message.
  • FIG. 1 is a diagram schematically illustrating a configuration example of a digital broadcasting system 10.
  • FIG. 2 is a diagram showing a protocol stack 200 in the digital broadcasting system 10 using the MMT method.
  • FIG. 3 is a diagram showing an
  • FIG. 8 is a diagram illustrating a syntax example 800 of the control information table EAT for designating emergency information.
  • FIG. 9 is a diagram illustrating an example syntax 900 of an emergency service descriptor.
  • FIG. 10 is a diagram illustrating a syntax example 1000 of the emergency caption display descriptor.
  • FIG. 11 is a diagram illustrating a syntax example 1100 of the emergency information link descriptor.
  • FIG. 12 is a diagram illustrating a syntax example 1200 of the target area descriptor.
  • FIG. 13 is a diagram showing a syntax 1300 of an area designator designated by a prefecture area.
  • FIG. 14 is a diagram illustrating a screen display control example (an emergency broadcast service display example using an emergency service descriptor) according to an emergency notification table in the receiver.
  • FIG. 15 is a diagram illustrating a screen display control example (an emergency broadcast service display example using an emergency service descriptor) according to an emergency notification table in the receiver.
  • FIG. 16 is a diagram illustrating a screen display control example (an emergency broadcast service display example using an emergency service descriptor) according to an emergency notification table in the receiver.
  • FIG. 17 is a diagram showing a screen display control example (an emergency broadcast service display example using an emergency service descriptor) according to an emergency notification table in the receiver.
  • FIG. 18 is a diagram showing an example of regional filtering for emergency broadcast service display.
  • FIG. 19 is a diagram illustrating a display switching scenario to the emergency broadcast service.
  • FIG. 20 is a diagram illustrating a screen display control example of emergency subtitles using an emergency message.
  • FIG. 21 is a diagram illustrating an example of regional filtering for emergency subtitle display.
  • FIG. 22 is a diagram illustrating an emergency subtitle display switching scenario.
  • FIG. 23 is a diagram illustrating a configuration example of the broadcast transmission system 11.
  • FIG. 24 is a diagram illustrating a configuration example of the receiver 12 that receives a broadcast signal from the broadcast transmission system 11.
  • FIG. 25 is a diagram for explaining a mechanism for generating a display screen in the receiver 12.
  • FIG. 26 is a diagram for explaining a mechanism for generating a display screen in the receiver 12.
  • FIG. 27 is a flowchart illustrating an example of a procedure for processing the emergency notification table (EAT) in the receiver 12.
  • FIG. 28 is a flowchart illustrating an example of a procedure for processing the emergency notification table (EAT) in the receiver 12.
  • FIG. 29 is a diagram illustrating a syntax example 2900 of the MP table.
  • FIG. 30 is a diagram illustrating a syntax example 3000 of the display priority designation descriptor.
  • FIG. 31 is a diagram showing an example of screen display control using a display priority designation descriptor.
  • FIG. 32 is a diagram illustrating another example of the screen display control using the display priority designation descriptor.
  • FIG. 33 is a diagram showing an example of regional filtering of the broadcast service full screen display.
  • FIG. 34 is a diagram illustrating an unconditional broadcast service full screen scenario.
  • FIG. 35 is a diagram exemplifying a broadcast service full screen scenario with conditions.
  • FIG. 36 is a flowchart showing an example of a procedure for processing the display priority designation descriptor arranged in the MP table.
  • One of the responsibilities of the requirement broadcasting of the technology disclosed in this specification is to promptly transmit emergency information for various disasters and incidents.
  • the digital broadcasting standard also defines a technical support function for transmitting emergency information.
  • the present applicant considers that the current broadcasting service does not sufficiently play a role in the notification of emergency information.
  • Urgent information has regional characteristics. In the event of an emergency, there is a demand for prompt notification of emergency information by subtitles, etc., on a regional basis. However, when a normal broadcast screen such as a TV program video or a data broadcast display overlaps with subtitles, emergency information is difficult to see or becomes inconspicuous, so it does not function effectively.
  • the Applicant lists the following (1) to (3) as requirements for emergency notification in broadcasting services.
  • the broadcast screen When making an emergency notification in a broadcast service, even if a display other than the broadcast screen is displayed on the TV screen, the broadcast screen is automatically switched to be displayed on the full screen of the TV screen (broadcast full screen display). control). In an emergency, viewers can be alerted by displaying the broadcast screen in full screen. In addition, after the emergency notification is finished, the TV screen returns to the state before the emergency notification. (2) The operation of switching to the full screen display of (1) is performed only in the area targeted for emergency notification.
  • the emergency information subtitles are promptly displayed at an easily viewable position on the TV screen.
  • Subtitles for emergency information can be designated to be displayed at a position that does not overlap with a normal broadcast screen (display of TV program video and data broadcast).
  • Subtitles for emergency information are displayed only in the area targeted for emergency notification.
  • the applicant further lists the following (7) and (8) as requirements for controlling the TV screen to display a full screen broadcast as described in (1) above.
  • (7) and (8) as requirements for controlling the TV screen to display a full screen broadcast as described in (1) above.
  • the timing for switching to full screen display is not necessarily the same in all TV receivers.
  • the timing for switching to full screen display may be determined according to the application operation for each receiver.
  • stream media of broadcast programs such as video, audio, and subtitles are transmitted in a Timed MPU (Media Processing Unit) format, while data broadcasting applications are transmitted in a non-timed MPU format.
  • the transmission method is also defined.
  • the broadcasting station performs signaling (notification) of MMT-SI (Signaling Information), which is control information related to the broadcast service (see, for example, Patent Document 2).
  • FIG. 1 schematically shows a configuration example of the digital broadcasting system 10.
  • the illustrated digital broadcast system 10 includes a broadcast transmission system 11 and a receiver 12.
  • the broadcast transmission system 11 applies the MMT system for transmission of broadcast signals, and transmits each component constituting the broadcast service as an IP (Internet Protocol) packet. Specifically, the broadcast transmission system 11 puts the video signal and audio signal codes of a broadcast program, content (data broadcast application, etc.) related to the broadcast program, and subtitle signals into an MMTP payload into an MMTP packet. Further, it is converted into an IP packet and transmitted in the form of a TLV (Type Length Value) packet on the broadcast transmission path.
  • TLV Type Length Value
  • components related to the broadcast program main body such as video, audio, and subtitles are timed media.
  • content that is, a data broadcasting application encoded in HTML (Hyper Text Transfer Protocol) 5 format or the like is non-timed media.
  • the broadcast transmission system 11 also performs MMT-SI signaling, which is control information related to a broadcast service that distributes timed and non-timed media.
  • the MMT-SI includes a message, a table, and a descriptor.
  • the table is transmitted as a container for messages. Some parameters shown in messages and tables are described in descriptor format.
  • the receiver 12 receives the TLV packet sent from the broadcast transmission system 11 through the broadcast transmission path.
  • the receiver 12 then decodes transmission media such as video, audio, and subtitles from the received packet and presents images and audio. Further, when the receiver 12 acquires each data file for data broadcasting from the received packet, the receiver 12 starts an application engine such as an HTML browser and displays the data broadcast linked to the broadcast program and the video of the TV program. Display in part or all of the screen area.
  • the receiver 12 also receives MMT-SI that is control information related to the broadcast service. Based on the MMT-SI, the receiver 12 performs reception control of transmission media such as video, audio, captions, and data broadcasting, and output (display, audio output) control on the receiver 12.
  • MMT-SI that is control information related to the broadcast service.
  • the receiver 12 Based on the MMT-SI, the receiver 12 performs reception control of transmission media such as video, audio, captions, and data broadcasting, and output (display, audio output) control on the receiver 12.
  • FIG. 2 shows a protocol stack 200 in the digital broadcasting system 10 using the MMT method.
  • One broadcast service is composed of video 201, audio 202, subtitle 203, application 204, and content / download 205 components.
  • the video 201 is encoded 211 in the HEVC (High Efficiency Video Coding) format
  • the audio 202 is encoded 212 in the AAC (Advanced Audio Coding) format
  • the subtitle 203 is subtitle encoded 213.
  • the application 204 includes EPG (Electric Program Guide), but is encoded 214 in, for example, HTML5 format.
  • these timed media and non-timed media encoding components 211 to 214 are converted into the MMTP packet in the MPU format and carried on the MMTP payload.
  • MMT-SI 221 which is control information related to MMT which is a media transport system (indicating the configuration of a broadcast program) is also put into an MMTP packet on the MMTP payload. Details of the control information MMT-SI related to the MMT will be described later.
  • the MMTP packet is converted into an IP packet.
  • An NTP (Network Time Protocol) packet 206 including information on the current time for timed media is also converted into an IP packet. Further, these IP packets are converted into TLV packets in the TLV layer 240 and transmitted through the broadcast transmission path 250 which is the lowermost physical layer.
  • a TLV-SI 241 related to a TLV multiplexing format for multiplexing IP packets is also converted into a TLV packet and transmitted through the broadcast transmission path 250.
  • the transmission slot in which the TLV packet is multiplexed is specified by using TLV stream identification information (TLV_stream_id) from a TMCC (Transmission and Multiplexing Configuration Control) signal 251 of the transmission path.
  • TLV_stream_id TLV stream identification information
  • TMCC Transmission and Multiplexing Configuration Control
  • FIG. 3 shows an image of a broadcast signal 300 transmitted from the broadcast transmission system 11 to the broadcast transmission path according to the MMT method.
  • the broadcast signal of one service is composed of timed media related to the main part of a broadcast program such as video, audio, and subtitles, and non-timed media such as data broadcasting. Corresponding to broadcast programs).
  • Media data obtained by encoding these media is converted into MMTP packets in the MPU format and transmitted as IP packets.
  • MMT-SI which is control information related to MMT, which is a media transport system (indicating the configuration of a broadcast program)
  • IP packets are transmitted as TLV streams in the form of TLV packets on the broadcast transmission path.
  • Signaling information (TLV-SI) related to the TLV multiplexing format for multiplexing IP packets is also transmitted in the TLV packet format.
  • MMT transmission paths 301 to 305 for each type of data such as video, audio, caption, data broadcast, and control information (MMT-SI) related to broadcast service are used.
  • MMT-SI control information
  • Each MMT transmission line corresponds to one IP data flow.
  • the IP data flow referred to here is that the values of the five types of fields of the IP header and the UDP header in the source IP address, destination IP address, IP header protocol type, source port number, and destination port number are all the same. Is a set of IP packets.
  • One broadcasting service can be said to be a “package” composed of a plurality of different types of assets such as video, audio, captions, and data broadcasting applications.
  • the “package” referred to here is a logical set of media data transmitted using the MMT transmission path.
  • “Assets” have a corresponding relationship with components (video assets correspond to video components, audio assets correspond to audio components, subtitle assets correspond to subtitle components, and data for data broadcasting applications.
  • File assets correspond to data file components). Each asset is identified by unique asset identification information (asset_id).
  • Each asset is composed of a set (logical group) of one or more MPUs sharing the same asset identification information.
  • MPU is a format that is a transmission unit in the MMT system.
  • Each MPU is specified by asset identification information and the sequence number of the MPU on the corresponding transmission path.
  • the MMT transmission path for transmitting each medium (asset) such as video, audio, caption, and data broadcasting application can be identified by asset identification information.
  • Each MPU related to the same broadcast service is transmitted on a dedicated ES (Elementary Stream), that is, MMT transmission paths 301 to 305 to each asset in the package, that is, the broadcast signal 300.
  • the transmission path 301 transmits an MMTP packet of an encoded video signal composed of an MPU logical group having common asset identification information for a video signal.
  • an MMT packet of an encoded audio signal composed of an MPU logical group having common asset identification information for audio signals is transmitted on the transmission path 302, and has common asset identification information for subtitle signals on the transmission path 303.
  • An MMTP packet of an encoded subtitle signal made up of an MPU group is transmitted, and an MMTP packet of an encoded application made up of an MPU logical group having asset identification information common to each of data transmission applications on transmission paths 304-1 and 304-2. Is transmitted.
  • each asset has different asset identification information and is transmitted through a dedicated ES, that is, an MMT transmission path.
  • a dedicated ES that is, an MMT transmission path.
  • asset identification information is allocated to each delivery segment and transmitted by different ESs.
  • a program-linked data broadcasting application linked to a broadcast program provided from a key station that produced the program, and a program non-linked data not linked to a broadcast program provided from a local station that distributes the program.
  • Broadcast applications for example, weather forecasts and news
  • transmission paths 304-1 and 304-2 are drawn for two data broadcasting applications to which different asset identification information is allocated.
  • the MMT method can be used in common for a plurality of broadcast and communication transmission paths.
  • non-timed media such as data broadcasting (HTML5 document, etc.) is transmitted together with timed media of the same broadcasting service using the transmission paths 304-1 and 304-2 of the broadcast signal 300 as shown in FIG.
  • a communication transmission path (not shown) such as an IP network.
  • the transmission path 305 is used for signaling in the MMT system, that is, for transmitting MMT-SI, which is control information indicating information related to the configuration of the MMT package and the broadcast service.
  • MMT-SI which is control information indicating information related to the configuration of the MMT package and the broadcast service.
  • an MMT message including MMT-SI is converted into an MMTP packet and repeatedly transmitted by the carousel method.
  • FIG. 3 the illustration of the transmission line for TLV-SI is omitted.
  • Control information MMT-SI related to broadcast services is roughly classified into MMT-SI for each broadcast service and MMT-SI applied across a plurality of broadcast services (that is, across services).
  • the former MMT-SI of the broadcast service unit is transmitted through the transmission path 305 in the same broadcast signal (package) 300 as other components of the same broadcast service, and is applied only to the same broadcast service.
  • the latter MMT-SI across services is transmitted through a transmission path 306 different from the transmission path 305.
  • the cross-service MMT-SI referred to here is an MMT-SI applied across a plurality of broadcast services provided by the same operator.
  • MMT-SI has messages, tables, and descriptors.
  • Examples of the service unit MMT-SI message transmitted through the transmission path 305 include a PA message 310, an M2 section message 320, and a data transmission message 330.
  • examples of the message of service crossing MMT-SI transmitted through the transmission path 306 include a PA (Package Access) message, an M2 section message, an M2 short section message, and a CA (Conditional Access) message.
  • the data transmission message is an MMT-SI message in service units.
  • the PA message and M2 section message may be service unit or service crossing.
  • the CA message is an MMT-SI message across services, and is used as a table container used for identification of the conditional access system.
  • the PA message 310 is control information indicating the configuration of a broadcast program and the like, and is a container that stores an MP (MMT Package) table 311 that describes information that configures a package such as an asset list and its position.
  • MP MMT Package
  • the MP (MMT Package) table 311 is a table indicating basic reception control information for each broadcast service, and specifically provides information constituting the package, such as an asset list and asset location information.
  • the MP table 311 includes MPT descriptors such as application service descriptors.
  • the application service descriptor indicates location information of control information necessary or important for the operation of the data broadcasting application (for example, location information of each M2 section message that transmits a data transmission message, MH-AIT, and EMT, respectively).
  • the PA message 310 is an entry point of the broadcast service, and fixed packet identification information (for example, 0x0000) is assigned to the MMTP packet that transmits the PA message 310.
  • the MP table transmitted by the PA message indicates asset identification information and location information of each asset (video, audio, caption, data broadcasting application, etc.) constituting the package (broadcast program). Therefore, on the receiver side, the PA message 310 can be acquired by directly specifying the fixed packet identification information on the MMT transmission path 304. Then, with reference to the MP table 311 transmitted by the PA message 310, each asset (video, audio, caption, data broadcast location information) constituting the package (broadcast program) can be indirectly specified.
  • examples of tables stored in the PA message 310 include a PL (Package List) table (PLT) and an LC (Layout Configuration) table (LCT) in addition to the MP table.
  • PLT indicates a list of IP data flows and packet IDs for transmitting PA messages of MMT packages provided as broadcasting services, and IP data flows for transmitting IP services.
  • the LCT is used to associate layout information for presentation with a layout number.
  • the PA message is a container that can store up to three tables: an MP table, a PL table, and an LC table.
  • the M2 section message 320 is a message that transmits the section extension format of MPEG-2 Systems, and is a container that stores the section format signaling table one by one.
  • tables such as an MH-AIT (Application Information Table) 321 and an EMT (Event Message Table) 322 are stored one by one.
  • the MH-AIT 321 is a table for designating dynamic control information related to an application and additional information necessary for execution.
  • the MH-AIT 321 is a method for processing each data broadcast application (file data) sent through the MMT transmission path. Specify the location information (URL: Uniform Resource Locator) of each data broadcasting application (such as the activation state applied to the application).
  • URL Uniform Resource Locator
  • AS AUTOSTART
  • PR PRESENT
  • KILL indicating the end of the application
  • pre-cache acquisition and holding
  • the EMT 322 is a signaling table used for the event message transmission method, and stores information (event message descriptor) regarding the event message (synchronous / asynchronous message from the broadcasting station to the application on the receiver).
  • the event / message transmission system provides a means for sending message information from a broadcasting station to a data broadcasting application operating on a receiver immediately or at a specified time.
  • a control information table called EAT (Emergency Alerting Table) used for transmitting emergency information is stored in an M2 section message and transmitted.
  • the MH-AIT and EMT are transmitted as MMT-SI for each service in the M2 section message.
  • the EAT is transmitted as an MMT-SI across services in an M2 section message.
  • the data transmission message 330 is a message for transmitting control information related to transmission of the data broadcasting application.
  • the data transmission message 530 includes a data directory management table (Data Directory management Table: DDMT) 331, a data asset management table (Data Asset Management Table: DAMT) 332, a data content management table (Data Content ConfigurationTable 33: DCT).
  • DDMT Data Directory management Table
  • DAMT Data Asset Management Table
  • DCT Data Content ConfigurationTable
  • the data directory management table 331 is a table for managing the data broadcast application in a directory unit (in other words, a production unit of the data broadcast application).
  • the table describes the directory structure for items (directories and subdirectories and files included in a directory) included in one package, so that the file structure of the application and the structure for file transmission can be separated. it can.
  • the table shows the correspondence between the path name of each node, such as a directory or file, and the node tag that identifies each node in the data transmission message.
  • the data / asset management table 332 is a table for managing the data broadcasting application in units of assets, and describes version information for each MPU including the configuration of the MPU in the asset. Specifically, the table shows download identification information of each component, and a node tag and node on the MMT transmission path that identify a node (file or directory) included in each MPU that transmits the component in the data transmission message. The correspondence with the item identification information to identify is shown.
  • the data / content management table 333 is a table for managing a data broadcasting application for each presentation unit (PU).
  • the table shows presentation unit identification information for identifying a data broadcasting application for each presentation unit, and a node tag for identifying a node (file or directory) included in each presentation unit in a data transmission message.
  • the table can include link destination presentation unit identification information for identifying a presentation unit linked to the presentation unit, and information on cache control of each presentation unit. Can be used for flexible and effective cache control.
  • the transmission data structure of the file unit and the directory structure in contents (data broadcasting application) production can independently represent the data structure of usage units such as application units and presentation units.
  • the configuration of each of the signaling tables 331 to 333 is defined by ARIB STD B-60.
  • Packet identification information of messages and tables transmitted as MMT-SI may be fixed or indirectly specified from other tables.
  • the PA message is an entry point of the broadcast service, and fixed packet identification information (for example, 0x0000) is assigned.
  • the MP table transmitted by the PA message indicates asset identification information and location information of each asset (video, audio, caption, data broadcasting application, etc.) constituting the package (broadcast program). Therefore, the receiver side can acquire the PA message by designating the fixed packet identification information on the MMT transmission path. Then, referring to the MP table transmitted in the PA message, as shown in FIG. 4, each asset (video, audio, caption, data broadcasting application, etc.) related to the broadcasting service and other signaling messages are indirectly Can be specified.
  • location information of a data broadcasting application is described in a URL format, in other words, a path name composed of a combination of a directory node name and a file name.
  • the asset path name can be converted into identification information (packet identification information) on the MMT transmission path using the data directory management table and the data asset management table transmitted in the data transmission message.
  • a mechanism for acquiring a data broadcasting application from the MMT transmission path is described in detail in, for example, Japanese Patent Application No. 2014-250279 already assigned to the present applicant. In this specification, a mechanism for acquiring data broadcast application items multiplexed in the same IP data flow on the broadcast signal receiver side will be briefly described with reference to FIG.
  • the receiver can acquire the location information, that is, the path name, of the application for which “autostart (automatic start)” is instructed from the MH-AIT transmitted by the M2 section message.
  • the node tag of the file corresponding to the specified path name can be obtained from the data directory management table in the data transmission message.
  • the location information of the asset having the component tag obtained in the data asset management table is acquired from the MP table as indicated by the reference number 503, the corresponding file is actually stored as indicated by the reference number 504.
  • the data asset to be transmitted can be identified.
  • the file identification corresponding to the carousel is repeated using the download identification information obtained from the data asset management table and the download identification information described in the header area of the MMTP packet for transmitting the item.
  • the unit of transmission can be uniquely identified.
  • an item having an MPU sequence number and item identification information obtained from the data / asset management table among items repeatedly transmitted can be designated as a desired file.
  • the first embodiment is intended to realize the requirements (1) to (6) described above for emergency notification in broadcasting services.
  • emergency information is transmitted as a control information table called EAT (emergency notification table).
  • the broadcaster broadcast station
  • the EAT may be transmitted by the service unit MMT-SI.
  • the service unit MMT-SI On the receiver side, regardless of which broadcast service is received, it is acquired every time the EAT is updated on the transmission path for cross-service MMT-SI, and emergency information is obtained according to the control information specified by the EAT. Can be announced.
  • control information table EAT the following items (11) to (15) are designated as control information of the broadcast service corresponding to an emergency. A specific syntax example of EAT will be described later.
  • Broadcast service identification information (12) Information for instructing broadcast full-screen display (13) Automatic channel selection instruction information for emergency broadcast service (14) Emergency when there is an activation instruction even when the power is turned off Automatic channel selection instruction information to broadcasting service (15) Area filtering information that validates the above instructions (11) to (14) (or indicates an area subject to emergency notification)
  • control information table EAT the following items (21) to (25) are further specified as information for controlling the display of emergency subtitles as an emergency display message.
  • Text information to be displayed in subtitles (21) Text information to be displayed in subtitles (22) Information on display area for displaying subtitles (on the broadcast screen) (area size, subtitle font size, font color) (23) Display control instruction information such as subtitle display operation mode (24) Regional filtering information for enabling subtitle display (25) Link information to various types of detailed information
  • FIG. 6 shows a service packet configuration example assumed in the MMT / TLV broadcasting system.
  • the figure shows an example of a packet configuration when the same broadcaster provides a plurality of broadcast services (# 1 to #N).
  • the IP data flow for each service and the SI that transmits the MMT-SI across services are shown. Includes dedicated IP data flow.
  • components transmitted in the same IP data flow are surrounded by dotted lines.
  • a fixed value of the packet identification information is entered in the component in which the packet identification information (PID) is fixed in the IP data flow.
  • PID packet identification information
  • the reference relationship is indicated by an arrow.
  • Each of the broadcast services # 1 to #N has assets such as video (Video MPU), audio (Audio MPU), caption (caption MPU), data broadcasting application (App MPU), PA message (PA Mes), and data transmission. Consists of MMT-SI including message (DT Mes). In these components, a specific IP address mapped for each broadcast service is mapped and transmitted in one IP data flow.
  • MMT-SI messages and tables common to all broadcast services # 1 to #N are transmitted in an IP data flow dedicated to SI. It is assumed that a fixed IP address and a UDP port number (pn) are mapped to the IP data flow dedicated to SI.
  • an M2 section message serving as a container of the control information table EAT for designating emergency information is transmitted using an IP data flow dedicated to SI.
  • each table of NIT Network Information Table
  • AMT Address Map Table
  • the PLT in the PA message transmitted in the SI-dedicated IP data flow is a list of the IP data flow and packet ID for transmitting the PA message of the MMT package provided as a broadcast service, and the IP data flow for transmitting the IP service. Is shown.
  • the MP table transmitted by the PA message includes each signaling (transmission) such as each asset (video, audio, caption, data broadcast, etc.), data transmission message, and M2 section message. Since the table is indirectly specified, the receiver can execute processing such as reception of a broadcast program and presentation of a data broadcast application using the MP table.
  • the IP address and port number of the IP data flow dedicated to SI are constant. If the packet ID of the M2 section message that is a container of the control information table EAT that specifies emergency information is fixed, the receiver can easily monitor the EAT transmitted by the IP data flow dedicated to SI.
  • FIG. 7 shows a syntax example 700 of the M2 section message.
  • the M2 section message is a signaling message used for transmitting the section extension format of the MPEG-2 System as it is.
  • the M2 section message serves as a container for transmitting the control information table EAT for designating emergency information using an IP data flow dedicated to SI.
  • the meaning of each parameter of the M2 section message will be described.
  • Message_id (message identification) is a 16-bit fixed value for identifying the M2 section message in various signaling information, and is set to 0x8000.
  • version (version) is an 8-bit integer parameter indicating the version of the M2 section message.
  • the length (message length) is a 16-bit parameter indicating the size of the M2 section message counted in bytes immediately after this field.
  • table_id (table identification) is an area used for identifying the table to which the section belongs.
  • the section_syntax_indicator (section syntax instruction) is set to “1” indicating the extended format.
  • Section_length (section length) is an area in which the byte length of data following the section length area is written.
  • the table_id_extension (table identification extension) is an area for extending table identification.
  • version_number (version number) is an area in which the version number of the table is written.
  • the current_next_indicator (current next instruction) is set to “1” when the table is currently usable, and is set to “0” when the table is currently unusable and next valid.
  • Section_number (section number) is an area in which section numbers constituting the table are written.
  • the last_section_number (last section number) is an area in which the last section number constituting the table is written.
  • FIG. 8 shows a syntax example 800 of the control information table EAT for designating emergency information.
  • the meaning of each parameter of EAT will be described.
  • Table_id (table identification) is an 8-bit fixed value that identifies an emergency notification table (EAT) in various signaling information.
  • the section_syntax_indicator (section syntax instruction) is a 1-bit field and is always “1”.
  • sectoin_length (section length) is a 12-bit field and defines the byte length of the section from the section length field to the end of the section including CRC32.
  • the emergency_region_map is a 16-bit field for designating the target area of the emergency notification table using a bitmap of the divided areas. Specifically, Japan (or a broadcast service area) is divided into 16 regions corresponding to the bit length of emergency_region_map, and each bit position of the bitmap is assigned to each region. The presence / absence of application of the emergency notification table to each region is expressed by the value of the corresponding bit position. By referring to emergency_region_map, it is possible to overlook the target area of the emergency notification table. When all regions are targeted (in other words, when region filtering is not performed), emergency_region_map is set to all ‘1’.
  • the emergency_region_map is used for primary filtering that determines whether or not to apply the emergency notification table itself on the receiver side.
  • the emergency_region_map can realize the emergency notification operation limited to the area targeted for the emergency notification described above as the emergency notification requirement (2).
  • the emergency notification table can include one or more emergency messages (described later), each emergency message has regional filtering information, and the receiver can also perform secondary filtering for each emergency message.
  • Version_number is a 5-bit field indicating the version number of the emergency notification table, and is incremented by +1 when there is a change in the information in the sub-table.
  • the current_next_indicator current next instruction is always “1”.
  • the section_number (section number) is an 8-bit field and represents a section number.
  • the last_section_number (last section number) is an 8-bit field that defines the last section number in the subtable to which the section belongs.
  • Descriptor_loop_length (descriptor loop length) is a 12-bit field, and indicates the byte length of the subsequent descriptor (descriptor) loop.
  • a descriptor area indicated by reference number 801 stores a descriptor that is applied to the entire target (region) subjected to primary filtering with the emergency_region_map. In this descriptor area, for example, an emergency service descriptor or an emergency caption display descriptor can be arranged. Details of these descriptors will be described later.
  • Number_of_message is an 8-bit field indicating the number of emergency messages included in the emergency notification table. In the subsequent loop for the number of emergency messages (number_of_message), information on each emergency message is described.
  • Message_id is the serial number of the emergency message in the emergency notification table.
  • priority indicates the priority of the emergency message (the display priority of the emergency message in a plurality of emergency messages).
  • the message_length indicates the data length of the emergency message in bytes.
  • a display emergency message (emergency subtitle) is described in units of bytes.
  • the display emergency message includes text information (char).
  • Message_descriptor_loop_length is a 12-bit field indicating the byte length of the subsequent emergency message descriptor loop.
  • the emergency message descriptor area indicated by reference numeral 802 stores a descriptor that is applied to the entire target (region) subjected to primary filtering with the emergency_region_map. In this emergency message descriptor area, a descriptor for each emergency message is arranged.
  • the target area descriptor that specifies the target area for each emergency message the emergency caption display descriptor that specifies the subtitle attribute for each emergency message, and the emergency that indicates link information to detailed information for each emergency message List information link descriptions. Details of these emergency message descriptors will be given later.
  • FIG. 9 shows a syntax example 900 of the emergency service descriptor arranged in the descriptor area 801 in the emergency notification table (EAT).
  • the emergency service descriptor is a descriptor that designates an emergency broadcast service (hereinafter also referred to as “emergency broadcast service”), and is applied to the entire target (region) subjected to primary filtering with emergency_region_map.
  • emergency broadcast service an emergency broadcast service
  • Descriptor_tag indicates a 16-bit fixed value for identifying that the descriptor is an event message descriptor.
  • Descriptor_length is an 8-bit field indicating the byte length from immediately after this field to the end of the descriptor.
  • the full_screen_display_flag (service full screen display designation flag) indicated by reference number 901 is a flag that designates that the broadcast service (in an emergency) is displayed on the full screen.
  • An application_disable_flag (application end instruction flag) indicated by reference number 902 is a flag instructing the end of the data broadcasting application being executed (presenting) in an emergency.
  • the service_constraint_flag (service compulsory flag) indicated by reference number 903 is a flag that specifies whether to switch to the emergency broadcast service forcibly. If the flag is 0, any broadcast service is being received, and the emergency broadcast service is switched in an emergency. If the flag is 1, it is valid only when the following service ID is received.
  • the EWS_flag indicated by reference number 904 indicates the above-mentioned emergency broadcast service (specified by the service_constraint_flag) when the flag of the same name is set in the physical layer (that is, when an activation instruction is given even when the power is turned off).
  • a flag indicating an automatic tuning instruction indicates the above-mentioned emergency broadcast service (specified by the service_constraint_flag) when the flag of the same name is set in the physical layer (that is, when an activation instruction is given even when the power is turned off).
  • the service_constraint_flag and EWS_flag can realize an automatic (or compulsory) switching operation to the emergency notification service described above as the emergency notification requirement (3).
  • the region_filtering_flag (region filter flag) indicated by reference number 905 is a flag that specifies whether or not to perform region filtering for the emergency service descriptor.
  • region_filtering_flag is 1, the target area of the emergency service descriptor is designated by each parameter region_spec_type and target_region_spec in the IF statement indicated by reference numeral 907.
  • the region_spec_type and the target_region_spec have the same meaning as each parameter of the same name in the target area descriptor described later, and the description will be given later. With the region_filtering_flag, it is possible to realize the emergency notification operation limited to only the area targeted for the emergency notification described above as the emergency notification requirement (2).
  • network_id specifies a network including an emergency broadcast service
  • tlv_stream_id specifies a tlv stream including the emergency broadcast service
  • service_id specifies a service ID of the emergency broadcast service.
  • FIG. 10 shows a syntax example 1000 of the emergency caption display descriptor arranged in the descriptor area 801 or the emergency message descriptor area 802 in the emergency notification table (EAT).
  • the emergency caption display descriptor is a descriptor that specifies display parameters of captions to be displayed as emergency information.
  • the emergency caption display descriptor is arranged in the description area 801, it is applied to all captions specified in the emergency notification table. If an emergency caption display descriptor is arranged in the emergency message descriptor area 802, it is applied only to the corresponding emergency message.
  • Area_size_for_emergency_caption indicated by reference number 1001 designates a place and a size for displaying an emergency subtitle on the entire broadcast screen. On the receiver side, the broadcast screen is reduced, and an emergency subtitle display area having a size specified by area_size_for_emergency_caption is secured.
  • Font_size indicated by reference number 1002 specifies the font size of the emergency subtitles in terms of the number of pixels.
  • the font_type indicated by reference number 1003 specifies the font type of the emergency subtitle.
  • operation_mode indicated by reference number 1004 specifies an emergency subtitle display method (scroll display, ticker display, etc.).
  • Requirement (4) and (5) for emergency notification described above can be secured by the emergency caption display descriptor.
  • FIG. 11 shows a syntax example 1100 of the emergency information link descriptor arranged in the emergency message descriptor area 802 in the emergency notification table (EAT).
  • the emergency information link descriptor is a descriptor that specifies link information to detailed information about the corresponding emergency message.
  • Link_type indicated by reference number 1101 specifies the type of link information.
  • URI Uniform Resource Indicator
  • link information which is indicated by a link_type value 0x01.
  • Www_uri_length indicated by reference number 1102 indicates the byte length of uri as link information.
  • URI-type link information is described in units of bytes.
  • FIG. 12 shows a syntax example 1200 of the target area descriptor arranged in the emergency message descriptor area 802 in the emergency notification table (EAT).
  • the target area descriptor is a descriptor that specifies the target area of the corresponding emergency message, and is used for secondary filtering for determining whether or not to display the emergency message on the receiver side. With the target area descriptor, it is possible to realize the emergency notification operation limited to only the area subject to the emergency notification described above as the emergency notification requirement (2).
  • the region_spec_type indicated by the reference number 1201 designates the region description method in the subsequent target_region_spec () structure, and is encoded according to Table 1 below.
  • Target_region_spec indicated by reference number 1202 indicates a data structure for specifying a region specified for each region description method specification.
  • FIG. 13 shows a syntax 1300 of a region designator designated by a prefecture.
  • Prefecture_bitmap is a 55-bit bitmap indicating 1 and 0 whether or not the area corresponding to each bit position is a target (for an emergency message).
  • the emergency notification table (EAT) is transmitted as control information (MMT-SI) across services in the M2 section message as a container.
  • MMT-SI control information
  • FIG. 14 shows a screen display control example using the emergency service descriptor arranged in the emergency notification table.
  • FIG. 14A illustrates a display screen 1400 of the receiver before emergency notification.
  • the illustrated screen 1400 is divided into four parts, and in addition to the display screen 1401 of the broadcast service (TV program), as shown by reference numerals 1402 to 1404, applications app1, app2, and app3 other than the broadcast service are displayed. Even if the emergency notification by the broadcasting service is performed as it is on the screen in which various displays are mixed, there is a possibility that it is not noticeable.
  • FIG. 14B illustrates a screen 1410 in which the receiver transitions from the screen illustrated in FIG. 14A based on the information specified in the emergency notification table during the emergency notification period.
  • the broadcast station transmits an M2 section message storing the emergency notification table with a predetermined packet ID of the IP data flow dedicated to SI.
  • FIG. 15 shows another example of screen display control using the emergency service descriptor.
  • FIG. 15A illustrates a screen display of the receiver before the emergency notification.
  • the illustrated screen 1500 is divided into four parts, and in addition to the broadcast service display screen 1501, as shown by reference numerals 1502-1504, applications app1, app2, and app3 other than the broadcast service are displayed.
  • a data broadcast application encoded in the HTML5 format is activated, and a data broadcast (HTML5 App) is simultaneously presented in the broadcast service display screen 1501 together with the video of the TV program.
  • HTML5 App HTML5 App
  • FIG. 15B illustrates a screen 1510 in which the receiver transits from the screen illustrated in FIG. 15A based on the information specified in the emergency notification table during the emergency notification period.
  • the broadcast station transmits an M2 section message storing the emergency notification table with a predetermined packet ID of the IP data flow dedicated to SI.
  • the receiver can return to the previous state (the data at the time of termination) so that it can return to the screen display prior to the emergency notification after the emergency notification period ends. (Broadcast application state) is maintained.
  • FIG. 16 shows still another example of screen display control using the emergency service descriptor.
  • the same broadcaster provides a plurality of broadcast services, and one of these broadcast services is an emergency broadcast service (in an emergency notification period).
  • FIG. 16A illustrates a display screen 1600 of the receiver before emergency notification.
  • the illustrated screen 1600 displays a broadcast service (normal TV program) other than the emergency broadcast service.
  • FIG. 16B illustrates a screen 1610 in which the receiver transitions from the screen illustrated in FIG. 16A based on the information specified in the emergency notification table during the emergency notification period.
  • service_constraint_flag 0, that is, switching to the emergency broadcast service is specified in the emergency service descriptor in the emergency notification table.
  • the broadcast station When the broadcast station enters the emergency notification period, the broadcast station transmits an M2 section message storing the emergency notification table with a predetermined packet ID of the IP data flow dedicated to SI.
  • the receiver always monitors a predetermined packet ID of the IP data flow dedicated to SI, receives the emergency notification table, and is designated to switch to the emergency broadcast service by the emergency service descriptor.
  • a triplet network_id, tlv_stream_id, service_id) for identifying an emergency broadcast service is specified (described above).
  • FIG. 17 also shows a screen display control example using the emergency service descriptor. Also in the screen display control example shown in FIG. 17, it is assumed that the same broadcaster provides a plurality of broadcast services, and one of these broadcast services is an emergency broadcast service (in an emergency notification period).
  • FIG. 17A illustrates a display screen 1700 of the receiver before emergency notification. The illustrated screen 1700 is divided into four parts, and in addition to the display screen 1701 of the broadcast service (TV program), as shown by reference numbers 1702 to 1704, applications app1, app2, and app3 other than the broadcast service are displayed.
  • a broadcast service (TV program) display screen 1701 displays a broadcast service (normal TV program) other than the emergency broadcast service.
  • FIG. 17B illustrates a screen 1710 in which the receiver transits from the screen illustrated in FIG. 17A based on the information specified in the emergency notification table during the emergency notification period.
  • the broadcast station transmits an M2 section message storing the emergency notification table with a predetermined packet ID of the IP data flow dedicated to SI.
  • the receiver always monitors a predetermined packet ID of the IP data flow dedicated to SI, receives the emergency notification table, and is designated to switch to the emergency broadcast service by the emergency service descriptor.
  • service_constraint_flag 0
  • the reception is switched to the emergency broadcast service in which the triplet is specified in the emergency service descriptor.
  • full_screen_display_flag 1
  • region_filtering_flag region filter flag
  • target region can be specified by the parameters region_spec_type and target_region_spec in the emergency service descriptor (see FIG. 9 and FIG. 9).
  • FIG. 18 shows an example of regional filtering for emergency broadcast service display.
  • All the receivers in each region in Japan are displaying a multi-screen including a broadcast service (other than the emergency broadcast service) and application display as shown in FIG. 17A before the emergency notification. To do.
  • the emergency notification period starts and receivers throughout the country receive the same emergency notification table.
  • the emergency notification table an emergency service descriptor in which switching to the emergency broadcast service, full screen display of the broadcast service, and regional filtering are specified is arranged.
  • the receiver in the Kanto region can be switched to the full screen of the emergency broadcast service similar to that shown in FIG.
  • FIG. 19 illustrates a display switching scenario to the emergency broadcast service.
  • a broadcast signal (TLV stream) 1900 transmitted from a certain broadcaster (broadcast station) is illustrated, and the horizontal axis is the time axis.
  • the broadcaster provides two broadcast services.
  • broadcast services # 1 and # 2 are transmitted as indicated by reference numbers 1901 and 1902, respectively.
  • Each of the broadcast services # 1 and # 2 includes each asset (component) of video, audio, caption, and data broadcast, and control information (MMT-SI) for each broadcast service.
  • MMT-SI control information
  • the broadcaster may provide three or more broadcast services.
  • control information MMT-SI common to the broadcast services # 1 and # 2 (transverse service) is also transmitted.
  • the period t1 to t2 is an emergency notification period.
  • an M2 section message storing an emergency notification table (EAT) is transmitted with a predetermined packet ID of the service crossing MMT-SI.
  • EAT emergency notification table
  • the receiver that receives the broadcast signal (TLV stream) 1900 shown in FIG.
  • the receiver is assumed to be installed in the target area specified by the emergency_region_map of the emergency notification table 1904 and in the target area specified by the target_region_spec of the emergency service descriptor in the table.
  • the receiver Before entering the emergency notification period t1, the receiver receives the broadcast service # 2 and divides the screen to display the applications app1, app2, and app3 other than the broadcast service, as indicated by reference numeral 1905. Yes.
  • the receiver constantly monitors a predetermined packet ID of the cross-service MMT-SI indicated by reference numeral 1903, and can receive the emergency notification table 1904 when the emergency notification period t1 is entered.
  • the receiver holds the state indicated by reference numeral 1905 before entering the emergency notification period t1, and then performs an operation of switching to the emergency broadcast service according to the contents specified in the emergency notification table 1904.
  • broadcast service # 1 in which a triplet is specified in the emergency service descriptor.
  • the receiver switches the broadcast service # 1 to the full-screen display as indicated by reference numeral 1906.
  • the receiver holds the previous state (application execution state) when switching to full screen display.
  • the receiver when the receiver cannot receive the emergency notification table 1904 at time t2, it detects that the emergency notification period has ended. Then, as indicated by reference numeral 1907, the receiver resumes the state held before entering the emergency notification period t1.
  • the emergency notification table can include one or more emergency messages that specify the display of emergency subtitles (described above).
  • FIG. 20 shows an example of emergency subtitle screen display control using an emergency message.
  • FIG. 20A illustrates a display screen 2000 of the receiver before emergency notification.
  • the illustrated screen 2000 is a reception screen for a normal broadcast service.
  • FIG. 20B illustrates a screen 2010 on which the receiver displays emergency subtitles based on information specified in the emergency notification table during the emergency notification period.
  • information of one or more emergency messages can be arranged in the message loop in the emergency notification table.
  • display priority and urgent message for display that is, text information of urgent subtitles are designated.
  • an emergency caption display descriptor can be arranged for each emergency message.
  • the emergency subtitle display descriptor includes the location and size (area_size_for_emergency_caption), the font size (font_size), the font type (font_type), and the emergency subtitle display method (operation_mode). ) Is specified (see FIG. 10).
  • a target area descriptor (see FIG. 12) is arranged for each emergency message.
  • the receiver can perform secondary filtering for each emergency message based on the target area descriptor.
  • FIG. 21 shows an example of regional filtering for emergency subtitle display.
  • the emergency notification period starts and receivers throughout the country receive the same emergency notification table.
  • an emergency message “An earthquake has occurred! Tsunami warning is issued! Please evacuate immediately to the hill!” Is designated.
  • the receiver in the Kanto region has the same broadcast service screen as shown in FIG. 20B, and is switched to a screen including emergency subtitles.
  • the broadcaster provides one broadcast service, and broadcast service # 1 is transmitted in the illustrated TLV stream 2200, as indicated by reference numeral 2201.
  • This broadcast service # 1 includes each asset (component) of video, audio, subtitles, and data broadcast, and control information (MMT-SI) for each broadcast service.
  • the broadcaster may provide two or more broadcast services, but broadcast service # 1 is shown for the sake of simplicity of the drawing.
  • control information MMT-SI common to the broadcasting service (transverse service) is also transmitted.
  • Periods t11 to t12 are emergency notification periods.
  • an M2 section message storing an emergency notification table (EAT) is transmitted with a predetermined packet ID of the service crossing MMT-SI.
  • EAT emergency notification table
  • the display position and size, font size, font type, and display method of the emergency message “An earthquake has occurred! Tsunami warning issued! Please evacuate immediately to the hill!” Are specified. Yes.
  • the receiver that receives the broadcast signal (TLV stream) 2200 shown in FIG.
  • the receiver is assumed to be installed in the target area specified by the emergency_region_map of the emergency notification table 2203 and in the target area specified by the target_region_spec of the emergency service descriptor in the table.
  • the receiver Before the emergency notification period t11, the receiver receives the broadcast service # 1 and displays it on the full screen as indicated by reference numeral 2204.
  • the receiver constantly monitors a predetermined packet ID of the service crossing MMT-SI indicated by reference number 2202 and can receive the emergency notification table 2203 when the emergency notification period t11 is entered.
  • the receiver holds the state indicated by the reference number 2204 before entering the emergency notification period t11, and then performs the switching operation to the emergency broadcast service according to the contents specified in the emergency notification table 2203.
  • the screen of the normal broadcast service is reduced (scaled) in order to provide an emergency caption display area having a size designated by area_size_for_emergency_caption according to the designation of the emergency caption display descriptor.
  • this emergency subtitle has the highest display priority or only this emergency subtitle message.
  • the receiver since switching to the emergency broadcast service (service_constraint_flag) is not specified, the receiver continues to receive broadcast service # 1.
  • the receiver detects that the emergency notification period has ended. Then, as indicated by reference numeral 2206, the receiver resumes the state held before entering the emergency notification period t11.
  • FIG. 23 shows a configuration example of the broadcast transmission system 11 that transmits a broadcast service and control information (MMT-SI) and transmits an emergency notification table (EAT) as a control information table during an emergency notification period.
  • the broadcast transmission system 11 shown in the figure includes a clock unit 2301, a signal transmission unit 2302, a video encoder 2303, an audio encoder 2304, a subtitle / character super encoder 2305, a signaling encoder 2306, and a file encoder 2307.
  • EDPS Electronic Data Processing System
  • the clock unit 2301 generates time information synchronized with the time information acquired from the NTP server (not shown), and sends an IP packet including the time information to the IP service multiplexer 2310.
  • the signal transmission unit 2302 is, for example, a recording / playback device such as a studio of a TV broadcast station or a VTR. Are sent to the video encoder 2303, the audio encoder 2304, the subtitle / character super encoder 2305, and the file encoder 2307, respectively.
  • the electronic data processing system 2308 is a TV broadcasting station scheduler and a file supply source.
  • the electronic data processing system 2308 sends a data broadcast application that is non-timed media to the file encoder 2307. Also, the electronic data processing system 2308 sends control information indicating the configuration of the broadcast service to the signaling encoder 2306.
  • the electronic data processing system 308 also sends emergency information to the signaling encoder 2306 during the emergency notification period. Also, the electronic data processing system 2308 sends control information related to multiplexing of IP packets to the TLV signaling encoder 2309.
  • the broadcast transmission system 11 transmits a plurality of broadcast services
  • HEVC encoding of the video signal AAC encoding of the audio signal
  • subtitle / character super encoding processing are performed for each broadcast service. It is sent to the corresponding IP service multiplexer 2310.
  • the broadcast transmission system 11 is equipped with a plurality of IP service multiplexers 2310-1, ... 2310-N for each broadcast channel (broadcast service) to be transmitted.
  • the IP service multiplexer 2310 for each broadcast service channel receives IP packets including video, audio, subtitles, (broadcast service unit) MMT-SI, and data broadcast applications sent from the encoders 2303 to 2307. Multiplexed to generate a TLV packet including a broadcast signal for each broadcast service and MMT-SI across the broadcast service.
  • the modulation / transmission unit 2312 performs RF modulation processing on the TLV stream generated by the TLV multiplexer 2311 and transmits the result to the broadcast transmission path.
  • the clock unit 2301 generates time information synchronized with time information acquired from an NTP server (not shown), and generates an IP packet including this time information.
  • the video signal sent from the signal sending unit 2302 is supplied to the video encoder 2303.
  • the video signal is HEVC encoded and further packetized to generate an IP packet including an MMT packet of the HEVC encoded video signal. This IP packet is sent to the IP service multiplexer 2310.
  • an IP packet including the MMT packet of the AAC encoded audio signal generated by the audio encoder 2304 is sent to the IP service multiplexer 2310, and the subtitle encoded signal generated by the subtitle / character super encoder 2305 is transmitted.
  • An IP packet including the MMT packet is sent to the IP service multiplexer 2310.
  • the signaling encoder 2306 generates control information (MMT-SI) indicating the configuration of the broadcast program based on information sent from the electronic data processing system 2308, and the MMT-SI is arranged in the payload portion.
  • An IP packet including the MMT packet is generated.
  • the signaling encoder 2306 generates an IP packet including a cross-service M2 section message storing an emergency notification table (EAT) based on emergency information supplied from the electronic data processing system 2308. These IP packets are sent to the IP service multiplexer 2310.
  • EAT emergency notification table
  • the data broadcast application transmitted from the signal transmission unit 2302 or the electronic data processing system 2308 is supplied to the file encoder 2307.
  • the data broadcasting application is encoded in, for example, HTML5 format, further packetized, and an IP packet including the MMT packet is generated. This IP packet is sent to the IP service multiplexer 2310.
  • Each IP service multiplexer 2310 includes each of video, audio, captions, MMT-SI (broadcast service unit and service crossing), and data broadcasting application (HTML5 document) sent from each encoder 2303 to 2307.
  • the IP packet is multiplexed to generate a TLV packet that constitutes one channel.
  • the TLV signaling encoder 2309 Based on the information sent from the electronic data processing system 2308, the TLV signaling encoder 2309 generates a TLV packet in which the control information (TLV-SI) related to multiplexing of the IP packet is arranged in the payload portion.
  • TLV-SI control information
  • the TLV multiplexer 2311 multiplexes the TLV packets generated by the IP service multiplexers 2310-1 to 2310-N and the TLV signaling encoder 2309 to generate a TLV stream.
  • the modulation / transmission unit 2312 performs RF modulation processing on the TLV stream generated by the TLV multiplexer 2311 and sends the RF modulation signal to the broadcast transmission path.
  • FIG. 24 shows a configuration example of the receiver 12 that receives a broadcast signal from the broadcast transmission system 11.
  • the illustrated receiver 12 includes a tuner / demodulator 2401, an MMT demultiplexer (DEMUX) 2402, a clock recovery unit 2403, a video decoder 2404, an audio decoder 2405, a character super decoder 2406, a subtitle.
  • a scaler 2414, synthesis units 2415 to 2418, a scaler 2419, and a synthesis unit 2420 are provided.
  • the receiver 12 is configured to process an emergency notification table (EAT) transmitted as control information during the emergency notification period.
  • EAT emergency notification table
  • the tuner / demodulator 2401 selects and receives a broadcast signal, performs demodulation processing, and obtains a TLV stream.
  • the MMT demultiplexer 2402 performs demultiplex processing and depacketization processing on this TLV stream.
  • the demultiplexer 2402 includes a packet filter 2402-1 and an SI filter 2402-2.
  • the packet filter 2402-1 performs filtering of the IP packet based on the TLV stream identification information and the IP address, and further filters the MMTP packet from the IP packet based on the information in the MMTP header, so that the video, audio, subtitle , And an MMTP packet on which each encoding component of multimedia (data broadcasting application) and signaling information are placed are respectively converted into a video decoder 2404, an audio decoder 2405, a character super decoder 2406, a subtitle decoder 2407, and a multimedia (MM). ) Allocation to cache 2408 and SI filter 2402-2.
  • the SI filter 2402-2 filters the broadcasting service unit and the broadcasting service crossing signaling information SI and caches them in the SI cache 2409.
  • an M2 section message storing an emergency notification table (EAT) is sent from the broadcast transmission system 11 as MMT-SI across services. Accordingly, during the emergency notification period, the SI filter 2402-1 filters this M2 section message, and the emergency notification table (EAT) is cached in the SI cache 2409.
  • the clock recovery unit 2403 Based on the current time information included in the NTP packet filtered by the packet filter 2402-1 in the MMT demultiplexer 2402, the clock recovery unit 2403 generates time information synchronized with this time information, In order to decode the timed media, they are output to a video decoder 2404, an audio decoder 2405, a character super decoder 2406, and a caption decoder 2407, respectively.
  • the video decoder 2404 decodes the encoded video signal obtained by the MMT demultiplexer 2402 to obtain a baseband video signal.
  • the audio decoder 2405 decodes the encoded audio signal obtained by the MMT demultiplexer 2402 to obtain a baseband audio signal.
  • the character super decoder 2406 and the caption decoder 2407 respectively decode the character super and the caption encoded signal obtained by the MMT demultiplexer 2402 to obtain the character super and caption display signals, respectively.
  • the broadcast system control unit 2410 controls the broadcast service reception operation of the entire receiver 12 based on the MMT-SI cached in the SI cache 2409. For example, when the broadcast system control unit 2410 analyzes MMT-SI (MH-AIT) and finds a data broadcast application set in the default entry, the broadcast system control unit 2410 performs a data broadcast presentation process on the application engine 2411. Instruct.
  • the application engine 2411 is, for example, an HTML browser or the like, and processes a data broadcast application (HTML5 document or the like) cached in the multimedia cache 2408 to generate a data broadcast display signal and an audio signal.
  • the application engine 2411 obtains data files (media data used for data broadcasting display, linked application, etc.) necessary for data broadcasting display from the IP network via the communication interface 2412. You can also.
  • the emergency information display control unit 2413 displays an emergency broadcast service (see FIGS. 14 to 18) and emergency subtitle display based on the emergency notification table (EAT) cached in the SI cache 2409 during the emergency notification period.
  • the emergency information display process such as (see FIGS. 20 to 21) is controlled.
  • the scaler 2414 performs a scaling process on the video signal (broadcast video) decoded by the video decoder 2404 according to the screen size of the receiver 12.
  • the synthesizer 2415 synthesizes the audio signal decoded by the audio decoder 2405 and the audio signal for data broadcasting reproduced by the application engine 2411 to generate an audio signal for output.
  • the synthesizing unit 2416 synthesizes the character super display decoded by the character super decoder 2406 and the subtitle display decoded by the subtitle decoder 2407.
  • the combining unit 2417 combines the broadcast video scaled by the scaler 2414 and the display signal of the data broadcast generated by the application engine 2411. Further, the composition unit 2418 in the subsequent stage synthesizes the broadcast video on which the display of the data broadcast is superimposed, the character super display and the caption display output from the composition unit 2416.
  • the scaler 2419 displays an emergency broadcast service full screen display (see FIGS. 14 to 18) or emergency subtitle display (see FIGS. 14 to 18) for the broadcast video output from the synthesis unit 416. (See FIGS. 20 to 21).
  • the synthesizing unit 2420 synthesizes emergency subtitles output from the emergency information display control unit 2413 with the broadcast video scaled by the scaler 2419 to generate an output video signal.
  • the tuner / demodulator 2401 receives a broadcast signal, performs demodulation processing, and obtains a TLV stream.
  • the TLV stream is subjected to demultiplex processing and packetization processing, and NTP time information, video, audio, character super and subtitles, data broadcasting encoded signals, and Signaling information is extracted and distributed to a video decoder 2404, an audio decoder 2405, a character super decoder 2406, a caption decoder 2407, a multimedia (MM) cache 2408, and an SI filter 2402-1.
  • the NTP packet extracted by the demultiplexer 2402 is distributed to the clock recovery unit 2403.
  • the clock recovery unit 2403 generates time information synchronized with the time information based on the time information put on the NTP packet. That is, the clock recovery unit 2403 generates time information that matches the time information generated by the clock unit 2301 on the broadcast transmission system 11 side.
  • the encoded video signal extracted by the MMT demultiplexer 2402 is sent to the video decoder 2404 and decoded to obtain a baseband video signal.
  • the character super encoded signal extracted by the demultiplexer 2402 is sent to the character super decoder 2406 to be decoded to obtain a character super display signal.
  • the caption encoded signal extracted by the demultiplexer 2402 is sent to the caption decoder 2407 and decoded, so that a caption display signal is obtained.
  • the broadcasting system control unit 2410 controls the entire reception processing operation by the receiver 12 including the processing of the data broadcasting application based on the MMT-SI received via the SI filter 2402-2 and the SI cache 2409.
  • the application engine 2411 processes a data broadcasting application (HTML5 document or the like) cached in the multimedia cache 2408, and generates a data broadcasting display signal and an audio signal.
  • a data broadcasting application HTML5 document or the like
  • the emergency information display control unit 2413 performs an emergency notification table (EAT) process that is cached in the SI cache 2409 during the emergency notification period.
  • EAT emergency notification table
  • the scaler 2414 performs a scaling process on the video signal (broadcast video) decoded by the video decoder 2404. Further, the synthesis unit 2416 synthesizes the character super display decoded by the character super decoder 2406 and the subtitle display decoded by the subtitle decoder 2407. Subsequently, the synthesizing unit 2417 combines the broadcast video scaled by the scaler 2414 and the display signal of the data broadcast generated by the application engine 2411. Further, in the subsequent synthesis unit 2418, the broadcast video on which the display of the data broadcast is superimposed, the character super display and the caption display output from the synthesis unit 2416 are synthesized.
  • the scaler 2419 performs scaling processing for full screen display and emergency subtitle display of the emergency broadcast service on the broadcast video output from the synthesis unit 2416 in accordance with an instruction from the emergency information display control unit 2413.
  • the synthesizing unit 2420 synthesizes emergency subtitles output from the emergency information display control unit 2413 and the broadcast video scaled by the scaler 2419 to generate an output video signal.
  • the synthesis unit 2415 synthesizes the audio signal decoded by the audio decoder 2405 and the audio signal for data broadcasting reproduced by the application engine 2411 to generate an output audio signal.
  • the scaler 2414 performs a scaling process on the video signal (broadcast video) decoded by the video decoder 2404 in accordance with the screen size of the receiver 12.
  • the combining unit 2417 combines the broadcast video 2511 scaled by the scaler 2414 and the data broadcast display signal (graphics) 2512 generated by the application engine 2411 to generate a multimedia plane 2502.
  • the synthesis unit 2416 synthesizes the character super plane 2504 including the character super display decoded by the character super decoder 2406 and the subtitle plane 2503 including the subtitle display decoded by the subtitle decoder 2407.
  • the combining unit 2418 combines a plane obtained by combining the multimedia plane 2502 in which the data broadcast display is superimposed on the broadcast video with the character super plane 2504 and the subtitle plane 2503 output from the combining unit 2416 on the background plane 2501.
  • a broadcast screen is generated by superimposing them in order.
  • FIG. 26 illustrates a screen 2600 that displays emergency subtitles on the broadcast screen.
  • a gray area indicated by reference numeral 2601 corresponds to a broadcast screen generated according to the procedure shown in FIG.
  • the parameter area_size_for_emergency_caption specifies the display location and size of the emergency caption on the entire broadcast screen (described above).
  • the scaler 2419 degenerates the broadcast screen 2601 and secures an emergency caption display area 2602 of a specified size specified by area_size_for_emergency_caption.
  • the synthesis unit 2420 superimposes the emergency subtitle output from the emergency information display control unit 2413 on the emergency subtitle display area 2602.
  • FIG. 27 and 28 show an example of a procedure for processing the emergency notification table (EAT) in the receiver 12 shown in FIG. 24 in the form of a flowchart.
  • the emergency information display control unit 2413 starts this processing routine every time a new emergency notification table (EAT) is received (including the case where table_id is updated).
  • the emergency information display control unit 2413 refers to the emergency_region_map in the received emergency notification table and performs primary filtering as to whether or not the receiver 12 is the target area of the emergency notification table (step S2701).
  • step S2701 If the receiver 12 is not the target area of the emergency notification table (No in step S2701), the processing routine is terminated. On the other hand, when the receiver 12 is the target area of the emergency notification table (Yes in step S2701), the emergency information display control unit 2413 subsequently determines whether an emergency service descriptor is arranged in the emergency notification table. Is checked (step S2702).
  • the emergency information display control unit 2413 further performs a regional filtering flag (region_filtering_flag). ) Is checked (step S2703). If the region filtering flag is on (Yes in step S2703), it is determined whether the receiver 12 is the target region specified by the target_region_spec () structure in the emergency service descriptor. Filtering is performed (step S2704).
  • the emergency information display control unit 2413 When the receiver 12 is the target area of the emergency service descriptor (Yes in step S2704) and when the regional filtering flag is off (No in step S2703), the emergency information display control unit 2413 Then, the emergency service display process designated by the emergency service descriptor (steps S2705 to S2710) is performed.
  • the emergency service descriptor is not arranged in the emergency notification table (No in step S2702) or when the receiver 12 is not the target area of the emergency service descriptor (No in step S2704), the emergency service Skip the display process.
  • the emergency information display control unit 2413 instructs the scaler 2419 to display all of the broadcast services.
  • the screen display is instructed (step S2706).
  • the emergency information display control unit 2413 checks whether or not the application termination is instructed by the emergency service descriptor (step S2707).
  • the emergency information display control unit 2413 instructs the application engine 2411 to terminate the application. An instruction is given (step S2708).
  • the emergency information display control unit 2413 includes the emergency service descriptor in the emergency service descriptor.
  • the reception is switched to the emergency broadcast service for which the triplet is designated.
  • step S2711 When one or more emergency messages are specified in the emergency notification table (that is, number_of_message ⁇ 1) (Yes in step S2711), the emergency information display control unit 2413 displays each emergency message (emergency subtitle). The processing is performed in order. If an urgent message is not designated (No in step S2711), this processing routine is terminated.
  • step S2712 When the target area is specified by the target area descriptor for the urgent message (Yes in step S2712), secondary filtering is performed to determine whether or not the receiver 12 is the target area of the urgent message (step S2713). ).
  • the emergency information display control unit 2413 Implements the emergency message display process.
  • the emergency message display process steps S2714 to S2716 is skipped.
  • the emergency information display control unit 2413 scales (degenerates) the broadcast service screen to the scaler 2419 in order to create an emergency caption display area having the position and size specified by the parameter area_size_for_emergency_caption of the emergency caption display descriptor. ) The process is instructed (step S2714).
  • the emergency information display control unit 2413 generates an emergency caption with the font size and font type specified in the emergency caption display descriptor (step S2715). Then, the emergency information display control unit 2413 sends a scaled broadcast service screen to the synthesis unit 2420 so that the display method (scroll display, ticker display, etc.) specified by the emergency caption display descriptor is displayed. An emergency subtitle composition process is instructed (step S2716).
  • step S2717 If there is an unprocessed emergency message (No in step S2717), the process returns to step S2712, and the same process is performed for the next emergency message. When all the emergency messages have been processed (Yes in step S2717), the processing routine ends.
  • a second embodiment for transmitting emergency information as control information MMT-SI related to a broadcast service will be described.
  • the requirements (7) and (8) regarding full screen display are realized. Intended.
  • the second embodiment responds to the desire to display the broadcast screen in full screen in order to attract viewers' attention and perform easy-to-view display even in an emergency.
  • the timing for switching to full screen display is not necessarily the same in all TV receivers.
  • the timing for switching to full screen display may be determined according to the application operation for each receiver.
  • display control information for instructing or suggesting full-screen video and application display is added to a control signal for performing basic reception control for each broadcast service, such as an MP table, and transmitted.
  • a control signal for performing basic reception control for each broadcast service such as an MP table
  • the following items (31) to (34) can be listed as display control information added to the MP table.
  • the MP table is transmitted in units of broadcast services using a PA message as a container.
  • the PA message is an entry point of the broadcast service, and fixed packet identification information (for example, 0x0000) is assigned to the MMTP packet that transmits the PA message. Therefore, on the receiver side, the PA message can be acquired by filtering with the fixed packet identification information on the MMT transmission path (IP data flow for each broadcast service).
  • the MP table includes control information for performing basic reception control for each broadcast service. As shown in FIG. 4, each asset (video, audio, subtitle, data broadcast application, etc.) constituting the broadcast service is provided. ) Is specified.
  • FIG. 29 shows a syntax example 2900 of the MP table.
  • each parameter of the MP table will be described.
  • Table_id is an 8-bit fixed value (0x20) for identifying that the table is an MP table.
  • version is an 8-bit integer value indicating the version number of the MP table. For example, when some parameters (descriptors) constituting the MP table are also updated, version is incremented by +1.
  • the length is a 32-bit parameter indicating the size of the MP table in bytes, which is counted immediately after this field.
  • MPT_mode indicates an operation when this MP table is divided into subsets.
  • MMT_package_id_length indicates the size of the text information of the package identification information (MMT_package_id) in bytes.
  • MMT_package_id indicates package identification information in bytes (MMT_package_id_byte).
  • the package identification information is identification information as an entire package including assets such as all signals (video, audio, subtitles) and file data transmitted as broadcast signals (IP data flow). This identification information is text information, and the upper 16 bits have the same value as the service identification information for identifying the service.
  • MPT_descriptor_length indicates the size of the MP table descriptor area in bytes.
  • the contents of the MP table descriptor are described in units of bytes (MPT_descriptors_bytes).
  • MPT_descriptors_bytes In the MPT descriptor, basic information related to reception control of the entire corresponding broadcast service (package) is described.
  • a display priority designation descriptor is arranged as one of the MP table descriptors.
  • the display priority designation descriptor describes the above information (31) to (34) that instructs or suggests full screen display of video and application display in the broadcasting service. Details of the display priority designation descriptor will be described later.
  • Number_of_assets is an 8-bit parameter indicating the number of assets (signals, files) as elements constituting a broadcast service (package).
  • asset information loops There are as many asset information loops as number_of_assets.
  • asset identification information assert_id
  • MMT_general_location_info general location information
  • asset descriptor asset descriptor
  • Identifier_type indicates the ID system of the MMTP packet flow. If the ID system indicates asset identification information (asset_id), 0x00 is set.
  • asset_id_scheme indicates the format of asset identification information.
  • asset_id_length indicates the size of the text information of the asset identification information in bytes. In the subsequent asset identification information loop, the asset identification information is indicated in units of bytes (asset_id_byte).
  • Asset_type indicates the type of asset (video, audio, text super / caption, application, etc.) as a 32-bit character string.
  • asset_clock_relation_flag is a flag indicating the presence or absence of an asset clock information field. When the flag is 1, there are a clock information identification field (asset_clock_relation_id) and a time scale flag field (asset_timescale_flag). When the flag is 0, these fields do not exist.
  • location_count indicates the number of location information of the asset, and in a loop of location information repeated for the number of subsequent location_counts, MMT_general_location_info which is the location information of the corresponding asset is indicated.
  • the asset location information is described in the form of packet identification information (packet_id: PID) on the MMT transmission path from which the asset is acquired. Therefore, the asset identification information can be pulled on the MP table to extract the corresponding packet identification information on the MMT transmission path (IP data flow) (see FIG. 4).
  • Asset_descriptor_length indicates the size of the text information of the asset descriptor (asset_descriptor) in bytes. In the asset descriptor loop that follows, the contents of the descriptor for each asset are indicated in units of bytes (asset_descriptors_byte).
  • an “MPU timestamp descriptor” that provides the presentation time of the MPU
  • an “MPU extended timestamp descriptor” that provides the decoding time of the access unit in the MPU, etc.
  • FIG. 30 shows a syntax example 3000 of a display priority designation descriptor arranged as one of MPT descriptors related to the entire broadcasting service in the MP table. The meaning of each parameter of the display priority specification descriptor will be described below.
  • Descriptor_tag indicates a 16-bit fixed value for identifying that the descriptor is an event message descriptor.
  • Descriptor_length is an 8-bit field indicating the byte length from immediately after this field to the end of the descriptor.
  • a 2-bit display_control indicated by reference number 3001 specifies screen display control information applied to the broadcast service according to Table 2 below.
  • the application_disable_flagflag (application end instruction flag) indicated by reference number 3002 is a flag that instructs the end of the data broadcasting application being executed (presenting).
  • the region_filtering_flag (region filter flag) indicated by reference number 3003 is a flag that specifies whether or not to perform region filtering for the display priority designation descriptor.
  • region_filtering_flag is 1
  • the target area of the emergency service descriptor is specified by each parameter region_spec_type and target_region_spec in the IF statement indicated by reference number 3004.
  • the region_spec_type and the target_region_spec have the same meaning as each parameter of the same name in the target region descriptor (see FIG. 12) described above, and the description thereof is omitted here.
  • the display priority designation descriptor for instructing or suggesting the full screen display of the video and application is arranged in the MP table, and the PA message for each broadcast service is transmitted as a container.
  • screen display control using a display priority designation descriptor (see FIG. 30) arranged in the MP table in the receiver will be described.
  • FIG. 31 shows an example of screen display control using a display priority designation descriptor.
  • FIG. 31A illustrates a display screen 3100 of the receiver when receiving an MP table in which no display priority designation descriptor is arranged.
  • the illustrated screen 3100 is divided into four parts, and in addition to the broadcast service (TV program) display screen 3101, as shown by reference numerals 3102 to 3104, applications app 1, app 2, and app 3 other than the broadcast service are displayed.
  • the video of the broadcast service is not conspicuous.
  • FIG. 31 (B) the receiver starts from the screen shown in FIG. 31 (A) based on the information designated by the display priority designation descriptor arranged in the MP table of the broadcast service being received.
  • a transition screen 3110 is illustrated.
  • display_control is “10” or “11” in the display priority designation descriptor, that is, full-screen video is designated.
  • the broadcast station inserts a display priority designation descriptor in which display_control is set to “10” or “11” into the MP table and transmits the PA message during the broadcast period of the emergency broadcast service.
  • the receiver detects that the full display of the broadcast service is designated by the display priority designation descriptor of the MP table (display_control is “10” or “11”). As shown in FIG. 31B, the broadcast service is switched to full screen display.
  • FIG. 32 shows another example of screen display control using the display priority designation descriptor.
  • FIG. 32A illustrates a display screen 3200 of the receiver when receiving an MP table in which no display priority designation descriptor is arranged.
  • the illustrated screen 3200 is divided into four parts, and in addition to the broadcast service display screen 3201, as shown by reference numerals 3202 to 3204, applications app1, app2, and app3 other than the broadcast service are displayed.
  • a data broadcast application encoded in the HTML5 format is activated, and a data broadcast (HTML5 App) is simultaneously presented in the broadcast service display screen 3201 together with the video of the TV program.
  • HTML5 App HTML5 App
  • FIG. 32B illustrates a screen 3210 in which the receiver transits from the screen illustrated in FIG. 32A based on the information specified in the emergency notification table during the emergency notification period.
  • the receiver can return to the previous state (the data at the time of termination) so that it can return to the screen display prior to the emergency notification after the emergency notification period ends. (Broadcast application state) is maintained.
  • region_filtering_flag region filter flag
  • the target region can be specified by the parameters region_spec_type and target_region_spec in the display priority specification descriptor (see FIG. 30 and FIG. 30).
  • FIG. 33 shows an example of regional filtering of the broadcast service full screen display.
  • a PA message storing the same MP table is received while the emergency broadcast service is being broadcast.
  • a display priority designation descriptor in which full-screen display control of broadcast service and regional filtering are designated is inserted.
  • the receiver in the Kanto region can be switched unconditionally or conditionally to the full screen of the broadcasting service similar to that shown in FIG.
  • “11” indicates unconditional broadcast service full screen
  • “10” indicates conditional broadcast service full screen.
  • “Conditional” here means switching to full screen display after obtaining the consent of the viewer.
  • the viewer's consent is preferably a simple operation such as one touch.
  • FIG. 34 illustrates an unconditional broadcast service full screen scenario.
  • a broadcast signal (TLV stream) 3400 transmitted from a certain broadcaster (broadcast station) is illustrated, and the horizontal axis is a time axis.
  • the TLV stream 3400 includes a signal of one broadcasting service provided by the broadcasting office.
  • a broadcaster provides two or more broadcast services, but only one broadcast service is illustrated here for the sake of simplicity.
  • the broadcast service includes each asset (component) of video, audio, caption, and data broadcast, and control information (MMT-SI) for each broadcast service.
  • MMT-SI control information
  • the PA message 3401 which is a container of the MP table is transmitted as MMT-ST.
  • a PA message storing an MP table in which no display priority designation descriptor is arranged is transmitted.
  • a PA message storing an MP table in which display priority designation descriptors are arranged is transmitted.
  • display_control 11, that is, unconditional broadcasting service full screen is instructed.
  • the PA message storing the MP table in which the display priority designation descriptor is not placed is transmitted again.
  • the receiver Since the receiver receives the PA message storing the MP table 3411 in which the display priority designation descriptor is not arranged in the period before time t21, as shown by reference numeral 3402, the receiver receives the broadcast service,
  • the screen is divided to display applications app1, app2, and app3 other than the broadcast service.
  • the receiver broadcasts at the time t21. Resume the state that was held before switching to full screen display of the service.
  • FIG. 35 shows an example of a full screen scenario for a broadcast service under certain conditions.
  • a broadcast signal (TLV stream) 3500 transmitted from a certain broadcaster (broadcast station) is illustrated, and the horizontal axis is a time axis.
  • the TLV stream 3500 includes a signal of one broadcasting service provided by the broadcasting office.
  • a broadcaster provides two or more broadcast services, but only one broadcast service is illustrated here for the sake of simplicity.
  • the broadcast service includes each asset (component) of video, audio, caption, and data broadcast, and control information (MMT-SI) for each broadcast service.
  • MMT-SI control information
  • the PA message 3501 which is a container of the MP table is transmitted as MMT-ST.
  • a PA message storing an MP table in which no display priority designation descriptor is arranged is transmitted.
  • a PA message storing an MP table in which display priority designation descriptors are arranged is transmitted.
  • display_control 10 that is, a broadcast service full screen is instructed conditionally.
  • the PA message storing the MP table in which the display priority designation descriptor is not arranged is transmitted again.
  • the receiver Since the receiver receives the PA message storing the MP table 3511 in which the display priority designation descriptor is not arranged in the period before time t31, as shown by the reference number 3502, the receiver receives the broadcast service,
  • the screen is divided to display applications app1, app2, and app3 other than the broadcast service.
  • the receiver broadcasts at the time t21. Resume the state that was held before switching to full screen display of the service.
  • the broadcast transmission system 11 that transmits the MP table in which the display priority designation descriptor is arranged as the control information table may have the same configuration as that shown in FIG.
  • 12 for receiving the MP table in which the display priority designation descriptor is arranged may have the same configuration as that shown in FIG.
  • the emergency information display control unit 2413 activates this processing routine every time the MP table in which the display priority designation descriptor is arranged is received.
  • the emergency information display control unit 2413 first checks whether or not the region filtering flag (region_filtering_flag) is turned on in the display priority designation descriptor (step S3601).
  • the emergency information display control unit 2413 specifies that the receiver 12 is specified by the target_region_spec () structure in the display priority specification descriptor. It is checked whether or not it is the target area (step S3602). If the receiver 12 is not the target area for the display priority designation descriptor (No in step S3602), the processing routine is terminated.
  • the emergency information The display control unit 2413 performs subsequent broadcast service full-screen display processing.
  • the emergency information display control unit 2413 checks whether or not display_control is “10” or “11” in the display priority designation descriptor, that is, whether or not full-screen video is designated unconditionally or conditionally (step S21). S3603).
  • step S3603 If full-screen video is specified (Yes in step S3603), the display_control value is “10” or “11”, that is, whether the video is conditional or unconditional. Is further checked whether it is instructed to display the full screen (step S3604).
  • the emergency information display control unit 2413 gives the viewer of the receiver 12 a simple operation such as one touch. Ask for consent.
  • the emergency information display control unit 2413 displays the scaler 2419. Is instructed to display the full screen of the broadcast service (step S3606).
  • the embodiment in which the technology disclosed in this specification is applied to a broadcasting system adopting the MMT method for media transmission has been mainly described.
  • the gist of the technology disclosed in this specification is limited to this. It is not something.
  • the technology disclosed in this specification can be applied to various types of broadcast systems that transmit control information related to broadcast services together with broadcast signals such as video, audio, subtitles, and data broadcasts. Control of broadcast full-screen display and emergency subtitle display can be realized.
  • a transmission apparatus comprising: (2) The transmission unit transmits a plurality of broadcast services, The control information transmission unit transmits the emergency information as control information common to the plurality of broadcast services.
  • the control information transmission unit transmits the control information including the emergency information in an emergency notification period.
  • the transmission device according to any one of (1) and (2) above.
  • the control information transmission unit includes information related to the target area in the emergency information and transmits the information.
  • the control information transmission unit transmits emergency service information related to display control of an emergency broadcast service included in the emergency information.
  • the transmission device according to any one of (1) to (3) above.
  • the control information transmission unit includes information for instructing full-screen display of a broadcast service in the emergency service information, and transmits the information.
  • the transmission device according to (5) above.
  • the control information transmission unit includes information for instructing termination of the application included in the emergency service information, and transmits the information.
  • the control information transmission unit includes information specifying whether to forcibly switch to an emergency broadcast service in the emergency service information, and transmits the information.
  • the transmitter according to any one of (5) to (7) above.
  • the control information transmission unit includes information for identifying the emergency broadcast service included in the emergency service information and transmits the information.
  • the control information transmission unit includes information indicating an automatic channel selection instruction for an emergency broadcast service in the emergency service information when there is an activation instruction even when the power is turned off.
  • the control information transmission unit includes information related to a target area in the emergency service information and transmits the information.
  • (12) The control information transmission unit transmits information related to display control (display area and size, font size, font type, display method) of the emergency subtitles included in the emergency information.
  • the control information transmission unit transmits information related to an emergency message included in the emergency information.
  • the transmission device according to any one of (5) to (12) above.
  • the control information transmission unit transmits information indicating display priority included in the emergency message.
  • the transmission device according to (13) above.
  • the control information transmission unit includes information related to the target area in the emergency message and transmits the information.
  • the transmission device according to (13) above.
  • the control information transmission unit transmits information related to display control of the emergency message (display area and size, font size, font type, display method) included in the emergency message, The transmission device according to any one of (13) to (15) above.
  • the control information transmission unit transmits link information to detailed information included in the emergency message.
  • the transmission device according to any one of (13) to (16).
  • the receiving device according to (19) above.
  • (21) In response to the emergency service information instructing the full screen display of the broadcast service, the control unit displays the full screen of the broadcast service received by the receiving unit.
  • the receiving device according to any one of (19) to (20).
  • the control unit In response to the emergency service information instructing termination of the application, the control unit terminates execution of the data broadcast application received by the receiving unit.
  • the receiving device according to any one of (19) to (21).
  • the control unit In response to the emergency service information instructing forced switching to the emergency broadcast service, the control unit switches to display of the emergency broadcast service.
  • the receiving device according to any one of (19) to (23).
  • the control unit switches to display of an emergency broadcast service in which identification information is specified by the emergency service information.
  • the control unit controls the display of the emergency broadcast service only when the target area is specified by the emergency service information.
  • the receiving device according to any one of (19) to (24).
  • the control unit controls display of emergency subtitles based on information related to an emergency message included in the emergency information received by the control information receiving unit.
  • the receiving device according to any one of (19) to (25).
  • the control unit controls the display of the emergency subtitles only when the target area is specified by the emergency message.
  • the control unit controls the screen display of the broadcast service based on the emergency information after holding the previous state in response to the control information receiving unit receiving the emergency information, and the emergency information When the information is no longer received, the stored state is resumed.
  • the receiving device according to any one of (19) to (27).
  • (29) a receiving step of receiving assets constituting a broadcast service; A control information receiving step for receiving control information related to a broadcast service including emergency information; A control step for controlling the screen display of the broadcast service based on the control information; Receiving method.
  • a transmission apparatus comprising: (31) The transmission unit transmits video and application assets related to a broadcast service, The control information transmission unit transmits the display priority designation information that suggests full screen display of the video and application.
  • the display priority designation that instructs the control information related to reception control of the assets constituting the broadcast service to display on the full screen either unconditionally or conditionally for display of the video and application.
  • Send information The transmission device according to any one of (30) and (31) above.
  • the control information transmission unit includes information for instructing termination of the application and transmits the information in the display priority designation information.
  • the control information transmission unit includes information related to the target area in the display priority designation information and transmits the information.
  • the transmission device according to any one of (30) to (33) above. (35) a transmission step of transmitting assets constituting the broadcast service; A control information transmission step for transmitting display priority designation information in control information related to a broadcast service; A transmission method.
  • a receiving unit that receives assets constituting a broadcast service;
  • a control information receiving unit for receiving control information related to a broadcast service including display priority designation information;
  • a control unit that controls screen display of the broadcast service based on the display priority designation information;
  • a receiving apparatus comprising: (37) The reception unit receives video and application assets related to a broadcast service, The control unit controls full screen display of the video and application based on the display priority designation information received by the control information receiving unit.
  • the receiving device according to (36) above.
  • the control unit In response to the display priority designation information instructing termination of the application, the control unit terminates execution of the data broadcast application received by the receiving unit.
  • the receiving device according to any of (36) or (37) above.
  • the control unit controls the full-screen broadcasting service only when the target area is designated by the display priority designation information.
  • the receiving device according to any one of (36) to (38).
  • the control information receiving unit receives the display priority designation information instructing full screen display either unconditionally or conditionally for display of the video and application, When the control unit receives the display priority designation information instructing conditional full screen display, the control unit controls full display of the broadcast service according to the user's consent operation of the receiving device.
  • the receiving device according to any one of (36) to (39). (41) a receiving step of receiving assets constituting a broadcast service; A control information receiving step for receiving control information related to a broadcast service including display priority designation information; A control step of controlling screen display of the broadcast service based on the display priority designation information; Receiving method.
  • DESCRIPTION OF SYMBOLS 10 ... Digital broadcasting system 11 ... Broadcast transmission system, 12 ... Receiver 2301 ... Clock part 2302 ... Signal transmission part 2303 ... Video encoder 2304 ... Audio encoder 2305 ... Subtitle / text super encoder 2306 ... Signaling encoder 2307 ... File encoder 2308 ... Electronic data processing system 2309 ... TLV signaling encoder 2310 ... IP service multiplexer 2311 ... TLV multiplexer, 2312 ... Modulation / transmission unit 2401 ... Tuner demodulation unit 2402 ... MMT demultiplexer 2403 ... Clock recovery unit 2404 ... Video decoder 2405 ... Audio decoder 2406 ... Character super decoder 2407 ...
  • Subtitle decoder 2408 Multimedia cache 2409 ... SI cache, 2410 ... broadcasting system control unit 2411 ... application engine 2412 ... communication interface 2413 ... emergency information display control unit, 2414 ... scaler 2415-2418 ... synthesis unit, 2419 ... scaler 2420 ... synthesis unit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un dispositif et un procédé d'émission qui permettent une émission d'informations d'urgence en tant qu'informations de commande relatives à un service de diffusion. Le diffuseur émet des informations d'urgence sous forme de table d'informations de commande appelée EAT, pendant une période d'annonce d'urgence. Les informations comprises dans l'EAT, en tant qu'informations de commande de service de diffusion correspondant à une situation d'urgence, consistent en : des informations d'identification de service de diffusion ; des informations ordonnant un affichage de diffusion en plein écran ; des informations d'instruction de sélection de canal automatique du service de diffusion d'urgence ; des informations d'instruction de sélection de canal automatique du service de diffusion d'urgence dans l'éventualité d'une instruction de démarrage hors tension ; des informations de filtrage de zone indiquant une zone cible ; et des informations de commande d'affichage d'intitulés d'urgence.
PCT/JP2016/061068 2015-05-18 2016-04-05 Dispositif d'émission, procédé d'émission, dispositif de réception et procédé de réception WO2016185814A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015100645 2015-05-18
JP2015-100645 2015-05-18

Publications (1)

Publication Number Publication Date
WO2016185814A1 true WO2016185814A1 (fr) 2016-11-24

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Application Number Title Priority Date Filing Date
PCT/JP2016/061068 WO2016185814A1 (fr) 2015-05-18 2016-04-05 Dispositif d'émission, procédé d'émission, dispositif de réception et procédé de réception

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230291957A1 (en) * 2020-08-12 2023-09-14 Arris Enterprises Llc Device and method for displaying video

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009038629A (ja) * 2007-08-02 2009-02-19 Hitachi Ltd 移動体放送受信端末
JP2010045830A (ja) * 2006-02-07 2010-02-25 Toshiba Corp デジタル放送システムとこのシステムに用いられる放送装置及び受信機
JP2014064308A (ja) * 2011-05-19 2014-04-10 Nippon Hoso Kyokai <Nhk> 受信機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010045830A (ja) * 2006-02-07 2010-02-25 Toshiba Corp デジタル放送システムとこのシステムに用いられる放送装置及び受信機
JP2009038629A (ja) * 2007-08-02 2009-02-19 Hitachi Ltd 移動体放送受信端末
JP2014064308A (ja) * 2011-05-19 2014-04-10 Nippon Hoso Kyokai <Nhk> 受信機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230291957A1 (en) * 2020-08-12 2023-09-14 Arris Enterprises Llc Device and method for displaying video

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