JP5234801B2 - Digital broadcast recording apparatus and method - Google Patents

Description

  The present invention relates to a digital broadcast recording apparatus and method suitable for use in batch recording of multi-organized broadcasts in terrestrial digital broadcasts, for example.

  Currently, terrestrial digital broadcasting is mainly simultaneous broadcasting of analog terrestrial broadcasting, so multi-organized broadcasting is hardly performed except for some educational broadcasting. Multi-organized broadcasting is broadcasting that simultaneously transmits a plurality of programs of standard-definition video on one channel. However, multi-organization broadcasting is expected to increase toward the complete transition to terrestrial digital broadcasting in 2011. Therefore, it is considered that there will be a demand for a recording apparatus and a recording method corresponding to multi-organized broadcasting.

  For example, Patent Literature 1 and Patent Literature 2 are disclosed as technologies that provide the background of the present invention.

JP 2007-281993 A JP 2002-344825 A

  Conventional recorders compatible with digital terrestrial broadcasting can only record one program even in multi-organized broadcasting. In some cases, a plurality of tuners are installed to record a plurality of programs at the same time. However, this method requires additional installation of tuner hardware and is costly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a digital broadcast recording apparatus and method capable of recording multi-organized broadcasts in a lump without additionally installing tuner hardware. .

  In order to solve the above problems, the present invention provides a tuner unit that receives a digital broadcast and outputs a transport stream, and collects information related to a service included in the tuner stream that is output from the tuner unit and performs main reception control. A stream control unit that outputs to the unit, descrambles the transport stream using information input from the main reception control unit, distributes and outputs the transport stream for each service, and the stream control unit A plurality of secondary reception control units for the number of services based on the information related to the service collected by the primary reception control unit that outputs information based on a control result by the secondary reception control unit to the stream control unit; A plurality of sub-reception control units each performing reception control of each service, and the stream control unit The storage unit that encrypts and stores the transport stream for each service that has been input is separated from the transport stream corresponding to any one of the services output from the stream control unit or the storage unit. A DEMUX unit, a video decoder unit for decoding the video stream output from the DEMUX unit, and an audio decoder unit for decoding the audio stream output from the DEMUX unit are provided.

  According to the present invention, it is possible to record all programs that are multi-organized into one broadcast wave and broadcast without preparing a plurality of tuners. The reason for this is that in multi-organization broadcasting in terrestrial digital broadcasting, a plurality of services are multiplexed and transmitted in one transport stream, and can be received at one time by each tuner. Because the reception control of services is performed at the same time and distributed to the transport streams for each service by the stream control unit, it is possible to obtain transport streams for all services that are multi-organized without preparing multiple tuners. is there.

It is a block diagram for demonstrating the structural example of the digital broadcast receiver as one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. The present embodiment is configured as a digital broadcast receiving apparatus 1 equipped with one tuner, and has a function of simultaneously recording all multi-organized programs.

  The digital broadcast receiver 1 according to the embodiment of the present invention shown in FIG. 1 includes a tuner unit 101, a stream control unit 201, a reception control unit (main) 301, reception control units (sub) 311 to 31n, and a storage unit. 401, a DEMUX unit (= demultiplexing unit) 501, a video decoder unit 511, and an audio decoder unit 512. Each of these units may be configured as hardware alone, configured as a combination of a computer and hardware controlled or connected by the computer, or configured as a program executed by the computer.

  In the above configuration, the tuner unit 101 receives a terrestrial digital broadcast using an antenna or the like and outputs a transport stream TS. Note that some TS packets constituting the transport stream TS output from the tuner unit 101 are scrambled.

  The stream control unit 201 includes a descrambling unit 211 and a stream distribution unit 212. The scrambled TS packet included in the transport stream TS output from the tuner unit 101 is descrambled by the descrambling unit 211 using the descrambling key supplied from the reception control unit (main) 301. Is done. A transport stream TS (descrambled) composed of TS packets descrambled by the descrambling unit 211 or TS packets that have not been scrambled is input to the stream distribution unit 212. The stream distribution unit 212 collects PSI / SI information from the input transport stream TS (descrambled) and supplies it to the reception control unit (main) 301. The stream distribution unit 212 also distributes the transport stream TS (descrambled) for each service based on information input from the reception control unit (main) 301, and TS packets corresponding to each service for each service. Transport streams TS1 to TSn (for each service) consisting of columns are output.

  The specifications of each signal and information used in the present embodiment are standard based on ISO / IEC13818-1, the Japan Radio Industry Association standard ARIB STD-B10 “program arrangement information used for digital broadcasting” and the like. It shall have specifications. That is, the transport stream (TS) is composed of a plurality of fixed-length TS packets (transport stream packets) obtained by packetizing PES or section data. The header of each TS packet includes a PID (Packet Identifier) that is information for identifying the type of video, audio, data, etc. transmitted by the TS packet. PES is an abbreviation for Packetized Elementary Stream and means packetized video and audio encoded data. The section data is composed of management information such as information relating to services such as PSI (Program Specific Information) / SI (Service Information; program arrangement information), data representing the contents of data broadcasting, and the like. SI is data describing a distribution system, contents, schedule / timing, etc. of a broadcast data stream, and includes PSI. PSI is data composed of four types of tables (PAT, CAT, PMT, NIT).

  PAT is an abbreviation for Program Association Table, and specifies the PID of a TS packet that transmits a PMT related to a broadcast program. CAT is an abbreviation for Conditional Access Table, and specifies the PID of a TS packet that transmits individual information among related information of pay broadcasting. PMT is an abbreviation for Program Map Table, and specifies the PID of a TS packet that transmits each encoded signal that constitutes a broadcast program and the PID of a TS packet that transmits common information among related information of pay broadcasting. NIT is an abbreviation for Network Information Table, and transmits information associating transmission channel information such as a modulation frequency with a broadcast program.

  Another table classified as SI includes, for example, EIT. EIT is an abbreviation for Event Information Table, and is used to instruct information related to a program, such as a program name, broadcast date and time, and description of contents. Further, as a table other than SI (program arrangement information) transmitted as a section, there is an ECM, for example. ECM is an abbreviation for Entity Control Message, and transmits common information consisting of program information (program related information and descrambling key, etc.) and control information (decoder descrambling function forced on / off command). Used for.

  In the description of the present embodiment, the program means a collection of video and audio data that are in synchronization with each other, and corresponds to, for example, one program in television broadcasting. In multi-organization broadcasting, a plurality of programs (programs) are multiplexed on one transport stream (TS) to be broadcast. In this case, there is no need for a synchronization relationship between the programs. Further, the term service used in SI (program sequence information) or the like means a TV broadcast program.

  Based on the PSI / SI information collected by the stream control unit 201, the reception control unit 301 (main) analyzes the multi-organization state (that is, presence / absence of multi-organization) and information on each service (that is, the arrangement state of each service, etc.). To do. The reception control unit 301 (main) activates the reception control units 311 to 31n (sub) for the number of services according to the analysis result when multi-organization broadcasting is performed, and analyzes each service information for each service. By supplying the reception control units 311 to 31n (sub), the reception control of each service is performed for each service in the reception control units 311 to 31n (sub). That is, for example, the reception control unit 311 performs reception control corresponding to the first program of multi-organization broadcasting, and the reception control unit 312 performs reception control corresponding to the second program of multi-organization broadcasting. The reception control unit 301 (main) is also connected to a digital broadcast reception IC (Integrated Circuit) card 601 that is set in accordance with the reception control results by the reception control units 311 to 31n (sub) and is detachably mounted. Transmitting and receiving information between the terminals The stream control unit 201 is supplied with information such as the key used for the descrambling process acquired and the PID of the TS packet used when distributing the transport stream for each service.

  The plurality of reception control units 311 to 31n (sub) perform reception control of each service. Each reception control unit 311 to 31n (sub) is configured as a processing unit that can be executed in parallel by each computer as reception control, for example, and based on PSI / SI information regarding each service, the transport of each service TS packet PID required for processing such as stream generation and ECM PID required for descrambling each video / audio stream (that is, required for descrambling video / audio stream of each service) A list of transport stream packet packet identifiers including information representing the key to be generated is set on the reception control unit 301 (main) side. In this embodiment, it is assumed that the reception control units 311 to 31n (sub) are activated as threads that are one of processing units that can be executed in parallel by a computer.

  The storage unit 401 includes a local encryption unit 411, a local encryption / decryption unit 412, and a storage device 413 including an HDD (hard disk drive). The local encryption unit 411 inputs the transport streams TS1 to TSn of each service output from the stream control unit 201 in parallel, encrypts them using an encryption key unique to the digital broadcast receiving apparatus 1, and transmits all the transport streams. The port streams TS1 to TSn are stored in the storage device 413. The local encryption / decryption unit 412 reads one of the encrypted transport streams TS1 to TSn of each service from the storage device 413, decrypts it using the decryption key unique to the digital broadcast receiving device 1, and forms the transport stream TS0. Output.

  The DEMUX unit 501 separates the video / audio stream from any one transport stream TS1, TS2,..., TSn or TS0 output from the stream control unit 201 or the storage unit 401, and the video decoder unit 511 and the audio decoder To the unit 512.

  The video decoder unit 511 and the audio decoder unit 512 decode the video / audio stream output from the DEMUX unit 501 and output a video signal and an audio signal.

  Next, the operation of the digital broadcast receiving apparatus 1 in FIG. 1 will be described.

  (1) The tuner unit 101 receives a broadcast signal of one channel of terrestrial digital broadcasting (for 13 segments) and outputs a transport stream TS (scrambled state).

  (2) The scrambled TS packet included in the transport stream TS output from the tuner unit 101 is descrambled by the descrambling unit 211 in the stream control unit 201. The stream control unit 201 also collects PSI / SI information from the transport stream TS and outputs it to the reception control unit (main) 301. Information about the PID of the descrambling target TS packet and the key used in the descrambling process is supplied from the reception control unit 301 (main) as described later.

  (3) The reception control unit 301 (main) acquires PSI / SI information necessary for reception control from the stream control unit 201, detects a multi-organized program (service), and receives the reception control units 311 to 31n ( Sub) is started in a separate thread for the number of services.

  (4) The reception control units 311 to 31n (sub) are required when acquiring PSI / SI information regarding each service via the reception control unit 301 (main) and generating a transport stream corresponding to each service. A list of stream PIDs and ECM PIDs necessary for descrambling each video / audio stream is generated and set on the reception control unit 301 (main) side.

  (5) The reception control unit (main) 301 merges the information for each service set by the reception control units (sub) 311 to 31n, and integrates the PID of the stream that requires descrambling and the PID of the corresponding ECM. To do. These pieces of information are output from the reception control unit (main) 301 to the stream control unit 201. Further, the reception control unit (main) 301 acquires the necessary ECM from the stream control unit 201, acquires a descrambling processing key from the digital broadcast receiving IC card 601 based on the information of each ECM, and the descrambling unit A descrambling target PID and a key are set for 211.

  (6) Also, the reception control unit (main) 301 sends the PIDs of TS packets (video, audio, PAT, PMT, EIT, etc.) necessary to generate a transport stream for each service to the stream distribution unit 212. Set for

  (7) The stream distribution unit 212 generates and outputs transport streams TS1 to TSn for each service according to the PID list for each service set by the reception control unit (main) 301.

  (8) The transport streams TS1 to TSn of each service are input to the storage unit 401 and stored in the storage device 413 after being encrypted by the local encryption unit 411.

  (9) The storage unit 401 selects one of the stored transport streams TS1 to TSn according to an instruction from the user, etc., decrypts it with the local encryption / decryption unit 412 and outputs it as the transport stream TS0. .

  (10) One of the transport streams TS1 to TSn corresponding to each service or the transport stream TS0 corresponding to one service read from the storage device 413 is converted into a video stream by the DEMUX unit 501. And audio stream. Then, the video stream and the audio stream separated by the DEMUX unit 501 are sent to the video decoder unit 511 / audio decoder unit 512, thereby outputting video output and audio output. By outputting and reproducing this video output and audio output with a video / audio output device such as a TV monitor, the viewer can view any program in the multi-organized broadcast or any program recorded in the multi-organized broadcast, for example. can do.

  Next, effects of the above-described embodiment of the present invention will be described. In the embodiment of the present invention, all of a plurality of multi-organized services (programs) included in the terrestrial digital broadcast received by one tuner can be received and stored, and the plurality of received services or stored services (programs) ).

  That is, according to the present invention, it is possible to record all programs that are multi-organized into one broadcast wave and broadcast without preparing a plurality of tuners. The reason is that in multi-organization broadcasting in digital terrestrial broadcasting, a plurality of services are multiplexed and transmitted in one transport stream and can be received at one tuner at a time. This is because it is possible to obtain transport streams of all services that are multi-organized without preparing a plurality of tuners by simultaneously performing and distributing the transport streams for each service.

  The present invention can be applied to a terrestrial digital broadcast compatible hard disk recorder or the like, but can also be applied to BS / CS (broadcast satellite / communication satellite) digital broadcast.

  The embodiment of the present invention is not limited to the above. For example, each block in FIG. 1 is further divided so that the function realized by each block is performed by a plurality of blocks, or each block is integrated. A function realized by a plurality of blocks can be realized by one or a small number of blocks. Also, instead of the tuner unit, a configuration that receives a predetermined signal via a communication line and outputs a transport stream is provided, or descramble information is obtained from another configuration instead of the digital broadcast receiving IC card Changes to be made can be made as appropriate. Further, the present invention can be configured using a computer and a program executed by the computer, and the program in that case can be provided via a computer-readable recording medium or a communication line.

  DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiver, 101 ... Tuner part, 201 ... Stream control part, 211 ... Descramble part, 212 ... Stream distribution part, 411 ... Local encryption part, 412 ... Local encryption / decryption part, 413 ... Memory | storage device, 301 ... Reception control unit (main) (= main reception control unit in claims), 311 to 31n ... Reception control unit (sub) (= sub reception control unit in claims), 401 ... accumulation unit, 501 ... DEMUX unit, 511... Video decoder unit, 512.

Claims (4)

A tuner that receives digital broadcasts and outputs a transport stream;
Information related to the service included in the transport stream output from the tuner unit is collected and output to the main reception control unit, and the transport stream is descrambled using the information input from the main reception control unit. A stream control unit that distributes and outputs a transport stream for each service;
Based on the information related to the service collected by the stream control unit, a plurality of secondary reception control units for the number of services are started, and information based on the control result by the secondary reception control unit is output to the stream control unit A control unit;
A plurality of sub-reception control units each performing reception control of each service;
An accumulation unit for accumulating the encrypted transport stream for each service output from the stream control unit;
A DEMUX unit that separates a video / audio stream from a transport stream corresponding to any one of the services output from the stream control unit or the storage unit;
A video decoder unit for decoding the video stream output from the DEMUX unit;
A digital broadcast recording apparatus comprising: an audio decoder unit that decodes an audio stream output from the DEMUX unit. The transport stream output from the tuner unit is composed of a plurality of transport stream packets identified by packet identifiers,
The plurality of sub-reception control units generate a list of identifiers of transport stream packets used in the processing of each service as the reception control, and set to the main reception control unit ,
The digital broadcast recording apparatus according to claim 1, wherein the main reception control unit supplies information set by the sub reception control unit to the stream control unit. A transport stream including information indicating a key required for descrambling the video / audio stream of each service in a list of identifiers of transport stream packets set by the plurality of sub reception control units in the main reception control unit The digital broadcast recording apparatus according to claim 2, wherein an identifier of the packet is included. The tuner unit receives digital broadcasts and outputs a transport stream.
The stream control unit collects information related to the service included in the transport stream output from the tuner unit, outputs the collected information to the main reception control unit, and uses the information input from the main reception control unit. Descramble the port stream, distribute and output the transport stream for each service,
The main reception control unit activates a plurality of sub reception control units for the number of services based on the information related to the service collected by the stream control unit, and transmits information based on the control result by the sub reception control unit to the stream Output to the control unit,
Each of the plurality of secondary reception control units performs reception control of each service,
The storage unit encrypts and stores the transport stream for each service output from the stream control unit,
The DEMUX unit separates a video / audio stream from a transport stream corresponding to any one of the services output from the stream control unit or the storage unit,
The video decoder unit decodes the video stream output from the DEMUX unit,
A digital broadcast recording method, wherein an audio stream output from the DEMUX unit is decoded by an audio decoder unit.

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