JP2008066855A - Terrestrial digital broadcast recording unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable use of contents for stationary units and for portable units mutually independently, protecting the copyright of terrestrial digital broadcast contents. <P>SOLUTION: A terrestrial digital broadcast recording unit includes a recording section (17) in which a variety of data are recorded, a reception data processing section (14) for recording a TS including a plurality of partial TSs demodulated from a received terrestrial digital broadcast wave into the recording section (17), and an external input/output section (18) performing data input and output between the recording section (17) and the outside of the unit concerned. The external input/output section (18) extracts a predetermined partial TS from the recording section (17), and outputs the above extracted data to the outside of the unit concerned. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a terrestrial digital broadcast recording apparatus, and more particularly to a technique for transferring terrestrial digital broadcast content recorded in the apparatus to another apparatus.

  In recent years, terrestrial digital broadcasts obtained by digitizing existing terrestrial analog television broadcast signals are becoming widespread. In digital terrestrial broadcasting, one broadcast band is divided into 13 segments, of which 12 segments are mainly used for high-definition broadcasting or standard broadcasting for stationary devices, and the remaining one segment is mainly used. It is used for so-called one-segment broadcasting for simple receivers such as mobile terminals.

  Content provided by digital terrestrial broadcasting has high image quality and high sound quality, and has the characteristics that the quality does not deteriorate even if it is duplicated repeatedly. Therefore, especially in digital terrestrial broadcasting, content copyright protection is an important matter, and the number of copies is limited to one using a technique such as CPRM (Content Protection for Recordable Media) (copy once). The content for which the copy-once restriction has been made is counted as the first copy, for example, when it is recorded on a recording device placed at home, and is not allowed to be copied again, and can only be moved or deleted.

  When the content of digital terrestrial broadcasting with such copyright protection is shared between an indoor stationary apparatus and a portable apparatus, the following problems arise. In other words, in general, stationary devices have a function to record and play back high-quality and high-quality content and have a large recording capacity, whereas portable devices have playback capabilities due to restrictions on size, weight, selling price, etc. Is low and the recording capacity is small. Therefore, in order to play back the content recorded on the stationary device on the portable device, down-conversion or the like is performed so that the image quality sound quality and the data size are suitable for the playback capability of the portable device. However, even if down-converted, as long as the content is transferred to the portable device, it is not allowed to keep the original content as it is in the stationary device due to copy-once restrictions. Therefore, to transfer the content recorded on the stationary device to the portable device and then reproduce the content on the stationary device again, the content transferred to the portable device needs to be moved to the stationary device. However, the content is down-converted, and even when it is played back by a stationary device, it can no longer be played back with high image quality and high sound quality originally held by the original content.

Conventionally, in order to solve the above problem, when content is transferred from the first device to the second device, the original content is stored in an encrypted state in the first device and stored in the second device. There are those that transfer the down-converted content (see, for example, Patent Document 1). According to this, while the copyright of the content stored in the first device can be protected by encryption, the content down-converted in the second device can be reproduced and transferred to the second device. By decrypting the encrypted content stored in the first device using the content as a key, the high-quality and high-quality original content can be reproduced again on the first device.
JP 2005-277493 A

  However, if the above technique does not manage both the original content stored in the stationary device and the down-converted content transferred to the portable device as a pair, the first device can reproduce the original content again. It may be impossible. For example, when the content transferred to the second device is not at hand, the original content cannot be reproduced on the first device. Furthermore, if the down-converted content is lost or deleted, the content cannot be played back on the second device, and a key for decrypting the encrypted content stored in the first device is available. As a result, the original content can no longer be reproduced in the first device.

  In view of the above problems, an object of the present invention is to make it possible for a terrestrial digital broadcast recording apparatus to use content for a stationary apparatus and content for a portable apparatus independently of each other.

  Means taken by the present invention to solve the above problems is a terrestrial digital broadcast recording apparatus, a transport unit including a recording unit for recording various data and a plurality of partial TS demodulated from the received terrestrial digital broadcast wave. It is assumed that a reception data processing unit that records a stream (TS) in a recording unit and an external input / output unit that inputs and outputs data between the recording unit and the outside of the apparatus are provided. The external input / output unit extracts a predetermined partial TS from the recording unit, and outputs the extracted data to the outside of the apparatus.

  According to this configuration, a TS including a plurality of partial TSs is recorded in the recording unit, and a predetermined partial TS can be extracted therefrom and output to the outside of the apparatus. As a result, when the predetermined partial TS is extracted from the recording unit, it can no longer be used in the device. However, the other partial TS remaining in the recording unit is independent of the data output to the outside of the device. Can be used.

  Specifically, the external input / output unit extracts a partial TS for broadcasting for a simple receiver or broadcasting for a stationary receiver.

  Preferably, the recording unit includes first and second recording devices. The received data processing unit records the TS on the first recording device, separates a predetermined partial TS from the TS, and records the separated data on the second recording device. The external input / output unit extracts a predetermined partial TS from the second recording device.

  According to this, a predetermined partial TS is separated from the TS by the received data processing unit, and the separated data is recorded in the dedicated second recording device. Then, data is extracted from the second recording device by the external input / output unit, and a predetermined partial TS is output outside the device. Here, the separation process of the partial TS is performed by the reception data processing unit. Since the reception data processing unit originally has the function, the process can be realized without increasing the hardware scale.

  Preferably, the recording unit includes first and second recording devices. The received data processing unit separates the TS into a predetermined partial TS and the others, and records the former on the second recording device, while recording the latter on the first recording device. Then, the external input / output unit extracts a predetermined partial TS from the second recording device.

  According to this, the received data processing unit separates the TS into a predetermined partial TS and the other TS, the predetermined partial TS is in the second recording device, and the other partial TS is in the first recording device, Each is recorded. Then, data is extracted from the second recording device by the external input / output unit, and a predetermined partial TS is output outside the device. Here, the separation process of the partial TS is performed by the reception data processing unit. Since the reception data processing unit originally has the function, the process can be realized without increasing the hardware scale. Further, when reproducing a TS from which a predetermined partial TS has been removed in the apparatus, the separation process is no longer necessary, and it is only necessary to read data from the first recording apparatus.

  Preferably, the external input / output unit generates copyright protection information for the extracted partial TS, and outputs the information together with the extracted partial TS to the outside of the apparatus. According to this, the copyright of the broadcast content output to the outside of the device can be protected.

  Preferably, the external input / output unit inserts dummy data into a portion where a predetermined partial TS is extracted from the recording unit. More preferably, the dummy data is assumed to be a NULL packet. Specifically, the external input / output unit extracts a predetermined partial TS from the outside of the device, and the dummy data is replaced with the extracted data in the recording unit.

  According to this, the predetermined partial TS extracted from the recording unit cannot be read again from the recording unit, and the copyright of the content is protected. Further, when the data output to the outside of the apparatus is retrieved and the TS is restored, the position where the data is to be restored in the recording unit is indicated by the dummy data, so that the restoration process of the TS is facilitated.

  Preferably, the external input / output unit rewrites the packet identifier of the part where the predetermined partial TS is extracted in the recording unit to another one. More preferably, the external input / output unit extracts a predetermined partial TS from the outside of the device, and returns the packet identifier of the portion corresponding to the extracted partial TS in the recording unit to its original state.

  According to this, the predetermined partial TS extracted from the recording unit cannot be read from the recording unit and played back, and the copyright of the content is protected. In addition, when the data output to the outside of the apparatus is retrieved and the TS is restored, the position where the data is to be returned in the recording unit is indicated by the rewritten packet identifier, so that the restoration process of the TS is facilitated.

  As described above, according to the present invention, content for a stationary device and content for a portable device can be used independently of each other.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 shows the configuration of a digital terrestrial broadcast recording apparatus according to the first embodiment. This apparatus includes an antenna 11, a tuner 12, a demodulation unit 13, a reception data processing unit 14, a decoding processing unit 15, an output unit 16, a recording unit 17, and an external input / output unit 18.

  The antenna 11 receives a terrestrial digital broadcast wave. Specifically, the antenna 11 is a whip (rod) antenna, a dipole antenna, a Yagi / Uda antenna, a parabolic antenna, a loop antenna, a dielectric antenna, or the like.

  The tuner 12 tunes the received broadcast wave to a frequency corresponding to the designated channel to select a desired channel. The demodulator 13 demodulates digital stream data, specifically, a transport stream (TS) from a signal received through the selected channel. The TS is obtained by multiplexing data such as video, audio, and section information.

  The TS includes 13 segments of data. Of the 13 segment data, 12 segment data is a partial TS broadcast for a stationary receiver, and the remaining 1 segment data is a broadcast TS for a simple receiver. Note that the broadcast partial TS for stationary receivers does not limit the application to stationary receivers. The partial TS for broadcasting to a stationary receiver is data that enables reproduction of high-quality and high-quality sound content, and is mainly used in a stationary receiver that can reproduce high-quality and high-quality sound content. Further, the partial TS for broadcasting for a simple receiver is not limited to the simple receiver. Partial TS for broadcasts for simplified receivers is data that has lower image quality and lower data quality than playback for partial TSs for stationary receivers, but is used mainly by simplified receivers. .

  The reception data processing unit 14 separates the TS including all the 13-segment data supplied from the demodulation unit 13 into a partial TS for broadcasting for a simple receiver and a partial TS for broadcasting for a stationary receiver. Further, the reception data processing unit 14 separates each partial TS into various data such as video PES (packetized elementary stream) that is video data and audio PES that is audio data. The data is based on a predetermined standard. The standard for video data is MPEG (Motion Picture Experts Group) -2 for broadcasting for stationary receivers. In 1Seg broadcasting, H. H.264. On the other hand, as a standard for audio data, there is MPEG-2 AAC for broadcasting for stationary receivers. One-segment broadcasting includes MPEG-2 AAC and MPEG-2 AAC + SBR.

  The decode processing unit 15 decodes various data separated by the reception data processing unit 14 and outputs YUV signals, RGB signals, etc. for video and PCM signals, etc. for audio. The output unit 16 outputs various signals output from the decode processing unit 15 in a form that allows the user to recognize them. Specifically, an image is displayed on a display device such as a CRT, LCD, PDP, or organic EL, and sound is output from a sound output device such as a speaker, earphone, or headphone.

  In terrestrial digital broadcasting, a plurality of different broadcast contents can be broadcast using one broadcast channel. Independent broadcasts are broadcast on a single broadcast channel using this technology for broadcasts for simple receivers and broadcasts for stationary receivers.

  Each broadcast content is composed of a unit called a partial TS, and the partial TS is composed of a packet called a smaller TS packet. The TS packet is a fixed length packet of 188 bytes. By broadcasting TS packets constituting each broadcast content in a time-sharing manner, it is possible to broadcast a plurality of different broadcast contents on the aforementioned one broadcast channel. FIG. 2A shows a schematic diagram in which TS packets are transmitted in a time division manner. The reception data processing unit 14 supplies the TS including the data of all 13 segments (broadcast for a simple receiver and broadcast for a stationary receiver) to the recording unit 17.

  The recording unit 17 records a TS including all the 13 segment data supplied from the received data processing unit 14 as a file. Specifically, the recording unit 17 is configured by a recording device that can hold data even when the power of the flash memory, the optical disk device, the magnetic disk device, or the like is turned off. When playing back the recorded content, the reception data processing unit 14 appropriately reads out the file recorded in the recording unit 17 and supplies the partial TS for the stationary receiver included in the read file to the decoding processing unit 15. To do.

  As shown in FIG. 2B, the external input / output unit 18 extracts a part or all of the partial TS of the broadcast for the simplified receiver from the file specified by the user among the files recorded in the recording unit 17. The extracted partial TS is output to the outside of the apparatus. The output destination is a recording medium such as a memory card, an optical disk, or a magnetic disk, a device provided with these recording media, a wired or wireless network, and the like. Here, “extracting” data means that the recording unit 17 deletes or destroys the data, or at least makes the data unusable as it is. This is based on a request for copyright protection in which re-copying of content once recorded is not permitted.

  Specifically, as shown in FIG. 2C, the external input / output unit 18 inserts dummy data into the portion where the partial TS of the broadcast for the simple receiver is extracted in the recording unit 17. As a result, the copyright of the one-segment broadcasting content can be protected, and the bit rate related to the playback of the high-definition broadcasting or standard broadcasting content recorded in the recording unit 17 in this apparatus can be kept constant. Further, as will be described later, in the case where the partial TS is retrieved from the outside of the apparatus and the partial TS of the recording unit 17 is restored, the restoration target portion can be determined.

  It is preferable to use a NULL packet as the dummy data. Since a NULL packet has a uniform data arrangement, efficiency is improved when data compression is performed. Instead of inserting dummy data, the PID of the packet may be rewritten with a special one not included in the partial TS, or the data body of the packet may be encrypted. In order to encrypt the data body, it is necessary to provide a separate encryption processing unit, but it is superior in copyright protection compared to PID rewriting. On the other hand, although PID rewriting is inferior to copyright protection than encryption, it is excellent in that it can be realized without adding hardware.

  Further, the external input / output unit 18 generates copyright protection information about the partial TS for broadcasting to the simplified receiver extracted from the recording unit 17 and outputs the information together with the extracted partial TS to the outside of the apparatus. As a result, the content output outside the apparatus cannot be copied, and the copyright of the content is protected.

  Furthermore, when the external input / output unit 18 retrieves the partial TS output to the outside of the apparatus, the recording unit 17 restores the retrieved partial TS. Specifically, the external input / output unit 18 extracts the partial TS from the outside of the apparatus, and replaces the dummy data in the recording unit 17 with the extracted partial TS. Further, when the PID of the partial TS is rewritten in the recording unit 17, the PID of the partial TS is restored, and when the data body is encrypted, the decrypting process is performed. As a key necessary for the decryption, for example, a key added to the partial TS output outside the apparatus is used. When extracting a partial TS from the outside of the apparatus, it is desirable to completely delete the partial TS from the viewpoint of copyright protection.

  Next, external output of one-segment broadcasting content by this apparatus will be described with reference to the flowchart of FIG. First, it is detected that an external medium or device is connected to the apparatus (step S11). Thereafter, the one-segment broadcasting content file recorded in the recording unit 17 is designated to be output to the connected external medium or device (step S12). The user can specify a file through a man-machine interface such as a button, a mouse, a keyboard, or a touch panel (not shown). Then, it is determined whether or not the designated file exists in the recording unit 17 (step S13). If the file exists (YES in step S13), further broadcasting to the simplified receiver is performed on the file. It is determined whether or not the partial TS is included (step S14). If a partial TS for a simple receiver is included (YES in step S14), it is extracted from the recording unit 17 (step S15), and the extracted partial TS is connected to this apparatus. Is output to an external medium or device (step S16).

  Specifically, the external input / output unit 18 is a PMT (Program Map Table) in which a packet identifier (PID) of “1FC8” to “1FCF” is stored from the partial TS recorded in the recording unit 17. Find out. The PMT describes each PID of audio, video, and section information included in a partial TS for broadcasting to a simple receiver. The extraction of the partial TS is as described above.

  As described above, according to the present embodiment, the high-definition broadcast content for the stationary device and the one-segment broadcast content for the portable device can be used independently of each other while protecting the copyright of the broadcast content. That is, even if the one-segment broadcasting content output to the outside of the device is lost, the high-definition broadcasting content having the same content can be reproduced on the device.

  Note that it is possible to extract only a part of data such as video data, audio data, or caption data, and output it to the outside, instead of all data for the one-segment broadcasting content. Further, the audio data and video data of the one-segment broadcasting are packetized in the PES format, but this may be further analyzed to output ES (elementary stream) format data to the outside. Furthermore, data to be output to the outside may be converted into another format by down-conversion, transcoding, re-encoding, or the like.

  Alternatively, a partial TS for broadcasting for a simple receiver may be left in the recording unit 17, and the high-vision broadcast or standard broadcast partial TS may be extracted from the recording unit 17 and output to the outside.

(Second Embodiment)
FIG. 4 shows the configuration of a digital terrestrial broadcast recording apparatus according to the second embodiment. In this apparatus, the recording unit 17 in the terrestrial digital broadcast recording apparatus according to the first embodiment is configured by two recording apparatuses 171 and 172. Specifically, the recording devices 171 and 172 are a flash memory, an optical disk device, a magnetic disk device, and the like. Only differences from the first embodiment will be described below.

  When recording the broadcast content, the reception data processing unit 14 supplies the TS including the data of all 13 segments to the recording device 171 as shown in FIG. 2A, and the TS supplied from the demodulation unit 13. The partial TS for broadcasting for the simple receiver is separated into the partial TS for broadcasting for the stationary receiver and the partial TS for broadcasting for the stationary receiver, and as shown in FIG. Supply. That is, the recording device 172 is provided exclusively for recording one-segment broadcasting. The external input / output unit 18 extracts part or all of the partial TS from the file specified by the user among the files recorded in the recording device 172, and outputs the extracted partial TS to the outside of the apparatus. The extraction of the partial TS is as described above. Also, since all the partial TSs recorded in the recording device 172 are related to the one-segment broadcasting, the external input / output unit 18 is used for the partial TS for the simple receiver and the stationary receiver when the partial TS is extracted. It is not necessary to separate the broadcast partial TS.

  As shown in FIG. 2C, the recording device 171 may record only a partial TS for broadcasting for a stationary receiver. That is, the recording device 171 may be a recording device dedicated to a partial TS for broadcasting for a stationary receiver. Thereby, the duplicate recording of the partial TS of the broadcast for the simple receiver by the recording devices 171 and 172 is eliminated, and the resource consumption of the recording unit 17 as a whole is reduced.

  The digital terrestrial broadcast recording apparatus according to the present invention has a digital terrestrial broadcast function in order to make it possible to use content for a stationary device and content for a portable device independently of each other while protecting the copyright of the broadcast content. It is useful as an HDD recorder, DVD recorder, STB, etc.

1 shows a configuration of a terrestrial digital broadcast recording apparatus according to a first embodiment. It is a figure which shows TS packet structure. It is a flowchart of the external output of the 1 seg broadcast content by the terrestrial digital broadcast recording apparatus shown in FIG. The structure of the terrestrial digital broadcast recording apparatus which concerns on 2nd Embodiment is shown.

Explanation of symbols

14 Received Data Processing Unit 17 Recording Unit 18 External Input / Output Unit 171 Recording Device (First Recording Device)
172 Recording device (second recording device)

Claims (11)

A terrestrial digital broadcast recording device,
A recording unit for recording various data;
A received data processing unit that records a transport stream (TS) including a plurality of partial TS demodulated from the received terrestrial digital broadcast wave in the recording unit;
An external input / output unit for inputting / outputting data between the recording unit and the outside of the apparatus, wherein the external input / output unit extracts a predetermined partial TS from the recording unit, and extracts the extracted data from the apparatus A terrestrial digital broadcast recording apparatus characterized by being output to In the terrestrial digital broadcast recording apparatus according to claim 1,
The external terrestrial digital broadcasting recording apparatus, wherein the external input / output unit extracts a partial TS for broadcasting for a simple receiver. In the terrestrial digital broadcast recording apparatus according to claim 1,
The external terrestrial digital broadcasting recording apparatus, wherein the external input / output unit extracts a partial TS for broadcasting for a stationary receiver. In the terrestrial digital broadcast recording apparatus according to claim 1,
The recording unit includes first and second recording devices,
The received data processing unit records the TS on the first recording device, separates the predetermined partial TS from the TS, and records the separated data on the second recording device. ,
The digital terrestrial broadcast recording apparatus, wherein the external input / output unit extracts the predetermined partial TS from the second recording apparatus. In the terrestrial digital broadcast recording apparatus according to claim 1,
The recording unit includes first and second recording devices,
The received data processing unit separates the TS into the predetermined partial TS and the others, and records the former on the second recording device, while recording the latter on the first recording device. And
The digital terrestrial broadcast recording apparatus, wherein the external input / output unit extracts the predetermined partial TS from the second recording apparatus. In the terrestrial digital broadcast recording apparatus according to claim 1,
The digital terrestrial broadcasting recording apparatus characterized in that the external input / output unit generates copyright protection information for the extracted partial TS and outputs the information together with the extracted partial TS to the outside of the apparatus. In the terrestrial digital broadcast recording apparatus according to claim 1,
The digital terrestrial broadcasting recording apparatus, wherein the external input / output unit inserts dummy data into a portion where the predetermined partial TS is extracted from the recording unit. The terrestrial digital broadcast recording apparatus according to claim 7,
The digital terrestrial broadcast recording apparatus, wherein the dummy data is a NULL packet. The terrestrial digital broadcast recording apparatus according to claim 7,
The external terrestrial digital broadcasting recording apparatus, wherein the external input / output unit extracts the predetermined partial TS from the outside of the apparatus and replaces the dummy data with the extracted data in the recording unit. In the terrestrial digital broadcast recording apparatus according to claim 1,
The external terrestrial digital broadcast recording apparatus, wherein the external input / output unit rewrites a packet identifier of a part from which the predetermined partial TS is extracted in the recording unit. The terrestrial digital broadcast recording apparatus according to claim 10,
The terrestrial digital broadcast recording apparatus, wherein the external input / output unit extracts the predetermined partial TS from the outside of the apparatus, and returns the packet identifier of a portion corresponding to the extracted partial TS in the recording unit.

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