JP2008193273A - Digital broadcast receiver, recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast recording apparatus easily reproducing a program obtained by receiving digital broadcasting and recorded in a storage device, at a portable terminal or a mobile terminal such as an automobile. <P>SOLUTION: When recording data on a recording medium in a digital broadcast receiver, a partial TS for fixed receiving system and a partial TS for mobile station are recorded. Then, the partial TS for mobile station is moved to an external recording medium 113 from the recording medium. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a digital broadcast receiver capable of recording and reproducing broadcast programs.

  In recent years, the transition from the analog system of TV broadcasting to the digital system has been promoted worldwide, and terrestrial digital broadcasting has also started in Japan. The feature of digital terrestrial broadcasting in Japan is that segment division OFDM (Orthogonal Frequency Division Multiplex) is used as the transmission method. Furthermore, by switching the modulation method and error correction method for each segment, hierarchical transmission of up to three layers is possible. It adopts a possible method. By using such a hierarchical transmission method, it is possible to perform broadcasting assuming different usage forms such as broadcasting for mobile reception (strong hierarchy) and broadcasting for fixed reception (weak hierarchy). Thus, since television viewing on a portable terminal is possible, content can be moved and viewed via an external recording medium.

  Incidentally, a copy-once system has been proposed as a copyright protection mechanism in the Japanese digital broadcasting system. Content recorded with this copy-once identifier cannot be copied to another recording medium when recorded with a built-in hard disk recorder or the like. However, if the original content is deleted, copying to another recording medium is permitted.

  When copying such content with copyright protection to an external recording medium, if there is the same content as the content recorded on the hard disk in the external recording medium, the content without the hard disk is given priority. A technique for reproducing is disclosed. (For example, refer to Patent Document 1).

JP 2006-216164 A

  However, according to the above-described conventional recording apparatus, the content in the hard disk cannot be reproduced unless the external recording medium containing the content copied from the hard disk is at hand, which is inconvenient for the viewer.

  The present invention has been made in view of such a situation, and makes it possible to easily reproduce a program recorded in a storage device by receiving a digital broadcast on a mobile terminal or a mobile terminal such as an automobile. To provide a digital broadcast receiving apparatus and a recording apparatus.

  In order to solve the above problems, for example, when recording on a recording medium, the weak hierarchical partial TS and the strong hierarchical partial TS are recorded, and the strong hierarchical partial TS is moved from the recording medium to the external recording medium.

  ADVANTAGE OF THE INVENTION According to this invention, the digital broadcast recording device which makes it possible to easily reproduce | regenerate the program which received digital broadcasting and recorded on the storage device with mobile terminals, such as a portable terminal or a motor vehicle, can be provided. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts.

  FIG. 1 is a block diagram showing an outline of an apparatus according to Embodiment 1 of the present invention. In FIG. 1, a receiving antenna 101 receives a terrestrial digital broadcast radio wave and supplies it to a tuner 102. The tuner 102 selects a digital broadcast signal of a desired channel from the supplied terrestrial digital broadcast radio wave and supplies it to the demodulation unit 103. The demodulation unit 103 performs demodulation and error correction processing on the supplied digital broadcast signal, and supplies the digital broadcast signal to the demultiplexing unit 104 as a transport stream (hereinafter referred to as TS) signal. The demultiplexing unit 104 performs TS packet header analysis on the supplied TS signal with a PID filter or the like, and separates the data into video / audio / section TS / independent PES data, and then video ES (Elementary Stream, hereinafter referred to as ES). ) Is supplied to the video decoder 105, and the audio ES is supplied to the audio decoder 106. The video decoder 105 decodes the supplied video ES and outputs a video signal 107. The audio decoder 106 decodes the supplied audio ES and outputs an audio signal 108.

  Further, each TS signal demultiplexed by the demultiplexing unit 107 is supplied to the remultiplexing unit 109, remultiplexed into a partial TS signal composed of one or a plurality of programs, and the recording device interface unit 110 and the external It is supplied to the recording medium interface unit 111. The recording apparatus interface unit converts the supplied partial TS signal into a signal having a standard corresponding to the recording apparatus, and supplies the converted signal to the recording apparatus 112. The partial TS signal recorded in the recording device 112 can be supplied to the external recording medium 113 via the external recording medium interface unit 111 and transferred. The information recorded in the recording device 112 can be read out to the demultiplexing unit 104 via the recording device interface unit 110. Further, the tuner 102, the demodulating unit 103, the demultiplexing unit 104, the remultiplexing unit 109, the recording device interface unit 110, and the external recording medium interface unit 111 are respectively controlled by the control unit 114.

  FIG. 2 is an explanatory diagram showing an outline of the hierarchical transmission method used in Japanese terrestrial digital broadcasting. In the digital terrestrial broadcasting system, one OFDM transmission signal 200 is formed by connecting 13 OFDM segments obtained by equally dividing a television broadcast channel bandwidth of 6 MHz into 14 equal parts. Transmission parameters can be changed in units of OFDM segments, and hierarchical transmission of up to three layers can be performed. FIG. 2 shows an example in which one central segment is operated as the strong hierarchy 202 and the other 12 segments are operated as the weak hierarchy 201. The above-mentioned strong and weak layers are stipulated in the digital terrestrial broadcasting operation regulations (ARIB TR-B14), and the transmission capacity is high but the layer relatively weak to transmission errors is compared to the weak layer and the transmission capacity is low but compared to transmission errors. Strong hierarchy is called strong hierarchy.

  The transmission parameters in the layer 201 have a modulation scheme of QPSK and a convolutional code coding rate of 2/3. The types of packets transmitted in the strong layer 201 are shown in the strong layer TS packet list 203. PMT 205, data ES 206, simple video ES 207, audio ES 208, and PCR 209 are transmitted, and a broadcast service for portable receivers is performed using these packets. Also, PAT is not included.

  Transmission parameters in the layer 202 have a modulation scheme of 64QAM and a convolutional code coding rate of 7/8. Types of packets transmitted in the weak layer 202 are shown in the weak layer TS packet list 204. The PAT 210, the PMT 211, the video ES 212, and the audio ES 213 are transmitted, and the broadcast service for the fixed receiver is performed using these packets.

  Here, the video and audio of the broadcast service for portable receivers are those obtained by compressing the video and audio of the broadcast service for fixed receivers by rate conversion, and simultaneous broadcasting in which the same content is broadcast is performed. .

  Hereinafter, the operation of the control unit 114 of the present embodiment when the selected channel is subjected to hierarchical transmission with the contents shown in FIG. 2 will be described with reference to FIG.

  First, the operation when the recording device 112 records the TS signal selected by the tuner 102 and demodulated and error-corrected by the demodulator 103 will be described.

  The demultiplexing unit 104 supplies the TS signal demultiplexed into the video / audio / section TS / independent PES data to the remultiplexing unit 109. Next, the remultiplexing unit 109 remultiplexes the TS packet shown in the weak layer TS packet list 204 and the PCR packet 209 from each supplied TS signal, and provides a weak reception partial TS that provides a broadcast service for fixed reception. The signal is supplied to the recording device interface unit 110 as a signal.

  In parallel with this, the remultiplexing unit 109 remultiplexes the TS packets shown in the strong layer TS packet list 203 from the supplied TS signals, and provides a strong layer partial TS signal that provides a broadcast service for mobile reception. To the recording device interface unit 110. Then, two partial TS signals are supplied from the recording apparatus interface unit 110 to the recording apparatus 112, and two partial TSs are recorded in the recording apparatus 112. At this time, in order to protect the recording capacity of the recording device, it is also possible to reduce the frame rate of the weak hierarchical partial TS signal that provides a broadcast service for fixed reception.

  Next, an operation for reproducing a program recorded in the recording device 112 will be described. In normal reproduction, a weak hierarchical partial TS that enables high-quality video and audio viewing is reproduced.

  The control unit 114 reads the weak hierarchical partial TS signal of the program selected by the viewer from the recording device 112 and supplies it to the demultiplexing unit 104 via the recording device interface unit 110. The demultiplexing unit 104 demultiplexes the supplied partial TS, and supplies the video ES to the video decoder 105 and the audio ES to the audio decoder 106. The video decoder 104 decodes the supplied video ES and outputs a video signal, and the audio decoder 106 decodes the supplied audio ES and outputs an audio signal 108. The partial TS played back at this time can output the original high-quality video and audio.

  Next, an operation when data is moved to the external recording medium 113 for the purpose of viewing a program recorded in the recording device 112 with a portable terminal or another simple player will be described. In this case, the screen size of the mobile phone or other simple player is relatively small, and the viewer can sufficiently enjoy even a low-rate video. Therefore, it is assumed that the strong hierarchical partial TS is moved to the external recording medium 113.

  When a viewer inserts an external recording medium 113 such as an SD card, a USB memory, or a compact flash (registered trademark) into the external recording medium interface 111 and instructs to move data, the portable recording recorded in the recording device 112 is for mobile reception. A strong hierarchical partial TS signal that provides a broadcast service is read and recorded on the external recording medium 113 via the recording device interface unit 110 and the external recording medium interface unit 111.

  At this time, the strong hierarchical partial TS signal that provides the broadcast service for mobile reception recorded in the recording device 112 is deleted. On the other hand, the weak hierarchical partial TS that provides the broadcasting service for the fixed receiver recorded in the recording device 112 can be left in a stored state and can be reproduced. Then, the viewer can use the external recording medium 113 to move the data to a mobile phone or other simple player and view the recorded program.

  As described above, in the present embodiment, when recording, the program transmitted in the weak hierarchy and the program transmitted in the strong hierarchy are recorded separately, so that the program transmitted in the weak hierarchy is deleted without being deleted. Since the program transmitted at a strong hierarchy can be moved to the recording medium, it can be easily reproduced by a mobile terminal such as a portable terminal or an automobile.

It is a block diagram which shows the outline of the apparatus in embodiment of this invention. (Example 1) It is explanatory drawing which shows the outline | summary of the hierarchical transmission system currently used by the Japanese terrestrial digital broadcasting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Receive antenna, 102 ... Tuner, 103 ... Demodulator, 104 ... Demultiplexer, 105 ... Video decoder, 106 ... Audio decoder, 107 ... Video signal, 108 ... Audio signal, 109 ... Remultiplexer, 110 ... Recording Device interface unit 111 ... External recording medium interface unit 112 ... Recording device 113 ... External recording medium 114 ... Control unit 200 ... OFDM transmission signal 201 ... Weak layer segment 202 ... Strong layer segment 203 ... Weak layer TS packet list, 204 ... Strong layer TS packet list, 205 ... PAT, 206, 209 ... PMT, 207, 211 ... Video ES, 208, 212 ... Audio ES, 210 ... Data ES, 211 ... Video ES, 213 ... PCR

Claims (8)

Tuner means for selecting a digital broadcast signal of a desired channel from terrestrial digital broadcast radio waves;
Demodulation means for performing demodulation and error correction processing on the digital broadcast signal selected by the tuner means;
Demultiplexing means for separating each TS signal subjected to demodulation and error correction processing by the demodulation means;
Remultiplexing means for remultiplexing each of the demultiplexed TS signals of the demultiplexing means into a weak hierarchical partial TS signal transmitted in a weak hierarchy and a strong hierarchical partial TS signal transmitted in a strong hierarchy;
Recording means for recording one or more partial TS signals remultiplexed by the remultiplexing means on a recording medium;
An external recording means for recording the strong hierarchical partial TS recorded on the recording medium by the recording means on an external recording medium;
With
When recording on the recording medium, record the weak hierarchical partial TS and the strong hierarchical partial TS,
A digital broadcast receiving apparatus, wherein the strong hierarchical partial TS is moved from the recording medium to the external recording medium.   2. The digital broadcast receiving apparatus according to claim 1, wherein the strong hierarchical partial TS is a TS including a broadcast program for mobile reception.   The digital broadcast recording apparatus according to claim 1, wherein the weak hierarchical partial TS is a TS including a program for broadcasting for fixed reception. Video decoding means for decoding the video ES demultiplexed by the demultiplexing means;
Audio decoding means for decoding the audio ES demultiplexed by the demultiplexing means;
The digital broadcast receiver according to claim 1, further comprising: Tuner means for selecting a digital broadcast signal of a desired channel from terrestrial digital broadcast radio waves;
Demodulation means for performing demodulation and error correction processing on the digital broadcast signal selected by the tuner means;
Demultiplexing means for separating each TS signal subjected to demodulation and error correction processing by the demodulation means;
Remultiplexing means for remultiplexing each of the demultiplexed TS signals of the demultiplexing means into a weak hierarchical partial TS signal transmitted in a weak hierarchy and a strong hierarchical partial TS signal transmitted in a strong hierarchy;
Recording means for recording one or more partial TS signals remultiplexed by the remultiplexing means on a recording medium;
An external recording means for recording the strong hierarchical partial TS recorded on the recording medium by the recording means on an external recording medium;
With
When recording on the recording medium, record the weak hierarchical partial TS and the strong hierarchical partial TS,
A recording apparatus that moves the strong hierarchical partial TS from the recording medium to the external recording medium.   The recording apparatus according to claim 5, wherein the strong hierarchical partial TS is a TS including a broadcast program for mobile reception.   The recording apparatus according to claim 6 or 7, wherein the weak hierarchical partial TS is a TS including a broadcast program for fixed reception. Video decoding means for decoding the video ES demultiplexed by the demultiplexing means;
Audio decoding means for decoding the audio ES demultiplexed by the demultiplexing means;
The recording apparatus according to claim 8, further comprising:

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