JP5782098B2 - Digital data recording / reproducing method and digital data recording / reproducing apparatus - Google Patents

Description

The present invention relates to a digital data recording / reproducing method and a digital data recording / reproducing apparatus for recording and reproducing digital data on a recording medium.

  MPEG video compression technology, in which video / audio data is digitized and compressed and encoded and recorded on a recording medium or transferred via a communication path, has come to be used in a wide variety of devices. For example, a DVD recording / reproducing apparatus using MPEG-2 Video (ISO / IEC13818-2) is a known consumer product. Also, with respect to television broadcasting, HD (High Definition) digital broadcasting that starts packet-multiplexed MPEG-2 Video has been started instead of conventional analog broadcasting. Recording devices that record this digital broadcast on a hard disk (HDD) or DVD have been commercialized.

  Generally, these devices have a function of moving data recorded in the HDD to a DVD. In the current digital broadcasting, multiplexing by a fixed-length packet called a transport stream (TS) in the MPEG-2 Systems (ISO / IEC13818-1 Systems) standard is performed. The recorded data is recorded in the HDD. On the other hand, DVD-Video Format and DVD Video Recording Format, which are standards for recording on DVD-R, DVD-RW, and DVD-RAM, comply with the PS format in MPEG-2 Systems as a basic multiplexing method. It is mandatory. When moving data in the HDD to a DVD, it was necessary to convert from TS to PS. Also, in HD broadcasting, for example, the broadcast is broadcast at a high resolution of 1920 × vertical 1080, but for DVD recording, it has been necessary to convert to a conventionally used resolution of 704 × 480. Since these conversion processes require processing time, there is a problem that even if the access speed of the HDD and DVD is sufficiently high, the speed at which the data recorded on the HDD is moved to the DVD cannot be increased. As means for solving these problems, for example, in Patent Document 1, a TS stream having high resolution and a stream converted from TS to PS resolution conversion and multiplexing method are recorded on an HDD and recorded on a DVD. In this case, a technique for moving at high speed by recording PS data on a DVD is disclosed.

JP 2003-111023 A

  However, in the above-mentioned Patent Document 1, when handling content that is restricted by copyright, the video / audio recording / reproducing apparatus is not allowed to record TS and PS at the same time. Could not do.

  The present invention provides a technique for moving data at high speed from a first medium on which a digital broadcast restricted by copyright is recorded to a second medium.

To solve the above SL problem, one of the basic concept of recording and reproducing method of digital data of the invention is a method for recording and reproducing digital data of the digital television broadcast, the first encoding format said digital data Is recorded on the first medium as the first data, and the digital data is recorded on the first medium as the second data of the second encoding method, and copying of the recorded digital data is prohibited. in the case in which, when the reproduction instruction by the user is made, the first to play only the first data from the media, when the movement instruction by user is made, the second data It moves from the first medium to the second medium, characterized by erasing the first data from the first medium. Another basic concept of the digital data recording / reproducing method of the present invention is a method for recording / reproducing digital data of digital television broadcasting, wherein the digital data is first data of a first multiplexing system. In the case where the digital data is further recorded as the second data of the second multiplexing method on the first medium, and copying of the recorded digital data is prohibited. When the user gives a reproduction instruction, only the first data can be reproduced from the first medium, and when the user gives a movement instruction, the second data is sent from the first medium to the first medium. To the second medium, and the first data is erased from the first medium.

  According to the present invention, it is possible to move from the first medium to the second medium at high speed even in digital broadcasting that is restricted by copyright.

It is a schematic view of a first embodiment of the engagement Ru video audio recording and reproducing system in the apparatus example of applying the method of recording and reproducing digital data of the present invention. Is a diagram illustrating contents recorded in engagement Ru HDD to video and audio recording and reproducing apparatus system shown in FIG.

  Hereinafter, the present invention will be described in detail with reference to examples.

Figure 1 is a schematic view of a first embodiment of the engagement Ru video audio recording and reproducing system in the apparatus example of applying the method of recording and reproducing digital data of the present invention. In the present embodiment, a function of receiving an HD digital broadcast as an example of the present invention, recording it on an HDD serving as a first medium, and moving it to a DVD-RAM serving as a second medium will be described.

  First, an operation when receiving an HD digital broadcast and recording it on the HDD will be described. An HD digital broadcast wave is input to the input terminal 10 from a ground wave antenna or a satellite parabona antenna (not shown). From this broadcast wave, the tuner 11 selects data of a desired channel by the user, demodulates it, and sends it to the TS-Demux 12 as a digital signal. TS-Demux 12 analyzes the input data as a TS multiplexed packet sequence, and extracts video data and audio data of a desired channel and management information necessary for channel viewing. The extracted video data and audio data are sent to the MPEG decoder 13, where the video data and the audio data are respectively decoded and output from the terminals 16 and 17 as a digital video signal and a digital audio signal, respectively. The output video signal and audio signal are output as video and audio on a display device (not shown), and the user can view the program.

  On the other hand, when the selected program is recorded on the HDD, it is sent from the TS-Demux 12 to the Rec / Play Control 29 as a TS stream. In the Rec / Play Control 29, at the time of recording, the desired video data and audio data are subjected to data shaping as a file format that allows file access on the HDD while maintaining the TS data information. The file sent to the ATA-IF 21 is recorded in the HDD drive 22 via the ATA command.

  Also, the video and audio decoded by the MPEG decoder 13 are recorded on the HDD drive through another data path. This path is described below. The digital video signal decoded and output by the MPEG decoder 13 is subjected to resolution conversion for each frame in an HD / SD Down Converter 18 that performs resolution conversion from high resolution to low resolution. The video signal and the audio signal after the resolution conversion are encoded again as MPEG2 Video and Audio bitstreams in the MPEG Encoder 19. Each stream of Video and Audio is packetized and multiplexed as PS data in PS-Mux 20. Further, the management information extracted from TS-Demux 12 is also packetized as PS data and output as data. These data are transmitted to the ATA-IF 21 and recorded on the HDD in a time-sharing manner with the TS data described above. The PS data is in a data format that does not cause resolution conversion or multiplexing format conversion when copied to a DVD-RAM later. Similarly, the management information is previously converted into a data format to be conformed when recording in the DVD-RAM. By treating TS data and PS data as files compliant with a format such as UDF (Universal Disc Format), both are simultaneously recorded and managed on the HDD as separate files. At the time when the recording of the program ends, there are a file containing TS data and a file containing PS data for the same program content.

  FIG. 2 shows an outline of file contents recorded in the HDD. With respect to the received program, the video data and audio data are stored in the TS format as the files for each program as 101, 102, 103, and the management information 100 stores the respective recording time, program information, and the like. On the other hand, the PS data recorded for transfer to the DVD medium is stored so as to correspond to the original TS data as indicated by 201, 202, and 203. In the PS data management information of 200, each recorded content is stored. Managed. In this embodiment, TS and PS data are stored as separate files for each program. However, as a file structure, all programs may be processed as one file in each TS data and PS data as a separate structure. . Conversely, one program may be divided into a plurality of files for processing.

  Next, a case where data recorded on the HDD is moved to the DVD-RAM will be described. When moving program data recorded on the HDD to the DVD-RAM, first, the Copy Control 23 reads the program data from the HDD Drive 22 and writes it to the DVD-RAM via the ATAPI-IF 24. The data read at this time is PS data on the HDD. As described above, since it is recorded in advance in a format that should comply with the recording on the DVD-RAM, it can be copied to the DVD-RAM only by simple data transfer. Here, a case where the data reading speed from the HDD is about 264.4 Mbps and PS data compressed to about 6 Mbps is read is considered. Reading at 6 Mbps is equivalent to reading for normal viewers to view. If this is set to 1 × speed, the HDD has a read speed of 266.4 Mbps / 6 Mbps = 44 × speed. . In the case of a RAM that can be written at about 22.16 Mbps, writing at 22.16 / 6 Mbps = 3.69 times speed is possible. Therefore, 3.69 times speed movement from the HDD to the DVD-RAM becomes possible with the throughput on the DVD-RAM side having a low access speed as a limit value among the reading speed of the HDD and the writing speed to the DVD-RAM. At the time of this data transfer, resolution conversion, multiplexing method conversion from TS data to PS data, etc. are eliminated, so that high-speed movement up to the limit value of the data access speed can be performed. The HDD has two TS and PS data redundantly, but when actually recording a program, it is necessary to receive a broadcast bit rate of about 1 × speed, so at the same time from TS to PS. In this configuration that performs the conversion and the resolution conversion, it is not necessary for the user to be aware of the time for conversion, and high-speed movement processing can be performed when necessary.

The operation when reproducing from the HDD and DVD-RAM will be described. In the HDD, there are high-resolution TS recording and low-resolution PS recording. In general, since the image quality is better at the high resolution, the recorded program is reproduced when the Rec / Play Control 29 selects and reads only the TS data from the HDD Drive 22 and supplies it to the MPEG Decoder 13 during reproduction from the HDD. Some digital broadcasts have a copy protection function restricted to protect the copyright of the content. For example, in the default of copy protection called CPRM (Content Protection for Recordable Media) , content recorded on the HDD can be moved to another recording medium only once, and at the time of movement, it was originally in the HDD . Content needs to be deleted. Further, when recording the received program, HDD, it has been prohibited from having the replication of two or more viewable streams in the media, such as DVD. Accordingly, the two streams TS and PS in the present embodiment should not be disclosed in a state where both are recorded on the HDD and can be viewed by the user. In order to comply with this restriction, the recording / playback controller in the present embodiment has a function of selecting and playing back either TS or PS content. For example, the selection screen is provided to the user through the GUI , and either the TS screen or the PS screen is selected for viewing. In addition, after recording, during normal times, priority is given to viewing a high-quality stream, and only TS can be played back. Alternatively, if you select the user to move from HDD to DVD-RAM is, then the image quality of the DVD-RAM equivalent assumes that the user has confirmed the intention to watch, only the data to be recorded to DVD-R AM playback Select and play only PS so that it is possible. In addition, when editing the contents to be recorded from the HDD to the DVD in the form of a playlist editing screen, for example, only the PS image can be reproduced at the stage of starting editing. As a result, the content to be recorded on the DVD can be directly edited, and the PS data amount and the image of each frame can be disclosed to the user. The movement of the digital data is confirmed in the above manner, and when the data is moved from the HDD to the DVD-RAM, the TS recorded stream is deleted. In this way, it is possible to realize an apparatus in which TS / PS can be recorded at the same time, and high-speed copying can be performed later, while keeping restrictions on duplication prohibition even for contents on which duplication prohibition is imposed. The PS data recorded on the HDD and the PS data recorded on the DVD are both subjected to PS data packet demultiplexing by the PS-Demux 26 at the time of reproduction, and the MPEG decoder 27 decodes the SD data stream and audio. Output as data. Regarding the video, the SD size data is upconverted to the HD size in the SD / HD Up Converter 28. The video signal and the audio signal are respectively output to an external display via a Video Selector 14 (V-Sel in the figure) and an Audio Selector 15 (A-Sel in the figure).

In the present embodiment, the DVD-RAM has been described as the second recording medium, but it goes without saying that the same effect can be obtained even if the second medium is a DVD-R , a DVD-RW, or the like. In addition, as a decoding path, a plurality of MPEG decoders are provided for TS and PS, but a common decoder may be used.

DESCRIPTION OF SYMBOLS 10 ... Input terminal, 11 ... Tuner12 ... TS-Demux13 ... MPEG Decoder14 ... Video Selector15 ... Audio Selector16 ... Video output terminal 17 ... Audio output terminal 18 ... HD / SD Down Converter19 ... MPEG Encoder20 ... PSADiV22 ... ATADIF22 ... 23 Copy Control24 ... ATAPI IF25 ... DVD-RAM Drive26 ... PS-Demux27 ... MPEG Decoder28 ... SD / HD Up Converter29 ... Rec / Play Control

Claims (8)

A method for recording and reproducing digital data of a digital television broadcast,
Recording the digital data on a first medium as first data of a first encoding scheme, and further recording the digital data on the first medium as second data of a second encoding scheme;
When copying of recorded digital data is prohibited,
When the reproduction instruction by user is made reproduces only the first data from the first medium,
When moving instruction by user is performed, and wherein the second data moves from the first medium to the second medium, erasing the first data from the first medium Method for recording and reproducing digital data. The digital data recording / reproducing method according to claim 1,
The method of recording and reproducing digital data, wherein the second data is obtained by converting the first data of the first encoding method into the second encoding method. A method for recording and reproducing digital data of a digital television broadcast,
Recording the digital data as first data of a first multiplexing method on a first medium, and further recording the digital data as second data of a second multiplexing method on the first medium;
When copying of recorded digital data is prohibited,
When the reproduction instruction by user is made, only it can be reproduced the first data from the first medium,
When moving instruction by user is performed, and wherein the second data moves from the first medium to the second medium, erasing the first data from the first medium Method for recording and reproducing digital data. The digital data recording / reproducing method according to claim 3,
The method of recording and reproducing digital data, wherein the second data is obtained by converting the first data of the first multiplexing method into the second multiplexing method. An apparatus for recording and reproducing digital data of digital television broadcasting,
A first recording unit for recording the digital data on a first medium as first data of a first encoding method;
A second recording unit for recording the digital data on the first medium as second data of a second encoding method;
A transfer unit that transfers the second data from the first medium to the second medium;
A control unit,
In the case where copying of the recorded digital data is prohibited, the control unit
When the reproduction instruction by user is made, only it can be reproduced the first data from the first medium,
When moving instruction by user is made, the said second data by the transfer unit to move by transfer from a first medium to a second medium, the first the data of the first A digital data recording / reproducing apparatus for erasing from a medium. The digital data recording / reproducing apparatus according to claim 5,
Further comprising a converter for converting the first data of the first encoding format to the second data of the second coding method, recording the output from those said conversion unit to said first medium A digital data recording / reproducing apparatus. An apparatus for recording and reproducing digital data of digital television broadcasting,
A first recording unit for recording the digital data on a first medium as first data of a first multiplexing method;
A second recording unit for recording the digital data on the first medium as second data of a second multiplexing method;
A transfer unit that transfers the second data from the first medium to the second medium;
A control unit,
In the case where copying of the recorded digital data is prohibited, the control unit
When the reproduction instruction by user is made, only it can be reproduced the first data from the first medium,
When moving instruction by user is made, the said second data by the transfer unit to move by transfer from a first medium to a second medium, the first the data of the first A digital data recording / reproducing apparatus for erasing from a medium. The digital data recording / reproducing apparatus according to claim 7,
Further comprising a converter for converting the first data of the first multiplexing scheme to a second data of the second multiplexing scheme, record the output from those said conversion unit to said first medium A digital data recording / reproducing apparatus.

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