JP2006121248A - Digital recording/reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital recording/reproducing apparatus for down-converting video data, recording the resulting video data to a recording medium in the case of recording digital multiplex video data resulting from multiplexing sub data related to the video data (text data, still picture data, music data, and PC data or the like) onto the video data to the recording medium and down-converting the video data when the video data are copy inhibition video data and thereafter deleting only the original video data, and not deleting the sub data. <P>SOLUTION: The digital multiplex video data resulting from multiplexing the sub data on the video data are once temporarily recorded on a recording medium, the digital multiplex video data are reproduced from the recording medium, and the sub data and the video data are separated. The video data are sequentially down-converted, the converted video data are again multiplexed on the separated sub code and the resulting data are recorded onto the recording medium. In the case of the video data whose copy is inhibited, after the operations above, only the video data being a source of re-encoding are deleted and only the sub data are left. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital recording / reproducing apparatus for recording and reproducing digital multiplexed video data composed of compressed video data such as MPEG and sub-data related to the video data on a recording medium such as a hard disk or an optical disk.

In recent years, with the advancement of video data processing technology, a recording / reproducing apparatus for recording and reproducing a digital signal such as a video signal or an audio signal on, for example, a hard disk or an optical disk has been developed. Since video data has a large amount of information, when video data is recorded on a disk-shaped recording medium as described above, video data is compressed and encoded.
As a method for compressing and encoding video data, for example, an encoding method such as MPEG is known.

  When video data is recorded on a hard disk, an optical disk, or the like by using these compression encoding methods, it is possible to perform efficient recording suitable for a user request by recording at a compression rate or bit rate normally selected by the user. it can.

  On the other hand, television broadcasting has been commercialized in the form of digital television broadcasting capable of transmitting higher-quality video and higher-quality sound than conventional analog television broadcasting signals. Digital TV broadcasting has a large number of transmission channels and a high data transmission amount of 25 Mbps. In addition to video data, sub-data is expected to be multiplexed and distributed on video signals. As the sub data, various data such as an information signal, a still image, an audio signal, a game, a personal computer program, and homepage data related to the video data (program) can be distributed.

Currently, most television receivers receive and display video data, but personal computer televisions that are a combination of a personal computer and a television receiver are becoming widespread.
In the personal computer television, the sub-data can be effectively used, and it is a field expected in the future together with the sub-data multiplex distribution.

  However, since sub data and video data are multiplexed and distributed, it is difficult to handle each data independently. For example, operations such as re-encoding video data to reduce the amount of information, operations for cutting out sub-data independently and taking them out, or operations such as partial modification or deletion depending on the date of sub-data have been impossible.

  In addition, there exists patent document 1 as a patent document of a prior art.

JP 7-75050 A

  In view of the above problems, the present invention is directed to re-encoding processing of video data, partial modification of the sub data, data movement of the video data, data, and the like for digital multiplexed video data in which sub data and video data are multiplexed An object of the present invention is to provide a digital recording / reproducing apparatus that realizes copying.

  In order to solve the above-described problems, the present invention provides a digital recording apparatus for recording digital multiplexed video data, in which video data and sub-data related to the video data are multiplexed, on a recording medium, and inputting the digital multiplexed video data Means for separating the digital multiplexed video data into sub-data and video data, means for recording the video data on a recording medium, and the sub-data in association with the video data on the recording medium. Were provided with recording control means for recording independently.

  Means for reproducing the digital multiplexed video data from a recording medium; means for separating the digital multiplexed video data into sub-data and video data; and down-rate means for reducing the amount of video data per unit time of the video data And recording means for recording the down-graded video data on a recording medium and recording the sub-data in association with the down-rated video data on the recording medium independently of the video data.

  Means for reproducing from the digital multiplexed video data recording medium; means for separating the digital multiplexed video data into sub-data and video data; and down-rate means for reducing the amount of video data per unit time of the video data; And a data multiplexing means for re-multiplexing the sub-data on the down-rate video data, and a means for recording the re-multiplexed digital multiplexed video data on the recording medium.

  Also, means for reproducing the digital multiplexed video data from the first recording medium, means for separating the digital multiplexed video data into sub-data and video data, and reducing the amount of video data per unit time of the video data Down-rate means, means for recording the down-rated video data on a second recording medium, and the sub-data in association with the down-rated video data on the first recording medium and the second recording medium Means for recording, means for detecting completion of recording of the subcode data on the first recording medium, and means for erasing the digital multiplexed video data from the first recording medium in response to the detecting means.

  Also, means for reproducing the digital multiplexed video data from the first recording medium, means for separating the digital multiplexed video data into sub-data and video data, and recording the separated video data on the second recording medium Means for recording the sub-data in association with the down-graded video data on the first recording medium and the second recording medium, and recording the sub-code data on the first recording medium. Means for detecting and means for erasing the digital multiplexed video data from the first recording medium according to the detecting means are provided.

  A means for inputting the digital multiplexed video data; a means for separating the digital multiplexed video data into sub data and video data; a means for recording the video data on a recording medium; and the sub data associated with the video data. Recording control means for recording data on a recording medium independently of the video data, means for detecting sub data information from the sub data, and control for partially changing the sub data in accordance with the information detection result Provided with means.

The sub data information is time data indicating automatic data erasure of the sub data, and includes data erasure control means for automatically erasing the sub data according to the time data.
The sub-data information is time data for partially modifying the data of the sub-data, and includes data modification control means for partially modifying the sub-data according to the time data.

  Digital multiplexed video data in which video data and sub-data related to the video data on the time axis are multiplexed can be independently recorded on a recording medium.

  Embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a recording / reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, an input terminal 1 is a digital video signal input terminal. The signal input to the input terminal is video data and sub-data related to the video data (for example, text data, still image data, audio data, personal computer program data, HTML data describing a homepage such as the Internet, etc.) Is multiplexed digital terrestrial television data or broadband high-speed data.

The digital multiplexed video data will be described with reference to FIGS.
FIG. 7 is a diagram illustrating an example of a stream distribution form of digital multiplexed video data. In terrestrial digital broadcasting, digital video is transmitted using a carrier wave in the current UHF broadcasting frequency band. The UHF broadcast frequency band has a transmission band of 6 MHz, and video data of about 25 Mbps can be carried in this band.

  For example, if the image quality is the same as that of the current analog broadcast (SDTV), it is about 6 Mbps, and the sub-data can be transferred to the remaining 19 Mbps of the full data band. Depending on the type of sub-data, a large amount of information can be conveyed as text data, still image data, audio data, etc., which require a relatively small amount of data. Even program data such as a personal computer has a sufficient transmission band. Further, as a method of carrying sub data exclusively, it is also possible to carry sub data over the entire band (up to 25 Mbps) by distributing the sub data for the entire video data carrying band. In this case, there are many cases where most of the program data is a personal computer.

  In this embodiment, the operation will be described by taking as an example the transmission of sub data related to video data in real time, which is the most utilized, but the above sub data may be used. FIG. 7 shows two data transfer modes. The transport mode (A) is a mode in which video data is divided into predetermined data sizes (packets), sub-data is divided and added for each packet, and transported.

  The sub-data handled in this embodiment is, for example, information related to the video while watching the video in real time, for example, baseball player profile data (still image, text data, etc.) When linked to video and automatically displayed on the screen, or linked to a cooking program to display progress information as text, and address links to the website of the store that actually handles the food Etc. The present embodiment is characterized in that the sub-data is displayed and operated by linking to the progress time of the video.

  Therefore, the link is facilitated by multiplexing the related sub-data in the form shown in FIG. 7A for each predetermined packet size.

  Further, the data transport form shown in (2) of FIG. 7 is a form in which sub-data is added to a plurality of video packets. When the sub-data has a relatively small amount of data such as text data and still image data, it is efficient to add the sub-data collectively to the video data corresponding to the related video scene. Any distribution method may be used, and it is not necessary to add sub-data equally to the video data packet as shown in FIG. However, since the sub data is used in association with the video data, the sub data may be multiplexed before the time axis of the video data.

  Next, an example of a link between video data and the sub data will be described with reference to FIG. FIG. 8 shows a link structure of sub data with respect to video data. Video data is displayed in blocks called video scenes. The video scene is different for each program, and this is managed on the time axis T1 to Tn. If the time of T2 is selected, the video can be moved to the scene 2. On the other hand, the sub data is called up and displayed in relation to the time axes T1 to Tn. For example, text data is called for video scene 1, still image data is called for video scene 2, PC data is called for scene 3, and audio data is called for scene n.

  In this embodiment, for the sake of explanation, the video data input unit has been described by taking terrestrial digital television broadcasting as an example. However, the present invention is not limited to this. For example, high-speed data communication such as an optical cable or a coaxial cable is used. The data input unit of this embodiment is also effective in data distribution using lines.

  In the present embodiment, FIG. 1 is used to describe a structure in which digital multiplexed video data in a form in which video data and sub data are multiplexed is recorded on a recording medium (for example, a hard disk or the like) by separating the sub data and video data. The operation will be described. The digital multiplexed video data is transmitted from the terminal 1 by a plurality of carrier waves. The digital tuner 2 selects a carrier wave desired by the user from a plurality of carrier waves by a channel selection input terminal 3, and performs a so-called television broadcast channel operation.

  When the desired carrier wave is selected, the digital tuner demodulates the digital multiplexed video data signal and inputs it to the data separator 4. The demodulated digital multiplexed video data is, for example, the data arrangement shown in FIGS. 7-1 (A) and (B). The video data is divided into packets of a predetermined length (video data 1-1), ( Video data 1-2), (video data 1-n), and sub-data related to the video data (SUB1-1), (SUB1-2), and (SUB1-n) are respectively woven (A) Or, for a block of (video data 1-1), (video data 1-2), (video data 1-3), and (video data 1-n) in which a plurality of video data of packets of a predetermined length are continuous. The folding form (B) and the like are input to the data separation unit 4 in a form in which the sub data (SUB1) linked to each other are collected.

  In the video data and sub data, attribute data indicating respective attributes (not shown) is added to the top of the data, and the data separation unit discriminates the attribute data, and the video data and the SUB data are To separate. Further, data (SUBLINK data) indicating the link destination of the sub data cited by the video data is generated and input to the time division recording unit. The time division recording unit records the three data on the hard disk in an independent form. Since recording on a recording medium such as a hard disk can only record one channel at a time (WR1), when recording a plurality of data at a time, each data is recorded in a time division manner.

  Here, the recording capacity of the hard disk has a capacity of, for example, 40 MB / second per unit time (data rate), and the data to be recorded is, for example, a data rate of 9.8 Mbps and a data rate of sub data, respectively. If the total data rate of 8 Mbps and SUBLINK data is 0.8 Mbps and the data rate is less than the recording data rate capability of the hard disk, a plurality of data can be recorded in parallel. On the hard disk 6, SUBLINK data, video data, and SUB data are recorded independently (as independent files).

  Next, the reproduction operation will be described with reference to FIG. An instruction to select content (program) that the user wants to reproduce is input to the reproduction control unit 101 from the input terminal 102. In the reproduction control unit, the reproduction control unit 101 causes the time division reproduction unit 7 to start reading out the SUBLINK data corresponding to the content. The read SUB data is input to the Sub data control unit 10. The Sub data control unit 10 determines the necessity of video data and Sub data, which are all data related to the content, and inputs an instruction to read the video data and Sub data to the reproduction control unit 101.

  The playback control unit 101 causes the time division playback unit 7 to start reading video data and Sub data from the hard disk 6. The video data is input to the video decoding unit 8, decoded into the original video signal, and output from the terminal 100. On the other hand, video data is input to the time information extraction unit 9 in order to extract time information from the video decoding unit 8. The time information extraction unit 9 detects time data (time code) for the video data. The time code is added corresponding to each frame of the video.

  Since the sub data often has a smaller data capacity than the video data, the sub data is read out collectively to the Sub data cache unit, and the data is accumulated. This is because when sub-data with a small data size is sequentially read out to the hard disk corresponding to the video data, the hard-disk SEEK operation during the time-division playback of the hard disk is frequently performed, and the data is read out. This is to reduce the decrease in performance.

The accumulated Sub data is output to each sub data decoding unit in real time corresponding to the reproduction of the video data.
SubLink data is detected by the Sub data control unit 10 in accordance with the passage of time of the time code, and when the video time indicated by the SubLink data is detected, the video data is transmitted to the Sub data cache unit. An instruction to output Sub data corresponding to the data is issued.

  If the Sub data is still image data, the still image data is decoded by the still image decoding unit 12 and the original still image data is output from the terminal 16. This still image may be displayed on the same monitor (not shown) screen as the video signal, or may be displayed on an independent monitor screen.

  If the Sub data is text data, the text data is decoded by the text decoding unit 13 and the original text data is output from the terminal 17. This text (character information) may be displayed on the same monitor (not shown) screen as the video signal, or may be displayed on an independent monitor screen.

  If the Sub data is audio data, the audio decoding unit 14 decodes the audio data, and the original audio data is output from the terminal 17. This audio data is sub audio data related to the video data, and includes, for example, a reading voice of the text data. The decoded audio signal is output from the output terminal 18.

  If the Sub data is PC program data, the PC program decoding unit 15 performs decoding processing and outputs the data from the terminal 19. The terminal 19 is a personal computer interface, such as a LAN terminal or a USB terminal, and is connected to the personal computer. The sub data may be other than those described in the present embodiment, and is not limited to the sub data.

  As described above, according to the present embodiment, digital multiplexed video data in which video data and sub-data related to the video data on the time axis are multiplexed can be independently recorded on the recording medium. By recording independently, sub-data can be utilized independently. Even in the case of independent recording, the video data and sub-data can be output in real time by adopting a configuration in which the video data can be linked with the time axis.

Next, the operation of the second embodiment will be described with reference to FIG.
FIG. 2 is a diagram showing a recording / reproducing apparatus according to the second embodiment of the present invention. In FIG. 2, the description of the operation of the same functional blocks as those in FIG.
The data rate of the video data is determined by the distribution side. However, the recording media in the digital recording / reproducing apparatus are limited, and efficient recording is desired. More specifically, although the video data is distributed at a data rate of 9.8 Mbps, there is a case where the user does not want high image quality and wants to record for a long time. The user may desire to record by down-converting the video data by half.

  Conventionally, in the case of distributing only video data, the data rate of the video data has been halved by directly interposing down-conversion. However, if the sub-data is multiplexed as described above, it is directly down-converted. I can't. Therefore, in this embodiment, the digital multiplexed video data is down-converted (re-encoding process) on the video data after being separated into video data and sub-data. The operation will be described below with reference to FIG.

  The video data separated by the data separation unit 4 is input to the re-encoding unit 22. The user designates a desired down-convert level from the input terminal 20 and inputs it to the encode parameter setting control unit 21. The encoding parameter setting control unit 21 inputs the angle-of-view size, the video compression rate, the motion vector redundant data, and the like, which are down-converted parameters, to the re-encoding unit 22. The re-encoding unit 22 performs down-rate processing on sequentially input video data, and inputs the video data to the time division recording unit 5 as re-compressed video data. The following operations are the same as those in the first embodiment.

  As described above, according to the present embodiment, even with digital multiplexed video data in which sub-data is multiplexed, the video data can be down-rate processed and can be efficiently recorded on the hard disk. Furthermore, the effect that the sub-data can be linked and reproduced also for the down-rate video data is great.

Next, the operation of the third embodiment will be described with reference to FIG.
FIG. 3 shows a recording / reproducing apparatus according to the third embodiment of the present invention. In FIG. 3, description of the operation of the same functional blocks as those in FIGS. 1 and 2 is omitted.
In this embodiment, after digital-multiplexed video data in which sub-data is multiplexed is down-rate converted with respect to the video data, the sub-data is again multiplexed with the down-rate processed video data. (Down-rate) digital multiplex video data is recorded on a recording medium.

In the above embodiment, the sub data and the video data are recorded on the hard disk in an independent form, but in this embodiment, the recording is performed in the same form as the distribution side.
The data separating unit 4 divides the video data and the SUB data into SUBLINK data linked to the sub data on the time axis and inputs the divided data to the video data Sub data multiplexing unit 31. As the video data, down-recompressed video data desired by the user is input to the video data sub data multiplexing unit 31.

  The video data Sub data multiplexing unit 31 detects the link instruction of the SUB data corresponding to the real time axis of the recompressed data based on the SubLink data by the SubLink control unit, and divides the recompressed video data every predetermined length ( Packet), the sub data is multiplexed on the divided packet data, and one line of data is input to the recording control unit 5. The recording control unit 5 records the one line of data on the hard disk 6 as (WR1).

  FIG. 3A shows a data structure of down-multiplexed digital multiplexed video data according to the present embodiment. The original data string indicates a data string to be distributed. In the down rate data sequence, sub data (SUB1-1, SUB1-2) is the same data as the original, and only video data (video data 1-1, video data 1-2) is compressed on the time axis. It is the state that was done.

  In order to reduce the fluctuation of the link time for the sub-data video data due to the real-time compression of the video data, in this embodiment, the packet size of the down-graded video data is reduced compared to the original. The packet length is set so as to change (decrease) corresponding to the down rate ratio. By doing so, it is possible to reduce the link time of the sub data due to the down rate of the video data.

  As described above, according to this embodiment, the video data of the digital multiplex video signal can be down-rate converted as desired by the user, and the form of data to be recorded can be recorded on the recording medium as the digital multiplex video data. The effect that the hard disk can be used efficiently is great.

Next, the operation of the fourth embodiment will be described with reference to FIG.
FIG. 4 shows a recording / reproducing apparatus according to the fourth embodiment of the present invention. In FIG. 4, description of the operation of the same functional blocks as those in FIGS. 1 and 2 is omitted.
The present embodiment is applied when the video data to be distributed is copy-prohibited, down-converts the video data recorded on the hard disk, and the converted video data is removed as a removable recording medium. The operation will be described by taking the case of recording on (optical disc) as an example.

  The video data reproduced by the time division reproduction unit 7 is video data having the same data rate as that of the distribution side. The re-encoding unit 22 performs down-rate conversion processing on the video data to the data rate desired by the user, and the down-converted video data is input to the optical disk recording unit 40. In this embodiment, an optical disk will be described as an example of a removable recording medium. However, the present embodiment is similarly applied to a case where the down-converted video data is recorded on a recording medium different from the hard disk 6. .

  The recordable optical disk 41 sequentially records video data by the optical disk recording unit. The optical disk recording unit 40 performs continuous recording for each video data having a size of re-encoded video data corresponding to the video data corresponding to the packet length of the video data, and then reproduces the recorded video data. A verification operation is performed by the optical disk reproducing unit 43.

  The read video data of the predetermined size is compared (compared) with the input data from the re-encoding unit 22 by the data comparison unit 42 with the recorded video data. Through the verify operation and the compare operation, it is ensured that the video data is reliably recorded. When the data comparison unit 42 detects that video data of a predetermined size has been reliably recorded on the optical disc, a video data recording completion signal of the predetermined size is input to the data erasure unit 110.

  When the data erasure control unit 110 detects the recording completion signal, the data erasure control unit 110 erases from the hard disk 6 the original video data corresponding to the real time of the video data re-encoded and recorded on the optical disc. By the above operation, the original video data can be down-converted and the video data can be moved to the optical disc. Since the SUBLINK data and SUB data remain in the hard disk 6, it can be used continuously, for example, when the SUB data is PC program data.

Furthermore, in this embodiment, the operation has been described for the case of down-rate conversion. However, original video data may be recorded on the optical disc without down-rate conversion. FIG. 5 shows a block diagram of the configuration.
The configuration is the same as that shown in FIG. 4, and the video data is recorded on the optical disc 41 without being re-encoded.

  According to the above embodiment, when video data is copy-prohibited, the video data or the down-rate converted video data is recorded on the removable recording medium or another recording medium different from the hard disk 6 and the recording is performed. It is possible to perform a so-called video data move that erases the original video data portion corresponding to the portion from the hard disk 6.

  Furthermore, since the SUB data related to the video data remains in the hard disk 6, it can be output by quoting the SUB data from the SubLink data. Furthermore, when the SUB data is PC program data, the effect that the SUB data can be utilized from the terminal 19 by a personal computer is great.

Next, the operation of the fifth embodiment will be described with reference to FIG.
FIG. 6 shows a recording / reproducing apparatus according to the fifth embodiment of the present invention. In FIG. 6, the description of the operation of the same functional blocks as those in FIGS. 1 and 2 is omitted.
In this embodiment, it is possible to limit the output or the function with the passage of time of the sub data linked to the video data. A specific example will be described.

  The sub data is the same as the video data and is charged free of charge or included in the video data. However, in the case where the sub data is commercial, when the commercial information is recorded, the still data, text data, and other sub data are output regardless of the time limit. Although it is convenient for the commercial distribution maker, it is not convenient for another commercial maker.

  In another specific example, when the sub data is program data of a personal computer or the like, there is a case where the function restriction is controlled with the passage of time for the purpose of expanding sales of the personal computer program. Alternatively, some functions may be restricted due to the passage of time. Alternatively, there is a case where the entire program cannot be read due to the passage of time.

  The terminal 19 of this embodiment is used by being connected to a personal computer, but the Sub data unit 10 operates so as to restrict program transfer to the personal computer. At least, the externally connected personal computer is the hard disk 6. The PC program decoding unit 15 is limited to access the PC data of the sub data.

  In order to realize the above functions, in the present embodiment, when the expiration date information is recorded in the SUB data, the Sub data control block 10 reads the effective date and time of the SUB data from the SubLin data. On the other hand, the absolute date and time is input from the clock data generation unit 103 to the Sub data control unit, and is compared with the valid date and time. As a result of the comparison, if the valid date / time of the SUB data has passed, the Sub control unit 10 decodes the Sub data decoding block (the code unit 12 in the still image, TXT for each valid date / time detection corresponding to each sub data. A use function restriction (here, sub data output is stopped) signal (INHIBIT) is input for each of the decoding unit 13, the audio decoding unit 14, and the PC program decoding unit.

  By doing so, the decoding unit to which the INHIBIT signal is input does not output sub data to the output terminal. In this embodiment, the sub data output is stopped every time the valid date of sub data is detected. However, for example, the sub data in the hard disk 6 may be deleted. Alternatively, part of the sub data in the hard disk 6 may be modified.

  As described above, according to this embodiment, output of sub-data related to video data is stopped according to the output restriction of the sub-data recorded on the hard disk, for example, according to the date and time information of the sub-data included in the sub-data. Alternatively, by restricting the partial function of the sub data, there is an effect that the performance of commercial use on the side where the sub data is distributed can be expanded.

1 is a block diagram showing a recording / reproducing apparatus according to a first embodiment of the present invention. The block diagram which shows the recording / reproducing apparatus of the 2nd Embodiment of this invention. The block diagram which shows the recording / reproducing apparatus of the 3rd Embodiment of this invention. The block diagram which shows the recording / reproducing apparatus of the 4th Embodiment of this invention. The block diagram which shows the recording / reproducing apparatus of the modification of the 4th Embodiment of this invention. The block diagram which shows the recording / reproducing apparatus of the 5th Embodiment of this invention. The figure which shows an example of the stream delivery form of digital multiplex video data. The figure which shows an example of the link of video data and this sub data.

Explanation of symbols

2 ... Digital tuner section 3 ... Channel selection input terminal,
4 ... Data separation unit, 6 ... Hard disk, 7 ... Time division playback unit,
8 ... Video decoding unit, 9 ... Time information extraction unit, 10 ... Sub data control unit,
12 ... Still picture decoding unit, 13 ... Text decoding unit,
14 ... Audio decoding unit, 21 ... Encoding parameter setting control unit,
22 ... Re-encoding unit, 31 ... Sub data multiplexing unit, 40 ... Optical disk recording unit,
41 ... Recording type optical disk, 42 ... data comparison unit, 43 ... optical disk reproduction unit,
67 ... Content selection / erasure control unit, 101 ... Playback control unit,
103: Clock data generating unit 110: Data erasing unit

Claims (8)

A digital recording apparatus for recording digital multiplexed video data, in which input video data and sub-data related to the video data are multiplexed, on a recording medium,
Means for inputting the digital multiplexed video data;
Means for separating the digital multiplexed video data into sub-data and video data;
Means for recording the video data on a recording medium;
A digital recording / reproducing apparatus comprising recording control means for recording the sub-data in association with the video data on a recording medium independently of the video data. A digital recording apparatus for recording digital multiplexed video data, in which input video data and sub-data related to the video data are multiplexed, on a recording medium,
Means for reproducing the digital multiplexed video data from a recording medium;
Means for separating the digital multiplexed video data into sub-data and video data;
Down rate means for reducing the amount of video data per unit time of the video data, means for recording the down rate video data on a recording medium,
A digital recording / reproducing apparatus comprising: recording control means for recording the sub-data on a recording medium independently of the video data in association with the down-rated video data. A digital recording apparatus for recording digital multiplexed video data in which video data and sub-data related to the video data are multiplexed on a recording medium,
Means for reproducing from the digital multiple video data recording medium;
Means for separating the digital multiplexed video data into sub-data and video data;
Down rate means for reducing the amount of video data per unit time of the video data; data multiplexing means for re-multiplexing the sub-data on the down-rate video data;
Means for recording the re-multiplexed digital multiplexed video data on the recording medium. A digital recording apparatus for recording digital multiplexed video data, in which video data and sub-data related to the video data are multiplexed, on a first recording medium,
Means for reproducing the digital multiplexed video data from a first recording medium;
Means for separating the digital multiplexed video data into sub-data and video data;
Down-rate means for reducing the amount of video data per unit time of the video data; means for recording the down-rated video data on a second recording medium;
Means for recording the sub-data in association with the down-rated video data on the first recording medium and the second recording medium;
Digital recording comprising: means for detecting completion of recording of the subcode data on the first recording medium; and means for erasing digital multiplexed video data from the first recording medium in response to the detecting means Playback device. A digital recording apparatus for recording digital multiplexed video data, in which video data and sub-data related to the video data are multiplexed, on a first recording medium,
Means for reproducing the digital multiplexed video data from a first recording medium;
Means for separating the digital multiplexed video data into sub-data and video data;
Means for recording the separated video data on a second recording medium;
Means for recording the sub-data in association with the video data on the first recording medium and the second recording medium;
Means for detecting completion of recording of the subcode data on the first recording medium;
A digital recording / reproducing apparatus comprising: means for erasing digital multiplexed video data from the first recording medium in accordance with the detecting means. A digital recording apparatus for recording digital multiplexed video data, in which input video data and sub-data related to the video data are multiplexed, on a recording medium,
Means for inputting the digital multiplexed video data;
Means for separating the digital multiplexed video data into sub-data and video data;
Means for recording the video data on a recording medium;
Recording control means for recording the sub-data in association with the video data on a recording medium independently of the video data;
Means for detecting subdata information from the subdata;
A digital recording / reproducing apparatus comprising: control means for partially changing the sub-data according to the information detection result. The digital recording / reproducing apparatus according to claim 6.
The sub-data information is time data indicating automatic data erasure of the sub-data, and comprises a data erasure control means for automatically erasing the sub-data in accordance with the time data. . The digital recording / reproducing apparatus according to claim 6.
The sub-data information is time data for partially modifying the data of the sub-data, and comprises digital modification control means for partially modifying the sub-data in accordance with the time data. Playback device.

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