JP3816196B2 - Recording / playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to signal transmission / reception technology and recording / reproduction technology between devices, and in particular, receives digital information signals such as movies and programs transmitted by coaxial, optical cable, telephone line, and transmission means such as satellite broadcasting. The present invention relates to a recording / reproducing apparatus suitable for use in a digital video system or the like for transmitting / receiving the received digital information signal between apparatuses.
[0002]
[Prior art]
In recent years, digital systems represented by international standards such as so-called MPEG have been adopted as broadcasting and communication forms. In this method, the audio and video signals that make up a program are digitized, then compressed and encoded, packetized in a predetermined format, and multiplex-transmitted. It can be transmitted by time division multiplexing. The MPEG standard also defines multiplex transmission with digital information signals such as program information.
[0003]
Here, when decoding a signal compressed in this way, if the decoding speed is faster than the transmission speed on the signal sending side, data will be insufficient and decoding will not be possible. It is necessary to synchronize between the transmission rate of the transmitted signal and the decoding rate of this signal.
[0004]
For this reason, in the MPEG-2 standard, which has been standardized following the MPEG-1 standard, a time base reference value called “PCR” is added to the packet data. Thus, the decoding clock signal is restored. Therefore, the arrival time of the packet cannot move.
[0005]
On the other hand, a conventional digital signal recording / reproducing method in which an unnecessary program or data is removed from data transmitted by such a digital method and only a desired program is recorded / reproduced in Japanese Patent Application Laid-Open No. 8-297922. And devices have been proposed.
[0006]
In this method and apparatus, as described above, only packets of a desired program are sequentially extracted from a plurality of programs (bitstreams) that are time-division multiplexed and transmitted, and are recorded on a recording medium with a packet interval reduced. However, at the time of this recording, packet arrival time information is added to each packet as a header so that the packet can be reproduced while maintaining the original packet time interval.
[0007]
In reproduction, the packet of the program recorded on the recording medium is reproduced by returning the interval on the time axis of the packet to be actually reproduced based on the packet arrival time.
[0008]
[Problems to be solved by the invention]
However, in this digital signal recording / reproducing method and apparatus, it is necessary to newly add a header including time information to all packets to be recorded in the bit stream. For this reason, there is a problem that complicated circuits and processing such as timing control for adding a header and delay control of recording timing of packets for the header are required. Similarly, at the time of reproduction, complicated circuits and processes are required to restore the decoding clock signal based on this time information and to control the interval of packets to be reproduced. As a result, there is a problem that the circuit scale of the apparatus is large and expensive.
[0009]
The present invention has been made in view of the above-mentioned problems, and can be realized at a low cost with a small circuit scale. It can remove unnecessary programs and data, and record and reproduce only desired programs efficiently and stably. An object of the present invention is to provide a recording / reproducing apparatus capable of improving the recording efficiency of a recording medium.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, a recording / reproducing apparatus according to the present invention Time management information necessary for data reproduction is added at predetermined intervals. Recording data selection means for selecting one or a plurality of desired data to be recorded from among the data packetized together with the header information and time-division multiplexed and transmitted, and the header of each transmitted data Recording coincidence detecting means for detecting coincidence between the information and the header information of the data selected by the recording data selecting means; and if the coincidence of the header information is detected by the recording coincidence detecting means, the corresponding data is When recording on a recording medium without compression, and when the discrepancy between the header information is detected by the recording coincidence detection means , Detecting header information attached to data other than the data selected by the recording data selecting means, and if time management information is not attached to the header information, the corresponding data is compressed and recorded, If time management information is attached to the header information, compress data other than the time management information. Recording means comprising recording control means for recording on a recording medium.
[0011]
Along with this recording means, reproduction data selection means for selecting desired data to be reproduced from the data recorded on the recording medium, header information of each data reproduced from the recording medium, and the reproduction Reproduction match detection means for detecting a match with the header information of the data selected by the data selection means, and when a match between the header information is detected by the reproduction match detection means, the corresponding data is not expanded. And reproduction control means for reproducing and reproducing a portion other than the header information of the corresponding data when the reproduction coincidence detection means detects a mismatch of the header information.
[0012]
The fact that the header information of each transmitted data and the header information of the data selected by the recording data selection means match indicates that the currently received data is data for which recording has been designated. . For this reason, when the coincidence of the header information is detected by the record coincidence detecting unit, the recording control unit records the corresponding data on the recording medium without compressing.
[0013]
Also, the fact that the header information of each transmitted data and the header information of the data selected by the recording data selection means do not match means that the currently received data is data for which recording is not specified. Indicates that there is unnecessary data. For this reason, the recording control means compresses the portion other than the header information of the corresponding data and records it on the recording medium when the discrepancy of the header information is detected by the recording coincidence detecting means.
[0014]
As a result, unnecessary data can be compressed and recorded, so that the recording area of the recording medium occupied by unnecessary data can be minimized and the recording area of the recording medium can be used efficiently. Can do.
[0015]
Even if it is unnecessary data to be compressed, the header information is recorded without being compressed, so that the original bit length data is reproduced using the time information attached to the original header information. can do. For this reason, there is no need to form header information with new time information added to each program data, but to form and record the header information with this new time information added and to record the data with this header information. A complicated processing circuit or the like required for reproduction can be omitted, and the circuit scale of the recording / reproducing apparatus can be reduced and the price can be reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a recording / reproducing apparatus according to the present invention will be described in detail with reference to the drawings.
[0017]
First, the recording / reproducing apparatus according to the present invention can be applied to a video distribution service system using a communication satellite as shown in FIG.
[0018]
The video distribution service system according to the first embodiment of the present invention provides a center device 1 that transmits data such as a movie or a program in response to a user request, etc., and a user who has subscribed to the video distribution service system. And a communication satellite 3 that relays data transmitted from the center device 1 to the terminal device 2.
[0019]
The center device 1 is connected to a software supply center 4 for transmitting data such as movies and programs (hereinafter referred to as program data) and a terminal device 2 on the user side via a telephone line 14, and responds to requests from users. An operation center 5 that controls transmission of the program data, a program distribution center 6 that controls distribution of program data from the software supply center 4 according to control by the operation center 5, and a program whose distribution is controlled by the program distribution center 6. The transmission unit 7 transmits data to the communication satellite 3.
[0020]
Although only one software supply center 4 is shown in FIG. 1, there are actually a plurality of software supply centers, and the user receives supply of program data from each center. ing.
[0021]
The terminal device 2 provided on the user side receives the program data from the center device 1 distributed via the communication satellite 3, and performs data processing of the program data received by the receiving unit 10 to perform television data processing. The terminal main body 8 is supplied to the John receiver 9.
[0022]
The terminal main body 8 decodes the program data received by the telephone / modem 11 which is a telephone and a communication modem connected to the operation center 5 of the center apparatus 1 via the telephone line 14 and the receiving unit 10 and receives a television image. A receiver decoder 12 supplied to the machine 9 and a recording / reproducing unit 13 for recording and reproducing program data decoded by the receiver decoder 12 on a recording medium such as a hard disk or a magneto-optical disk.
[0023]
Although only one terminal device 2 is shown in FIG. 1, there are actually a plurality of subscriber terminal devices.
[0024]
Next, the operation of the video distribution service system of the embodiment having such a configuration will be described.
[0025]
First, the program distribution center 6 provided in the center apparatus 1 has a configuration as shown in FIG. 2 in detail, and program data from the software supply center 4 is received via the input terminal 20. The control data from the operation center 5 is supplied to the program control circuit 23 via the input terminal 21.
[0026]
Program data from the software supply center 4 is supplied using communication means such as an optical fiber, a coaxial cable, or a satellite. In some cases, it may be due to transportation of storage media such as VTR cassettes, optical disks, and magnetic disks.
[0027]
When program data is supplied by the communication means, the reception processing circuit 22 performs processing such as demodulation processing, error correction processing, and bit expansion processing on the program data supplied via the input terminal 20 as necessary. Is supplied to a storage medium 24 having a recording / reproducing function such as a digital video tape recorder (DVTR), an optical disk (including a magneto-optical disk), a magnetic disk, etc. To do.
[0028]
In addition to the program data from the reception processing circuit 22, the changeover switch 25 is read from the transported storage medium 26 when the program data is supplied by transport of the storage medium such as the VTR cassette. Program data is supplied. The changeover switch 25 selects the program data from the reception processing circuit 22 or the program data read from the storage medium 26 according to each case, and supplies this to the bit compression circuit 27.
[0029]
The bit compression circuit 27 compresses and encodes program data in accordance with, for example, the MPEG-2 standard, and reduces the supplied program data to a data amount necessary for transmission. The compressed and encoded program data is supplied to a storage medium 28 having a recording / reproducing function such as a digital video tape recorder (DVTR), an optical disk (including a magneto-optical disk), a magnetic disk, and the like.
[0030]
Note that the bit compression circuit 27 may be omitted when data that has been compression-encoded in advance is supplied from the software supply center 4.
[0031]
On the other hand, when the control data from the operation center 5 is supplied to the program control circuit 23 via the input terminal 21, the program control circuit 23 supplies the control data to the storage media 24 and 28 and the transmission processing circuit 29. .
[0032]
Specifically, if the control data indicates transmission of program data supplied by the communication means, the program control circuit 23 controls reproduction of the storage medium 24. The program data reproduced by the reproduction control of the storage medium 24 is compressed and encoded by the bit compression circuit 30 based on, for example, the MPEG-2 standard, reduced to a data amount necessary for transmission, and supplied to the transmission processing circuit 29. The
[0033]
If the control data indicates transmission of program data read from the transported storage medium 26, the program control circuit 23 controls playback of the storage medium 28. The program data reproduced by the reproduction control of the storage medium 28 is supplied to the transmission processing circuit 29.
[0034]
The transmission processing circuit 29 has a configuration as shown in FIG. 3, and the compressed and encoded program data is supplied to the corresponding encryption circuit 36 via each input terminal 35. The encryption circuit 36 performs a predetermined encryption process on the supplied program data and supplies it to the time division multiplexing circuit 37.
[0035]
When the program data is distributed to the user side, additional information such as viewing right control information and program guide information is added and distributed together with the program data. For this reason, the encryption processing may be performed on the attached information.
[0036]
The time division multiplexing circuit 37 compresses each program data in the time axis direction by packetizing each program data into a predetermined format. Then, by selecting each compressed program data with the selection data supplied from the program control circuit 23 via the input terminal 41, the respective program data is multiplexed and supplied to the error correction code adding circuit 38. .
[0037]
The error correction code addition circuit 38 adds an error correction code for correcting a transmission error caused by noise in a satellite line, a CATV line or the like, and supplies this to the modulation circuit 39. The modulation circuit 39 modulates program data for a predetermined channel with a single carrier to form one transmission channel, and supplies this to the transmission unit 7 shown in FIG. The transmission unit 7 distributes the program data to the user terminal device 2 via the communication satellite 3 shown in FIG.
[0038]
When the program data supplied from the software supply center 4 is immediately transmitted, the program data once recorded on the storage medium 24 is not reproduced and output, but is recorded on the storage medium 24 as necessary. The program data supplied to the storage medium 24 may be supplied to the bit compressor circuit 30.
[0039]
In addition, the bit compression circuits 27 and 30 can be omitted by supplying the program distribution center with program data that has been pre-compressed from the software supply center 4.
[0040]
FIG. 2 shows that there are two program data input paths to the transmission processing circuit 29, but this actually means that the storage media 24 and 28, the bit compression circuits 27 and 30 and the transmission processing are performed. A plurality of transmission units including the circuit 29 are provided, and program data can be transmitted through a plurality of transmission channels.
[0041]
Here, as the program distribution center 6, in addition to the configuration shown in FIG. 2, the configuration shown in FIG. 4 can be provided.
[0042]
That is, in the program distribution center 6 shown in FIG. 4, the program data from the software supply center 4 is supplied to the storage medium control unit 47 via the input terminal 45, and the control data from the operation center 5 is supplied via the input terminal 46. Is supplied to the program control circuit 48.
[0043]
The program control circuit 48 controls the storage medium control unit 47 so as to temporarily store the program data in one of the storage media 49 based on the supplied control data, and the program data stored in the storage media 49 Is read out and controlled. The program data read from the storage media 49 is supplied to a bit compression circuit 50 provided corresponding to each storage media 49, and is subjected to compression encoding processing based on the MPEG-2 standard as described above. It is supplied to the transmission processing circuit 51.
[0044]
When the program data is supplied to the transmission processing circuit 51, the program control circuit 48 selects and controls the transmission processing circuit 51 so as to select the program data that has been compression-encoded through the program information generating unit 52. As a result, the program data selected by the transmission processing circuit 51 is supplied to the transmission unit 53 and distributed to the terminal device 2 side of the user via the communication satellite 3 as described above.
[0045]
Next, the program data distributed through the communication satellite 3 in this way is received by the receiving unit 10 provided in the terminal device 2 shown in FIG. 1 and supplied to the receiver decoder 12 in the terminal body 8. .
[0046]
The receiver decoder 12 has the configuration shown in FIG. 5 and is used to know a request signal for requesting delivery of a desired program to the operation center 5 via the telephone / modem 11 and the reception status of pay broadcasting. An input / output terminal 55 for exchanging signals is provided. When the request signal is transmitted to the operation center 5 through the input / output terminal 55, the program data desired by the user is delivered as described above, received by the receiving unit 10, and received through the input terminal 56. 57 is supplied.
[0047]
The tuner 57 selects a transmission channel desired by the user by performing a channel selection operation according to control data from the control circuit 58.
[0048]
Specifically, the selected transmission channel is formed by a total of four program data of program A to program D as shown in FIG. 6A, for example. In general, the transmission rates of the program data of the programs A to D are different from each other, and the data amount varies when viewed instantaneously. In order to efficiently control this, each program data of programs A to D is packetized with header information (packet identifier: PID) at the head, and is time-division multiplexed.
[0049]
As described above, the program data in each packet is encrypted as necessary, and program guide information and viewing rights-related information are also time-division multiplexed in a packet format.
[0050]
When such a transmission channel is selected, the tuner 57 performs a demodulation process corresponding to the modulation process applied to each program data, and supplies this to the error correction circuit 59. The error correction circuit 59 performs error correction such as a transmission error based on the error correction code added to each program data, and supplies this to the interface unit 61 and the selection switch 60.
[0051]
The selection switch 60 is selected and controlled by the control data from the control circuit 58. When restoring the received program data, the selection switch 60 selects the program data from the error correction circuit 59 and from the recording / reproducing unit 13. When restoring the reproduction output of the program, program data from the interface unit 61 is selected and supplied to the program dividing circuit 63, respectively.
[0052]
The program dividing circuit 63 is based on the control data from the control circuit 58 among a plurality of programs time-division multiplexed by the transmission processing circuits 29 and 51 shown in FIG. Selects the program data of the desired program and supplies it to the encryption / decryption circuit 64.
[0053]
The encryption / decryption circuit 64 decrypts the program data encrypted by the encryption circuit 36 (FIG. 3) in the transmission processing circuits 29 and 51 and supplies the decrypted program data to the decryption circuit 65. The decoding circuit 65 performs a bit decompression process corresponding to the bit compression process performed by the bit compression circuits 27, 30, 50 shown in FIGS. 2 and 4 or the software supply center 4 shown in FIG. 1 on the program data. The data is decoded and supplied to the output processing circuit 66.
[0054]
The output processing circuit 66 converts the program data into, for example, an NTSC television format, and supplies it to the television receiver 9 shown in FIG. Thereby, the video of the program distributed from the center apparatus 1 side according to the user's request can be displayed on the television receiver 9.
[0055]
In the receiver decoder 12 shown in FIG. 5, the encryption / decryption circuit 64 is provided in the subsequent stage of the program dividing circuit 63. However, the encryption / decryption circuit 64 is provided in the preceding stage of the program dividing circuit 63. The program division processing may be performed after the program data is encrypted and decrypted.
[0056]
On the other hand, the program data of the transmission channel supplied from the error correction circuit 59 to the interface unit 61 is supplied to the recording / reproducing unit 13 shown in FIG.
[0057]
The recording unit of the recording / reproducing unit 13 has the configuration shown in FIG. 7, and the program data of the transmission channel output through the interface unit 61 and the input / output terminal 62 is packetized through the input terminal 71. The data is supplied to the data compression unit 72 and the packet header detection unit 73.
[0058]
The packet header detection unit 73 detects header information of each packet of each program data of the supplied transmission channel, and supplies a packet identifier (PID) included in this header information to the coincidence detection circuit 76. The PID register 75 stores in advance PIDs such as program guide information and viewing right relation information of the program selected for recording, and the coincidence detection circuit 76 uses the PID stored in advance and a packet header detection unit. The PID extracted at 73 is compared, and this comparison output is supplied to the control circuit 74.
[0059]
The control circuit 74 controls the packet data compression unit 72 not to compress the program data when the comparison output indicating that the two match is supplied. When a comparison output indicating that the two do not match is supplied, the control circuit 74 controls the packet data compression unit 72 to compress the program data.
[0060]
Specifically, as shown in FIG. 6A, when the program B is selected by the user among the programs A to D, the PID of the program B is loaded into the PID register 75. The coincidence detection circuit 76 compares the PID sequentially supplied from the packet header detection unit 73 with the PID loaded in the PID register 75. When the control circuit 74 detects that the PID of the program B matches based on the comparison output, the control circuit 74 controls the packet data compression unit 72 so as not to compress data other than the program header (payload portion). When a comparison output indicating that they do not match is detected, the packet data compression unit 72 is controlled so as to compress data other than the program guide information and viewing right relation information in the program data.
[0061]
As a result, as shown in FIG. 6B, in this case, the data portion (perod) other than the header information of the programs A, C, and D which are unnecessary programs other than the program B desired by the user is shown in FIG. b) The program is compressed as shown by the middle left oblique line, and only the program data of the program B is output without being compressed.
[0062]
The compressed program data or non-compressed program data is supplied to a recording head (not shown) via an output terminal 77 and recorded on a recording medium such as a hard disk, a magneto-optical disk, or a video tape. Thereby, an unnecessary program other than the program B desired by the user can be compressed and recorded to a minimum data amount, and the program data of the program B desired by the user can be recorded on the recording medium without being compressed. For this reason, even when recording program data in which a plurality of programs are multiplexed, the recording area of the recording medium occupied by unnecessary programs can be minimized, and the recording efficiency of the recording medium can be improved. Can be planned.
[0063]
Further, even if the program data is to be compressed, data necessary for reproduction such as program guide information and viewing right relation information is not compressed, and other data is compressed. It is not necessary to form and add new header information including the header, and it is possible to eliminate the complicated circuit required for processing such as addition, recording and reproduction of the new header information, and to reduce the circuit scale. And cost reduction.
[0064]
In this example, only one program to be recorded is designated. However, a plurality of programs may be designated and recorded.
[0065]
Further, in the program data, data other than data necessary for reproduction such as program guide information and viewing right relation information is compressed, but this is necessary for reproduction of program guide information and viewing right relation information and the like. Data indicating null data (all zero data) may be added instead of data other than data. Data indicating this null data is added by setting a flag in a reserved area (reserved area) provided in header information, for example. As a result, the amount of data to be recorded on the recording medium can be reduced in each stage rather than compressing data other than data necessary for reproduction such as program guide information and viewing right relation information (program guide information, viewing right information). The data required for reproduction of relation information and the like and only the flag) and the recording efficiency of the recording medium can be made more remarkable.
[0066]
Next, the reproducing unit of the recording / reproducing unit 13 for reproducing the program data of the transmission channel recorded in this way has a configuration as shown in FIG. 8, and FIG. 6 (b) recorded on the recording medium. The program data of the transmission channel as shown in FIG. 5 is reproduced by a reproduction head (not shown) and supplied to the packet data decompression circuit 82 and the packet header detection circuit 83 via the input terminal 81.
[0067]
The packet header detection circuit 83 detects header information of each supplied program data, and supplies a packet identifier (PID) included in the header information to the coincidence detection circuit 86. The PID register 85 stores in advance PIDs such as program guide information and viewing right relation information of the program selected for reproduction. The coincidence detection circuit 86 includes the PID stored in advance and a packet header detection unit. The PID extracted by 83 is compared, and this comparison output is supplied to the control circuit 84.
[0068]
As described above, the program data recorded by the user's designation is the program B data. Program data other than the program data of program B is compressed. For this reason, the control circuit 84, when supplied with a comparison output indicating that the two match, does not decompress the program data (in this case, program data of program B), the packet data decompression unit 82. To control. When the comparison output indicating that the two do not match is supplied, the control circuit 84 expands the program data (in this case, the program data other than the program B) so as to expand the packet data compression unit 82. To control.
[0069]
Thereby, as shown in FIG.6 (c), all the program data of the transmission channel which consists of each program data of the program A-program D is reproducible. This program data is supplied to the program dividing circuit 63 via the input / output terminal 62, the interface unit 61 and the selection switch shown in FIG. As described above, program data of the program designated by the user (in this case, program data of program B) is extracted by the program dividing circuit 63, and the encryption / decryption circuit 64, the decryption circuit 65, the output processing circuit 66, and the output It is supplied to the television receiver 9 shown in FIG. Thereby, the video of the program (in this case, program B) reproduced by the recording / reproducing unit 13 can be displayed on the television receiver 9.
[0070]
In addition, when the flag which shows that it is null data instead of data other than data required for reproduction | regeneration of program guide information, viewing-rights related information, etc. is set instead of compressing program data, the control circuit 84 is Based on this flag, null data (all 0 data) corresponding to the data amount of the program is formed, and the original data is compensated by the null data. Therefore, even when this flag is set, the bit stream length of the transmission channel before and after compression does not change. In this case, programs other than the program B among the programs to be played are null data and cannot be played back, but since these are programs that the user did not desire to record, there is no problem.
[0071]
As is clear from the above description, in the video distribution service system of the first embodiment, when program data is recorded in the terminal device 2 on the user side, among the program data of the transmission channel, the user The program data of the program designated by the program is recorded as it is, and the program data of the program other than the designated program is compressed and recorded, so that unnecessary data recording among the data constituting the transmission channel is suppressed as much as possible. And the recording efficiency of the recording medium can be improved.
[0072]
Further, even if the program data is to be compressed, data necessary for reproduction such as program guide information and viewing right relation information is not compressed, and other data is compressed. It is not necessary to form and add new header information including the header, and it is possible to eliminate the complicated circuit and processing required for adding and processing this new header information, thereby reducing the circuit scale. In addition, the price can be reduced.
[0073]
Next, the video distribution service system according to the second embodiment of the present invention will be described.
[0074]
In the video distribution service system according to the first embodiment described above, the recording / playback unit 13 on the terminal device 2 side detects the PID match of each program data during recording and playback, and the compressed or uncompressed recording is performed. The video distribution service system according to the second embodiment discriminates between program data recorded after compression and program data recorded without compression during recording. The discriminating data is written in a table, and reproduction is performed with reference to this table at the time of reproduction, so that the PID register and the coincidence detection circuit of the reproduction unit can be omitted.
[0075]
The video distribution service system according to the second embodiment is different from the video distribution service system according to the first embodiment only in this point. Therefore, in the following description, the operation of the recording / playback unit, which is a different point, is described. Reference will be made only to, and duplicate explanation will be omitted. Also, parts that show the same operations as those of the recording / reproducing unit shown in FIGS. 7 and 8 are denoted by the same reference numerals, and redundant description is omitted.
[0076]
That is, the recording unit of the recording / reproducing unit 13 of the video delivery service system according to the second embodiment includes a packet data compression unit 72, a packet header detection unit 73, a control circuit 74, a PID register 75, as shown in FIG. Along with the coincidence detection circuit 76, a table 78 is provided in which discriminating data indicating whether the program data selected by the user matches or does not match the PID is provided.
[0077]
In such a recording unit, the PID register 75 stores PIDs such as program guide information and viewing right relation information corresponding to the program selected by the user, and is shown in FIG. Each program data of the transmission channels of programs A to D is supplied. The packet header detection circuit 73 detects the header information of each program data, extracts the PID included in the header information, and supplies it to the match detection circuit 76. The coincidence detection circuit 76 compares the extracted PID with the PID of the program selected by the user stored in the PID register 75 and supplies this comparison output to the control circuit 74.
[0078]
When the comparison output indicating that the two do not match is supplied, the control circuit 74 indicates that the program has not been selected by the user, so the header information of the program data is displayed in the corresponding area in the table 78. For example, discriminating data (attribute value) of “0” is recorded. Further, the packet data compression unit 72 is controlled to stop so as not to output program data not selected by the user.
[0079]
On the other hand, if a comparison output indicating that the two match is supplied, the program is selected by the user, so the header information of the program data is recorded in the corresponding area in the table 78. For example, the discrimination data “1” is recorded and controlled. Further, the packet data compression unit 72 is driven and controlled to output the program data selected by the user.
[0080]
Thereby, as shown in FIG. 11, discriminating data indicating the attribute (whether or not selected by the user) is recorded in the table 78 together with the header information of each program data. Then, as shown in FIG. 12B, only the program data of the program selected by the user is compressed and output via the output terminal 77.
[0081]
The program data output via the output terminal 77 is recorded on a recording medium. At this time, the control circuit 74 reads out the header information and the discrimination data of each program stored in the table 78, Are recorded on a recording medium together with the program data.
[0082]
Specifically, the control circuit 47 controls the recording of the header information of each program stored in the table 78 and the header information of each program at the subsequent stage of the program data recorded after being compressed. Each discriminating data which is a flag of “1” or “0” is recorded and controlled in the information spare area (reserved area). As a result, it is possible to perform recording control in such a manner that the header information and the discrimination data of each program are superimposed on the program data selected by the user.
[0083]
Alternatively, the header information and the discrimination data of each program may be recorded and controlled not in the subsequent stage of the program data compressed and recorded but in the previous stage of the program data. In this case, after the recording of the compressed program data is completed, the control circuit 47 returns the recording position to the previous stage of the compressed and recorded program data and controls the recording of the header information and the like.
[0084]
Alternatively, when the recording medium is a disc-shaped recording medium such as an optical disk or a magnetic disk, recording control may be performed in the form of a file in the user TOC (table of contents) or the like.
[0085]
Next, the program data, each header information, and each discrimination data recorded on the recording medium in this way are reproduced by the reproducing unit of the recording / reproducing unit 13 as shown in FIG.
[0086]
In FIG. 10, program data reproduced from a recording medium by a reproducing head (not shown), each header information and each discrimination data are supplied via an input terminal 81, and these are supplied to a packet data decompression circuit 82 and a packet header detection circuit. 83.
[0087]
The packet header detection circuit 83 detects each header information and discrimination data of each program data from the supplied data, and supplies this to the control circuit 84. The control circuit 84 stores and controls the header information and the discrimination data in the table 88.
[0088]
The packet header detection circuit 83 detects each header information of each program data from the supplied data, and supplies this to the control circuit 84. When each header information is supplied, the control circuit 84 refers to the table 88 and detects discrimination data of the currently supplied header information. If the determination data is “0”, that is, if the program data corresponding to the current header information is not selected by the user, a dummy such as null data is provided after the header information. The packet data decompression circuit 82 is controlled so that data is added and output.
[0089]
On the contrary, if the discrimination data is “1”, that is, if the program data corresponding to the current header information is selected by the user, the header information and the program data are output as they are. Thus, the packet data decompression circuit 82 is controlled.
[0090]
Thereby, the program data of the transmission channels of the programs A to D as shown in FIG. 12C can be reproduced and output via the output terminal 87 of the reproducing unit.
[0091]
As is apparent from the above description, in the video distribution service system according to the second embodiment, in the recording unit of the recording / reproducing unit 13, the header information of each program and the discrimination data indicating the presence / absence of selection by the user are stored in the table 78. These are recorded on the recording medium together with the program data selected by the user, and the program data is selected by the user based on the discrimination data read from the recording medium at the time of reproduction. If it is selected by the user, it is reproduced as it is. If it is not selected by the user, dummy data such as null data is added to the header information for reproduction.
[0092]
As a result, the PID register and the coincidence detection circuit required by the playback unit can be omitted as shown in FIG. 10 to simplify the circuit configuration, and the video distribution service according to the first embodiment described above. The same effect as the system can be obtained.
[0093]
Next, the video distribution service system according to the third embodiment of the present invention will be described.
[0094]
In the video distribution service system according to the first embodiment described above, the recording / playback unit 13 on the terminal device 2 side detects the PID match of each program data during recording and playback, and the compressed or uncompressed recording is performed. In the video distribution service system of the third embodiment, the program data selected by the user is recorded without being run-length compressed at the time of recording, and is selected by the user. The program data that has not been recorded is recorded after run-length compression of the program data other than the header information, so that it is possible to omit the PID register and the coincidence detection circuit that are necessary for reproduction.
[0095]
The video distribution service system according to the third embodiment is different from the video distribution service system according to the first embodiment only in this point. Therefore, in the following description, the operation of the recording / reproducing unit, which is the different point, is described. Reference will be made only to, and duplicate explanation will be omitted. Also, parts that show the same operations as those of the recording / reproducing unit shown in FIGS. 7 and 8 are denoted by the same reference numerals, and redundant description is omitted.
[0096]
That is, the recording unit of the recording / reproducing unit 13 of the video distribution service system according to the third embodiment includes a packet header detection unit 73, a control circuit 74, a PID register 75, and a coincidence detection circuit 76 as shown in FIG. A null data generating circuit 90 for generating null data, a run length compressing circuit 92 for performing run length compression, and program data supplied via the null data from the null data generating circuit 90 or the input terminal 71 according to the PID are selected and run. And a selection switch 91 for supplying to the length compression circuit 92.
[0097]
In such a recording unit, it is assumed that the program B is selected as a program to be recorded by the user among the transmission channels composed of the program data of the programs A to D shown in FIG. First, each program data of the transmission channel supplied via the input terminal 71 is supplied to the selection switch 91 and the packet header detection circuit 73.
[0098]
The packet header detection circuit 73 detects the header of each program data of the transmission channel and supplies it to the control circuit 74 and the coincidence detection circuit 76. In this case, when the program B is selected by the user, the PID of the program B is loaded in the PID register 75, and the coincidence detection circuit 76 uses the PID loaded in the PID register 75 and the packet header. The PID of the header information of each program data detected by the detection circuit 73 is compared, and this comparison output is supplied to the control circuit 74.
[0099]
When the detection output indicating that the two are inconsistent is supplied from the coincidence detection circuit 76, the control circuit 74 selects the header information of the program data and supplies it to the run-length compression circuit 92. The selection switch 91 is selected and controlled so that null data from the null data generation circuit 90 is selected as data other than the data and supplied to the run-length compression circuit 92.
[0100]
On the contrary, when the detection output indicating that the two match each other is supplied from the coincidence detection circuit 76, the control circuit 74 supplies the header information and the packet body (payload) to the run length compression circuit 92. The selection switch 91 is selected and controlled. As a result, the run-length compression circuit 92 receives the program data of the program B selected by the user and the programs A, C and D in which data other than the header information is null data as shown in FIG. The program data of the transmission channel composed of each of the program data is supplied.
[0101]
Then, the control circuit 74 controls the run-length compression circuit 92 so as to perform the run-length compression process on the portion of the null data for the program data of the transmission channel whose data other than the header is null data. Thereby, each program data of the transmission channel in which only the null data as shown in FIG. 15 (c) is run-length compressed is output via the output terminal 77, and is recorded on the recording medium.
[0102]
In addition, the control circuit 74 sets a flag indicating that the run-length compression processing has been performed on the PID of the header information corresponding to the null data subjected to the run-length compression processing.
[0103]
Next, each program data of the transmission channel recorded on the recording medium in this way is reproduced by a reproducing head (not shown), and a run length expansion circuit is connected via the input terminal 81 of the reproducing unit of the recording / reproducing unit 13 shown in FIG. 93 and the packet header detection circuit 83.
[0104]
The packet header detection circuit 83 detects header information of each program data of the transmission channel and supplies the detection output to the control circuit 84. The control circuit 84 detects the PID in the header information based on the detection output from the packet header detection circuit 83.
[0105]
As described above, the run-length compressed data among the program data of the transmission channel is only null data. For this reason, the control circuit 84 performs the run length decompression process at the timing when the null data is supplied to the run length decompression circuit 93 only when the PID in the header information indicates that the run length compression process has been performed. The run-length expansion circuit 93 is controlled so that
[0106]
As a result, as shown in FIG. 15 (d), the program data of the program B selected by the user and the program data of the program A, the program C, and the program D having the payload set as each header information and null data are formed. The transmission channel is reproduced and output via the output terminal 87.
[0107]
As is clear from the above description, the video distribution service system of the third embodiment uses the payload of a program other than the program selected by the user as null data, performs run-length compression only on this null data portion, A header is recorded with the flag of the PID of the header information of the program data subjected to the run length compression, and at the time of reproduction, only the data with the flag set in the PID is reproduced by the run length decompression process. In addition to omitting the necessary PID register and coincidence detection circuit, the same effect can be obtained with the video distribution service system of the first embodiment described above.
[0108]
Next, a video distribution service system according to a fourth embodiment of the present invention will be described.
[0109]
In the video distribution service system of each of the embodiments described above, the transmission channel is formed only from program data of programs A to D, for example. In addition to the program data, data (additional information) such as program guide information as shown in FIG. As the program guide information, the same contents are often repeatedly superimposed a plurality of times, and if all of them are recorded together with the program data, the recording area of the recording medium cannot be used efficiently. Hereinafter, the additional information will be described as program guide information.
[0110]
The video distribution service system of the fourth embodiment is intended to minimize the recording of the program guide information and improve the recording efficiency of the recording medium.
[0111]
In the video distribution service system of the fourth embodiment, the configuration of the recording / reproducing unit 13 is characteristic in order to minimize the recording of program guide information, and the other configurations are described above. This is the same as the video distribution service system of the first embodiment. Therefore, in the following description, only the operation of the recording / reproducing unit, which is this different point, will be referred to, and redundant description will be omitted.
[0112]
That is, the recording unit of the recording / reproducing unit 13 of the video distribution service system according to the fourth embodiment includes the packet data compression unit 72, the packet header detection circuit 73, the control circuit 74, and the PID register 75 as shown in FIG. In addition to the coincidence detection circuit 76, a memory 95 is provided for storing program guide information in the transmission channel.
[0113]
Such a recording unit includes packets 1 to 4 of program guide information, program data of program A, program guide information, and program data of program B as shown in FIG. A transmission channel is provided. Each program guide information has the same contents.
[0114]
For example, if the user selects both programs A and B as programs to be recorded from the transmission channels, the PID registers 75 are loaded with the PIDs of the programs A and B.
[0115]
The packet header detection circuit 73 detects header information attached to each program guide information and program data of the transmission channel supplied via the input terminal 71, and supplies this detection output to the coincidence detection circuit 76. The coincidence detection circuit 76 compares the header information detected by the packet header detection circuit 73 with the header information loaded in the PID register 75 and supplies this comparison output to the control circuit 74.
[0116]
As described above, in this case, both the programs A and B are selected by the user. For this reason, the control circuit 74 determines that the data currently supplied through the input terminal 71 is the program data of the program A or the program B when the comparison output indicating that the two match is supplied. For the sake of illustration, the packet data compression unit 72 is controlled so that it is output without being compressed.
[0117]
The control circuit 74 indicates that the data currently supplied via the input terminal 71 is program guide information when the comparison output indicating that the two do not match is first supplied. The control circuit 74 controls the storage of the program guide information in the memory 95 and also controls the packet data compression circuit 72 so that the program guide information is output as it is without being compressed.
[0118]
When the program guide information is stored in the memory 95 as described above, the program guide information is already stored in the memory 95 when the comparison output indicating that the two do not match is supplied next. Will be. For this reason, if the program guide information has already been stored in the memory 95 when the comparison output indicating that the two do not match is next supplied, the control circuit 74 does not change the contents. It is determined whether or not. If the contents are not changed, the packet data compression circuit 72 is controlled to compress the program guide information together with the header information. If the contents are changed, the program guide information is stored and controlled in the memory 95, the contents of the memory 95 are updated, and the program guide information is output as it is without being compressed. The data compression circuit 72 is controlled.
[0119]
As a result, as shown in FIG. 18B, one of the program guide information having the same contents included in the transmission channel (program guide information transmitted later in time) can be compressed. Each data of such a transmission channel is output via the output terminal 77 and recorded on a recording medium. The data recorded on this recording medium is one in which one piece of program guide information having the same content is compressed together with header information. For this reason, as shown in FIG. 18C by omitting the recording area of the compressed program guide information in a pseudo manner, it is possible to prevent the recording area of the recording medium from being occupied by the overlapping program guide information. The recording area of the recording medium can be used efficiently.
[0120]
Next, the reproducing unit of the recording / reproducing unit 13 that reproduces the data recorded on the recording medium as described above includes a packet data decompressing unit 82, a packet header detecting circuit 83, a control circuit 84, and a PID register as shown in FIG. 85. In addition to the coincidence detection circuit 86, a memory 95 for storing program guide information in the transmission channel is provided.
[0121]
In such a reproducing unit, uncompressed program guide information, program A program data, program guide information compressed together with header information, and program B information as shown in FIG. A transmission channel consisting of each packet 1 to 4 of program data is supplied.
[0122]
The packet header detection circuit 83 detects the header information attached to each program guide information and program data of the transmission channel supplied via the input terminal 81, and supplies this detection output to the coincidence detection circuit 86. The coincidence detection circuit 86 includes the header information detected by the packet header detection circuit 83 and the header information of the program data selected by the user loaded in the PID register 85 (in this case, the header information of program A and program B). And the comparison output is supplied to the control circuit 84.
[0123]
When the control circuit 84 is supplied with a comparison output indicating that the two match, the control circuit 84 indicates that the data currently supplied through the input terminal 81 is the program data of the program A or the program B. The packet data decompression unit 82 is controlled so that it is output without being decompressed.
[0124]
Further, when a comparison output indicating that the two do not match is first supplied, it indicates that the data currently supplied via the input terminal 81 is uncompressed program guide information. The circuit 84 controls the storage of the uncompressed program guide information in the memory 96 and also controls the packet data decompression circuit 82 so that it is output as it is without being decompressed.
[0125]
Also, once the mismatch between the two is detected, the control circuit 84 decompresses only the header information based on the program guide information stored in the memory 96 each time a mismatch is next detected. Thus, the packet data decompression circuit 82 is controlled.
[0126]
Thus, as shown in FIG. 18 (d), program guide information and its header information positioned as the first data of the transmission channel, program data of program A and its header information, program guide information as compressed, and The header information, the program data of program B, and the header information can be reproduced.
[0127]
The program guide information other than the first program guide information is not reproduced, but the contents of the first program guide information and the program guide information after that are the same, and the programs other than the first program guide information There is no problem because the header information of the guide information is reproduced.
[0128]
As is clear from the above description, the video distribution service system of the fourth embodiment has the same content among the additional information such as program guide information transmitted by being multiplexed with each program data. Other than the first one (which may be second or third) are compressed and recorded together with the header information, and at the time of reproduction, only the header information of the compressed program guide information is decompressed and reproduced. As a result, it is possible to prevent the inconvenience of overlapping recording of program guide information with overlapping contents, so that the recording efficiency of the recording medium can be improved, and the video distribution of the first embodiment described above The same effect as the service system can be obtained.
[0129]
The memory 95 for storing the program guide information described in the video distribution service system of the fourth embodiment is the video of the second embodiment described above as a memory 98 as shown by the dotted line block in FIG. It may be provided in the distribution service system, or may be provided as the memory 99 in the video distribution service system of the above-described third embodiment as indicated by a dotted line block in FIG. As a result, similar to the video distribution service system of the fourth embodiment, it is possible to prevent redundant recording of additional information such as program guide information and efficiently use the recording area of the recording medium.
[0130]
Next, a video distribution service system according to the fifth embodiment of the present invention will be described.
[0131]
In the data transmitted by time division multiplexing, as shown in FIG. 19A, time management information (PCR) necessary for reproduction is added to a field called an adaptation field (AF) of a packet of a specific program. Has been. This time management information has a small amount of data itself and is not always included in all packets of the program. Of course, time management information is not always added to the program selected to be recorded by the user.
[0132]
For this reason, in the video distribution service system of the fifth embodiment, when the control circuit 74 of the recording unit of the recording / reproducing unit 13 does not add time management information to the program designated for recording by the user, Although not specified by the user, a program packet to which time management information is added is input by the packet header detection circuit 73, the PID register 75, and the coincidence detection circuit 76 of the recording unit of each of the above embodiments. It is determined whether or not time management information is added to each packet. If time management information is not added, the packet is regarded as an unnecessary packet, and if time management information is added, the packet Of the data, for example, the remaining part excluding the adaptation field part is used as unnecessary data.
[0133]
Then, as described in the above embodiments, this packet is compressed by performing data compression processing or run-length compression processing. As a result, as shown in FIG. 19B, programs other than the program selected by the user (in this case, program B) can be compressed leaving the header information and the adaptation field, thereby further improving the recording efficiency. be able to.
[0134]
Next, a video distribution service system according to the sixth embodiment of the present invention will be described.
[0135]
Some program data transmitted by time-division multiplexing is encrypted in advance and transmitted. In order to view the encrypted program, it is necessary to decrypt the program based on the program viewing permission management information transmitted from the center apparatus 1 in a time division multiplexed manner. As the information (key) for decryption, different information is periodically transmitted according to the terminal device 2 of each subscriber.
[0136]
For this reason, the control circuit 74 of the recording / playback unit 13 of the video delivery service system according to the sixth embodiment uses the packet header detection circuit 73, the PID register 75, and the match detection circuit 76 to send a packet of the program viewing permission management information. To detect. Then, it is determined whether or not the packet is related to reception and recording / reproduction, and only when the packet is not related to reception and recording / reproduction, the packet is regarded as an unnecessary packet as described in the above embodiments. The data is compressed by performing data compression processing or run length compression processing. As a result, packets that are not related to reception and recording / reproduction can be compressed and recorded, and recording efficiency can be further improved.
[0137]
Finally, the description of each of the above-described embodiments is only an example of the present invention. For this reason, as long as it is a range which does not deviate from the technical idea concerning this invention, of course, various changes are possible according to a design etc.
[0138]
【The invention's effect】
Since the recording / reproducing apparatus according to the present invention can compress unnecessary unnecessary data and record it, the recording area occupied by the unnecessary data on the recording medium can be minimized. The recording area on the recording medium can be used efficiently.
[0139]
Even if it is unnecessary data to be compressed, the header information portion is recorded without being compressed. Therefore, the original bit length data is used by using the time information attached to the original header information. Can be played. For this reason, it is not necessary to form header information with new time information added to each data, and to form and record the header information with the new time information added and to reproduce the data with the header information added. Therefore, it is possible to omit a complicated processing circuit and the like required for the recording / reproducing apparatus, and to reduce the circuit scale and cost of the recording / reproducing apparatus.
[Brief description of the drawings]
FIG. 1 is an overall block diagram of a video distribution service system according to a first embodiment to which a recording / reproducing apparatus according to the present invention is applied.
FIG. 2 is a block diagram of a program distribution center provided on the center device side of the video distribution service system according to the first embodiment.
FIG. 3 is a block diagram of a transmission processing circuit provided in the program distribution center.
FIG. 4 is a block diagram of another program distribution center provided on the center device side of the video distribution service system according to the first embodiment.
FIG. 5 is a block diagram of a receiver decoder provided on the terminal device side of the video distribution service system according to the first embodiment.
FIG. 6 is a diagram showing transmission channel program data transmitted from the center device side and transmission channel program data recorded and reproduced on the terminal device side.
FIG. 7 is a block diagram of a recording unit provided in a recording / reproducing unit on the terminal device side that records program data of the transmission channel.
FIG. 8 is a block diagram of a reproducing unit that reproduces program data of a transmission channel recorded by the recording unit.
FIG. 9 is a block diagram of a recording unit provided in a recording / reproducing unit on the terminal device side of the video distribution service system according to the second embodiment to which the recording / reproducing apparatus according to the present invention is applied.
FIG. 10 is a block diagram of a playback unit provided in a recording / playback unit on the terminal device side of the video distribution service system according to the second embodiment.
FIG. 11 is a diagram showing a packet identifier (PID) of each program data recorded in a table provided in a recording unit on the terminal device side of the video distribution service system according to the second embodiment.
FIG. 12 is a diagram showing program data recorded and reproduced by a recording / reproducing unit on the terminal device side of the video distribution service system according to the second embodiment.
FIG. 13 is a block diagram of a recording unit provided in a recording / reproducing unit on the terminal device side of a video distribution service system according to a third embodiment to which the recording / reproducing apparatus according to the present invention is applied.
FIG. 14 is a block diagram of a playback unit provided in a recording / playback unit on the terminal device side of the video distribution service system according to the third embodiment.
FIG. 15 is a diagram illustrating program data recorded and reproduced by a recording and reproducing unit on a terminal device side of the video distribution service system according to the third embodiment.
FIG. 16 is a block diagram of a recording unit provided in a recording / reproducing unit on the terminal device side of a video distribution service system according to a fourth embodiment to which the recording / reproducing apparatus according to the present invention is applied;
FIG. 17 is a block diagram of a playback unit provided in a recording / playback unit on the terminal device side of the video distribution service system according to the fourth embodiment.
FIG. 18 is a diagram showing each program data recorded / reproduced by a recording / reproducing unit on the terminal device side of the video distribution service system according to the fourth embodiment.
FIG. 19 is a diagram showing program data recorded and reproduced by a recording and reproducing unit on a terminal device side of a video distribution service system according to a fifth embodiment to which the recording and reproducing device according to the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Center apparatus, 2 ... Terminal device, 3 ... Communication satellite, 4 ... Software supply center
5 ... Operation center, 6 ... Program distribution center, 7 ... Transmitter
8 ... Terminal body, 9 ... Television receiver, 10 ... Receiver
11 ... Telephone / modem, 12 ... Receiver decoder, 13 ... Recording / playback unit
72: Packet data compression circuit, 73: Packet header detection circuit
74 ... control circuit, 75 ... PID register, 76 ... coincidence detection circuit
82 ... Packet data decompression circuit

Claims (6)

Select one or more desired data to be recorded from each piece of data that is packetized and time-division multiplexed together with header information with time management information necessary for data reproduction at a predetermined period Recording data selection means for recording, recording coincidence detection means for detecting coincidence between the header information of each transmitted data and the header information of the data selected by the recording data selection means, and the recording coincidence detection means When a match between the header information is detected, the corresponding data is recorded on a recording medium without being compressed. When a mismatch between the header information is detected by the recording match detection unit , the recording data selection is performed. If header information attached to data other than the data selected by the means is detected and time management information is not attached to the header information, And compressing and recording data, if are denoted by the time management information in the header information, a recording unit and a recording control means for recording on a recording medium by compressing the data other than the time management information,
Reproduction data selection means for selecting desired data to be reproduced from the data recorded on the recording medium, header information of each data reproduced from the recording medium, and the reproduction data selection means Reproduction match detection means for detecting a match with the header information of the data, and when the match between the header information is detected by the reproduction match detection means, the corresponding data is reproduced without being decompressed, and the reproduction match detection is performed. And a reproduction control unit that decompresses and reproduces a portion other than the header information of the corresponding data when a mismatch is detected by the means.   The reproduction control means reproduces all data other than the header information of the data as null data that is all zero data when the reproduction coincidence detection means detects a mismatch of the header information. Item 4. The recording / reproducing apparatus according to Item 1.   The recording control means, when a mismatch of the header information is detected by the recording coincidence detecting means, sets the portion other than the header information of the corresponding data as null data, and records the null data by run-length compression processing. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus records on a medium. The recording means has a recording table for recording determination data indicating whether or not the data is compressed together with header information of each data, and the recording control means records in the recording table. And the recorded header information and each discrimination data is recorded on the recording medium, and only when the matching of the header information is detected by the recording match detection means, the corresponding data is recorded on the recording medium without being compressed,
The reproduction control means reproduces the data recorded without being compressed on the recording medium based on the header information and the discrimination data of each data reproduced from the recording medium, without decompressing the data. The data other than the data recorded in the data is reproduced as null data which is all zero data, and the corresponding header information reproduced from the recording medium is added to the null data for reproduction. The recording / reproducing apparatus as described.   The recording means has additional information storage means for storing additional information transmitted with header information attached thereto, and the recording control means stores and controls the transmitted additional information in the additional information storage means. At the same time, each time additional information is recorded on the recording medium without being compressed, the additional information stored in the additional information storage means is compared with the newly transmitted additional information. If they match, the newly transmitted additional information is compressed and recorded. If they do not match, the new additional information is stored and controlled in the additional information storage means and updated. 5. The recording / reproducing apparatus according to claim 1, wherein information is recorded on a recording medium. Each piece of data that is time-division multiplexed and transmitted is subjected to a predetermined encryption process, and decrypted data for decrypting the encrypted data is transmitted as the data. And
If the transmitted decoded data corresponds to the data selected by the recorded data selecting means, the recording control means records the decoded data without compression and transmits the decoded data but one of claims 1 to 5 in the case which corresponds to the data other than the selected data to the recording data selection means is characterized by compressing and recording the decoded data 1 The recording / reproducing apparatus according to the item.

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