JPH08115572A - Recording and reproducing device - Google Patents

Abstract

PURPOSE: To prevent reduction of data recordable with a digital VTR. CONSTITUTION: The data in the image region of a data buffer 5 is decoded in the order of ECC3 and ECC2 respectively by an ECC3 coding/decoding circuit 9 and a coding circuit 7 and thereafter the parities of data, ECC3 and ECC2 are coded in the order of ECC1 by a coding circuit 11 to store these codes into the image region of a magnetic tape 17 through a modulation circuit 13 and a recording circuit 15. Immediately after this, the data is reproduced by a reproducing circuit 19 and a demodulation circuit 21 to decode the code words of ECC1 and ECC2 by a decoding circuit 23 and a decoding circuit 25 respectively. When, for example, the reproduced data does not agree with the recorded data, the corresponding recorded data is coded for voice by the coding circuit 7 in the order of ECC2 and coded by the coding circuit 11 in the order of ECC1 to be recorded in the voice region of the magnetic tape 17 this time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing digital data on a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, a digital recording / reproducing apparatus (hereinafter referred to as VT
In R), an area for recording video and an area for recording audio are separated on the magnetic tape. FIG. 4 shows an example of the information amount for one recording track. This is to enable after-recording and multi-tracking.

When such a digital VTR is used as a data streamer, conventionally, only the image area of the magnetic tape is used. Therefore, the voice area is not used, and the usage efficiency of the magnetic tape is poor.

In a data streamer system (hereinafter referred to as a tape streamer) using a magnetic recording medium, a READ AFTER is performed in order to confirm whether recording has been performed accurately.
It is customary to implement WRITE (hereinafter referred to as RAW).

FIG. 5 shows the configuration of a conventional tape streamer (Japanese Patent Laid-Open No. 2-503490). The computer-generated data to be recorded is received from the computer 101 via the interface 103, and the data buffer 10
Written to 5. The data from the data buffer 105 is provided to the WRITE formatter 107, which is the format signal generator and ordering circuit 10.
Formatted by the signal generated by 9.

A command signal from the computer 101 is decoded by the interface 103 and read, WR
Determine the mode such as ITE. In WRITE mode,
WRITE formatter 107 to serializer 111
And WRITE circuit 113, and magnetic READ / WR
It is supplied to the ITE head 115 and recorded on the magnetic tape 117.

Here, READ is also performed immediately after WRITE. The READ signal is supplied to the READ deformatter 123 through the READ circuit, the clock 119, the READ (10/8) demodulator and the deserializer 121, and further to the data buffer 105.

Here, WRITE data and READ
If the data matches, the WRITE succeeds; if they do not match, the WRITE fails, and in this case, the WRITE data is R.
EWRITE.

At this time, a device for avoiding the influence of scratches on the magnetic tape 117 and clogging of the magnetic head is made by changing the data writing position on the magnetic tape 117 and the writing head from the previous writing ( Special table flat 5
-500583).

Further, the tape streamer is subjected to error correction coding such as a product code in a recording track or between adjacent tracks, but in order to improve the reliability of the recorded data, an error correction sequence extending over several tracks is used. (Hereinafter ECC
3) is added. For example, as shown in FIG. 6, out of 20 tracks, data obtained by encoding Reed Solomon or the like on 18 tracks is recorded with parity on 2 tracks, and 1 or 2 tracks are corrected.

Now, as shown in FIG. Consider a case in which uncorrectable data occurs in 10 tracks. If rewriting is performed after 6 tracks by the previous RAW operation, 21 tracks need to be reproduced in order to decode the code word of ECC3.

As described above, when the RAW is performed, the physical data format on the tape at the time of recording is different from the physical data format at the time of reproducing, so that the number of tracks required to decode the ECC3 code word changes, and the hardware is changed. Wear becomes complicated.

Further, there is a drawback that the capacity of actually recordable data is reduced by rewriting.

Further, in the conventional tape streamer, since recording is performed in order from the start end of the tape, additional writing cannot be performed in a portion where recording is performed once.

For example, as shown in FIG. 8, consider a case where a file having a structure of A to H is recorded in the first recording and then a file J is added. As shown in FIG. 8, the first files A to H are recorded on the magnetic tape in the portion (1), and subsequently the J file is recorded in the portion (2). Here, when it is desired to read B to E and J files, it is necessary to first reproduce B to E in the portion (1) and then search the portion (2) to reproduce J. Since the files B to E and the J file are physically separated from each other, there is a drawback that the search takes time.

[0016]

As described above, the conventional tape streamer has a drawback that the amount of data that can be actually recorded is reduced by re-recording after RAW and the hardware becomes complicated.

Further, the conventional tape streamer has a drawback that it takes a long time to search because an additional file is recorded on a physically separated track.

It is an object of the present invention to provide a recording / reproducing apparatus which realizes a data streamer which enables re-recording after RAW without reducing the capacity of recordable data and also simplifies hardware.

It is another object of the present invention to provide a recording / reproducing apparatus which realizes a data streamer capable of recording an additional file in a place not physically separated from an associated file.

[0020]

[Means for Solving the Problems]

(First recording / reproducing apparatus) In a recording / reproducing apparatus which divides at least first and second areas diagonally to the longitudinal direction of the magnetic tape and records a plurality of types of data in each area, Recording means for recording data in the first area, reproducing means for immediately reproducing the data recorded in the first area of the magnetic tape, and whether the data reproduced immediately by the reproducing means has an error. or not,
Or recording means for detecting whether or not it matches the recorded data, and when the detecting means detects that there is an error in the data reproduced immediately after, or does not match the recorded data, the recording means. Re-records the data in the second area of the magnetic tape.

(Second Recording / Reproducing Apparatus) In the recording / reproducing apparatus which divides at least first and second areas diagonally to the longitudinal direction of the magnetic tape and records a plurality of types of data in each area, A first recording means for recording data in the first area of the magnetic tape, a reproducing means for immediately reproducing the data recorded in the first area of the magnetic tape, and a reproducing means immediately after the reproducing means. Detecting means for detecting whether or not there is an error in the data, or whether or not it matches the recorded data, and detecting that the data reproduced immediately after this detecting means has an error or does not match the recorded data In this case, a second recording means for rerecording the data in the second area of the magnetic tape is provided.

(Third recording / reproducing apparatus) In the recording / reproducing apparatus which divides at least first and second areas diagonally to the longitudinal direction of the magnetic tape and records a plurality of types of data in each area, Data is recorded in the first area of the magnetic tape, and data to be added to the recorded data is recorded in the second area of the magnetic tape.

[0023]

When the data reproduced immediately after recording has an error or does not match the recorded data, the data is re-recorded in the second area, for example, the audio area, instead of the first area of the magnetic tape.

As a result, the physical data format at the time of recording matches the physical data format at the time of normal reproduction, the amount of data that can actually be stored is not reduced, and the hardware can be simplified.

Data to be added to the data stored in the first area of the magnetic tape is stored in the second area of the magnetic tape. This allows the additional data to be stored physically close to the relevant data, saving search time.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of a digital recording / reproducing apparatus (hereinafter referred to as VTR) used as a tape streamer. When operating as a normal digital VTR, video data and audio data are input to the data buffer 5, respectively. But if it works as a tape streamer,
Only data from computer 1.

At the time of recording, the data from the computer 1 is written in the data buffer 5 via the interface 3. At this time, the data is written to an address in the data buffer 5 that accommodates the video area. The ECC3 encoding / decoding circuit 9 reads the data in the order of ECC3, encodes the data, and generates the parity when the data of the encoding unit of the ECC3 is written in the data buffer 5. This parity is written in the data buffer 5.

Next, the encoding circuit 7 sets the data buffer 5 in the order of ECC2 which is the outer code of the product code in one track.
The data is read from the video area of, encoded, and the parity is generated. This parity is written in the video area of the data buffer 5. After encoding the ECC2 in the video area, if there is data in the audio area, the data is read and encoded in the order of ECC2 and the parity is generated. This parity is written in the voice area of the data buffer 5.

The encoding circuit 11 reads out the data and the parity of ECC3 and ECC2 from the video area of the data buffer 5 in the order of ECC1, encodes them, and generates the parity, and supplies it to the modulation circuit 13. ECC1 at this time
The parity of is not written in the data buffer 5, but is directly supplied to the modulation circuit 13.

The modulation circuit 13 converts byte data or parity into a bit stream. Recording circuit 15
Records the data and the parity of ECC1, ECC2 and ECC3 in the video area of the magnetic tape 17.

Playback from the video area of the magnetic tape 17
Immediately after the recording. The reproducing circuit 19 uses the magnetic tape 1
The signal is reproduced from 7 and supplied to the demodulation circuit 21. The demodulation circuit 21 performs an operation reverse to that of the modulation circuit 13, and converts the bit stream into byte-unit data and parity.

The decoding circuit 23 error-corrects the ECC1 code words sent in the order of ECC1, and writes the result in the video area of the data buffer 5. At this time, ECC
Parity of 1 may be removed.

Next, the decoding circuit 25 reads the code words of ECC2 from the video area of the data buffer 5 in the order of ECC2, performs error correction, and writes them in the video area of the data buffer 5. At this time, the parity of ECC2 may be removed.

The data buffer 5 compares the decoded data with the recorded data. If they do not match, or if the decoding circuit 25 cannot correct the error, the following operation is performed.

The encoding circuit 7 reads out the data to be re-recorded from the video area of the data buffer 5 in the order of the ECC 2 for a plurality of times, encodes the data for audio, and generates respective parities. Is written in the voice area of the data buffer 5. After that, the above-described processing is performed by the encoding circuit 11 and the modulation circuit 13, and then the recording circuit 15 records the data on the audio area of the magnetic tape 17 over several tracks. At this time, the parity of ECC2 can also play the role of the parity of ECC3 in the voice area.

Finally, the data of the audio area written in the data buffer 5 and the parity of the ECC 2 are subjected to the above-mentioned processing in the encoding circuit 11 and the modulation circuit 13, and then the recording circuit 15 performs the audio area of the magnetic tape. Recorded in. Of course, in parallel with this recording, new data in the video area of the data buffer 5 is encoded as described above and recorded in the video area of the magnetic tape 17.

An example of the data recorded as described above is shown in FIG. Here, as in FIG. When there is an uncorrectable error in the video area of 10 tracks, re-recording is performed after 6 tracks, but in the present invention, re-recording is performed in the audio area over 3 tracks after 6 tracks. As a result, the physical data format when recording the video area of the magnetic tape 17 and the physical data format when reproducing match.

The normal reproduction is almost the same as the reproduction immediately after the recording, but since there is no recorded data in the video area of the data buffer 5, the coincidence with the recorded data is not detected after the error correction by the decoding circuit 25. Is different. Instead of this coincidence detection, the data recorded in the audio area of the magnetic tape 17 is reproduced / decoded to replace the uncorrectable data in the video area of the data buffer 5.

As described above, the data to be re-recorded during RAW can be recorded and reproduced in the audio area of the track.

Further, as a second embodiment, a case where the additional file J is recorded in the audio area of the magnetic tape 17 as shown in FIG. 3 will be described. Consider a case in which files A to H are recorded in the video area of the magnetic tape 17 as shown in (1) of FIG. 3 in the digital VTR of FIG.

In the conventional example, as shown in FIG. 8, after the files A to H record the file at the location (1) of the magnetic tape, the additional file J is recorded at the location (2) after several tracks. Become.

On the other hand, in FIG. 3, after recording at the location (1) of the magnetic tape, when an additional file is designated, a search is made up to the video area of the magnetic tape where B to E, which are linked on the directory, are recorded. The file J is recorded in the audio area of the subsequent tracks.

With this operation, it takes more time than before when recording, but in reality there is a problem when reading data. As described above, files related to each other are physically close to each other. It becomes possible to play a series of files.

[0044]

According to the present invention, the data is stored in the video area of the magnetic tape, and the re-recorded data by RAW is recorded in the audio area of the magnetic tape, so that the usage efficiency of the magnetic tape can be improved and actually recorded. The data capacity is not reduced and the hardware can be simpler than before.

Further, even when a small file is additionally recorded, by recording in the audio area of the magnetic tape, it is possible to record in the vicinity of files connected in the directory, so that a series of files can be reproduced at high speed. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a digital VTR of the present invention used as a tape streamer.

FIG. 2 is a diagram showing tracks of a magnetic tape recorded by a digital VTR of the present invention.

FIG. 3 is a diagram showing tracks of a magnetic tape recorded by a digital VTR of the present invention.

FIG. 4 is a diagram showing an information amount for one recording track.

FIG. 5 is a block diagram showing a configuration of a conventional tape streamer.

FIG. 6 is a diagram showing tracks of a magnetic tape recorded by a conventional tape streamer.

FIG. 7 is a diagram showing tracks of a magnetic tape recorded by a conventional tape streamer.

FIG. 8 is a diagram showing tracks of a magnetic tape recorded by a conventional tape streamer.

[Explanation of symbols]

1 ... Computer, 3 ... Interface, 5 ... Data buffer, 7 ... Encoding circuit (ECC2), 9 ... ECC3
Encoding / decoding circuit 11, encoding circuit (ECC1),
13 ... Modulation circuit, 15 ... Recording circuit, 17 ... Magnetic tape,
19 ... Reproduction circuit, 21 ... Demodulation circuit, 23 ... Decoding circuit (ECC1), 25 ... Decoding circuit (ECC2).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 20/12 103 9295-5D 20/14 341 A 9463-5D H04N 5/7826 5/92 (72 Inventor Junko Kimura 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Inside Toshiba Multimedia Technology Research Institute (72) Inventor Yoshihisa Sakazaki Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Inside Toshiba Multimedia Technology Research Institute

Claims (7)

[Claims] 1. A recording / reproducing apparatus which divides at least first and second areas in an oblique direction with respect to a longitudinal direction of a magnetic tape, and records a plurality of types of data in each area, respectively. Recording means for recording data in the area, the reproducing means for immediately reproducing the data recorded in the first area of the magnetic tape, and whether or not there is an error in the data reproduced immediately by the reproducing means, Or a detection means for detecting whether or not it matches the recorded data, and whether the data reproduced immediately after this detection means has an error,
Alternatively, when it is detected that the data does not match the recorded data, the recording unit re-records the data in the second area of the magnetic tape. 2. A recording / reproducing apparatus which divides at least first and second areas diagonally to a longitudinal direction of a magnetic tape and records a plurality of types of data in each area respectively. First recording means for recording data in the area, the reproducing means for immediately reproducing the data recorded in the first area of the magnetic tape, and whether the data reproduced immediately after this reproducing means has an error. Whether or not there is an error in the data reproduced immediately after the detection means for detecting whether or not it matches the recorded data,
Or a second recording means for rerecording the data in the second area of the magnetic tape when it is detected that the data does not match the recorded data. 3. A means for reproducing a series of data before recording from the data reproduced from the first and second areas of the magnetic tape by the reproducing means in a normal reproducing operation. The recording / reproducing apparatus according to claim 1. 4. The recording / reproducing apparatus according to claim 1, wherein the first area of the magnetic tape is a video area, and the second area is an audio area. 5. A recording / reproducing apparatus which divides at least first and second areas diagonally to a longitudinal direction of a magnetic tape and records a plurality of types of data in each area respectively. The recording / reproducing apparatus is characterized in that the data is recorded in the area and the data to be added to the recorded data is recorded in the second area of the magnetic tape. 6. The recording / reproducing apparatus according to claim 5, wherein a series of data before recording is reproduced from the data reproduced from the first and second areas of the magnetic tape. 7. The recording / reproducing apparatus according to claim 5, wherein the first area of the magnetic tape is a video area and the second area is an audio area.