JPH08249834A - Data recorder and data reproducing device - Google Patents

Abstract

PURPOSE: To realize an RAW with excellent use efficiency of a magnetic tape. CONSTITUTION: The inputted data are inputted to a formatter 1, and are formatted and outputted to a memory 2. The memory 2 stored the data to be recorded, and the data are error correction encoded by an error correction encoding circuit 5, and are modulated by a modulation circuit 6 to be recorded on a magnetic tape 8. A recorded track is reproduced, and is demodulated by a demodulation circuit 10 to be inputted to a judgement circuit 4 after it is error- corrected by the error correction encoding circuit. Simultaneously, the data of the recorded track are inputted to the judgement circuit 4, and whether or not the recorded track is correct is judged. The judged result of the judgement circuit 4 is transmitted to a controller 3. The controller 3 re-records the track when the recorded track is not correct.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device and a reproducing device for recording digital data.

[0002]

2. Description of the Related Art Presently, a digital VTR (VTR) which digitizes and compresses video and audio, and records and reproduces it on a magnetic tape.
ideo Tape Recorder) has been put to practical use. This digital VTR forms a track shown in FIG. 16 by helical scan recording and performs recording / reproduction. Here, 8 is a magnetic tape, and 21 is a recorded track. Further, in this digital VTR, video and audio are converted into frame unit data, and the frame unit data is divided into 10 tracks and recorded. At this time, a frame number representing the frame number and a track pair number representing the track pair number in the frame are recorded on the track. The frame number has a 2-bit width and is incremented by 1 for each frame, and the track pair number is a number which is incremented by 1 for every 2 tracks with the head track of the frame as 0. The arrangement of the magnetic tapes at this time is shown in FIG. Here, 20 is a frame.

Further, in this digital VTR, a track having a pilot tone is recorded for tracking. The tracks are F1 track having a pilot tone of frequency f1, F2 track having a pilot tone of frequency f2, and F2 having no pilot tone.
There are 0 tracks, F0 track, F1 track, F0
The track and the F2 track are recorded in this order.

Now, it has been considered to record other digital data such as video data compressed by another method or digital data of a computer on this digital VTR. At this time, for computer data, there is a method of reproducing the recorded data to ensure reliability, determining whether the recorded data is correct, and re-recording the data if it is determined to be incorrect. Are known. FIG. 18 is a layout diagram of the frame when it is determined that the frame of frame number 2 is incorrect. Generally, since it takes time to judge whether the recorded data is correct, the frame number 3 is recorded after the frame number 2 is recorded. Then, the frame of frame number 2 which is determined to be incorrect is re-recorded.

In this digital VTR, recording and reproduction are performed in units of frames. Therefore, if the recorded data is determined to be incorrect, the frame determined to be incorrect is re-recorded. DAT (Digit currently in practical use)
DDS (Digital Data Strage) using al Audio Tape)
The data of one frame is large in the digital VTR as compared with the data recording apparatus such as the above. This is because video data has a wider band than audio data, and a larger amount of data needs to be recorded. Further, depending on the head arrangement or the method of determination, it may be necessary to record a plurality of frames when it is determined to be incorrect.

The data recording device needs to hold the data of the recorded frame until the determination as to whether the recorded frame is correct or not is completed. Therefore, the data recording device requires a large-capacity memory, which causes a cost increase.

A frame is divided into a plurality of tracks for recording. At this time, it is also possible to judge whether the data recorded for each track is correctly recorded.
A block diagram of the recording apparatus at this time is shown in FIGS.
5 shows. Here, 1 is a formatter, 2 is a memory, 51 is a controller, 52 is a judgment circuit, 5 is an error correction coding circuit, 53 is a modulation circuit, 7a and 7b are recording heads, 8 is a magnetic tape, 9a and 9b is a reproducing head, 54 is a demodulation circuit, 11 is an error correction decoding circuit, 17
Is a servo circuit.

The input data is input to the formatter 1, formatted into 10-track data, and output to the memory 2. The memory 2 stores the data to be recorded and outputs it to the error correction coding circuit 5 in the order of recording.
The error correction coding circuit 5 performs error correction coding on the input data, adds parity, and outputs the data to the modulation circuit 53. The modulation circuit 53 adds a sync pattern, which is a mark for demodulation at the time of reproduction, to the input data and parity, modulates the data, outputs the data to the recording head 7, and records a track on the magnetic tape 8. At this time, the modulation circuit 53 modulates the odd-numbered tracks so as to become the F0 tracks having no pilot tone, and the even-numbered tracks alternately record the F1 tracks having the pilot tones of the frequency f1 for each even-numbered track. Modulation is performed so that an F2 track having a pilot tone of frequency f2 is obtained. As a result, the tracks are F0 track, F1 track, F0 track, F
It is recorded in the order of two tracks.

The reproducing head 9 reproduces the recorded track from the magnetic tape 8 and outputs a reproduced signal to the demodulation circuit 54.
The demodulation circuit 54 demodulates the reproduced signal and outputs it to the error correction decoding circuit 11. The error correction decoding circuit 11 performs error correction on the reproduced data using the parity added at the time of recording and outputs it to the determination circuit 52.

The error correction decoding circuit 11 performs error correction decoding on the input data and determines the error corrected data and an error flag indicating whether or not the data is erroneous.
Output to 2.

The correct data of the track corresponding to the data reproduced from the memory 2 is further input to the judgment circuit 52. The judgment circuit 52 compares the input data with each other, and when it judges that there are many errors, the controller 51
Signal that an error has occurred.

The controller 51 generates an address of the memory 2 and outputs it to the memory 2 so that the formatted data is sequentially output from the memory 2 to the error correction coding circuit 5 for each track when the recorded track is not erroneous. When the judgment circuit 4 judges that the recorded track is not correct, the address of the memory 2 is stored in the memory 2 so that the data to be re-recorded is output from the memory 2 to the error correction coding circuit 5 so as to sequentially re-record from the erroneous track. Output to 2. The controller 51 also outputs the correct data of the track reproduced from the memory 2 to the memory 2.
The address of is output to the memory 2.

A block diagram of the modulation circuit 53 is shown in FIG. Here, 30a and 30b are F0 modulation circuits, 31a,
Reference numeral 31b is an F1 modulation circuit, 32a and 32b are F2 modulation circuits, and 33a and 33b are recording amplifiers.

The track data is input to the modulation circuit 53 in the order of recording. When the track to be recorded by the recording head 7a is the F0 track, the output of the F0 modulation circuit 30a is amplified by the recording amplifier 33a, and then the recording head 7a is amplified.
Output to. When the track recorded by the recording head 7a is the F1 track, the output of the F1 modulation circuit 31a is amplified by the recording amplifier 33a, and then the recording head 7a is amplified.
Output to. Similarly, when the track recorded by the recording head 7a is the F2 track, the F2 modulation circuit 32a
The output of the recording head 33 after being amplified by the recording amplifier 33a.
output to a. Similarly, when the track to be recorded by the recording head 7b is the F0 track, the F0 modulation circuit 30b
Of the recording head 7 after amplifying the output of the recording amplifier 33b.
output to b. When the track recorded by the recording head 7b is the F1 track, the F1 modulation circuit 31b is used.
Of the recording head 7 after amplifying the output of the recording amplifier 33b.
output to b. Similarly, when the track recorded by the recording head 7b is the F2 track, the F2 modulation circuit 32 is used.
The output of b is amplified by the recording amplifier 33b and then output to the recording head 7b.

A block diagram of the demodulation circuit 54 is shown in FIG. Here, 34a and 34b are demodulation circuits and 35a and 35b.
Reference numeral b is an F0 track detection circuit. The reproduction signal of the reproduction head 9a is input to the F0 track detection circuit 35a. The reproduction signal of the reproduction head 9b is the F0 track detection circuit 3
5b is input. F0 track detection circuits 9a and 9
In b, an error signal of the F0 track is generated according to the pilot tone, and if the head is displaced from the F0 track for reproducing the F0 track, the servo circuit 17 is controlled to reproduce the F0 track or the reproducing head 9a or the reproducing head. 9b works to play the F0 track correctly. The servo circuit 17 reproduces the reproducing head 9a according to the error signal output from the F0 track detecting circuit 35a or 35b.
Alternatively, the motor is controlled so that the reproducing head 9b follows the F0 track.

It is judged whether the recorded data is correct or not for each track, and when the recorded data is not correct, if that track is re-recorded, the pilot tone sequence of the track is properly selected when re-recording. In order to achieve this, the scale of the recording circuit 6 is increased in order to record a track having a pilot tone. Further, in the home digital VCR, the number of tracks in one frame is 10 or 12, whereas it is judged whether the recorded data is correct or not for each track, and if the recorded data is not correct, the track is re-recorded. When recording, 5 bits were required as a field for recording the track number.

[0017]

DISCLOSURE OF THE INVENTION This digital VTR
Then, since recording and reproduction are performed in units of frames, if it is determined that the recorded data is incorrect, the frame determined to be incorrect is re-recorded. DDS (Dig) using DAT (Digital Audio Tape) currently in practical use
Compared to a data recording device such as ital Data Strage), one frame of data is large in a digital VTR. This is because video data has a wider band than audio data, and a larger amount of data needs to be recorded. Also,
Depending on the head arrangement or the determination method, it may be necessary to record a plurality of frames when it is determined to be incorrect.

The data recording device needs to hold the data of the recorded frame until the judgment as to whether the recorded frame is correct or not is completed. Further, in the data reproducing apparatus for reproducing the magnetic tape recorded by this data recording apparatus, it is necessary to hold the reproduced frame without outputting it until it is judged whether or not the reproduced frame is a frame judged to be correct at the time of recording. . Therefore, the data recording device or the data reproducing device requires a large-capacity memory, which causes a cost increase.

Further, there is a problem in that the recording capacity per frame is reduced each time re-recording is performed, so that the use efficiency of the magnetic tape is deteriorated.

Further, it is judged whether the recorded data is correct or not for each track, and when the recorded data is not correct, the track is re-recorded, but when re-recording, the line of pilot tones of the track is properly selected. For this reason, three kinds of tracks are selected and recorded for each recording head, and at the time of reproduction, it is not known because it is detected which of the reproduction heads is reproducing the F0 track. is necessary. Therefore, there has been a problem that the circuit scale of the recording circuit and the reproducing circuit becomes large.

In the home digital VCR, the number of tracks in one frame is 10 or 12, whereas it is judged whether the recorded data is correct or not for each track, and if the recorded data is not correct, When re-recording a track, 5 bits were required as a fold for recording the track number.

[0022]

In order to solve the above-mentioned problems, the first aspect of the present invention is to format input data into a format in which a frame is a unit, and an output of the format means is n lines. Means for recording on the magnetic tape as a track, reproducing means for reproducing from the magnetic tape, and determining whether or not the output of the reproducing means is correctly recorded based on the information of the formatting means, and when it is not correctly recorded The data recording apparatus is provided with a judging means for instructing the formatting means to re-record, and is provided with a judging means for judging whether or not the data is correctly recorded in units of i tracks.

A second aspect of the invention is a reproducing means for formatting data in frame units and reproducing from a magnetic tape recorded as n tracks; a deformatting means for deformatting the reproducing means; In a data reproducing apparatus, which comprises a judging means for judging whether the track reproduced by the reproducing means is not correct at the time of recording and is a re-recorded track so that the track is not outputted at the time of recording so as not to output the track. This is a configuration including the determination means for determining whether or not it was determined that the data was correctly recorded when the data was recorded in units of i tracks.

According to the third aspect of the present invention, the data is formatted in frame units and recorded on the magnetic tape as n tracks, and it is judged whether the data is correctly recorded in units of i tracks. If determined, reproducing means for reproducing from the magnetic tape rerecorded from the newly determined track after recording ixm tracks, and deformatting means for deformatting the reproducing means. And a judgment means for judging whether the track reproduced by the reproducing means is not correct at the time of recording and is a re-recorded track so that the track is not outputted so that it is judged as being correct at the time of recording. In the device, a frame number representing a frame of a reproduced track and the track in the frame Wherein when a track pair number representing the position different from the frame number and track pair number of units, each including a track which has been reproduced before mxi the mxi
This is a configuration including the judgment means for judging that the unit including the track reproduced before this time is correctly recorded at the time of recording.

[0025]

According to the present invention, when recording or reproducing digital data, it is judged whether or not the data is correctly recorded in units of i tracks, and the capacity of the memory of the data recording device or the data reproducing device is reduced to reduce the magnetic field. It works to improve the usage efficiency of the tape.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of the present invention.
Here, 1 is a formatter, 2 is a memory, 3 is a controller, 4 is a judgment circuit, 5 is an error correction coding circuit, 6 is a modulation circuit, 7a and 7b are recording heads, 8 is a magnetic tape, and 9a and 9b are reproduction. Head, 10 is a demodulation circuit, 1
Reference numeral 1 is an error correction decoding circuit, 17 is a servo circuit, 18a is data to be recorded on an odd-numbered track, 19a is data to be recorded on an even-numbered track, 18b is data reproduced from an odd-numbered track, and 19b is an even number. The data reproduced from the eighth track, 18c is data compared with the data reproduced from the odd-numbered tracks, and 19c is data compared with the data reproduced from the even-numbered tracks.

The input data is input to the formatter 1, formatted into 10-track data, and output to the memory 2. The memory 2 stores the data to be recorded and outputs the data to be recorded on the odd-numbered tracks and the even-numbered tracks in the recording order to the error correction coding circuit 5. The error correction coding circuit 5 performs error correction coding on the input data, adds parity, and outputs the data to the modulation circuit 6. The modulation circuit 6 adds a sync pattern, which is a mark for demodulation at the time of reproduction, to the input data and parity, modulates the data, outputs the data to the recording head 7a or 7b, and records a track on the magnetic tape 8. At this time, the modulation circuit 6 uses F0 in which the odd-numbered tracks have no pilot tone.
It is modulated so that it becomes a track, and even-numbered tracks alternately have F1 tracks having pilot tones of frequency f1 and F having pilot tones of frequency f2.
Modulation is performed so that there are two tracks. As a result, the tracks are recorded in the order of F0 track, F1 track, F0 track, and F1 track. At this time, the reproducing head 9 reproduces the recorded track from the magnetic tape 8 and outputs a reproduced signal to the demodulation circuit 10. The demodulation circuit 10 demodulates the reproduced signal and outputs it to the error correction decoding circuit 11. The error correction decoding circuit 11 performs error correction on the reproduced data using the parity added at the time of recording, and outputs the data 18b reproduced from the odd tracks and the data 19b reproduced from the even tracks to the judgment circuit 4. At this time, the demodulation circuit 10 controls the servo circuit 17 so that the head 9a reproduces an odd number of tracks based on the reproduction signal reproduced by the head 9a.

The error correction decoding circuit 11 performs error correction decoding on the input data and determines the error corrected data and an error flag indicating whether or not the data is incorrect.
Output to. The data and error flag obtained by reproducing the odd-numbered track and performing error correction decoding are the data 18b,
Data 19b is data and error flags obtained by reproducing even-numbered tracks and performing error correction decoding.

The decision circuit 4 has data 18b and 19
b is input from the error correction decoding circuit 11, and
Correct data 18c and 19c of the track corresponding to the data reproduced from the memory 2 are input. Here, the data 18b is the correct data recorded on the odd-numbered tracks, and the data 19b is the correct data recorded on the even-numbered tracks. The judgment circuit 4 compares the data 18b and the data 18c, and the data 19b and the data 19c, respectively, and when it judges that there are many errors, it informs the controller 3 that an error has occurred.

The controller 3 generates an address of the memory 2 and outputs it to the memory 2 so that the formatted data is sequentially output from the memory 2 to the error correction coding circuit 5 for each track when the recorded track is not erroneous. ,
When the judgment circuit 4 judges that the recorded track is not correct, the data to be re-recorded from the memory 2 to the error correction coding circuit 5 so that the erroneous track is sequentially re-recorded.
The address of the memory 2 is output to the memory 2 so that Further, the controller 3 outputs the address of the memory 2 to the memory 2 so as to output the correct data of the track reproduced from the memory 2.

A block diagram of the modulation circuit 6 is shown in FIG. Here, 30 is an F0 modulation circuit, 31 is an F1 modulation circuit, 32
Is an F2 modulation circuit, and 33a and 33b are recording amplifiers. The odd-numbered track data 18a is input to the F0 modulation circuit 30 and is used as a recording signal for the head 7a. At this time F0
The modulation circuit performs modulation so that the track to be recorded does not have a pilot tone. The data 19a on the even-numbered tracks includes the F1 track modulation circuit 31 and the F2 track modulation circuit 32.
Is input to The F1 track modulation circuit 31 modulates the input data 19a so that the track to be recorded has a pilot tone of frequency f1. The F2 track modulation circuit 32 modulates the input data 19a so that the track to be recorded has a pilot tone of frequency f2. The modulation signal modulated by the F1 modulation circuit 31 or the F2 modulation circuit 32 is converted into a recording signal by the recording amplifier 33d and output to the recording head 7b. The outputs of the F1 modulation circuit 31 and the F2 modulation circuit 32 are such that the even tracks to be recorded are alternately F
It is selected so that one track and F2 track are repeated, and is output to the recording head 7b.

A block diagram of the demodulation circuit 8 is shown in FIG. Here, 34 is a demodulation circuit, and 35 is an F0 track detection circuit. The reproduction signal of the reproduction head 9a is input to the F0 track detection circuit. The F0 track detection circuit detects a track according to the pilot tone, and if the head is displaced from the F0 track, it controls the servo circuit 17 to allow the recording head 9a to correctly reproduce the F0 track. The servo circuit 17 controls the motor so that the head 9a follows the F0 track according to the F0 track detection circuit. By controlling in this way, the head 9a moves to F
Only the 0th track is reproduced, and the head 9b alternately reproduces the F1 track and the F2 track.

FIG. 4 shows the track arrangement of the magnetic tape when there is no error. Here, 20 is a frame, and 21
Is a truck. The data input to the formatter is divided into frames. A frame is composed of 10 tracks and is sequentially recorded on the magnetic tape. At this time, in order to distinguish the frames, a frame number that circulates with 2 bits is added and recorded. Also, in order to distinguish the tracks, track pairs are recorded with track pair numbers starting from 0 and increasing by 1 for every 2 tracks.

The tracks are F0 track and F1 track.
The F0 track and the F2 track are recorded in this order, but the first track of the frame is always recorded as the F0 track.

FIG. 5 shows the structure of the sync block. The track pair number and the sequence number are recorded in the ID of the sync block in the track. The structure of the sync block is shown in FIG. Here, 51 is a sync pattern, 5
2 is an ID field in which ID and ID parity are recorded, 53 is a data field in which data is recorded, 54
Is the inner parity.

The ID field 52 includes a frame number field 55 and a track pair number field 56.
The frame number field 55 has a width of 2 bits and records a frame number. Further, the track pair number field 56 has a width of 4 bits and records a track pair number which is incremented by two when the recorded track is correct.

FIG. 6 shows the head arrangement of this embodiment. Here, 25 is a cylinder. Two recording heads 7 and two reproducing heads 9 are attached to the cylinder facing each other by 180 degrees, and the magnetic tape 8 is wound around the cylinder 25 by about 180 degrees. Therefore, cylinder 2
Two tracks are recorded by the recording head 7 in the half rotation of 5, and two tracks are reproduced by the reproducing head 9 in the next half rotation.

When tracks are recorded using a cylinder having such a head arrangement, two tracks are simultaneously recorded.
This is recorded or reproduced. Recording and reproduction are repeated every half rotation of the cylinder 25. After the track has been recorded, the recorded track is played back, and it is judged whether the track was recorded correctly, and when it is judged that it was not recorded correctly, it is re-recorded from the track which was judged not to be recorded correctly. It

When all the recorded heads are correct, the order of recording or reproducing is as shown in (Table 1). As shown in (Table 1), when a track is recorded at time m, the track is reproduced at time m + 2 and it is judged whether it is correct or not. Here, the time required for half rotation of the cylinder 25 is set to time 1.

[0040]

[Table 1]

When it is judged by the judgment circuit 4 that there are many errors in the recorded tracks, the track of the track pair number of that track is re-recorded and the tracks after the one judged to be incorrect are re-recorded.

Table 2 shows the order in which the judgment circuit 4 judges that one of the tracks of the track pair number 1 of the frame 2 has many errors. When a track is determined to be incorrect, the track that was determined to be incorrect is re-recorded, but all tracks that were recorded from the time when the incorrect track was first recorded to the time when the incorrect track was re-recorded are re-recorded. It

In Table 2, first, frame number 2
Frame number 2 Track pair number 2 track is recorded from recording to reproduction of track pair number 1, Frame number 2 Track pair number 2 frame is recorded from reproduction to re-recording Number 2 Track pair number 3 is recorded. for that reason,
After re-recording the track of frame number 2 track pair number 1, the tracks of frame number 2 track pair number 2 and frame number 2 track pair number 3 are also re-recorded. The track arrangement at this time is shown in FIG.

[0044]

[Table 2]

Further, (Table 3) shows the recording order when the track of the frame 1 track pair number 4 is erroneous.

Depending on the tracks determined to be incorrect in this way, tracks with different frame numbers may coexist. The track arrangement at this time is shown in FIG.

[0047]

[Table 3]

When no track is recorded due to head clogs or the like, the previously recorded track remains without being overwritten. Therefore, at the time of reproduction, the previously recorded track may be reproduced. This time,
Depending on the reproduced data, there is a possibility that the data in the normal track of the memory 2 may be overwritten and erased. This is because it is not known whether the data is correct or incorrect during reproduction. Therefore, the judging circuit 4 compares the reproduced data with the recorded data or judges from the frame number of the reproduced track and the track pair number whether or not the track is not recorded. When the track is not recorded, the controller 3 controls the address of the memory 2 so that all the frames are re-recorded.

The arrangement of the tracks at this time is shown in FIG. In the frame of frame number 2, it is assumed that the track of track pair number 2 is not recorded and the track of track pair number 0 is previously recorded. After recording the track of track 3, the track of track 2 is reproduced and the judgment circuit 4 judges whether the track is correct. At this time, when it is determined that the track of track 2 is not recorded, the entire frame is re-recorded from there. This means that when the track of track 0 was previously recorded at the position of the unrecorded track, the track having this track pair number 0 is reproduced at the time of reproduction, but at the time of reproduction, this track was recorded by re-recording. This is because it is not possible to know whether the old track was played because the track could not be recorded.

FIG. 10 is a track layout diagram when the same track is not recorded. Here, it is assumed that the track of frame number 2 and track pair number 1 is not recorded, and the track of frame number 1 and track pair number 4 is previously recorded therein. At this time, after recording the track of track pair number 2, the track of track pair number 1 is reproduced, and the judgment circuit 4 judges whether or not the track is correct. At this time, track pair number 1
When it is determined that the track is not recorded, the entire frame of the previous frame is re-recorded from that.

That is, when the judgment circuit 4 judges that the track is not recorded, the controller 3 re-records the entire frame before that when the track pair number which should have been recorded is 0 to 1, and otherwise. If the track pair number is, the entire frame is re-recorded.

In this way, the recording head 7a always records the F0 track, the recording head 7b reproduces the F1 track or the F2 track, the reproducing head 9a always reproduces the F0 track, and the reproducing head 9b reproduces the F1 track or the F1 track. In order to reproduce, the modulation circuit 6 does not need to prepare a circuit for modulating three types of tracks for each head. Therefore, the structure of the modulation circuit 6 is simplified. Further, since the head for reproducing the F0 track is fixed to the reproducing head 9a, only one F0 track detecting device is required and the structure of the demodulation circuit 10 is also simplified.

Then, by re-recording when the track recorded with the F0 track and the F1 track or the F0 track and the F1 track as a unit is not correct, the circuit configuration of the modulation circuit 6 is simplified and the pilot pattern is regulated. It is possible to protect and record the track.

Further, by determining a track with many errors and re-recording, the redundancy at the time of re-recording is reduced and the consumption of the magnetic tape is suppressed as compared with the case of re-recording in frame units, and the first recording is performed. Recording can be performed using the same recording head at the time of recording and at the time of re-recording. By using the same recording head, the bit width of the address representing the track can be reduced and the address management of the memory can be simplified.

In the present embodiment, when it is determined that the recorded track is not correct, it is re-recorded after two sets of tracks have been recorded. When it is difficult to reproduce the track before the track recorded above, it is possible that more tracks are recorded or only one set of tracks is recorded. The effect of the present invention can be obtained by re-recording including the recorded track between the re-recorded tracks.

By using a track pair number that increases in two tracks as a number indicating a track, it is possible to have the same sync block structure as a home digital VTR and share a circuit with the digital VTR. Is possible.

In this embodiment, one frame is composed of 10 tracks, but the present invention can be applied even if one frame is composed of 12 tracks or an arbitrary natural number of tracks.

In the present embodiment, whether or not the recorded track is correct is determined by comparing the error correction decoding flag and the reproduced track data with the recorded track data. However, CRC (Cyclic Redundancy) of the reproduced data is determined. c
It is also possible to judge whether or not the recorded track is correct by using (ode) or the like.

In this embodiment, two heads are arranged.
Although one head is arranged at a position facing each other by 180 °, the effect of the present invention can be obtained even if the heads are arranged at other positions, for example, at positions separated by 90 ° on the cylinder.

In the present embodiment, the F1 modulation circuit 32 and the F2 modulation circuit 33 modulate so that the track has a pilot tone, but the same effect can be obtained even if the pilot tone is superimposed.

The second embodiment will be described below. First
In the recording apparatus of the above embodiment, the memory 2 stores the data from the formatter and outputs the data of different tracks to the error correction circuit 5 and the judgment circuit 4. Therefore, it is necessary to output a large amount of data in a short period of time.

FIG. 11 is a block diagram of the second embodiment of the present invention. Here, 12 is a memory, 13 is a memory, 14
Is the controller.

The input data is input to the formatter 1, formatted into 10-track data, and output to the memory 13. The memory 13 stores the data to be recorded and outputs it to the error correction coding circuit 5. The error correction coding circuit 5 performs error correction coding on the input data,
The parity is added and output to the modulation circuit 6. Modulation circuit 6
Then, a sync pattern, which is a mark for demodulation at the time of reproduction, is added to the input data and parity, modulation is performed, and the data is output to the recording heads 7a and 7b to record a track on the magnetic tape 8.

The data output from the memory 13 to the error correction coding circuit 5 is also output to the memory 12. This data is delayed by the memory 12 and output to the judgment circuit 4. At the time of recording, recording is performed in the same manner as in the first embodiment. Similarly, the tracks recorded on the magnetic tape 8 are reproduced by the reproducing heads 9a and 9b, the reproduced signal is demodulated by the demodulation circuit 10, and the error correction decoding circuit 11 is used. Then, the error is corrected and output to the decision circuit 4.

The decision circuit 4 demodulates the reproduced track and the error correction / decoding flag and error-corrected data 18b.
And 19b are input from the error correction decoding circuit 11 and the recorded data 1 delayed from the memory 12
Enter 8c and 19c. The judgment circuit 4 uses the data 1
8b and the data 18c are compared with each other, and the data 19b and the data 19c are compared with each other, and when it is determined that there are many errors, the controller 3 is notified that an error has occurred.

The controller 14 outputs the address of the memory 13 to the memory 13 so that the formatted data is sequentially output from the memory 13 to the error correction coding circuit 5 when the recorded track is not wrong, and the recorded track is correct. When the judgment circuit 4 judges that there is not, the address of the memory 13 is outputted to the memory 13 so that the data to be re-recorded so as to be re-recorded sequentially from the erroneous track is outputted from the memory 13 to the error correction coding circuit 5.

The controller 14 also outputs the address of the memory 14 to the memory 14 so that the correct data of the track reproduced from the memory 13 is output.

By delaying the output of the memory 13 by the memory 12 once in this way, it becomes possible to reduce the frequency of memory access in addition to the advantages of the recording apparatus of the first embodiment.

The third embodiment will be described below. FIG.
2 is a block diagram of the reproducing apparatus of the present invention. Where 4
1 is a deformatter, 42 is a memory, 44 is a judgment circuit,
Reference numeral 45 is a memory, 11 is an error correction decoding circuit, 10 is a demodulation circuit, 9a and 9b are reproducing heads, and 8 is a magnetic tape.

The reproducing head 9 reproduces a track from the magnetic tape 8 and outputs a reproduced signal to the demodulation circuit 10. The demodulation circuit 10 demodulates the reproduced signal and outputs it to the error correction decoding circuit 11. The error correction decoding circuit 11 performs error correction on the reproduced data using the parity added at the time of recording. The error-corrected data is output to the memory 42 and the judgment circuit 44. The judgment circuit 44 judges whether the reproduced track is judged to be correct or not at the time of recording, and outputs the result to the controller 43. When it is determined that the data stored in the memory 42 is the correct track during recording, the controller 43 outputs the data of the track stored in the memory 42 to the deformatter. The deformatter reversely rearranges the data formatted into tracks and frames and outputs the data.

The judgment circuit 44 judges whether the reproduced track is judged to be correct or not at the time of recording as follows.

The incorrect track is re-recorded at the time of recording. Therefore, it is possible to determine that a track that has not been re-recorded at the time of recording was determined to be a correct track at the time of recording.

In the magnetic tape 8 recorded by the recording apparatus in the first embodiment, another track is recorded three times between the rerecorded track and the incorrect track. Therefore, if a track reproduced four times later is not the same frame number or the same track pair number, it is determined that the track has not been re-recorded, that is, the track is determined to be correct. can do.

In the track arrangement of FIG. 4, the tracks are reproduced by the reproducing head 9 in the order of track pair numbers 0, 1, 2. The reproduced signal reproduced is demodulated by the demodulation circuit 10 and error-correction decoded by the error-correction decoding circuit 11. The error-correction-decoded track data is output to and stored in the memory 42, and is also output to the determination circuit 44. The judgment circuit 44 stores the frame number and track pair number of the input track in the memory 45. Then, if the frame number and track pair number of the reproduced track four times before stored in the memory 45 are different from the frame number and track pair number of the input track, the reproduced track four times before is recorded. It is determined that it is correct, and the controller 43 is notified that it was determined to be correct at the time of recording. Also,
If the frame number and track pair number of the tracks 3 and 4 tracks before stored in the memory 45 are the same as the frame number and track pair number of the input track, the tracks reproduced 3 and 4 tracks before are recorded. Sometimes it is judged to be incorrect, and the controller 43
Communicate to the company that it was judged to be incorrect during recording.

When it is determined that the track is not correct at the time of recording, the controller 43 discards the data of the corresponding track. This records the data of the newly reproduced track in the memory space of the track which is judged to be incorrect at the time of recording in the memory 43.
By doing so, the incorrect track data is overwritten by the data having the same frame number and track pair number.

When it is determined that all the tracks forming the frame are correct at the time of recording, the address is controlled so that the data forming the frame stored in the memory 42 is output to the deformatter 41. Then, the deformatter 41 reformats the frame and outputs the data.

Further, the judgment circuit 44 can also judge whether the reproduced track is judged to be correct or not at the time of recording by the following method.
The incorrect track was re-recorded at the time of recording. Therefore, it is possible to determine that a track that has not been re-recorded at the time of recording was determined to be a correct track at the time of recording. At the time of re-recording, another track is recorded three times between the track determined to be incorrect and the re-recorded track. Therefore, it can be determined that the track reproduced four times before is correct when the track is recorded when the frame number and the track pair number are different from the track reproduced four times before. Therefore, when the track of track pair number 3 of the next frame is reproduced, it can be determined that all the tracks of the frame are correct. for that reason,
The judging circuit 44 judges that the frame is composed of the track judged to be correct at the time of recording when the track having the frame number different from that of the frame and the track pair number of 3 is reproduced, and transmits it to the controller 43. The controller 42 stores the data of the corresponding frame in the memory 4
The address of the memory 42 is controlled so that the data is output from the 2 to the deformatter 41. At this time, the judgment circuit 44 does not need to store the track pair number and the frame number in order to judge whether or not the data is judged to be correct at the time of recording in frame units. Also, the track data is output to the memory 42. However, if there is track data with the same track pair number and the same frame number at this time, the data of the newly reproduced track in the same memory space when stored in the memory 42. The data is stored.

In the present embodiment, the judging circuit 44 judges that the track is correctly recorded at the time of recording if the track pair number and frame number are different from the track reproduced four times before and the track pair number and frame number. However, when another track is recorded n times between the track judged to be incorrect at the time of recording and the track re-recorded thereafter, the track pair number and frame number of the track reproduced n + 1 times before are compared. By determining whether or not the track was determined to be correct during recording, it is possible to determine whether there is any other track between the track determined to be incorrect during recording and the track re-recorded thereafter. be able to.

In this embodiment, when the track pair number 3 of the next frame is reproduced, the judgment circuit 44 judges that the frame is a frame which was correctly recorded at the time of recording. N between the track determined not to exist and the track re-recorded thereafter
N of the next frame when another track is recorded
By determining that the frame is correct at the time of recording when the track with the track pair number of is recorded, any other track exists between the track that was determined to be incorrect at the time of recording and the track that was subsequently re-recorded. You can still judge.

In this way, whether or not the track is correct at the time of recording is determined by using the F0 track and the F1 track continuously recorded after the F0 track, or the F0 track and the F2 track continuously recorded after the F0 track as a unit. Since the F0 track detection circuit only needs to detect the F0 track from the output of the head 9b when reproducing the magnetic tape which has been judged and re-recorded, the structure of the demodulation circuit is simplified.

In the present embodiment, two tracks are recorded and reproduced at the same time. However, even when one track or a plurality of tracks are recorded or reproduced at the same time, whether the tracks are correct on the basis of the number of tracks to be recorded at the same time. It is possible to judge whether it is incorrect.

[Brief description of drawings]

FIG. 1 is a block diagram of a data recording / reproducing apparatus in a first embodiment of the first present invention.

FIG. 2 is a block diagram of a modulation circuit in the first embodiment of the first present invention.

FIG. 3 is a block diagram of a demodulation circuit in the first embodiment of the first present invention.

FIG. 4 is a layout view of tracks in the first embodiment of the first invention.

FIG. 5 is a configuration diagram of a sync block in the first embodiment of the first present invention.

FIG. 6 is a layout diagram of a head and a cylinder in the first embodiment of the first invention.

FIG. 7 is a layout view of tracks when the tracks are incorrect in the first embodiment of the first invention.

FIG. 8 is a layout view of tracks when the tracks are incorrect in the first embodiment of the first invention.

FIG. 9 is a layout view of tracks when the tracks are incorrect in the first embodiment of the first invention.

FIG. 10 is a layout view of tracks when the track is incorrect in the first embodiment of the first invention.

FIG. 11 is a block diagram of a data recording / reproducing apparatus in a second embodiment of the first present invention.

FIG. 12 is a block diagram of a data reproducing device according to a third embodiment of the second invention.

FIG. 13 is a block diagram of a data recording / reproducing apparatus in a third embodiment of the third invention.

FIG. 14 is a block diagram of a modulation circuit in a third embodiment of the present invention.

FIG. 15 is a block diagram of a demodulation circuit according to a third embodiment of the present invention.

FIG. 16 is a conventional track pattern diagram.

FIG. 17 is a conventional frame layout diagram.

FIG. 18 is a frame layout diagram when the conventional frame is incorrect.

[Explanation of symbols]

 1 Formatter 2 Memory 3 Controller 4 Judgment Circuit 5 Error Correction Encoding Circuit 6 Modulation Circuit 7 Recording Head 8 Magnetic Tape 9 Playback Head 10 Demodulation Circuit 11 Error Correction Decoding Circuit

Claims (21)

[Claims] 1. Formatting means for formatting input data into a format in units of frames, means for recording the output of the formatting means on a magnetic tape as n tracks, and reproduction from the magnetic tape. Instructing the formatting means to judge whether the output of the reproducing means is correctly recorded based on the information of the formatting means, and to re-record the track when the reproduced track is not correctly recorded. In the data recording apparatus, the data recording apparatus is provided with a determining means for determining whether or not the data is correctly recorded in units of i tracks. 2. The formatting means starts re-recording of an error track determined not to be correctly recorded after recording ixm tracks from the i error tracks. Claim 1
The described data reproducing device. 3. The error track judged by the formatting means to have many errors among the error tracks judged not to be correctly recorded by the judging means, and the error track judged by the formatting means to have many errors. For the track that was judged to have not been recorded at the time of re-recording from the above, the formatting means is the frame before the track judged not to be recorded or the entire frame including the track judged not to be recorded. 3. The data recording device according to claim 2, wherein the data is recorded again. 4. The recording means records a frame number indicating the frame number and a track number indicating the track number in the frame together with the track on the magnetic tape. Data recorder. 5. The F1 recording means for recording an F2 track having a pilot tone of frequency f2,
F1 recording means for recording an F2 track having a pilot tone of frequency f2 and an F1 recording means having no pilot tone
An F0 recording unit for recording 0 track is provided, and when recording a track, the tracks are sequentially recorded so that the track order is the first F0 track, the F1 track, the second F0 track, and the F2 track. The data recording device according to claim 4. 6. The judging means judges whether or not the data has been correctly recorded in units of the F0 track and the F1 track recorded subsequently to the F0 track, and further, the second F0 track and the second F0 track. 6. The data recording apparatus according to claim 5, wherein it is determined whether or not the data is correctly recorded in units of the F2 track which is recorded subsequently. 7. The recording means records the frame number representing the frame number and the track number representing the track number in the frame together with the track on the magnetic tape. Data recorder. 8. The data recording device according to claim 4, wherein n is 10 and i is 2. 9. The data recording device according to claim 4, wherein n is 12 and i is 2. 10. Formatting data on a frame-by-frame basis, recording the formatted data as n tracks, and further re-correcting the error tracks for error tracks determined not to be correctly recorded at the time of recording. Reproducing means for reproducing a signal from the recorded magnetic tape, judging means for judging whether or not the track reproduced by the reproducing means is the error track, and data obtained by deformatting the data output from the reproducing means. A data reproducing apparatus provided with a deformatting means, wherein the judging means judges whether or not the error track is the unit of i tracks. 11. The reproducing means formats the data into a format in which a frame is a unit, and records the formatted data as n tracks.
Further, with respect to an error track which is determined not to be correctly recorded at the time of recording in units of i tracks, data is reproduced from the magnetic tape for which re-recording is started after recording the ixm tracks from the i error tracks. The data reproducing device according to claim 10, wherein 12. The reproducing means formats the data into a format having a frame as a unit, and records the formatted data as n tracks.
An error track in which the frame number given to each frame and the track number given to each track in the frame are simultaneously recorded on the track, and further it is determined that the i-track is not correctly recorded at the time of recording , From the i erroneous tracks i
The data is reproduced from the magnetic tape whose recording has been started after the recording of xm tracks, and the judgment means is the track in which the frame number and the track number in the track reproduced by the reproduction means are reproduced. 12. The data reproducing apparatus according to claim 11, wherein the reproduced track is determined not to be the error track when the frame number and the track number of the track reproduced ixm times before are different from each other. . 13. The reproducing means includes an F0 track detecting means for detecting an F0 track having no pilot tone, a first demodulating means for demodulating an F0 track detected by the F0 track detecting means, an F1 track or an F2 track.
13. The data reproducing apparatus according to claim 12, further comprising second demodulating means for reproducing a track. 14. The judgment means comprises an F0 track and the F0 track.
It is determined whether or not the error track is the F1 track recorded subsequently to the track, and the second F
14. The data recording apparatus according to claim 13, wherein it is determined whether or not the track is an error track, with 0 track and an F2 track recorded subsequently to the second F0 track as a unit. 15. The data reproducing apparatus according to claim 14, wherein n is 10 and i is 2. 16. The data reproducing apparatus according to claim 14, wherein n is 12 and i is 2. 17. The reproducing means formats the data into a format in which a frame is a unit, and records the formatted data as n tracks.
The frame number given to each frame and the track number given to each track in the frame are simultaneously recorded on the track, and the error track is judged not to be correctly recorded at the time of recording in units of i tracks. , From the i erroneous tracks i
The data is reproduced from the magnetic tape whose recording is started after recording xm of the tracks, and the judging means reproduces the track recorded by the reproducing means at the ixmth track in the frame. 12. The data reproducing apparatus according to claim 11, wherein it is determined that the track of the frame before the frame is not the error track. 18. The reproducing means includes an F0 track detecting means for detecting an F0 track having no pilot tone, a first demodulating means for demodulating an F0 track detected by the F0 track detecting means, and an F1 track or F2 track.
18. The data reproducing apparatus according to claim 17, further comprising second demodulating means for reproducing a track. 19. The determination means is an F0 track and the F0 track.
It is determined whether or not the error track is the F1 track recorded subsequently to the track, and the second F
19. The data recording apparatus according to claim 18, wherein it is determined whether the error track is the 0th track and the F2 track recorded subsequently to the second F0 track as a unit. 20. The data reproducing apparatus according to claim 18, wherein n is 10 and i is 2. 21. The data reproducing apparatus according to claim 18, wherein n is 12 and i is 2.