JPH02179973A - Data recording/reproducing device - Google Patents

Abstract

PURPOSE:To enable the data recording/reproducing with high reliability by rerecording a data detected with an error and one or plural data recorded just before the data to a recording medium when the occurrence of the error at the time of recording the data is detected during the recording operation. CONSTITUTION:In using a digital audio tape recorder (R-DAT) as an auxiliary storage device for an external computer 16, when an error of a data D2 to be generated due to a defective part 14a of a magnetic tape 14 is detected during the recording time, a data D1 recorded just before the data D2 is also rerecorded. Consequently, when the defective part 14a is expanded due to a change with lapse of time or a repetition of a reproducing operation, and hence the data D1 of a frame F1 cannot be reproduced, the data D1 of a frame F7 can be reproduced instead. By this method, the data recording/reproducing with high reliability can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to data recording/reproducing equipment such as a rotary head type digital audio recorder (hereinafter referred to as R, DAT) capable of recording/reproducing digital signals. Regarding a playback device.

Conventional technology Traditionally, magnetic recording devices such as R-DAT have been used.
When recording digital signals on a medium at high density, error correction information (parity check code) is added so that even if some data is lost during playback, the original data can be reproduced by correction. There is a magnetic recording/reproducing device. Although small-scale data loss can be completely corrected with this type of device, for example, when a 1gJ magnetic tape has so-called scratches over a wide area,
, 1, etc. When a data writing error occurs and a large-scale data loss occurs, the original data cannot be reproduced.

When using such a magnetic recording/reproducing device as an auxiliary storage device in a computer, for example, it is necessary to check the recording state of data after writing the data in order to detect such problems. For this purpose, for example, after writing is completed, the magnetic tape is rewound to the recording start position for i1 verification, and the magnetic tape is run at the same speed as when recording to reproduce the written data and perform a parity check. There is. In such a method, if an error occurs in the reproduced data due to a defect in the recording medium, and the error cannot be corrected, the data must be written again, which requires a long time to record the data. .

In addition, a writing head and a reading head are provided separately,
Immediately after data is written by the write head, the read head reproduces the data written on the magnetic recording medium,
There are also magnetic recording/reproducing devices that improve recording reliability by f) methods such as comparing with original data. In such a magnetic recording/reproducing apparatus, the reliability of recording is improved by inspecting the recording state using a method such as the comparison described above, detecting a writing error, and performing writing again.

Problems to be Solved by the Invention FIG. 4 is a diagram showing a recording pattern of a magnetic tape 21 on which data is recorded by the above-mentioned magnetic recording/reproducing apparatus. The magnetic tape 21 is run in the direction of the arrow 23, and the data Di (i=1.2...) is expressed as Freno% F i
(i = 1.2, . . . ) are recorded sequentially.

At this time, since there is a defective part 22 such as a scratch on the magnetic tape 21, an error occurs in the data D2 of the frame F2.
If the error cannot be corrected, data D2 is re-recorded. By the time this error in data D2 is detected, the magnetic recording/playback device has data D6 in frame F6.
The recording up to this point has been performed, and data D2 and subsequent data are recorded again from frame F7 onwards.

At this time, the defective portion 22 may slightly overlap the frame F1. In this case, since the defective portion of frame F1 is a small head area, the error that occurs during error detection immediately after recording can be corrected.

When the magnetic tape 21 is played back multiple times, the recording state changes to N! due to abrasion on the surface of the recording medium. A, or the defective portion within the frame F1 expands, which may make it impossible to correct the error in the data D1 of the frame F1. At this point, the data D1 is not recorded in any other frame than the frame F1, and there is a problem in that it becomes impossible to reproduce the data D1.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a data recording/reproducing device that can record/reproduce data with high reliability.

Means for Solving the Problems The present invention provides recording means for recording data in each predetermined unit recording area of a recording medium, a reading means arranged close to the recording means for reading data immediately after recording, an error detection means for detecting an error in the read data based on the output of the reading means, and one or more adjacent unit records recorded prior to the unit recording area in which the error was detected by the error detection means. The data corresponding to a predetermined number of recording areas including the area is recorded on the recording medium after a predetermined number of unit recording areas have elapsed after the unit recording area where the error was detected. This is a data recording/playback device with special features.

According to the present invention, data is recorded on a recording medium by a recording means for each predetermined unit recording area, and the recorded data is read by a reading means immediately after being recorded by the recording means. The error detection means detects errors in the read data based on the output of the reading means. When an error is detected by the error detection means, the data recorded in a predetermined number of unit recording areas including one or more adjacent unit recording areas recorded prior to the unit recording area where the error was detected is , is recorded on the recording medium after a predetermined number of unit recording areas have elapsed after the unit recording area where the error was detected.

Therefore, since the recording means and the reading means are provided separately, the reading operation can be performed directly after the recording operation, and errors in recorded data can be immediately detected. Further, for 1% of recorded data in which an error is detected, the data in which the error was detected and one or more pieces of data recorded immediately before that data are re-recorded on the recording medium. Therefore, for example, if a defective part of the recording medium has expanded due to changes over time or repeated reading operations, and the data in the unit recording area adjacent to the defective part cannot be reproduced, it is necessary to reproduce the re-recorded data. good,
This allows the reliability of the data recording/reproducing device to be significantly improved.

Embodiment No. 111J is a block diagram showing the configuration of an embodiment of the present invention. In this embodiment, a rotary head type digital audio tape recorder (R-DAT) 1 is used as an auxiliary storage device of an external computer 16. are doing.

When data from external computer 16 is to be recorded on magnetic chip 114 , data from external computer 16 is provided to interface 2 via line 11 .

The data on line 11 is image information, audio information, arithmetic processing information on external computer 16, etc., and is an information unit for two tracks on magnetic tape 14 (described later).
Hereinafter, this information unit is referred to as a frame). One frame includes, for example, 5120 bytes of data, and is divided into frames by the external computer 16 and output.

Such data is passed from interface 2 to line 1.
2 to a memory 3 such as a random access memory, and is output to a signal processing circuit 7 via a line 13. Input/output operations in the interface 2 are performed by a control circuit 4 using a microcomputer, etc.
This is done according to control signals from.

Parity, freno, number, etc. in R-DAT are added to the data given to the signal processing circuit 7 via the line 13 from the interface 2, and the data with added parity etc. is sent to the amplifier 8 via the line 14. Given. The data signal amplified by the amplifier 8 is
A signal synchronized with the rotation of the rotary cylinder 9 from the synchronization circuit 13 sends a signal to the recording head W1 via the line 15.
The signal is also switched to the recording head W2 via the line 16 and recorded on the magnetic tape 14.

Such recording heads Wl, W2 and reproducing heads R1, R2, which will be described later, are fixed to a cylindrical rotary cylinder 9. The zero-rotation cylinder 9 is rotationally driven by a motor 6 in the direction indicated by an arrow 17 around its axis. Ru. At this time,
A servo circuit 5 controls the rotational speed of a motor 6 based on a control signal from a control circuit 4 . Further, the magnetic tape 14 is run in a direction indicated by an arrow 18 by a single-stan motor (not shown) or the like. The magnetic tape 14 is in contact with the side surface of the rotary cylinder 9 at an angle of, for example, 90°. The recording heads Wl and W2 trace the magnetic tape 14 in a diagonal direction as shown by the second [2I], thereby forming frames Fi (i=1.2, . . . ), respectively. A frame number, which is a sequential number, is recorded in each frame as identification information, and when the same data is recorded, the same frame number is recorded.

The data recorded on the magnetic tape 14 is transferred to the recording head Wl.
, W2 are switched and read out using the synchronization signal from the synchronization circuit 13, as in the case of writing described above. Signals from read heads R1 and R2 are applied to amplifier 10 via lines R7 and 18, respectively. At this time, playback R1
, R2 are individually corresponding recording heads W1, W2
Regenerate the data of the frames formed by the respective frames.

The data signal amplified by amplifier 10 is connected to line 19.
The signal is applied to the synchronization circuit 11 via the synchronization circuit 11, where it is synchronized with the clock signal from the clock generation circuit 15. Output from synchronous circuit 11 is line 110
The signal is applied to the signal processing circuit 12 via the signal processing circuit 12, where errors are corrected using the parity added by the signal processing circuit 7. At this time, signal processing such as error correction is performed by the synchronization circuit 13 synchronously with signal processing such as parity addition in the signal processing circuit 7.

The data output from the signal processing circuit 12 is
0 given to the aforementioned interface 2 via
Normally, the interface 2 stores data in a memory 3 via a line 12, and then reads the data 1 from the memory 3 and outputs it to an external computer 16.

FIG. 3 is a flowchart for explaining the recording operation in R-DATI.9 In this embodiment, the second
The data D2 of frame F2 shown in the figure is transferred to the magnetic tape 1.
Assume that an error occurs when recording in 4. Data D from the external computer 16 in step n1
i (i=1.2°...) is stored in the memory 3 and also provided to the signal processing circuit 7. At the step entrance 2, data D2 to which parity and the like are added in the signal processing circuit 7 is recorded on the magnetic tape 14. step n3
Then, the data D2 reproduced by the reproduction heads R1 and R2 is applied to the signal processing port f812, and the signal processing circuit 7 performs signal processing including data error correction using added parity. In step "14, data D2
It is determined whether the error can be corrected. Data D2
If it is possible to correct the error in 5, that is, the data D
If 2 is recorded, the process returns to step n1 and the next data is input.

When it is impossible to correct the error σ1 of the data D2, that is, as shown in the second diagram, it is impossible to correct the error of the data D2 of the frame F2 because there is a defective part 14a such as a scratch on the magnetic chip 114. If it is determined that there is, the process proceeds to step 5 and the input of data from the external computer 16 is stopped. At this time, at least the data D1 is stored in the memory 3.
~D6 is stored, and data D is also stored on the magnetic tape.
1 to D6 are recorded.

At step rr6, the data D1 immediately before the data D2 whose error cannot be corrected is read from the memory 3, and at step r17, the data D1 is rerecorded. In step n8, the signal processing circuit 12 performs signal processing including correction of errors in the data D1 using parity. Data D2 to D5 are sequentially read from the memory 3 and recorded in frames F8 to Fil, respectively.

In step rr9, it is determined whether errors in the re-recorded data D1 can be corrected. If the error cannot be corrected (j9+), return to step rI6 and re-record the data D1 again; if the error can be corrected (P4+), return to step n1 and input the next data from the external computer 16. let In this manner, when an error in recorded data cannot be corrected, data recorded immediately before that data is re-recorded.

According to this example, when using R-DATI as an auxiliary storage device for the external computer 16,
When an error in the data D2 caused by the defective portion 14a of the magnetic tape 14 is detected during recording, the data D1 recorded immediately before the data D2 is also re-recorded. Therefore, if the defective portion 14a expands due to changes over time or repeated playback operations and it is no longer possible to play back the data D1 of frame F1, it is sufficient to play back the data D1 of frame F7. Data record! −
/Playback can be performed.

In this embodiment, the re-recording is performed from the data D1, but the re-recording may be performed from the data recorded before the data D1.

When reproducing the magnetic tape 14 recorded in this way, the data for each reproduced frame is temporarily stored in the memory 3, and when outputting it, the frame number of the data to be output and the frame number of the data five times later are stored. , and the numbers, and if they are the same, the first data may not be output.

Further, since tracking control when reproducing the magnetic tape 14 is performed based on the reproduction signal, the defective portion 14
Disturbance occurs in tracking control when reproducing frames F2 to F5 including a.

It takes a certain period of time for this disturbance to recover, and there are four cases in which the data of frames played during that period are not correctly played back. In other words, since the data D1 of frame F7 etc. re-recorded on the magnetic chip 114 may not be reproduced correctly, re-recording may be performed multiple times.

Note that although this embodiment has been explained using R-DAT, it is not necessary to limit it to R-DAT.

For example, it can also be implemented in a storage device such as a cassette recorder or a video cassette recorder.

Effects of the Invention As described above, according to the present invention, since the recording means and the reading means are provided separately, it is possible to read the data immediately after recording from the recording medium during the data recording operation, thereby preventing errors during data recording. When the occurrence of an error is detected during a recording operation, the data in which the error was detected and one or more pieces of data recorded immediately before that data are re-recorded on the recording medium.

Thus, for example, the # of read operations or changes over time.
In cases where the defective part of the recording medium has expanded due to S return etc. and the data in the unit area adjacent to the defective part cannot be reproduced, it is sufficient to reproduce the re-recorded data.
This allows highly reliable data recording/reproduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an R-DATl according to an embodiment of the present invention, FIG. 2 is a diagram showing a recording pattern of the magnetic tape 14 on which data is recorded by the R-DATl, and 3I2I is a block diagram showing the basic configuration of an R-DATl according to an embodiment of the invention. - A flowchart for explaining the recording operation of DATI. FIG. 4 is a diagram showing a recording pattern of a magnetic tape 21 on which data is recorded by a conventional R-DAT. 1...RDAT, 2...Interface, 3...
- Memory, 4... Control circuit, 7.12... Signal processing circuit, 14... Magnetic tape, 16... External computer, Wl, W2... Recording head, R1, R2...
Playback Head Agent Patent Attorney Function Keiichi

Claims (1)

[Scope of Claims] Recording means for recording data in each predetermined unit recording area on a recording medium; reading means disposed close to the recording means for reading data immediately after recording; and based on the output of the reading means. and an error detection means for detecting an error in the read data, and includes one or more adjacent unit recording areas recorded prior to the unit recording area in which an error has been detected by the error detection means. A data recording method characterized in that data corresponding to a number of recording areas is recorded on a recording medium after a predetermined number of unit recording areas have elapsed after the unit recording area in which the error was detected. playback device.