JPH01232576A - Information recording method - Google Patents

Abstract

PURPOSE:To enhance the reliability of information recording by writing and storing information into a memory during a recording action, reading the written information, detecting an error, reading the erroneously written information from the memory and rewriting it. CONSTITUTION:The information to be recorded is written on a magnetic tape 14, and stored into a memory 3. When the information is recorded, the writing and reading are repeated with the use of reading heads R1 and R2 in addition to writing heads W1 and W2 of a rotary cylinder 9, and when the error of the read data is detected by a signal processing circuit 12 and the error cannot be corrected, a control circuit 4 sets a signal derived from an interface 2 to a line l13, for example, at a high level, stops the output of the data from an external computer 1, the data having the error are rewritten from the memory 3 on the magnetic tape 14, and the data are continuously written on the magnetic tape 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to cases where a magnetic recording and reproducing device such as a rotary head type digital audio tape recorder (abbreviated as R-DAT) is used as an auxiliary storage device for a computer, etc. The present invention relates to an information recording method suitably implemented.

2. Description of the Related Art In a conventional R-DAT, a rotating drum is equipped with two magnetic heads for both writing and reading.

Analog signals such as acoustic signals are transformed into digital signals.
a and then an error correction code called parity is added. Such signals are sequentially written onto the magnetic tape by the magnetic head 2-).

During playback, the signals written on the magnetic tape are read out sequentially by two magnetic heads, and errors in the signal are corrected using an error correction code added with C1, and if correction is not possible, the signal is corrected. A so-called interpolation is performed to create a normal signal from the signals before and after the impossible signal.

Thereafter, this signal is converted into, for example, an analog signal and output.

Problems to be Solved by the Invention When the conventional R-DAT is used as an auxiliary storage device for a computer, for example, the digital signal from the computer is directly recorded, so the interpolation method described above cannot be used. Therefore, it is not possible to obtain sufficient reliability in recording. For this reason, to check when writing is complete, the magnetic tape is rewound to the recording start position, the magnetic tape is run at the tape speed during recording, and the information written on the magnetic tape is reproduced to perform a parity check. ? 'There's a point.

Such a method requires a long time to record information.

Furthermore, if an error occurs, it is necessary to rewind the magnetic tape accurately to the position where the error occurred and write data again. For this reason, if information is written without the magnetic tape being rewound accurately to the position where the error occurred, the trunnion servo will be disturbed during playback and normal playback will no longer be possible. , less reliable.

An object of the present invention is to provide an information recording method that can solve the above problems, record information with high reliability, and improve convenience.

Means for Solving the Problems The present invention writes information to be recorded in units of information by a write head onto a recordable and reproducible recording medium, and during this recording operation, the information to be recorded is written onto the recording medium by the write head. The information written on the recording medium is read out by a read head, an error in the read information is detected by an error detection means, and an error is detected based on the detection result of the detection means. F) An information recording method characterized in that an information unit containing information written by mistake is read from a memory and written to a recording medium again by a write operation.

According to the present invention, information to be recorded is written in units of information by a write head on a recordable and reproducible recording medium and is stored in a memory. Information written on the recording medium is read out successively by a read head, and errors are detected by error detection means. Based on the detection result by the error detection means, the information unit containing the erroneously written information is read from the memory and written onto the recording medium again by the write head.

Therefore, since the write head and the read head are provided separately, the write and read operations can be carried out simultaneously, eliminating the need for operating time for verification as described in connection with the prior art, and furthermore, information can be If the information is written in error, it is configured to write the correct information to the recording medium again, so there is no need to return to the position on the recording medium where the error occurred, improving reliability. .

Embodiment No. 112I 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 is used as an auxiliary storage device for the external combiator 1.

When data from the external computer 1 is to be recorded on the magnetic tape 14, the data from the external computer 1 is provided to the interface 2 via the line 11. The data on line 11 is image information, audio information, arithmetic processing information on external computer 1, etc., and is transmitted in units of information for two tracks on magnetic tape 14 (hereinafter, this information unit is referred to as a frame). be done. One frame includes, for example, 5120 bytes of data, which is divided into frames by the external computer 1 and output.

In this embodiment, 17 rails are divided into a plurality of regions as shown in FIG. That is, for example, five data areas a'□e and this data area a'-
One frame is composed of parity areas F)2L to Pe that individually correspond to e. nif mentioned 5120
Byte data is divided and stored into data areas a to e, each having a data amount of 1024 bytes. The parity areas Pε1 to Pe each have, for example, 128 bytes of data, and each of the parity areas Pε1 to Pe has a data area of 2t.
It corresponds to the data of ~e. This parity area P a
□" P e data is added at the interface and used as an error correction code. In R-DAT, parity is also added during signal processing as described later, but the Due to the configuration of this section, even higher reliability can be obtained as an auxiliary storage device.

data like this is sent from interface 2 to line 12
is output to the memory 3 such as a random access memory through the line 13, and the 18th processing memory 7 is output through the line 13.
is output to. As shown in the third row, the memory 3 is divided into eight memory areas MO to M7, and each memory area MO to M7 stores data for one full-time period.

In the memory 3, data for one frame from the interface 2 is first stored in a storage area MO. At this time, the data in the storage area MO-M6 of memory 3 is 11117
The data are transferred to the next left storage areas M1 to M7, respectively. Furthermore, data in the storage area M7 is normally erased. For example, as shown in FIG. 3 (1), the memory area +4 M Q
Frame S '-,' N 4-7 to be described later in ~M7~
Frame number N+8. When data from N→-9 is input sequentially,
The memory 3 changes to the storage state shown in FIG. 3(2) and third [F(3)]. Input/output operations at the interface 2 are performed in accordance with control signals from a control circuit 4 implemented by a microcomputer or the like.

Parity is added to the data taken in from the interface 2 via the line e3 to the signal processing circuit 7 in a normal R-DAT, and the parity-added data is output to the amplifier 8 via the line 14. . The data signal amplified by the amplifier 8 is transferred to the line 1 by a signal synchronized with the rotation of the rotary cylinder 9 from the synchronization circuit 13.
5 to the writing pad W1, and to the writing pad W2 via the line r6, and written to the magnetic chip 7-14.

These write heads w 1 , w 2 and read heads R 1 , R 2 to be described later are fixed to a cylindrical rotating cylinder 9 .

FIG. 2 is a perspective view showing the structure of the rotating cylinder 9 and its vicinity. The rotary cylinder 9 is rotationally driven by the motor 6 around an axis in the direction indicated by an arrow 20 . At this time, a control signal from the control circuit 4 causes the servo circuit 5 to control the motor 6.
control the rotation speed of the

In addition, the magnetic tape 14 is driven by a capstan motor (f shown in the figure).
The vehicle is being driven in the direction indicated by the arrow 21. The magnetic tape 14 is in contact with the side surface of the rotary cylinder 9 at an angle A1. This angle A1 is, for example, 90°.

writing heads Wl, W2 and successive writing head R1;
R2 is provided on one diameter line of the side surface of the rotating cylinder 9, respectively. The writing head W1 and the reading head R1 corresponding to the writing head W1 are at an angle A in the radial direction.
2 and are also slightly offset in the axial direction. Angle A2 is, for example, 90°.

Such a writing head w1. w2 is magnetic chibuto 4
The upper surface is scanned diagonally as shown in FIG. 4 to form tracks A and Bf, respectively. The frame numbers mentioned above are in subcode order j or 16a.

It is recorded in part of 16b. The data written on the magnetic tape 14 is read out by the read heads R1 and R2, which individually correspond to the write heads W1 and W2, switched by a synchronization signal from the synchronization circuit 13, as in the case of writing described above. Signals from readout rads R,1, R2 are applied to amplifier 10 via lines 17 and 18, respectively.

At this time, the read heads R1, R2 individually write the tracks A formed by the corresponding write heads W1, W2.
, B, respectively.

The data signal amplified by amplifier 10 is connected to line 19.
is output to the synchronous circuit 11 via
At this point, synchronization with the clock signal from the tarlock generation circuit 15 is achieved. Output from synchronous circuit 11 is line 11
0 to 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.

Data output from the signal processing circuit 12 is on line 112.
Normally, the interface 2 stores data in the memory via the line 12, and then reads the data from the memory 3 and outputs it to the external computer 1.

FIG. 6 and FIG. 7 are a time chart and a flowchart for explaining the write operation of the configuration shown in FIG. The operation will be described below with reference to these figures. At step n1 in FIG. 7, data of frame numbers N+I (I=0.1, 2, . . . ) are sequentially output from the external computer 1.

At this time, the synchronization 1 signal shown in FIG. 6(1) is output from the synchronization circuit 13. The synchronization signal is a signal representing the rotation period of the rotary cylinder 9, and the data is taken in in synchronization with this synchronization signal. The data output from the external computer 1 is as shown in No. 6121(2).

At this time, the data of frame number N+I is
The time required to write to the interface circuit 2
The time required for the parity shown in FIG. 5 to be one frame is one frame for data to be taken into the memory 3. Therefore, the data outputted from the interface 2 to the signal processing circuit 7 is delayed by two frames than the data outputted from the external computer 1, as shown in FIG. 6(3).

Before the above-mentioned data is derived to the write heads Wl, W2, it takes one frame to be taken into the signal processing circuit 7, and the time required to add parity in the conventional rN-DAT. As a result, it takes 1 Freno, 1 minute. Therefore, the writing head Wl,
The data derived to W2 is delayed by a time corresponding to two frames further than the data output from the interface 2 to the signal processing circuit 7, as shown in FIG. 6 (4).

Furthermore, when data written on a magnetic tape is retrieved, it takes one frame's worth of time for it to be taken into the signal processing circuit 12 from the readout nodes R1 and rj2. It takes one frame of time to correct errors using parity in R-DAT and to detect errors in step r+2 in FIG. Therefore, the data output from the signal processing circuit 12 is delayed by six frames from the data output from the external computer 1, as shown in FIG. 6(5).

In step ri3 of FIG.
Returning to r1, the above-described write operation is performed for the data of the next frame number.

In this embodiment, refer to 'f't in FIG. 6(5).
Assume that an error occurs when writing data of frame number N+3 indicated by Ea onto the magnetic tape 14.

If this error is detected in the fZ signal processing circuit 12 and the error cannot be corrected, step [13
Then move on to step n4. The control circuit 4 is shown in Figure 6 (6).
From interface 2 to line e13 as shown in
For example, the signal derived from the external computer 1 is set to a high level, and the output of data from the external computer 1 is stopped. The stored state in memory 3 at this time is shown in FIG. 3 (5) b)
Ru. Thereafter, data is sequentially output from the memory 3 again from frame number N+3 (611Z(3)).

In this way, the process returns to the 713th step n1, and the data for 6 frames, including the data of the erroneous frame number Nmo3, is written onto the magnetic tape 14 again (L4 in FIG. 6).
'). If the data of memory 3 is outputted from memory 3 to frame number N4-8, and if error correction was possible up to the time when the data was output from memory 3, that is, if normal writing was performed, line 113f+ For example, the signal becomes a low level (FIG. 6 (6)), and the output from the computer 1 is restarted from frame number N+11, and normal writing is performed (60 (2)).

Therefore, when recording data, the rotating cylinder 9
By using the reading heads R1 and R2 without straddling the writing heads W1 and W, writing and reading are repeated, and data is written on the magnetic tape 14 without interruption. It will be done. At this time, even if a writing error occurs due to a scratch on the magnetic tape 14, for example,
While the rotary cylinder 9 is being driven to rotate, six frames of data including the erroneous data are again read from the memory 3 and written onto the magnetic tape 14.

No. 812I and No. 912I are time charts and flow charts for explaining the operation of reproducing data recorded on the magnetic tape 14 by the above-described operation. When sending the data on the magnetic tape 14 to the external computer 1, the data recorded on the magnetic tape 14 is sent to the read head R1°R2 of the rotary cylinder 9 as described above in step m1 in FIG. amplifier 1
0 is given to the signal processing circuit 12 via the synchronization circuit 11. In normal operation, the signal processing circuit 12 corrects errors and detects data with the same frame number in 12 (see the arrow) The data is sent to the circuit 2 and the memory 3. As shown in the third I21, the memory 3 is composed of 8 memory areas MO to M7, and data is sequentially written from the memory area MO for each frame as in the write operation. +i area M7 is sent out, and when data with the same frame number is not detected P4, the process returns to step rn1 from step m3 in FIG. 9, and data in area M7 is output to the external computer 1.

To explain in detail, in step m2 of FIG. Determine what is input to the processing circuit 12. 9th [2I Steps Pro 13
In the case where data of the same frame number is input for six frames, the data stored in the area M7 in the memory 3 is not output to the external computer 1. Therefore, the data with the writing error is transferred to the external computer 1.
will not be output.

For example, if an error occurs in the data of frame number N+3, the synchronization port F! ? Synchronization signal from 113 (
The data outputted from the seventh dots R1 and R2 for reading in synchronization with FIG. 8(1)) is shown in FIG. 8(2). Incorrect data indicated by 9 reference mark Eb? Including frame number N÷
Data from frame number 3 to frame number N+8 are recorded in duplicate on the magnetic tape 14 and are read out repeatedly.

When the data of the frame number Nmo3 with no errors is input to the memory 3, the storage area MO and the area M6 of the memory 3 are input.
The data of the same Freno and number N+3 is stored ((4) in FIG. 3). In such a case, the control circuit 4 stops sending data from the external computer 11\. However, data is sent out sequentially from the read heads R1 and R2, and the data in the memory 3 is sequentially shifted as shown in Figure 3, 5). When the state shown in FIG. 3(5) is reached, the output of data to the external computer 1 is resumed, and the data is sequentially output to the external computer 1 starting with the data of number Nmo 3, which has no errors in writing. Therefore, as a result, the eighth []
As shown in <3>, only error-free data will be output to the external computer 1.

In this way, in this embodiment, when the rotary digital audio chip recorder is used as an auxiliary storage device for the external computer 1, even if a writing error occurs during recording, it is possible to write again without stopping the magnetic tape 14. . Therefore, the tracking servo described in connection with the prior art is not disturbed, and recording reliability is improved. Moreover, during the recording operation, reading from the magnetic tape 14 is performed at the same time as writing to the magnetic tape 14,
Since errors can be detected, there is no need to spend time checking records. Furthermore, since error detection and rewriting are automatically performed during recording IF, operability and convenience are improved.

In addition, by using the memory 3 during playback, accurate data without writing errors can be sequentially output to the external computer 1 without outputting data of the same frame 11 number, and the auxiliary storage device has high reliability. It can be used as

Although the present invention has been described for the case where it is implemented in R-DAT, it is not necessary to limit it to R-DAT.
For example, it can also be implemented in connection with a storage device such as a cassette tape recorder or a video cassette tape recorder. Further, the magnetic medium may be a magnetic disk, a magnetic drum, or the like. Furthermore, the number of write heads and read heads may be one or more each.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, since the write head and the read head are provided separately, information written on the recording medium can be read out during the information recording process. It is possible to detect the occurrence of an error during writing of information during the recording operation and write the same information again. Therefore, it is possible to improve convenience and record information with high reliability.

[Brief explanation of the drawing]

No. 10 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing the configuration around the rotating cylinder 9 of the embodiment shown in FIG. Figure 412! is a diagram for explaining the storage contents of area MO-M7 at each operation time, 412! is a diagram showing the magnetic tape 14 on which data is recorded, 5th (2I is a diagram showing the content of one frame of data) Figures 6 and 7 are time charts and flowcharts for explaining the recording operation f? of the embodiment shown in the first figure, and Figures 8 and 9 are playback operations flE of the embodiment shown in the first figure. J) Time chart t-
JJ and flowchart. ■...External computer, 2...Interface,
3... Memory, 4... Control circuit, 7, 12... No. 13 processing circuit, 9... Rotating cylinder, 14 - Magnetic tape, MO~M7... Storage area agent Patent attorney Number of strokes Keiichifu jF ! 1 Figure 3■

Claims (1)

[Scope of Claims] Information to be recorded is written in units of information by a write head on a recording medium capable of recording and reproduction, and during this recording operation, information to be recorded is written on the recording medium by the write head and also stored in a memory. The information stored and written on the recording medium is read by a read head, an error in the read information is detected by an error detection means, and based on the detection result of the detection means, the information written in error is detected. An information recording method characterized in that an information unit containing the recorded information is read from a memory and written again onto a recording medium by a write head.