JPH0581784A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce information in real time by comparing data receded on a magnetic tape with the data reproduced from the same position with the recoded data and writing an error detective signal on the part having a difference. CONSTITUTION:A data file stored on a memory 13 is sent to a recording signal processing circuit 10 through a data controller 12, after the data is converted to a signal form suitable for recording, the data is amplified by a recording amplifier 8 and recorded on the magnetic tape T by a magnetic head 7. By an error deciding circuit 14, both received signals are compared, when an error is detected, the error detective signal 15 is outputted, after the signal is amplified by the recording amplifier 4, the signal is recorded on an optional track OT by a recording fixed head 3. While the error detective signal 15 is reproduced, by a system controller 11, the operation of a reproduction process circuit 9 and a reproducing amplifier 6 are interrupted and the reproduction is interrupted temporarily, when the error detective signal 15 is disappeared, the reproducing operation is restarted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a digital audio tape so-called DAT.

[0002]

2. Description of the Related Art Conventionally, in a magnetic recording / reproducing apparatus utilizing DAT, various means have been considered as means for avoiding errors during recording and reproducing. Among them, there are a read-after-write method and a verify function in order to avoid a writing error during recording, that is, an error. That is, when the magnetic tape is damaged, it can be recovered by the error correction code at the time of reproducing the information, and at the time of recording, in order to avoid such a defective portion of the recording medium, it is checked whether or not the data is correctly recorded for each file. Generally, a verify function for performing reproduction and checking and a read-after-write method for checking for each track are performed.

[0003]

Since the conventional example is constructed as described above, the read-after-write method can monitor the recording signal in almost real time, but when the damaged portion of the tape is large, the number of damaged tracks is increased. Since the rewriting is performed for a long time, there is a drawback that the transfer rate of the entire system is temporarily reduced, and the method using the verify function has a problem that the recording signal cannot be monitored in real time.

The present invention has been made in order to solve the problems of the conventional example as described above. The damaged track position is always accurately detected and processed in real time to record and reproduce information. It is an object of the present invention to provide a magnetic recording / reproducing apparatus which can be performed extremely efficiently.

[0005]

Therefore, in a magnetic recording / reproducing apparatus according to the present invention, in a magnetic recording / reproducing apparatus for recording and reproducing information using a magnetic tape, the data recorded on the magnetic tape and this recording are recorded. Data comparing means for comparing the data reproduced from the same portion of the data and an abnormality detecting signal for detecting the difference between the data compared by the data comparing means and writing the abnormality detecting signal to a specific portion of the magnetic tape. Recording means, abnormality detection signal reproducing means for reproducing the abnormality detection signal, recording interruption means for temporarily interrupting processing and recording of data to be originally recorded during reproduction of the abnormality detection signal, and reproduction of the abnormality detection signal Is a reproduction interruption means for temporarily interrupting the processing and reproduction of the data to be reproduced originally, and a recovery means for returning to the original recording and reproduction operation upon completion of reproduction of the abnormality detection signal. By providing a means, it is intended to achieve the above object.

[0006]

In the magnetic recording / reproducing apparatus according to the present invention having the above-mentioned structure, the abnormal portion of the magnetic tape is detected by reproducing the abnormality detecting signal written on the tape before recording and reproducing the information, and the abnormality is detected. During the reproduction of the detection signal, the recording and reproduction data processing and the recording and reproduction are temporarily suspended, and when the reproduction of the abnormality detection signal is completed, the normal recording and reproduction operation is resumed to avoid the damaged portion of the magnetic tape. Efficient information recording and reproduction is performed in real time by excluding abnormal parts of the magnetic tape.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (Structure) FIG. 1 is a control block diagram of a magnetic recording / reproducing apparatus showing an embodiment of the present invention, FIG. 2 is a schematic diagram of the recording structure of the magnetic tape of the above embodiment, and FIG. FIG.

In FIG. 1, 1 is a reproducing fixed head, 2 is a reproducing amplifier for the reproducing fixed head 1, 3 is a recording fixed head,
4 is a recording amplifier for the recording fixed head 3 and 5 is a rotating drum D
, 6 is a reproduction amplifier for the rotary reproduction head 5, 7 is a rotary recording head provided on the rotary drum D, and 8 is a recording amplifier for the rotary recording head 7.
Reference numeral 9 is a digital signal processing circuit for reproduction and 10 is a digital signal processing circuit for recording.

Reference numeral 11 is a system controller for controlling the entire system, 12 is a data controller for processing data, 13 is a memory for storing the data sent from the data controller 13, and 14 is a comparison judgment of the difference between the two data. An error determination circuit, T is a magnetic tape (hereinafter referred to as a tape), and 15 is an abnormality detection signal output from the error determination circuit 14.

The error judgment circuit 14 functions as the data comparison means A, the fixed recording head 3 and the recording amplifier 4 function as the abnormality detection signal recording means B, and the fixed reproduction head 1 and the reproduction amplifier 2 function as the abnormality detection signal reproduction means C. Further, the system control 11 constitutes a recording interruption means D, a reproduction interruption means E and a recording and reproduction returning means F, respectively. O _T is a specific portion of the tape T, a so-called optional track, and M _T is a main track.

(Operation) The operation will be described based on the above configuration. First, the data file stored in the memory 13 is sent to the recording signal processing circuit 10 via the data controller 12, converted into a signal format suitable for recording, and then amplified by the recording amplifier 8 and then by the recording head 7. It is recorded on the magnetic tape T.

Next, at the time of reproduction, the signal reproduced by the reproducing head 5 is amplified by the reproducing amplifier 6 and then returned to the original format signal by the reproducing signal processing circuit 9 and stored in the memory 13 via the data controller 12. And saved. Here, in the case of the read-after-write method, the data controller 12 sends recording data to the recording signal processing circuit 10 and simultaneously transmits it to the error determination circuit 14 at the time of recording. Further, at the time of reproduction, the data from the reproduction signal processing circuit 9 is transmitted to the data controller 12 and at the same time,
It is also transmitted to the error determination circuit 14. Next, the error determination circuit 14 compares the received signals and, when it detects that there is an error, outputs an abnormality detection signal 15, which is amplified by the recording amplifier 4 and then is fixed by the recording fixed head 3 to the magnetic tape of FIG. recorded in the optional track O _T positioned outside the tape T shown in recording schematic structure of.

In FIG. 2, the X mark of the main track M _T indicates the track in which an error has occurred, and the Δ mark part of the optional track O _T is the abnormality detection signal 15 written in the above sequence. Then, at the time of the next recording, since the fixed reproducing head 1 is arranged prior to the rotary recording head 7 as shown in FIG. 3, the fixed head 1 reproduces the abnormality detection signal 15 written on the tape T. , When detected, the system controller 11 reads the signal 15 and the recording signal processing circuit 1 is operating during reproduction of the abnormality detection signal 15.
0 and the recording amplifier 8 are brought into a recording interruption state. Then, when the abnormality detection signal 15 is no longer reproduced, the recording signal processing is restarted.

In this way, when the written data is reproduced, the system controller 11 receives the reproduction signal of the reproduction fixed head 1 in the same manner, and the system controller 11 reproduces the reproduction signal processing circuit 9 and the reproduction amplifier 6 during the reproduction of the abnormality detection signal 15. The operation of is set to the reproduction interruption state, the reproduction is temporarily stopped, and the abnormality detection signal 15
The system controller 11 controls so that the reproduction operation is restarted when there is no more. In this way, information is recorded and reproduced appropriately and efficiently in real time, excluding the damaged area of the magnetic tape.

In this embodiment, the error avoidance by reproducing the abnormality detection signal at the time of recording and reproducing the data is explained, but it is not limited to this, and it goes without saying that the abnormality detection signal is useful even at the time of searching. Nor.

[0016]

As described above, according to the present invention, the data recorded on the magnetic tape is compared with the data reproduced from the same portion of the recorded data, and an abnormal portion is detected. The detection signal is written, and the abnormality detection signal is read before recording and reproducing information so that recording and reproduction can be performed by avoiding the abnormality detection signal detection part, thus simplifying the read-after-write sequence. Information can be efficiently recorded and reproduced in real time. As a result, it is possible to obtain a magnetic recording / reproducing apparatus which is extremely quick in responding to damage to the magnetic tape and has excellent performance.

[Brief description of drawings]

FIG. 1 is a control block diagram of a magnetic recording / reproducing apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of a recording configuration of the magnetic tape of the above embodiment.

FIG. 3 is an explanatory diagram of a main part configuration of a magnetic recording / reproducing apparatus of an example.

[Explanation of symbols]

 20 magnetic recording / reproducing apparatus A data comparing means B abnormality detection signal recording means C abnormality detection signal reproducing means D recording interruption means E reproduction interruption means F restoring means T magnetic tape

Front page continued (72) Inventor Toshiaki Nobumiya 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for recording and reproducing information using a magnetic tape, and a data comparing means for comparing data recorded on the magnetic tape with data reproduced from the same portion of the recorded data. An abnormality detection signal recording means for detecting a difference in the data compared by the data comparison means and writing an abnormality detection signal to a specific portion of the magnetic tape; and an abnormality detection signal reproducing means for reproducing the abnormality detection signal. A recording interruption means for temporarily interrupting the processing and recording of the originally recorded data during reproduction of the abnormality detection signal; and a reproduction interruption means for temporarily interrupting the processing and reproduction of the originally reproduced data during reproduction of the abnormality detection signal. A magnetic recording / reproducing apparatus comprising: return means for returning to the original recording and reproducing operations in response to the end of reproduction of the abnormality detection signal.