JPH01140475A - Magnetic recording method - Google Patents

Abstract

PURPOSE:To simplify the construction of a rotation drum, to reduce troubles and to facilitate a production by enhancing the speed of a rotating head, repeating a recording and reproduction for every one track and discriminating the correction of recorded data and recording again. CONSTITUTION:The head A records the data on a tape at a position a1, the head A reproduces at a position a2, in this case, since a signal is recorded at the position a1, the head A outputs a reproduced signal. In such a way, the signal recorded at the position a1 is reproduced at the position a2 and the data of this reproduced signal is compared with the original data of the data recorded at the position a1 to discriminate the correction of the data. The head is similar thereto. When either one of the data recorded by the head A and the head B has an error, the same data is recorded again by the head A and the head B on a next track. Thereby, the structure of the rotating drum is simplified to facilitate the production and suppress the generation of the trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic recording method using a rotating head type magnetic recording/reproducing device as a data recorder.

<Prior art> In recent years, rotating head type magnetic recording and reproducing devices (for example, VTR,
Data recorders using DAT (DAT, etc.) are being used. When a VTR, DAT, or the like is used as a data recorder, there are many advantages such as large storage capacity, quick access, and easy recording and playback.

However, when used as a data recorder, the data must be played back after recording to confirm whether it has been recorded accurately. By increasing the number of heads to four, a method was adopted in which the head was divided into two for playback and one for recording.

<Problems to be Solved by the Invention> In the method of increasing the number of rotating heads described above, the structure of the rotating drum becomes complicated, and this tendency increases particularly as the drum diameter becomes smaller. Therefore, there are problems in that manufacturing is not easy and failures are more likely to occur.

Means for Solving Problems> The present invention provides a magnetic recording method for recording data using a rotating head type magnetic recording/reproducing device as a data recorder, in which the rotational speed of the rotating head is set to an odd number when not used as a data recorder. The recording and reproduction are repeated for each track, and it is determined whether the recorded data is correct or incorrect, and if the recording is incorrect, the recording is performed again.

<Operation> In the magnetic recording method according to the present invention, the speed of the rotary head is increased, recording and reproduction are repeated for each track, and recorded data is determined to be correct or incorrect and re-recorded.

<Example> FIG. 1 shows the recording pattern of the magnetic tape and the locus of the rotary head in the magnetic recording method of this example. FIG. 2 is a timing chart of the head switching signal and the output signal of the head amplifier.

In this embodiment, a case will be described in which a DAT is used and the rotational speed of the rotary drum is made three times the rotational speed during normal recording/reproduction, that is, when not used as a data recorder.

In FIG. 1, arrow t indicates the running direction of the magnetic tape, and arrow d indicates the rotating direction of the rotary head.

a and b indicate tracks on the magnetic tape, respectively.

First, head A records data on the tape at a position indicated by al. Head B then reproduces at the position indicated by bl, but in this case, since the azimuth angles are different, no reproduction signal is output. Next, head A plays back at position a2. In this case, since a signal is recorded at position al, head A outputs a reproduced signal. Next, head B records at position b2. In the case of DAT, recording patterns of adjacent trunks partially overlap.

In this way, the signal recorded at position al is reproduced at position a2. The data of this reproduced signal is compared with the original data of the data recorded at the position al to determine whether the data is correct or incorrect. The same applies to head B. If there is an error in the data recorded by either head A or head B, head A will record the same data again on the next track.
, head B.

If the rotational speed of the rotary head is increased by an even number times that of normal recording and reproduction, in the case of 2 heads, b will be placed at position a2 in Figure 1.
Therefore, recording and reproduction cannot be performed for each track.

<Effects of the Invention> As explained above, in the present invention, the speed of the rotating head is increased and recording and reproduction are repeated for each track to determine whether the recorded data is correct or not and to re-record the data. This makes it possible to record and play back, which is necessary for a data recorder, without increasing the number of heads. Therefore, the structure of the rotating drum does not become complicated.
Since the occurrence of failures can be reduced and manufacturing is easy, cost reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the recording pattern of a magnetic tape and the locus of a rotary head according to an embodiment of the present invention, and FIG. 2 is a timing chart of signals according to an embodiment of the present invention. a, b... Track h... Head rotation direction t... Tape running direction Patent applicant Sharp Corporation Agent Patent attorney Nishi 1) Shin

Claims (1)

[Claims] In a magnetic recording method in which data is recorded using a rotating head type magnetic recording/reproducing device as a data recorder, the rotational speed of the rotating head is set to an odd multiple of that when not used as a data recorder, and recording and reproduction are repeated for each track. A magnetic recording method characterized by determining whether the recorded data is correct or incorrect, and recording is performed again if the recording is incorrect.