JPS59119508A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To ensure the effective recovery for a fault of a rotary head by recording and reproducing the information after selecting a desired rotary head from the position of the rotary head that is detected by a revolution detecting means of the rotary head. CONSTITUTION:For an upper control circuit 12, a rotary head that should perform a retry of error is set to a register 13 to be given as the revolving position of a rotor 3. While the position signals 21 given from the rotor 3 are successively counted by a head counter 14. A comparator 15 compares the contents of the register 13 with the count value of the counter 14. If a coincidence output is obtained at the comparator 15, both a motor driving circuit 17 and an R/W control circuit 16 are actuated. The circuit 17 drives a recording medium 1, and at the same time the circuit 16 records and reproduces the information when the rotary head selected previously is set opposite to the medium 1. In such a constitution, it is possible to perform the error retry processing with an optional rotary head.

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a rotary head type magnetic recording medium device WL, which is a magnetic recording medium that allows selection of a rotary head capable of recording/reproducing stripes on a desired magnetic recording medium. The present invention relates to a recording/reproducing device.

Technical Background> In general, a rotating head type magnetic recording/reproducing device is equipped with several rotating heads, and records/records information on a predetermined stripe by rotating the rotating heads and moving the recording medium. Perform playback.

<Prior art and problems> In a conventional rotary head type magnetic recording/reproducing device, when an error occurs in a certain stripe on a recording medium, an error retry is performed on the stripe where the error occurred. The error IJ) lie process is performed only by a predetermined rotating head.

In other words, since the rotary head is always rotating at a constant rotation speed, for example, when reproducing information using two rotary heads, the stripes of the magnetic recording medium are recorded/recorded by alternating the two rotary heads. For example, an error occurs in one stripe during playback. A rotating head facing this stripe performs a Scherrer retry process on the table.

Therefore, in the past, error retry processing was always performed only by rotating the stripe opposite to the stripe in which the error occurred.

In this case, for example, if the performance of this rotary head deteriorates or there is a problem, no matter how much error retry processing is performed on this rotary head, it will not be possible to recover from the error. There were drawbacks.

However, even in normal information recording/reproducing, there is a drawback that if one of the plurality of rotary heads breaks down, information recording/reproducing similarly becomes impossible.

<Object of the Invention> An object of the present invention is to provide a unique magnetic recording/reproducing device that eliminates the above-mentioned drawbacks. A magnetic recording/reproducing device that records/reproduces information using a rotary head equipped with a head, the device comprising a rotation detecting means for the rotary head, and detecting a desired position of the rotary head based on the position of the rotary head detected by the rotation detecting means. The system is designed to record and reproduce information by selecting the .

<Embodiments of the invention> The present invention will be explained below using the drawings.

FIG. 1 shows an embodiment of a rotating head type air crushing recording and reproducing apparatus according to the present invention.

In the figure, 1 is a recording medium (magnetic tape), 2 is a take-up reel, 3F, 10-ta, 4.4', 4"4 ttt
is a rotating head, 5 is a rotor motor, 6 is an encoder, 7
is data area, 8 is guide, 9.9'l-1: ID
and a servo area, 10 is a take-up motor, and 11 is an encoder.

Recording medium 1 is taken up by winding IJ+RU2 so as to be fed in the direction of the arrow.
Wind it up.

The take-up reel 2 is rotated by a take-up motor 10. Further, the rotation of this winding motor 10 is detected by an encoder 11.

Rotary heads 4.4', 4"4 /// are attached to the rotor 3, and are rotated by a motor 5 at a predetermined rotational speed. The rotation of the motor 5 is detected by an encoder.

In this state, by setting the rotations of the recording medium 1 and the rotor 3 in a predetermined correspondence relationship, data 7 and information on the data area are recorded/reproduced on the recording medium.

This state will be explained with reference to FIG. 2. In the case of information reproduction, the information in ID9 and data area 7 is reproduced by the head's manual power.

Further, the signal A is a signal indicating the origin obtained by the encoder 6. In the magnetic recording/reproducing apparatus shown in FIG. The signal A is obtained in the period obtained by

Further, the R/ID area signal is a signal indicating the ID area 7, and the R/DATA area is a signal indicating the data area 9.

Next, FIG. 3 shows an embodiment of the magnetic recording/reproducing apparatus of the present invention.

In the figures, the same symbols as in Figure 1 indicate the same things,
Furthermore, in the figure, 12 is a host controller, 13 is a head N
0 storage register, 14 Herad counter, 15 comparison circuit, 16 R/W control circuit, 17 motor drive circuit, 1
8. 19 is an R/W circuit, 20 is a spool, and 21 is an origin signal and a rotor position signal, respectively.

The mechanical part of the magnetic recording/reproducing apparatus is composed of a spool 20 (tape reel), a rotor 3, and a take-up reel 2.

This spool 20 and two take-up reels motor drive circuit I
7! ll! The recording medium is driven at a predetermined constant speed.

On the other hand, although the rotor 3 is schematically shown in FIG. 3, it has a configuration as shown in FIG. 1.

The signal from the rotary head of this rotor 3 is R/W times mis.
, t9, respectively, and amplified.

On the other hand, a signal from rotor 3 indicates the origin of rotation (origin tacho in the figure).
A rotational position signal 21 is generated and manually inputted to the head counter 14.

In the head counter 14, while counting the rotor tacho, the head counter 14 is reset by the origin signal that is generated once per revolution. Ru.

Next, processing operations at the time of error retry will be explained.

In the upper control circuit 12, the rotary head to be subjected to the error retry is set in the register 13 so as to provide the rotational position of the rotor 3.

On the other hand, the position signal 21 from the rotor 3 is converted into a 11" primary counter 14, and the point at which the necessary rotating head faces the recording medium, that is, the contents of the register 13 and the head counter 14, is sent to the comparison circuit 15. As a result, the comparison circuit 15 obtains a matching output, so the motor drive circuit 17 and the R/W control circuit 16 are started, and the motor drive circuit 17 starts driving the recording medium 1. At the same time, the R/W control circuit 16 causes a preselected rotary head to face the medium, thereby recording/reproducing information.

With this configuration, the Sheller retry process can be performed using any rotary head.

Although error retry processing has been described in this embodiment, normal recording/reproduction can also be performed in the same way.

As described above, in the present invention, since it is possible to arbitrarily select a rotary head when recording/reproducing information, recovery can be performed effectively especially when a rotary head breaks down.

[Brief explanation of drawings]

FIG. 1 shows an example of a magnetic recording and reproducing device according to the present invention,
FIG. 2 shows signal waveforms at various parts in FIG. 1, and FIG. 3 shows an embodiment of the magnetic recording/reproducing apparatus of the present invention. In the figure, 1 is a recording medium (magnetic tape), 21 is a take-up reel, 3 is a rotor, 4, 4', 4'', 4#' are rotary heads, 5 is a rotor motor, 6 is an encoder, 7 is a data area, 8 is a guide, 9.9' is an ID and servo area, a helds taking motor, 11 is an encoder, 12
is a host controller, 13 is a register, 14 is a counter, 1
5 is a comparison circuit, 16 is an R/W control circuit, 17 is a motor drive circuit, 18.19 is a Yζ/W circuit, 20 is a spool,
21 indicates an origin signal and a rotor position signal, respectively.

Claims (1)

[Claims] Information is recorded by a rotating head equipped with multiple heads.
/ A magnetic recording and reproducing device for reproducing information, comprising a rotation detecting means for the rotary head, and selecting a desired rotary head from the position of the rotary head detected by the rotation detecting means to record and reproduce information. Magnetic recording and reproducing device 0 characterized by