JPH07121807A - Recording system for helical track data - Google Patents

Abstract

PURPOSE:To prevent loss of recorded data caused by over sliding by providing a specific region for sliding a tape and a magnetic head on a tape and performing stop, standby and reversal of the tape in the region. CONSTITUTION:When data is recorded on a magnetic tape 1, first a linear track 2 is generated by using a linear track head. Information for finding a recording position of a magnetic tape is recorded in this linear track signal region 2. Next, specific data and recorded data are recorded in a helical track region 14 by a recording head. The specific data is periodically recorded in the helical track with a period 13, and controlled so that a recording and reproducing head is placed on this specific data track when servo system processing is per formed. By controlling like this manner, recorded data can be protected from variation of tension, a friction between the magnetic tape and the magnetic head and the like, an effect improving an error rate is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical track data recording system for a magnetic tape storage device capable of recording and reproducing on a helical track.

[0002]

2. Description of the Related Art As a device for writing data on a helical track, for example, a D2 format digital video tape recorder (hereinafter abbreviated as DVTR) is conceivable. In the DVTR, a technical report of the Institute of Television Engineers, ITEJ Technical Report Vol. 11 No.24
pp.13-18. As described in VR'87-30 (Oct, 1987), when the record data continues, the record data is continuously written in the helical track, and the helical track on the magnetic tape is All are filled with recorded data.

[0003]

In the DVTR, the tape tension is applied when the tape is stopped, that is, when the external operation is accepted, and when the rotary head is rotating, the tape can be moved to the tape running state at the fastest speed. It is obvious from the fact that the mechanical operation time until the tape tension is applied and the time until the rotational speed of the rotary head becomes stable can be saved. Short time to tape running leads to good responsiveness of the device. However, if this state (tape tension is applied and the rotating head is rotating) continues for a long time, the magnetic tape and the magnetic head are in contact with each other, and thus a sliding mark is formed on the magnetic tape due to friction. As mentioned above, in the conventional recording method, since the recorded data is written on the entire surface of the helical track, it is on the recorded data when stopped on the recorded tape, and the recorded data cannot be read normally and the error rate may decrease. There is.

If the tape running state control (tape running → stopping, running direction reversal, etc.) is repeated at the same location on the tape, excessive tension fluctuations are applied to the tape, causing the tape to twist and recording. Data may not be read normally and the error rate may decrease.

It is an object of the present invention to protect recorded data from the friction between the magnetic tape and the magnetic head and excessive tension fluctuation.

[0006]

In order to achieve the above object, certain specific data is written in an arbitrary number of helical tracks and then recording data is written in the helical track, and a tape is written on the specific data of this helical track. A stop state (external operation acceptance state) or tape running state control (running direction reversal, etc.) is performed.

Further, after the recording data has been written to the helical track, the specified data is written to the entire arbitrary number of helical tracks, and the tape stopped state (external operation acceptance state) or the tape running on the specified data of the helical track. State control (reversal of traveling direction, etc.) is performed.

Further, certain data is periodically written over an arbitrary number of helical tracks, and a tape stop state (external operation acceptance state) or tape running state control (reverse running direction, etc.) is performed on the particular data of this helical track. Is to be carried out.

In addition, in response to a request for writing specific data from the central processing unit, certain specific data is written over an arbitrary number of helical tracks, and a tape stop state (external operation acceptance state) is set on the specific data of this helical track. The tape running state control (reverse running direction, etc.) is performed.

[0010]

With the above configuration, it is possible to protect the recorded data from the above-mentioned excessive change in tension, friction between the magnetic tape and the magnetic head, etc., and it is possible to prevent the error rate from decreasing and to improve the reliability of the recorded data. Also improves.

[0011]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a tape pattern diagram showing a data recording method supplied by the present invention, in which 1 is a magnetic tape, 2 is a linear track signal area for recording a recording position on the magnetic tape, 3, 4, 11,
Reference numeral 12 is a helical track in which specific data is written, 5, 6, 7, 8, 9, 10 are helical tracks in which recording data is written, 13 is a period for recording specific data, and 14 is a helical track area. .

The means for generating the track pattern will be described below. When recording the recording data on the magnetic tape 1, the linear track 2 is first generated using the linear track head. Information for knowing the recording position of the magnetic tape is recorded in the linear track signal area 2. Next, the recording head records specific data and recording data in the area 14 on the helical track. The specific data is periodically recorded on the helical track in the cycle 13, and the recording / reproducing head is controlled so as to be on the specific data track when the servo system processing is performed as described later. By controlling in this way, it is possible to protect the recorded data from fluctuations in tension, friction between the magnetic tape and the magnetic head, and the like, which has the effect of improving the error rate as described above. A rotary cylinder equipped with a magnetic head for generating the recording pattern shown in FIG. 1 will be described with reference to FIG.
2 is a rotary cylinder, 15 is a rotary cylinder body,
16, 17, 18, and 19 are reproducing heads, 20, 21, and 2.
Reference numerals 2 and 23 denote magnetic heads. By using the magnetic head having the above structure, the recording pattern shown in FIG. 1 can be generated. A hardware configuration for actual recording / reproducing will be described with reference to FIGS. FIG. 3 shows the structure of the data recorder. 26 and 27 are recording signal input terminals, 30 and 31 are recording signal processing circuits, and 40, 41 and 4.
2, 43 are changeover switches, 44, 45, 46, 4
7, 48, 49, 50, 51 are rotary transformers, 5
6, 57, 58 and 59 are recording heads, 52, 53 and 5
4, 55 are reproduction heads, 28, 29 are reproduction signal processing circuits, 24, 25 are reproduction signal output terminals, 32 is a control circuit,
33 is a servo circuit, 60 is a linear reproducing circuit, 61 is a linear track recording / reproducing head, 34 is a capstan control circuit, 35 is a reel control circuit, 37 is a rotating cylinder, 36
Is a recording tape supply device, 39 is a recording tape take-up device, and 38 is a capstan. The data input from the recording signal input terminal is converted by the recording signal processing circuit into a format for recording on a recording tape, and distributed to each recording head by the changeover switches 42 and 43.
The distributed signals are rotary transformers 48, 49,
Recording heads 56, 57, 58, 5 through 50, 51
9 and recorded on tape. The signal recorded on the tape is reproduced by the reproducing heads 52, 53, 54, 55 and passed through the rotary transformers 44, 45, 46, 47 and the changeover switches 40, 41 to reproduce the data by the reproducing signal processing circuits 28, 29. Is restored and output from the reproduction signal output terminals 20 and 21. Here, the recording signal processing circuit and the reproduction signal processing circuit will be described in detail with reference to FIGS. FIG. 4 shows a recording signal processing circuit.
2 is a data input circuit, 63 is a recording data processing circuit, 64
Is a modulation circuit, 65 is a data selector circuit, 66 is a recording amplifier, 67 is a recording signal processing circuit output terminal, 68 is a specific data generation circuit, and 69 is a data selector control signal input terminal. The data input from the recording signal input terminals 26 and 27 enters the data input circuit 60, and then the recording data processing circuit performs shuffling and the like, and is then modulated by the modulation circuit. Either the signal modulated by the data selector or the specific data is selected, amplified by the recording amplifier, and output from the recording signal processing circuit input terminal 67. The data selector control signal is sent from the servo control circuit,
Indicates a specific data write cycle. FIG. 5 shows a reproduction signal processing circuit, 74 is a reproduction preamplifier, 73 is a reproduction equalization circuit, 72 is a sync detection circuit, 71 is a data buffer, and 70 is a data buffer.
Is an error correction circuit, 77 is a data output circuit, and 76 is a data buffer control signal input terminal. The signal inputted from the reproduction signal processing circuit input terminal 75 is reproduced preamplifier 7
4, the waveform is shaped by the reproduction equalization circuit 73, the synchronization is detected by the synchronization detection circuit 72, the specific data is removed by the data buffer 71, and the data error is corrected by the error correction circuit. The signal is output from the reproduction signal output terminals 24 and 25 through the data output circuit.

By configuring as described above,
The track pattern shown in FIG. 1 can be realized,
Recorded data can be protected.

[0014]

EFFECTS OF THE INVENTION Since a specific area for sliding between the tape and the magnetic head is provided on the tape, and the tape is stopped, waited, or inverted on that area, the recorded data is lost due to excessive sliding. There is an effect that can be prevented.

[Brief description of drawings]

FIG. 1 is a recording track pattern diagram of the present invention.

FIG. 2 is a diagram showing a head arrangement of a cylinder.

FIG. 3 is a diagram showing a configuration of a data recorder.

FIG. 4 is a block diagram showing a recording signal processing circuit.

FIG. 5 is a block diagram showing a reproduction signal processing circuit.

[Explanation of symbols]

 3, 4 ... Helical track with specific data recorded.

Claims (4)

[Claims] 1. A means for recording recording data on a magnetic tape by using a magnetic head in a direction oblique to the tape traveling direction (the area in which the data is written in the oblique direction is hereinafter referred to as a helical track) and a helical track. Means for reproducing the recorded data recorded on the magnetic tape using a magnetic head, and means for recording the recording position on the magnetic tape using the magnetic head in the same direction as the tape running direction (the recording position data is recorded in the same direction). An area to be written is hereinafter referred to as a linear track) and recording position data recorded on the linear track is reproduced by using a magnetic head and is used as a tape traveling system control signal. Characterized by writing the recorded data on the helical track after writing on the entire number of helical tracks. Helical track data recording system. 2. The helical track data recording system according to claim 1, wherein certain data is written over an arbitrary number of helical tracks after the writing of the helical track recording data is completed. 3. A specific data is periodically written over an arbitrary number of helical tracks.
Helical track data recording method described. 4. The helical track data recording method according to claim 2, wherein certain specific data is written to an entire number of helical tracks in response to a specific data write request from the central processing unit.