JPS6126902A - Helical scan type magnetic recording and reproducing system - Google Patents

Abstract

PURPOSE:To attain an easy application of the titled recording/reproducing system to a data recorder by dividing a magnetic tape into plural areas in its width direction and recording a series of information signals of the same format to each divided area and then reproducing them as a series of information signals of the same format. CONSTITUTION:The data supplied from an input terminal 8 is converted into a prescribed format by a data modulator 1 according to the data conversion reference signal produced from a reference clock supplied to a clock input terminal 9. The reference clock is supplied also to a drive mechanism control circuit 6 via a phase shifter 5. The circuit 6 produces a reference signal and controls the switch between two magnetic heads of a rotary head 3. The modulation data are recorded to areas R1 and R2 divided in the with direction of a magnetic tape 4 by a head 3 via an amplifier 2 and also to areas R3, R4- with phases shifted successively. While the signals having phases shifted successively are used to the reference signal which controls a drive mechanism 7 also in a reproduction mode. Thus the reproduction data is obtained at an output terminal 10 of the modulator 1. This secures an easy application of this recording/reproducing system to a data recorder.

Description

[Detailed description of the invention] Technical field The present invention relates to a magnetic recording and reproducing method.

A magnetic recording device using a rotating head method scans a magnetic tape helically to continuously record and reproduce the entire area in the width direction of the tape in the head scanning direction.
TR (Video l"ape, Record
It is applied to er > etc. Recently standardized 8m
In the mVTR, the magnetic tape has a tape format divided into a video area and an audio area, as shown in FIG. According to this tape format, a video area and an audio area constitute one track in the head scanning direction. Different types of data are recorded in these areas, and the expandability to applications such as data records has not necessarily been sufficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a helical scanning magnetic recording/reproducing system that can be easily applied to an f-tare recorder.

In the helical scanning magnetic recording and reproducing system according to the present invention, a plurality of areas are provided in the tape width direction, and one of the areas is selected and used for both recording and reproduction.

Embodiment FIG. 2 is a diagram for explaining an embodiment of the method of the present invention. According to this embodiment, the magnetic tape is divided in the width direction so that a plurality of regions R1, R2, . . . , R6 are arranged side by side.

During recording, an arbitrary area is selected from among a plurality of these areas, and only the selected area is sequentially printed in the rotating head scanning direction, and only the selected area is continuously printed.

FIG. 3 shows a state in which all areas have been selected and recorded. According to this recording method, the information tracks TI', ``I-3'', .

゛ For recording in this way, FIG. 4 shows information tracks 1-1 . R2 . Note that, like in FIG. 3, FIG. 4 shows the case where the entire area is selected and recorded.

In both of the recordings shown in FIGS. 3 and 4, at the time of reproduction, a plurality of already recorded areas can be sequentially scanned in the rotating head scanning direction to read a plurality of areas at once.

As shown in FIG. 3, each area track does not form one track in the head scanning direction, and as shown in FIG. 4, each area track forms one track in the head scanning direction. When compared, the case of FIG. 3 does not impair the random access property of selecting a recorded area, but the case of FIG. 4 is easier to perform random access. For example, as shown in FIG. 5, it is possible to extract two regions [R3 and R5 in the head scanning direction at once, and as a result, two pieces of data can be calculated. On the other hand, if the information tracks for each area are independent as shown in FIG.
Even if an attempt is made to simultaneously extract the data of the region R3 and the data of the region R3, the data of the region R3 cannot be extracted if control is performed so that the data of the region R4 can be extracted due to track deviation.

As shown in FIG. 4, the information tracks of each area are arranged along the head scanning direction and a series of information signals or data is recorded in one area. As for τ, the following two methods can be considered.

(1) Data modulators for converting the data to be recorded according to the data format are prepared as many as the number of areas to be formed, and the data modulators are sequentially supplied to the recording head to complete recording at once.

(2) As shown in Figure 6, the area iii that has already been recorded
! Using the information of R1 and R2, control is performed so that the area H3 to be recorded forms the same straight track as the recorded areas R1 and R2.

In reality, method (2) above is effective, as it can be used with just one data format modulator and has many advantages, such as being able to time-shift the recording of multiple areas. .

When recording as shown in FIG. 6, as shown in FIG. 7, the head width t of the rotating head used is wider than the generally formed track width p (both ends of adjacent recording areas overlap each other). Therefore, if optimal control is performed on the recorded areas R1 and R2, the track of the newly recorded area R3 will be shifted according to the head width t. This deviation is not desirable, and therefore, as shown in FIG. 8, the optimal head scanning state for the recorded area is controlled by shifting it according to the head width t, so that each area becomes one track. Preferably, a new recording is made.

In the embodiments described above, the tape running direction is the same for all areas, but it is also advantageous to reverse the tape running direction for each adjacent area, as shown by the arrows in FIG.

For example, if an audio signal is recorded or played back as data, it can be used like an auto-reverse device for compact cassette decks currently on the market.

If you reach the end of a tape winding while recording or playing back a certain area, and you want to record or play back an adjacent area, there is no need to rewind the tape, and you can record or play the tracks in the adjacent area from the position at the beginning of the tape winding. Can be played.

Next, an example of an apparatus for carrying out the method of the present invention will be explained based on FIG. In this example, as shown in FIG. 3, a helical scanning type magnetic recording/reproducing method is executed when each area does not form the same track. In the figure, 1 is a data modulator/demodulator, 2 is a recording/reproducing amplifier, 3 is a magnetic head with two rotating heads, 4 is a magnetic tape, 5 is a phase shifter,
6 is a drive mechanism control circuit, and 7 is a drive mechanism such as a rotary head motor.

- The operation of this device will be explained with reference to FIGS. 11 and 12. 11 is a diagram showing the timing of various reference signals and data, and FIG. 12 is a diagram showing regions R1 and R2 of the magnetic tape 4.

The data inputted from the input terminal 8 is sent to the data modulator/demodulator 1 83, and the data conversion reference signal [Fig. 3 and (d)].
converted to N't (Figure 11(C) and +e+)
.

On the other hand, the reference clock is also supplied to the phase shifter 5', and the phase-shifted reference clock is sent to the drive mechanism control circuit 6.

The drive and mechanism control circuit 6 forms a reference signal for controlling the drive mechanism (FIG. 11(a)).This reference signal also means a two-head switching signal here.

The data conversion reference signal of FIG. 11 (output 11) is in phase with the reference signal of FIG. 11 (ω), but the data conversion reference signal of FIG. Only the phase is shifted.By doing this, the 11th
The data in FIG. 11(C) is recorded in the area R1 of the magnetic tape in FIG. 12 by the rotary head 3 via the recording/reproducing amplifier 2, and the data in FIG. 11(e) is recorded in the area R2 in FIG.
recorded in

The above describes the recording in areas R1 and R2, but for areas R3, R4, etc., data conversion reference signals whose phases are sequentially shifted relative to the reference signal that controls the drive mechanism 7 are also used. It can be recorded by using

Also, when reproducing data from the magnetic tape 4, by using a data conversion reference signal that is out of phase with the reference signal that controls the drive mechanism 7, the data can be reproduced at the output terminal 10 of the data modulator/demodulator 1. data can be obtained.

Next, FIG. 13 shows an example of an apparatus for implementing the method of the present invention. In this example, a helical scanning magnetic recording/reproducing method is performed in which each area forms the same track as shown in FIG. 4. 11 in the figure is data strange! ll]/demodulator, 12-reproducing amplifier, 13 is a recording amplifier, 14 is a rotary head, 15 is a magnetic tape, 16 is a control signal sampling circuit, 17 is a phase shifter, 18 is a drive mechanism control circuit, 19 is a drive mechanism It is.

The configuration of this device is almost the same as that of the device shown in FIG.
and the drive mechanism drive mechanism 18. This control signal extraction circuit 18 is a circuit for extracting control signals from an already recorded area.

The operation of this device will be explained with reference to FIG.

Recording and reproduction in the regions R1, R2, .

In this example of the apparatus, in order for the information tracks in the regions R1, R2, . . . First, an information track T1 is recorded in the first area R1. Next, when recording the information track [2] in the area R2, the information track T1 is reproduced via the rotary head 14 and the reproducing amplifier 12, and the information recorded on the information track T1 is Extract the signal.

This information signal is sent to the drive-mechanism control circuit 18 to control the drive mechanism 19, so that the information track 1"2 in the region R2 is aligned in a straight line in the head scanning direction with respect to the information track T1 in the region R1.

Similarly, when recording information track-13 in area R3, the information of recorded information track T2 is read and the drive structure is controlled. By repeating such operations, the tracks 1'1, 1-2, . . . , T6 can be aligned in a straight line in the head scanning direction.

Effects According to the method of the present invention, the magnetic tape format is divided into a plurality of areas in the tape width direction, and any area can be selected and used during the scanning of the rotating head for both recording and playback. , it can be applied not only to VTRs but also to data recorders, making it highly expandable to various uses.

[Brief explanation of the drawing]

1st tliJ is a diagram showing the format of an 8 msVTR 11-ki tape, FIG. 2 is a diagram showing a tape format for explaining an embodiment of the method of the present invention, and 3rd
The figure shows a recording state in which the information tracks in each area do not constitute one track, Figure 4 shows the recording state in which the information tracks in each area constitute one track, and Figure 5 shows the extraction of areas. 6 is a diagram showing a state in which recording is performed to form one track. FIGS. 7 and 8 are diagrams for explaining recording deviation due to head width and its correction. 10 is a block diagram showing the configuration of an embodiment of the present invention; FIGS. 11 and 12 10 is a diagram for explaining the operation of the apparatus shown in FIG. 10, and FIG. 13 is a block diagram showing the configuration of an embodiment of the system of the present invention. Explanation of codes of main parts 1.11...Data modulator/demodulator 2...
・Recording/reproducing amplifier 3.14... Rotating head 4.15... Magnetic tape 5.17... Phase shifter 6, 18... Drive Mechanism control circuit 7.19・
... Drive mechanism 8 ... Input terminal 9 ... Clock input terminal 10 ... Output terminal 12 ... Regenerative amplifier 13 ...・Recording amplifier

Claims (8)

[Claims] (1) A helical scanning magnetic recording and reproducing method in which information signals are recorded and reproduced while helically scanning a magnetic tape with a rotating head, in which the magnetic tape is divided into a plurality of areas in the width direction and each area has the same information. A helical scanning magnetic recording and reproducing system characterized by recording a series of information signals in the same format and reproducing them as a series of information signals in the same format. (2) The helical scanning magnetic recording and reproducing system according to claim 1, wherein a plurality of different information signals are sequentially recorded or reproduced in different areas in a time-series manner. (3) The helical scanning magnetic recording and reproducing method according to claim 1, characterized in that a series of information signals is recorded or reproduced in time series in any one of the areas. (4) A patent claim characterized in that the information tracks recorded in each of the selected plurality of areas are recorded in each area so that they are aligned on the same straight line with information tracks in other areas in the scanning direction of the rotating head. The helical scanning magnetic recording and reproducing method according to item 3. (5) The helical scanning magnetic recording and reproducing method according to claim 4, characterized in that recording in the second and subsequent areas is performed while controlling a drive mechanism based on information on recorded areas. . (6) The helical scanning type magnetism according to claim 4, characterized in that when reproducing a plurality of recorded areas, the reproduction is performed while controlling a drive mechanism based on information of the recorded areas. Recording and playback method. (7) Helical scanning type magnetism according to claim 6, characterized in that recording is performed by shifting the rotary head by a certain bias from an optimal state in which the rotary head scans the recorded area. Recording and playback method. (8) The helical scanning magnetic recording and reproducing method according to any one of claims 1 to 8, wherein the tape running direction is reversed for each of the adjacent regions.