JPS6242301A - Magnetic recording and reproducing method - Google Patents

Abstract

PURPOSE:To reduce remarkably a time required for dubbing operation by reversing the turning direction of a head when the tape running direction is reversed in recording and reproducing a signal at each sector split in the tape width direction. CONSTITUTION:A track A is a sector whose signal is recorded and reproduced when a tape 1 is run in the arrow C, a track B is a sector onto/from which a signal is recorded and reproduced in running the tape 1 in the direction of arrow D, and the direction traced by a rotary head is coincident with the direction of a combined vector between a tape running speed vector and a rotary speed vector of the rotary head. When both the tracks A, B are formed on a straight line, the signal is reproduced from both the tracks A, B once in case of, e.g., dubbing and the signal is recorded further on them. In recording a reproducing the signal of the tracks A, B, not only the tape running direction but also the turning direction of the rotary head is reversed together.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a magnetic tape recording and reproducing method using a helical scan method, and more specifically, a magnetic tape area is divided into a plurality of small tracks in the tape width direction. This must be related to magnetic recording and reproducing methods for recording and reproducing signals.

(Prior Art) As a magnetic tape recording and reproducing method, a helical scan method is often adopted due to its high tape utilization efficiency. Among the methods using such a helical scan method, methods are known in which the tape area is divided in the tape width direction to create 2 or 4 channels, making it possible to record and play back in one go. In recording and reproducing digital audio signals, methods using multiple channels are attracting attention because time compression is easily possible.

By the way, in recent years, with the spread of magnetic tape, the so-called dubbing operation, which copies the contents recorded on magnetic tape, has become more frequent, even at the consumer level. It's coming. When such a dubbing operation is performed on a magnetic tape recorded using upper number channels, if the tracks of each channel adjacent to each other in the tape width direction are aligned in a straight line, the tracks of each channel are This is very preferable because simultaneous dubbing can be performed by performing the rotary head recording operation twice, and the time required for the dubbing operation can be shortened.

However, the direction in which the track extends coincides with the direction of the composite solid surface of the tape running speed vector 33 and the rotational speed vector of the rotary head at the time of track formation.

Therefore, in the conventional method in which only the tape running direction is reversed by different channels, the tracks of the channels recorded by different tape running directions are formed with different inclinations, and each adjacent track in the tape width direction is The problem was that the channel tracks were not aligned in a straight line, and the dubbing operation took a long time.

(Objective of the Invention) The present invention is intended to solve the above-mentioned problems, and employs a helical scan method in which the magnetic tape area is divided in the tape width direction to enable reciprocating recording and playback as multiple channels. It is an object of the present invention to provide a magnetic recording and reproducing method that can perform high-speed dubbing operations.

(Structure of the Invention) The magnetic recording and reproducing method of the present invention uses the helical force-gyan method and divides the magnetic tape area in the tape width direction to form multiple channels to enable reciprocating recording and reproducing. , when recording/reproducing signals on the tracks of each of the divided areas, when the tape running direction is reversed, the head rotation direction is also reversed.

(Effects of the Invention) *According to the magnetic recording and reproducing method of the invention, when recording and reproducing signals for each area angle and each channel of V in the width direction of the tape When the direction is reversed, the direction of rotation of the head is also reversed, so if the tape running speed and head rotation speed are always kept constant, the direction of the composite vector of these two speeds will always be constant. The troughs/') adjacent to each other in the tape width direction of each channel can be aligned on a straight line.

As a result, when performing a dubbing operation, signals can be recorded and reproduced simultaneously on multiple tracks adjacent to each other in the tape width direction by rotating the rotary head several times, and the tape can be simply run once. Since signal recording and reproduction can be completed for all channels, the time required for dubbing operations can be significantly reduced.

(Embodiments) Hereinafter, embodiments of the present invention will be described using the drawings.

FIG. 1 conceptually shows a helical track formed using the magnetic recording and reproducing method of this embodiment.

Magnetic tape 1 is 7.6. Width metal powder tape τ′
The commercially available Large 1 Herak 2 was formed using a 30Φ rotating cylinder and a 2-head type rotating head assembly. person (~1 rack 8 out of 2 racks is tape 1
The signal was recorded by running the tape 1 to the right at a speed of 7 mm, -.
The signal was recorded by running at a speed of m/SeC, and each track pitch was 1? , αm.

In addition, when performing audio recording from PC to 1, for example, 16 bits due to early generation, sample rate 48KH2,
It is configured in a two-channel stereo format, and a time-compressed digital signal is recorded on each track /\,B.

By the way, track A is an area where signals are recorded and reproduced when tape 1 is run in the direction of arrow C7J', and track B is an area where signals are recorded and reproduced when tape 1 is run in the direction of arrow C7J'. be. , so LT, these 1-Rack A
, B, that is, the direction in which the rotating head traces, coincides with the direction of the composite pattern 1 to 1 of the tape running speed vector and the rotational speed vector of the rotating head. Therefore, when the rotary head rotates in only one direction, such as in a conventional VTR device or an 8-durable PCM audio recording and reproducing device, the directions in which the tracks A and B extend are as shown in FIG. That is, the track A is formed in the direction of the composite vector 5 of the tape running speed vector 100 and the rotating head rotation speed vector C. Also, a track B is formed in the direction of the composite vector 100 of the tape running speed vector b and the rotational speed vector C of the rotary head. Therefore, the second
As is clear from the figure, both tracks A and Btt are formed so as to cross each other at a constant angle, and these two racks A and B are not formed on one straight line.

However, if both tracks A and B are formed on one straight line, for example, when dubbing, it is possible to reproduce signals from both tracks A and B at once and roughly record the signals. Very convenient and intersecting. That is, the dubbing operation for both tracks A and B can be performed by simply running the tape one way without having to run it back and forth, so that the time required for the dubbing operation can be shortened.

In view of these circumstances, in the magnetic recording and reproducing method of this embodiment, when recording and reproducing signals on tracks A and B, not only the tape running direction but also the rotating direction of the rotary head are reversed to each other. I'm trying to make it happen. FIG. 3 shows tracks A and B formed according to this embodiment using composite vectors as shown in FIG. 2.

That is, track A is formed in the same manner as the conventional method, but track B is formed in a different manner. Here, track B is formed in the direction of composite vector e' of tape running speed vectors 1 to b and rotary head rotational speed vector C, but vector C' has the same magnitude as vector C and points in the opposite direction. Since it is formed by a solid pattern 1 to 1, it is formed as a vector pointing in the opposite direction with a size equal to vector e'< y vector 100.

As a result, the track B can be formed on one straight line with the track Δ, and the time required for the dubbing operation can be shortened for the above-mentioned reason.

Note that the above-described method is particularly effective in the case of PCM audio recording and playback, where time compression can be easily achieved.

The appropriate degree of time compression is to set the time axis to about 0.8 to 0.02, in which case the cylinder wrap angle is 14 per track.
4° to 36°.

Incidentally, in the embodiment described above, the tape recording area is divided into two in the tape width direction to form one rack.
Depending on the situation, a track may be formed for each area by dividing the area into more than -C, for example, into 4 or 8 areas. However, it is desirable to divide the video into an even number because it saves the effort of rewinding.

[Brief explanation of the drawing]

FIG. 1 is a diagram conceptually showing a helical track formed by the magnetic recording and reproducing method of the actual WA embodiment of the present invention, and FIG.
3 and 3 show actual tIfA according to the conventional method and the present invention.
FIG. 3 is a schematic diagram for explaining differences in tracks formed by methods according to embodiments. 1...Magnetic tape 2...Large track Figure 1

Claims (1)

[Claims] In a magnetic tape recording and reproducing method using a helical scan method, the recording area of the magnetic tape is divided into a plurality of tracks arranged in the width direction of the tape, and signals are recorded and reproduced on these tracks. . A magnetic recording and reproducing method characterized in that signals are recorded so that tracks whose tape feeding directions are opposite to each other also have head rotation directions opposite to each other.