JPH0737206A - Magnetic reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for inversion of the time base of reproduced signals of every oblique track even in the case of reproducing of any of the recorded information signals in both tape regions of a magnetic tape with the magnetic reproducing device constituted to reproduce the recorded information signals of the magnetic tape recorded with the information signals in such a manner that the oblique tracks are respectively formed on both tape regions bisected at a center line along a longitudinal direction. CONSTITUTION:The magnetic tape successively formed with plural oblique tracks TA, TB in directions reverse from each other in both tape regions 1A, 1B bisected at the center line along the longitudinal direction. The magnetic tape 1 recorded with the information signals in such a manner that the time directions of the respective oblique tracks TA, TB in both tape regions 1A, 1B is wound diagonally around a tape guide drum having a rotary magnetic head. The recorded information signals of the tape regions 1A, 1B of the magnetic tape 1 are reproduced by reversing the rotating directions of the rotary magnetic head from each other and reversing the traveling directions of the magnetic tape 1 from each other to the both tape region 1A, 1B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic reproducing apparatus for recording an information signal such as a PCM audio signal recorded by forming a tilted track on a magnetic tape by using a rotary magnetic head.

[0002]

2. Description of the Related Art Conventionally, a magnetic tape of a tape cassette is obliquely wound around a tape guide drum having a rotary magnetic head, and the tape is divided into two opposite tape areas divided by a center line along the longitudinal direction of the magnetic tape. There has been proposed a magnetic recording / reproducing apparatus in which a PCM audio signal is recorded so as to sequentially form a plurality of inclined tracks and is reproduced.

In this case, there are the following two methods of recording the information signal in both tape areas of the magnetic tape by the conventional magnetic recording apparatus. This will be explained with reference to FIGS. 5 and 6. In these figures, 1 is the magnetic tape of the tape cassette, L is the center line along the longitudinal direction,
1A, 1B centerline L Thus 2 minutes and both of the tapes regions of the tape 1, A, B both tape area 1A, together opposite the running direction of the magnetic tape 1 during 1B recording reproducing, T _A, T _B is Inclined tracks formed by sequential recording on both tape areas 1A and 1B, and a and b indicate the scanning directions of the rotary magnetic head with respect to the inclined tracks T _A and T _B , respectively. Further, in the inclined tracks T _A and T _B , the time axis direction of the information signal recorded therein is represented by the direction from the hatched area to the non-hatched area.

The recording pattern of the magnetic tape 1 shown in FIG.
In A and 1B, the scanning directions a and b of the rotary magnetic head are the same, and the time axes of the inclined tracks T _A and T _B are also the same. In order to record the magnetic tape 1 having such a recording pattern by the auto-reverse type magnetic recording device, the tape running directions are made different in both tape areas 1A and 1B, but the rotating magnetic head is made to rotate in the same direction. Therefore, the automatic reverse recording of the magnetic tape 1 can be smoothly performed.

However, regarding reproduction, in either the auto-reverse type or the one-way type magnetic reproducing apparatus, when reproducing the tape area 1B, inversion for inverting the time axis of the reproduced signal for each inclined track T _B. Need a circuit.

When the recording pattern of the magnetic tape 1 shown in FIG. 5 cannot be turned inside out as a tape cassette, only an automatic reverse type magnetic reproducing apparatus reproduces both tape areas 1A and 1B. As a result, it is impossible to reproduce the tape area 1B with the one-way magnetic reproducing apparatus.

The recording pattern of the magnetic tape 1 shown in FIG.
In A and 1B, the scanning directions a and b of the rotary magnetic head are opposite to each other, and the time axis directions of the inclined tracks T _A and T _B are also opposite to each other. Magnetic tape 1 with such recording pattern
In order to record the data with an automatic reverse type magnetic recording device, the tape running direction is made different between the two tape areas 1A and 1B, and the rotating direction of the rotary magnetic head is made different. In this case, smooth auto reverse recording is difficult.

[0008]

As described above, as shown in FIG.
Magnetic tape 1 in the recording pattern of, for reproduction, in any of the autoreverse type or one-way type magnetic reproducing apparatus also when reproducing the tape region 1B, the time axis of the reproduction signal of each inclined track T _B When the tape cassette needs to be reversed and the tape cassette cannot be turned inside out, only the auto-reverse type magnetic reproducing device can reproduce both tape areas 1A and 1B.
The one-way magnetic reproducing apparatus cannot reproduce the tape area 1B.

In view of such a point, the present invention provides a recording information signal of a magnetic tape in which an information signal is recorded so that inclined tracks are formed in both tape regions divided by a center line along the longitudinal direction. In a magnetic reproducing apparatus for reproducing, it is proposed to eliminate the need to invert the time axis of the reproduced signal for each inclined track when reproducing any of the recorded information signals in both tape areas of the magnetic tape. It is a thing.

[0010]

According to the present invention, a plurality of inclined tracks T _A and T _B are sequentially formed in opposite directions in both tape regions 1A and 1B which are bisected by a center line along the longitudinal direction. At the same time, the magnetic tape 1 on which the information signals are recorded so that the time directions of the respective inclined tracks T _A and T _{B in} the two tape areas 1A and 1B are opposite to each other is attached to the tape guide drum 2 provided with the rotary magnetic head 6. The tapes 1A and 1B are obliquely wound around the magnetic tape 1 so that the rotating magnetic heads 6 rotate in opposite directions and the magnetic tapes 1 run in opposite directions. The magnetic reproducing apparatus is characterized in that the recorded information signals of the tape areas 1A and 1B are reproduced.

[0011]

According to the present invention, a plurality of inclined tracks T _A and T _B are sequentially formed in opposite directions in both tape regions 1A and 1B which are divided into two by the center line along the longitudinal direction. When reproducing the magnetic tape 1 on which the information signal is recorded so that the time directions of the respective inclined tracks T _A and T _B in both tape areas 1A and 1B are opposite to each other,
The tape is wound around the tape guide drum 2 having the rotary magnetic head 6 at an angle so that the rotational directions of the rotary magnetic head 6 are opposite to each other and the running directions of the magnetic tape 1 are opposite to each other with respect to both tape areas 1A and 1B. In this way, by reproducing the recorded information signal of both tape areas 1A and 1B of the magnetic tape 1, the tape areas 1A and 1B of the magnetic tape 1 can be recorded without reversing the time axis of the reproduction signal. The recorded information signal can be reproduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows a recording pattern for the magnetic tape 1. The recording pattern of FIG. 1 is shown in FIG.
The recording pattern is the same as that of FIG. 6, but the recording method is different from that of FIG. L is a center line along the longitudinal direction, 1A and 1B are both tape regions divided by the center line L of the magnetic tape 1,
A and B are opposite running directions of the magnetic tape 1 at the time of recording and reproducing of both tape areas 1A and 1B, T _A and T _B are slant tracks formed by sequential recording of both tape areas 1A and 1B, and a and b Indicates the scanning directions of the rotary magnetic head 6 with respect to the inclined tracks T _A and T _B , respectively. Further, in the inclined tracks T _A and T _B , the time axis direction of the information signal recorded therein is represented by the direction from the hatched area to the non-hatched area. The scanning direction of the rotary magnetic head 6 at the time of recording is the same as the directions a and b in both tape areas 1A and 1B as shown in the figure, but the scanning direction of the rotary magnetic head 6 at the time of reproduction is the same in the tape area 1A. A in the direction shown
However, in the tape area 1B, the direction is opposite to the illustrated direction a.

Next, the rotary head device will be described with reference to FIGS. 2 is a tape guide drum, for example,
It is composed of upper and lower fixed drums 3 and 4, and a rotary drum 5 arranged between them and provided with a rotary magnetic head 6. still,
The tape guide drum 2 may be composed of a fixed lower drum and a rotating upper drum provided with a rotating magnetic head.

Reference numeral 9 is a motor for driving the rotary drum 5. 7 and 8 are magnetic tapes 1 for the tape guide drum 2
The magnetic tape 1 of the tape cassette that can be turned upside down is obliquely wound around the cylindrical surface of the tape guide drum with a winding angle of 90 ° by the guide for determining the winding angle.

A magnetic tape 1 having the recording pattern shown in FIG.
The recording will be described. In this case, both tape areas 1
Although the tape running directions are different between A and 1B, the rotating magnetic head 6 is rotated in the same direction.

In this case, there is no problem in the tape area 1B, but in the tape area 1A, an information signal to be recorded, that is, P
An inversion circuit that inverts the time axis for each unit signal section in which the CM audio signal is recorded on the one inclined track is required. The inverting circuit will be described below with reference to FIG. In FIG. 4, reference numeral 20 generally indicates an inverting circuit.

Reference numeral 10 denotes a memory (RAM), which is an input terminal 11
The audio signal from the memory 10 is supplied to the PCM encoder 12 to be converted into a PCM audio signal, and then the memory 10
Supply to and write. At the time of writing, the address signal from the write address counter 13 is supplied to the memory 10 via the multiplexer 14. A write / read control signal from the input terminal 15 switches the write / read mode of the memory 10 and the write / read address of the multiplexer 14 in conjunction with each other.

Reference numeral 16 is a read address counter, which is composed of an up / down counter, and is switched to a down counter when recording in the tape area 1A of the magnetic tape 1 on the basis of a control signal from a control signal input terminal 17. When recording on the tape area 1B, the up counter is switched.
The read address signal from the read address counter 16 is supplied to the memory 10 via the multiplexer 14.

Therefore, if the read output from the memory 10 is supplied to the rotary magnetic head 6 via the amplifier 18, the rotational direction of the rotary magnetic head 6 is not changed, and the tape running direction is changed. Both tape areas 1A, 1B
It is possible to record a PCM audio signal with quick reverse so as to form inclined tracks T _A and T _B at.

The magnetic tape 1 having the recording pattern shown in FIG.
In order to reproduce, the magnetic tape 1 is obliquely wound around the tape guide drum 2 having the rotary magnetic head 6, and the rotating directions of the rotary magnetic head 6 are opposite to each other for both tape areas 1A and 1B. At the same time, the recording information signals of both tape areas 1A and 1B of the magnetic tape 1 are reproduced by making the running directions of the magnetic tape 1 opposite to each other.

The reproduction in this case may be an auto-reverse type reproduction or a unidirectional type reproduction, and further, since an inversion circuit for inverting the time axis of the reproduction signal for each inclined track is not necessary, it is suitable for reciprocal reproduction. is there. Incidentally, when reproducing the magnetic tape having the recording pattern shown in FIG. 5, it is not necessary to invert the time axis of the reproduction signal when reproducing the inclined track T _A of the tape area 1A, but the inclination of the tape area 1B is required. when playing a track T _B, it is necessary to reverse the time axis of the reproduction signal, from the play tape area 1A, when playing continues tape area 1B is a reciprocating reproduction because the reproduction is delayed Not suitable.

[0022]

According to the present invention described above, a plurality of inclined tracks are sequentially formed in opposite directions to each other in each of the two tape areas divided by the center line along the longitudinal direction, and each of the tape areas in both tape areas is formed. The magnetic tape on which the information signals are recorded such that the time directions of the inclined tracks of are opposite to each other is obliquely wound around the tape guide drum equipped with the rotating magnetic head, and the rotating direction of the rotating magnetic head is adjusted with respect to both tape areas. The recording information signals of both tape areas of the magnetic tape are reproduced by reversing the directions of the magnetic tape and the traveling directions of the magnetic tape, so that the two tapes divided by the center line along the longitudinal direction are reproduced. When reproducing either of the two tape areas of the magnetic tape in which the information signal is recorded so that each area has an inclined track, the time of the reproduction signal for each inclined track Reversal is not required of. Therefore, it is suitable for reciprocal reproduction.

[Brief description of drawings]

FIG. 1 is a pattern diagram showing a recording pattern of a magnetic tape reproduced by an apparatus of the present invention.

FIG. 2 is a plan view showing a tape guide drum of the device of the present invention.

FIG. 3 is a front view showing a tape guide drum of the device of the present invention.

FIG. 4 is a block diagram showing an example of an inversion circuit used at the time of recording by the device of the present invention.

FIG. 5 is a pattern diagram showing one recording pattern of a magnetic tape recorded by a conventional magnetic recording device.

FIG. 6 is a pattern diagram showing another recording pattern of a magnetic tape recorded by a conventional magnetic recording device.

[Explanation of symbols]

1 the magnetic tape L centerline 1A tape area 1B tape area T _A oblique tracks T _B oblique tracks second tape guide drum 6 rotating magnetic head 20 inverting circuit

Claims (1)

[Claims] 1. A plurality of slant tracks are sequentially formed in opposite directions to each other in both tape areas divided by a center line along the longitudinal direction, and the time directions of the respective slant tracks in the both tape areas are set. Magnetic tapes on which information signals are recorded so as to be opposite to each other are obliquely wound around a tape guide drum having a rotating magnetic head, and the rotating directions of the rotating magnetic heads are opposite to each other with respect to the both tape areas. At the same time, the magnetic tape reproducing device is characterized in that the running directions of the magnetic tape are reversed to reproduce the recorded information signals in both the tape areas of the magnetic tape.