JP3045203B2 - Magnetic recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium such as a magnetic tape of a multi-track tape recorder and a recording apparatus.

[0002]

2. Description of the Related Art In a multi-track tape recorder, a synchronizing signal may be recorded for sequence control or for synchronous driving with another device.

[0003]

However, when a synchronization signal is recorded adjacent to an audio track, the synchronization signal becomes noise of the audio signal due to crosstalk. This kind of problem occurs remarkably when the synchronization signal is an FSK signal.

Accordingly, an object of the present invention is to provide a magnetic recording medium capable of eliminating the adverse effect of leakage magnetic flux on an adjacent track and a recording apparatus for producing the same.

[0005]

In order to achieve the above object, the present invention provides a first recording apparatus for recording a main information signal.
For recording the first and second sub information signals
Along a first track formed by the first recording head.
Second and third tracks scanned side by side
And third recording heads arranged to form
Supplying the main information signal to the first recording head
A main information signal supply circuit and the second recording head
A first sub information signal supply circuit for supplying one sub information signal
And the position of the first sub-information signal on the third recording head.
A second signal for supplying the second sub information signal comprising a phase inversion signal;
The present invention relates to a magnetic recording apparatus having two sub information signal supply circuits .

[0006]

The main information signal is recorded by the first recording head.
Then, the first sub information signal is recorded by the second recording head.
Not only does the first sub-information
When the second sub-information signal having the opposite phase to the information signal is recorded, the first
And the leakage fluxes based on the second sub information signal are also in opposite phases.
And the leakage flux based on the first and second sub information signals
Cancellation occurs. Therefore, it is possible to reproduce the main information signal with less interference due to the leakage magnetic flux of the first and second sub information signals.

[0007]

First Embodiment Next, a cassette type multi-track tape recorder according to an embodiment of the present invention will be described with reference to FIGS. The magnetic tape 1 and the pair of reels 2 and 3 are housed in a cassette case (not shown). The pair of reels 2 and 3 and the capstan 4 are driven by a tape traveling device 5. The pinch roller 6 comes into contact with the capstan 4 to make the tape 1 run at a constant speed. As a result, a scanning motion occurs between the tape 1 and the composite magnetic head 7, and recording, reproduction, and erasing of signals are performed.

The composite magnetic head 7 includes a first head 8 for recording and reproducing main information (first information signal) having a four-channel structure.
And second, third, and fourth heads 9, 10, 1 for recording and reproducing a synchronization signal (second information signal) as a sub information signal.
1 and a 4-channel erase head 12.
Four recording / reproducing gaps G1 and G2 of the first head 8
, G3, G4 are tapes 1 to form first to fourth main tracks T1, T2, T3, T4 as shown in FIG.
Are juxtaposed in the width direction. Four gaps G1 to G4
Have the same track width W1.

Second, third and fourth heads 9, 10, 1
One gap G5, G6, G7 is located between the gaps G2 and G3. The width W2 of the gap G5 of the second head 9 disposed at the center is the width W3 of the gaps G6 and G7 of the third and fourth heads 10 and 11 disposed on both sides.
Greater than. The gaps G5, G6, G7 are arranged on a straight line extending at right angles to the longitudinal direction of the tape 1. The four erasing gaps E1 to E4 of the erasing head 12 are arranged to scan the same track as the four gaps G1 to G4 of the first head 8.

In FIG. 1, a first head 8 has a four-channel input terminal 13 and a four-channel reproduction output terminal 1.
4 is connected to a recording / reproducing circuit 15 having The recording / reproducing circuit 15 includes a recording / amplifying circuit for amplifying the audio signal supplied from the input terminal 13 and sending the amplified signal to the head 8, and a reproducing / amplifying circuit for amplifying the reproduced signal obtained from the head 8 and sending the amplified signal to the output terminal 14. This is a well-known circuit.

The synchronizing signal generating circuit 16 includes a recording amplifier 17
The third and fourth heads 10 are connected to the second head 9 via the contact R of the changeover switch 18 and the phase inverting circuit 19, the recording amplifier circuit 20, and the contact R of the changeover switch 21. , 11 are connected. Note that, instead of providing the phase inversion circuit 19 independently, this can be included in the recording amplification circuit 20 or the synchronization signal generation circuit 16.

A reproduction amplifier 22 for synchronizing signals is connected to the second head 9 via a contact point P of the first changeover switch 18.

[0013]

[Operation] When recording an audio signal and a synchronization signal, the tape 1 is run and the audio signal A is input to the input terminal 13.
To form the first to fourth main tracks T1 to T4 having a width W1 by the gaps G1 to G4 of the first head 8.
Substantially at the same time, the in-phase synchronizing signal + S composed of, for example, an FSK signal is supplied from the synchronizing signal generating circuit 16 to the second head 9, and the first synchronizing signal having a width W2 indicated by hatching in FIG. The track TS1 is formed and the phase inverting circuit 19
3 is supplied to the third and fourth heads 10 and 11 to output a width W indicated by hatching in FIG.
The second and third synchronization signal tracks TS2 and TS3 (sub tracks) are formed. The width W3 of the second and third synchronization signal tracks TS2, TS3 is smaller than the width W2 of the first synchronization signal track TS1.

During reproduction, the gap G1 of the first head 8 is
G4 scans the first to fourth main tracks T1 to T4 and the second head 9 scans the first synchronization signal track TS1. The first head 8 reads audio signals (first information signals) of the first to fourth main tracks T1 to T4 having a width W1. At this time, the gaps G2, G3 for scanning the second and third main tracks T2, T3 are affected by the magnetic fluxes of the first to third synchronization signal tracks TS1, TS2, TS3. However, since the positive-phase synchronizing signal + S is recorded on the first synchronizing signal track TS1 and the negative-phase synchronizing signal -S is recorded on the second and third synchronizing signal tracks TS2 and TS3 on both sides of the first synchronizing signal track TS1, the homologous signal is recorded. Therefore, the synchronizing signal components (noise components) do not affect the gaps G2 and G3. From the main tracks T2 and T3 to the first to third synchronization signal tracks TS1 to Ts
Although the distance to S3 is different, the width W2 of the farthest middle first synchronization signal track TS1 is wider than the width W3 of the second and third synchronization signal tracks TS2 and TS3.
The magnetic flux based on the positive-phase synchronizing signal and the magnetic flux based on the negative-phase synchronizing signal for the gaps G2 and G3 of the head 8 become substantially equal, and almost completely cancel each other.

As is apparent from the above, according to the system of the present embodiment, it is possible to reproduce the main information by removing the crosstalk of the synchronization signal (sub information). Also, since the crosstalk can be eliminated, the synchronization signal track TS
1, TS2 and TS3 can be arranged adjacent to the main tracks T2 and T3, so that the space between the two main tracks T2 and T3 can be effectively used to record a synchronization signal. Therefore, it is not necessary to use one of the main tracks T1 to T4 for recording the synchronization signal, and the utilization rate of the magnetic tape 1 can be increased.

[0016]

Second Embodiment Next, a multi-track tape recorder according to a second embodiment will be described with reference to FIG. However, in FIG. 4, portions common to FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The tape recorder of FIG.
The tape recorder shown in FIG. 1 includes first, second, and third synchronous signal reproducing heads 31, 32, and 33, and two reproducing amplifiers 3.
4 and 35, two delay circuits 36 and 37, and two changeover switches 38 and 39. Newly provided first, second and third synchronization signal reproducing heads 31, 3
2, 33 is the first 3, which reproduces prior to you erased by the second and third synchronizing signal track TS1, TS2, TS3 erase head 12, a second in the width direction of the tape 1 , Third and fourth heads 9, 10, 1
1 are arranged at the same height position. The first, second and third synchronizing signal reproducing heads 31, 32 and 33 are composed of reproducing amplifiers 34 and 35, delay circuits 36 and 37, and switch 3
8 and 39, the synchronization signal recording / amplifying circuit 1
7 and 20 are selectively connected. The switch 38,
A contact a 39 is a synchronous signal generating circuit 16 and an inverting circuit 19.
Are connected to the recording amplifier circuits 17 and 20. Also erase head
Numeral 12 also erases the synchronization signal tracks TS1, TS2 and TS3.
It is constituted so that.

The delay circuits 36 and 37 include first, second and third delay circuits.
From the sync signal reproducing heads 31, 32, 33
And the same delay as the time required for the tape 1 to travel to the fourth heads 9, 10, 11 is given to the reproduction signal.
Delay circuits 36 and 37 are connected to the tape running device 5 to determine the delay time corresponding to the tape running.

In the case where the synchronization signal is not transferred at the time of erasing in the tape recorder of FIG. 4, the tape recorder is used in the same manner as the tape recorder of FIG. As shown in FIG. 3, when a part of the track T2 or T3 on which the audio signal and the synchronizing signal are recorded is erased by the erase head 12 and another signal is written in this part, the contacts b of the switches 38 and 39 are turned on. Before erasing by the erasing head 12, the first to third synchronization signal reproducing heads 31 to 33 use the synchronization signal tracks TS1 and TSS.
2. The signal of TS3 is read, and is sent to the second to fourth heads 9 to 11 after being delayed. As a result, it is possible to prevent erasure of a synchronization signal that may be erased due to a track shift or the like when rewriting an audio signal.

[0019]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) A control signal or an information signal can be recorded instead of the synchronization signal. (2) Each of the first to fourth heads 8 to 10 can be combined with a recording head and a reproducing head without using the recording and reproducing head. (3) A synchronization signal can be recorded using one of the main tracks T1 to T4. When the synchronization signal track is arranged near the edge of the tape 1, the third synchronization signal track Ts3 can be omitted.

[0020]

According to the present invention, the leakage magnetic flux of the sub information signal
Of the main information signal with less interference due to
be able to. That is, the main information is recorded by the first recording head.
The signal is recorded and the first is
Of the first sub-information signal,
, The second sub-information signal having the opposite phase is also recorded.
When reproducing the main information signal of one track, the second and third
The tracks have opposite phases of leakage flux,
Cancel each other out. Therefore, it is possible to reproduce the main information signal with less interference due to the leakage magnetic flux of the first and second sub information signals.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a tape recorder according to a first embodiment of the present invention.

FIG. 2 is a view showing a gap surface of the composite magnetic head of FIG. 1;

FIG. 3 is a diagram showing a track pattern placed on the magnetic tape of FIG. 1;

FIG. 4 is a block diagram illustrating a tape recorder according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape 8 1st head 9 2nd head 10 3rd head 11 4th head 16 Synchronization signal generation circuit 19 Phase inversion circuit

Claims (1)

(57) [Claims] 1. First recording for recording a main information signal
A first head for recording first and second sub-information signals;
Along the first track formed by the recording heads
To form second and third tracks juxtaposed with each other.
And a third recording head arranged so as to provide the main information signal to the first recording head.
An information signal supply circuit for supplying the first sub information signal to the second recording head;
A first sub-information signal supply circuit, and a third recording head, wherein the phase of the first sub-information signal is inverted.
A second signal for supplying the second sub information signal comprising
A magnetic recording device including a sub information signal supply circuit.