JPH0325288Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention provides a rotating magnetic head type PCM magnetic recording and reproducing device that does not cause deterioration in sound quality even when overlapping recording is repeated. be.

(Prior art and problems) In recent years, with the spread of magnetic recording equipment, it has become possible for one person to play an orchestra by overlapping the sounds obtained by playing multiple types of instruments one after another. You can create sounds similar to Natsuta's, create chorus sounds by yourself, or freely combine various sounds from the natural world and the world to create sounds that describe your favorite environment. It is now being widely attempted.

By the way, if the magnetic recording device used for recording is configured to record and play back analog signals,
It is important to create works with good sound quality because the quality of the recorded signal deteriorates each time overlapping recording is performed due to nonlinear distortion, noise, etc. that are always present in the recording and playback system. was difficult.

(Means for solving the problem) The present invention is a rotating magnetic head type that allows easy overlapping recording using PCM signals without deteriorating the signal quality even when overlapping recording is performed.
A PCM magnetic recording/reproducing device, that is, a first pair of magnetic heads consisting of a first and second magnetic head occupying positions 180 degrees symmetrical with respect to the center of rotation, and orthogonal to the first pair of magnetic heads described above. The above-mentioned first magnetic head constitutes a second magnetic head pair consisting of a third and a fourth magnetic head, which are in a positional relationship of 180 degrees symmetrical with respect to the center of rotation.
A rotating drum in which each of the fourth to fourth magnetic heads is provided in such a manner that each magnetic head exhibits a different azimuth angle, a magnetic head belonging to the first magnetic head pair provided on the above-mentioned rotating drum, and a second magnetic head. means for running the magnetic tape so that adjacent recording tracks are formed in sequence on the magnetic tape by the magnetic heads belonging to the pair of magnetic heads;
In a state in which a magnetic head belonging to one of the selected magnetic head pairs is used for recording information signals, a magnetic head belonging to the other magnetic head pair is used for reproducing information signals. and means for supplying a PCM signal based on a superimposed signal of the reproduced information signal and an external signal to the magnetic head pair used for recording the information signal. a rotating magnetic head type comprising means for
The present invention provides a PCM magnetic recording/reproducing device in which the above-mentioned conventional problems can be solved.

(Embodiments) Hereinafter, specific details of the rotating magnetic head type PCM magnetic recording and reproducing apparatus of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a rotating magnetic head type PCM magnetic recording/reproducing apparatus of the present invention. In FIG. 1, HD is a rotating head drum; The first to fourth magnetic heads Ha, Hb, Hc are located at positions dividing the circumferential direction into four equal parts.
Hd is provided, and is rotated at a predetermined number of rotations at a high speed in the direction of arrow R around the rotating shaft 1 by a drive mechanism (not shown).

T is a magnetic tape, and the magnetic tape is wound around the outer periphery of the rotating head drum HD in a state where slightly more than half of the magnetic tape is wound around the head drum HD, so-called an omega winding state, and a tape (not shown) is wound around the head drum HD. The traveling system causes the vehicle to travel in the direction of arrow X at a predetermined traveling speed. Reference numerals 2 and 3 in the figure are guide poles that guide the magnetic tape.

The above-mentioned rotary head drum HD includes the above-mentioned four magnetic heads Ha to Hd (four recording and reproducing heads Ha).
~Hd), an erasing head is provided in a position preceding those heads, and a mechanism for transmitting signals between the rotating magnetic head and a fixed part is provided. In FIG. 1, illustration of these parts is omitted in order to avoid complication of illustration.

Of the four magnetic heads Ha to Hd provided on the rotary head drum HD, the first magnetic head Ha and the second magnetic head Hb, which occupy positions 180 degrees symmetrical with respect to the rotation center, are the first magnetic head Ha and the second magnetic head Hb. A third magnetic head Hc constitutes a pair of magnetic heads, and is positioned perpendicular to the first pair of magnetic heads and 180 degrees symmetrical with respect to the center of rotation. The fourth magnetic head Hd constitutes a second magnetic head pair.

Then, the first magnetic head Ha mentioned above and the second magnetic head Ha are connected to each other.
a first magnetic head pair consisting of a magnetic head Hb, a third magnetic head Hc and a fourth magnetic head Hd;
Each of the first to fourth magnetic heads Ha to Hd forming a second magnetic head pair consisting of
are provided on the rotating head drum HD in such a manner that they each exhibit different azimuth angles.

FIG. 2 shows that a magnetic tape is loaded by magnetic heads Ha and Hb belonging to the first pair of magnetic heads and Hc and Hd belonging to the second pair of magnetic heads provided on the rotary head drum HD. FIG. 2 is a diagram showing sequential recording traces formed on the magnetic tape T, and a in FIG. It is a record trace pattern, and
b in FIG. 2 is a second predetermined magnetic tape running speed V/2, which is half the predetermined first predetermined magnetic tape running speed V.
This is a recording trace pattern of the magnetic tape when the magnetic tape T is run at .

In Fig. 2 a, b, etc., the codes written in the frames indicating sequential recording traces on the magnetic tape T are the codes of the magnetic heads used to form the respective recording traces. In Figure 2b, the reason why the numbers of the magnetic heads belonging to the first pair of magnetic heads and the numbers of the magnetic heads belonging to the second pair of magnetic heads are written together in the frame of the recording trace is that
This shows that the recording trace pattern as shown in the figure is formed by either one of the first pair of magnetic heads and the second pair of magnetic heads.

The magnetic heads Ha and Hb belonging to the first pair of magnetic heads provided on the rotary head drum HD are connected to the movable contact 6 of the changeover switch SW1, and the magnetic heads c, Hb belonging to the third pair of magnetic heads are connected to the movable contact 6 of the changeover switch SW1. Hd is the movable contact 7 of the changeover switch SW2
It is connected to the.

The aforementioned changeover switch SW1 and changeover switch
SW2 is an interlocking changeover switch, and the fixed contact 9 of the changeover switch SW1 is connected to the external terminal 4, and the fixed contact 11 of the changeover switch SW2 is connected to the external terminal 5.

Therefore, when the movable contacts 6 and 7 of the changeover switches SW1 and SW2 are switched to the fixed contacts 9 and 11, the first to fourth magnetic heads Ha to Hb provided on the rotary head drum HD are connected to the external terminals. 4,
5.

The fixed contact 8 of the changeover switch SW1 is connected to the fixed contact 12 of the changeover switch SW3 and the changeover switch SW1.
Furthermore, the fixed contact 10 of the changeover switch SW2 is connected to the fixed contact 15 of the changeover switch SW4, and the fixed contact 16 of the changeover switch SW3.
It is connected to the fixed contact 13 of.

The aforementioned changeover switch SW3 and the changeover switch
SW4 is a changeover switch interlocked with the changeover switch SW3, and the movable contact 14 is connected to the recording amplifier.
It is connected to the output side of RA, and the movable contact 17 of changeover switch SW4 is connected to the input side of regenerative amplifier PA.

In FIG. 1, PE is a PCM encoder, and PD is a PCM decoder. These PCM encoder PE, PCM decoder PD, etc.
Technical file STC-007 “Consumer use
PCM encoder. It is desirable that the device be manufactured to meet the standards listed in the "Decoder".

Ar, Ap, etc. in Figure 1 are amplifiers, respectively.
Also, MIX is a mixing circuit, 18 is an output terminal,
Reference numeral 19 is an input terminal for a signal used for newly added recording.

In the rotating magnetic head type PDCM magnetic recording and reproducing apparatus of the present invention configured as described above, the movable contact 6 of the changeover switch SW1 is switched to the fixed contact 8 side, and the movable contact 7 of the changeover switch SW2 is switched to the fixed contact 8 side.
is switched to the fixed contact 10 side, first, the movable contact 14 of the changeover switch SW3 is switched to the fixed contact 12 side, and the movable contact 17 of the changeover switch SW4 is switched to the fixed contact 12 side.
are switched to the fixed contact 15 side, the running speed of the magnetic tape T is set to the above-described first predetermined magnetic tape running speed V, and the magnetic tape T is run to perform a recording/reproducing operation. In this case, magnetic heads Ha and Hb belonging to the first pair of magnetic heads provided on the rotary head drum HD and magnetic heads Hc and Hd belonging to the second pair of magnetic heads provide magnetic The sequential recording marks formed on the tape T form a pattern as shown by a in FIG.

When the movable contact 14 of the changeover switch SW3 is switched to the fixed contact 12 side and the movable contact 17 of the changeover switch SW4 is switched to the fixed contact 15 side, the first pair of magnetic heads provided on the rotating head drum HD Belonging magnetic head Ha, Hb
Since the magnetic heads Hc and Hd belonging to the second pair of magnetic heads operate as reproducing heads, in the sequential recording traces formed on the magnetic tape T, In the recording traces Ha, Hb...Ha, Hb, etc. in a of the figure, the PCM signal output from the recording amplifier RA is recorded by the magnetic heads Ha, Hb belonging to the first magnetic head pair, and the second From the recording traces Hc, Hd...Hc, Hd, etc. in a of the figure, the PCM signals recorded on the recording traces Hc, Hd, etc. are reproduced by the magnetic heads Hc, Hd belonging to the second magnetic head pair. Ru.

In the above operation, if no signal is recorded on the recording traces Hc, Hd... (for example, when recording is performed on a new magnetic tape for the first time)
includes a magnetic head belonging to the second magnetic head pair.
Naturally, no signals are reproduced from Hc and Hd.

magnetic head Hc belonging to the second magnetic head pair,
The PCM signal reproduced from the HD is amplified by an amplifier PA, then converted into an analog audio signal by a PCM decoder PD, and amplified by an amplifier Ap.
given to the mixing circuit MIX.

The mixing circuit MIX creates a superimposed signal of the signal supplied to the input terminal 19 and the output signal from the amplifier Ap described above, and supplies it to the amplifier Ar in the recording system. It goes without saying that the mixing ratio of both signals in the mixing circuit MIX can be adjusted as desired.

The output signal from the amplifier Ar described above is converted into a PCM signal by the PCM encoder PE, amplified by the recording amplifier RA, and then supplied to the magnetic heads Ha and Hb belonging to the first magnetic head pair to be recorded on the magnetic tape. Ru. Furthermore, since the output signal from the amplifier Ap of the reproduction system described above is output to the output terminal 18, the audio signal output to the output terminal 18 can be appropriately utilized.

In the embodiments described above, the signals are mixed in the form of analog signals, but it goes without saying that the present invention may be implemented by mixing the signals in the form of digital signals.

As before, changeover switches SW3 and SW4
When the recording operation on the magnetic tape T is completed with the movable contacts 14 and 17 switched to the fixed contacts 12 and 15 side, the magnetic tape T is rewound, and this time the movable contacts of the changeover switch SW3 are switched to the fixed contacts 12 and 15 side. 1
4 is switched to the fixed contact 13 side, and the movable contact 17 of the changeover switch SW4 is switched to the fixed contact 16 side, and the magnetic tape T is run at the first predetermined magnetic tape running speed V mentioned above. to perform recording and reproducing operations.

In this case, contrary to the recording/reproducing operation described above, the second
The magnetic heads Hc and Hd belonging to the magnetic head pair are
Since the magnetic heads Ha and Hb belonging to the first pair of magnetic heads operate as recording heads, and the magnetic heads Ha and Hb belonging to the first pair of magnetic heads operate as read heads, the magnetic heads Hc and Hd belonging to the second pair of magnetic heads In the sequential recording traces formed on the magnetic tape T,
In the recording traces Hc, Hd...Hc, Hd, etc. in a of FIG.
Hd, and from the recording traces Ha, Hb...Ha, Hb, etc. in a of FIG. The PCM signal recorded on ... is played back.

As described above, changeover switches SW3 and SW
4 movable contacts 14, 17 are fixed contacts 13, 16
When the recording operation on the magnetic tape T is completed in the state where the switch SW3 is switched to the side, the magnetic tape T is rewound, and then the movable contact 14 of the changeover switch SW3 is set to the fixed contact 12 side again, and the changeover switch SW3 is turned back to the fixed contact 12 side.
With the movable contacts 17 of the SW4 switched to the fixed contacts 15, the magnetic tape T is run at the first predetermined magnetic tape running speed V to perform recording and reproducing operations.

By repeating the above recording operation, a mixed signal of the signal supplied to the input terminal 18 and the signal reproduced from the magnetic tape T is recorded on the magnetic tape T. be.

(Effects) As is clear from the detailed explanation above, the rotating magnetic head type PCM magnetic recording and reproducing device of the present invention has first and second magnetic heads that are symmetrical at 180 degrees with respect to the center of rotation. a first pair of magnetic heads, and third and fourth magnetic heads, which are perpendicular to the first pair of magnetic heads and 180 degrees symmetrical with respect to the center of rotation. a rotating drum in which each of the first to fourth magnetic heads constituting a second pair of magnetic heads and the like exhibits different azimuth angles; The magnetic tape is moved so that adjacent recording traces are sequentially formed on the magnetic tape by a magnetic head belonging to a first pair of magnetic heads and a magnetic head belonging to a second pair of magnetic heads provided on the magnetic tape. and a means for causing the magnetic head to travel, and in a state where the magnetic head belonging to the selected one of the first and second magnetic head pairs is used for recording an information signal, the magnetic head belonging to the other magnetic head pair means for bringing the magnetic head into a state where it is being used for reproducing information signals; according to the signal
A rotating magnetic head type PCM magnetic recording/reproducing device comprising means for supplying a PCM signal, a first magnetic head pair consisting of magnetic heads Ha and Hb provided on a rotating head drum HD; A second pair of magnetic heads consisting of magnetic heads Hc and Hd are sequentially and alternately used for recording and reproducing to record the audio signal as a PCM signal on the magnetic tape.
The rotating magnetic head type PCM magnetic recording and reproducing apparatus of the present invention can reproduce the signal and record the signal obtained by adding other input signals to the signal reproduced from the magnetic tape one after another. It is possible to perform overlapping recording many times without any overlapping recording, and all of the conventional problems mentioned above can be satisfactorily solved.
Furthermore, if the recording and reproducing operation is carried out by setting the running speed of the magnetic tape to half of the running speed of the magnetic tape during the above-described operation, recording and reproducing will be performed by only one pair of magnetic heads.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the rotating magnetic head type PCM magnetic recording and reproducing apparatus of the present invention, and FIG. 2 is a diagram showing a recording trace pattern on a magnetic tape. HD...rotating head drum, Ha~Hd...first to fourth magnetic heads, SW1~SW4...changeover switch,
PE...PCM encoder, PD...PCM decoder,
MIX…Mixing circuit.

Claims (1)

[Claims for Utility Model Registration] 1. A first pair of magnetic heads consisting of a first and second magnetic head occupying positions 180 degrees symmetrical with respect to the center of rotation, and the first pair of magnetic heads described above. The above-mentioned first to fourth magnetic heads constitute a second magnetic head pair consisting of a third magnetic head and a fourth magnetic head, which are orthogonal to each other and occupy positions 180 degrees symmetrical with respect to the center of rotation. a rotary head drum provided in such a manner that each of the magnetic heads exhibits a different azimuth angle;
by the magnetic head belonging to the magnetic head pair and the magnetic head belonging to the second magnetic head pair,
means for running the magnetic tape so that adjacent recording traces are formed on the magnetic tape; and a means for recording information signals by a magnetic head belonging to a selected one of the first and second pairs of magnetic heads. means for bringing the magnetic head belonging to the other pair of magnetic heads into a state where it is being used for reproducing information signals, and the magnetic head being used for recording information signals; A rotating magnetic head type PCM magnetic recording and reproducing apparatus comprising means for supplying a PCM signal based on a signal obtained by superimposing a reproduced information signal and an external signal to the pair. 2. The rotating magnetic head type PCM magnetic recording and reproducing apparatus according to claim 1, which is provided with a switching means that allows the first to fourth magnetic heads to be directly connected to external terminals. 3. The rotating magnetic head type PCM magnetic recording and reproducing apparatus according to claim 1, which is equipped with means for reducing the running speed of the magnetic tape by half.