JPH03187011A - Magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording/reproducing device.

2. Description of the Related Art In recent years, magnetic recording and reproducing apparatuses have been developed that record and reproduce two types of signals by dividing the recording track into a lower region and an upper region in the tape width direction.

If the two types of signals are the first signal and the second signal, such a magnetic recording/reproducing device can use the first signal as the P signal and the audio as the P signal.
There is a helical scan type VTR that uses a CM signal, that is, a digitalized signal, and a second signal that is an FM modulated video signal.

The configuration of a conventional magnetic recording/reproducing apparatus will be described below with reference to FIGS. 2 and 3. FIG. 2 shows the recording pattern on the tape magnetic surface recorded by the rotating drum. From the head scanning direction A, the first signal recording track 6,
The recording tracks 5 of the second signal are recorded in order. In the figure, a control signal is recorded at 7, and a time code is recorded at 8.

FIG. 3 shows the operating state of the head on the rotating drum 9. As shown in FIG. In FIG. 3, IA.

IB is a recording head for recording or reproducing the first signal;
2A and 2B are reproduction heads for reproducing the second signal; 3A;
3B is an erasing head for erasing the first or second signal. The first signal is recorded in the first signal recording track 6 from 6 degrees to 186 degrees. The second signal is
The time axis is compressed to 210 degrees from 190 degrees after the first signal.
The second signal up to the second signal is recorded on the recording track 5.

Recording heads IA, IB, and playback head 2A.

2B, and the erase heads 3A and 3B each have 180
An erasing head and a reproducing head are placed on the rotating drum 9 and are placed facing each other in the rotating direction.

They are arranged in the order of recording heads.

Next, the insert editing mode in the magnetic recording/reproducing apparatus will be explained below.

The insert editing mode refers to an operation of a magnetic recording/reproducing apparatus in which a new signal is rerecorded and inserted into a portion of the tape where a signal has already been recorded. In the first signal insert editing mode, only the first signal is re-recorded, but editing may not be possible unless the second signal is simultaneously played back and monitored. The insert editing mode in the following description refers to the insert editing mode of the first signal.

Problems to be Solved by the Invention However, in the configuration of such a conventional magnetic recording/reproducing device, in the insert editing mode, the recording head I
When A is recording and forming the recording track 6 of the first signal, the recording head 2A adjacent in the rotational direction must reproduce the recording track 5 of the second signal. In this way, one recording head and one playback head 2A function simultaneously at a close distance, so a part of the electromagnetic waves emitted by the high-frequency recording current flowing through the winding of the recording head IA is transmitted to the playback head 2A.
A large amount jumps into the A winding. In other words, crosstalk occurs from the recording head IA to the playback head 2A, and the playback head 2
A degrades the S/N of the second signal reproduced.

Further, the same relationship holds true for the recording head IB and the reproducing head 2B as for the recording head IA and the reproducing head 2A.

The present invention has been made to solve the above problems, and in insert editing mode, the recording head that is recording and forming the recording track of the first signal is connected to the playback head that is reproducing the recording track of the second signal. reduce crosstalk,
The object is to improve the S/N ratio of the second signal reproduced by the reproducing head.

Means for Solving the Problems In order to solve the above problems, the present invention arranges heads on a rotating drum in the order of a reproducing head, an erasing head, and a recording head from the leading side in the rotational direction.

Effect With the above-described configuration, in the insert editing mode in which only the first signal is re-recorded while reproducing the second signal, when the playback head is reproducing the recording track of the second signal, the recording track of the first signal is The recording heads that record and form recording tracks are located at the rear of the rotating drum with the erasing head sandwiched between them, so that they are sufficiently distant from each other. Therefore, the crosstalk from the recording head to the playback head becomes sufficiently small, and the S/N of the playback output of the second signal from the playback head becomes
The ratio will improve.

EXAMPLE An example of the present invention will be described below with reference to FIG.

In FIG. 1, IA and IB are recording heads that record or reproduce the first signal, 2A and 2B are playback heads that reproduce the second signal, and 3A and 3B are heads that erase the first or second signal. It is.

In FIG. 1, the tape is wound around the rotating drum 8 by 216 degrees, and the first signal is recorded from 6 degrees to 186 degrees. The second signal is time-axis compressed and is 21 degrees from 190 degrees.
It is recorded at 0 degrees. The recording heads IA, IB, the erasing heads 3A, 3B1, and the reproducing heads 2A, 2B are arranged 180 degrees opposite each other, and are arranged in the order of the reproducing head, the erasing head, and the recording head in the rotational direction.

In the above configuration, the operation in the insert editing mode in which only the first signal is rerecorded while reproducing the second signal will be described below.

An erasing head 3 is installed between the recording head 1A and the reproducing head 2A.
Since A is arranged, the distance between the recording head IA and the reproducing head 2A is twice that of the conventional example.

That is, there is a sufficient distance between the reproducing head 2A that is reproducing the recording track 5 of the second signal and the recording head IA that is recording and forming the recording track 6 of the first signal. In other words, the electromagnetic wave component is attenuated by the square of the distance, so from the recording head IA in the recording state to the reproduction head 2A.
The crosstalk to 174 in the conventional example is sufficiently small. Therefore, since the reproducing head 2A is less susceptible to crosstalk from the recording head IA, a reproduced output of the second signal with a good S/N ratio can be obtained.

As is well known, crosstalk to the recording head or reproducing head caused by the erasing current flowing through the erasing head can be reduced by setting the frequency of the erasing current to a frequency higher than the recording band of the first signal and the recording band of the signal tJ2. This problem does not occur because the signal can be easily reduced by passing the signal or the reproduced output of the second signal through a high-cut filter.

Although the recording head IA and the reproducing head 2A have been described above, the same relationship holds true for the recording head IB and the reproducing head 2B.

Note that the recording head may serve both as a head for recording or reproducing the first signal and a head for recording the second signal. Further, the first signal may be, for example, an FM modulated video signal, and the second signal may be, for example, a PCM audio signal. In addition, the recording head and playback head are
It was assumed that one helad tip was attached at one location, but 1
So-called combinator 3 with multiple heads at different locations
It may also be a head. In this way, as a magnetic recording/reproducing device equipped with a combination head, a Y/C separation type VT is used.
There are R or digital modulation type VTRs.

Effects of the Invention As is clear from the above description, according to the present invention, in the insert editing mode, a playback mode in which a recording track of a second signal is reproduced from a recording head that records and forms a recording track of a first signal. Since crosstalk to the head is reduced, the S/N ratio of the second signal reproduced by the reproduction head is improved, a high-quality second signal is obtained, and editing work can be performed easily.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing the operating state of the rotating drum head in the insert editing mode in a magnetic recording/reproducing apparatus according to an embodiment of the present invention; FIG. 2 is a recording pattern diagram as seen from the tape magnetic surface in a conventional apparatus; FIG. 3 is a conceptual diagram showing the head operating state in the video insert editing mode in the conventional example. IA, IB... Recording head, 2A, 2B...
...Reproduction head, 3A, 3B...Erasing head, 4...Tape, 5...Second signal recording track, 6...No. 1 signal recording track.

Claims (1)

[Claims] Recording a first signal and a second signal on a tape, forming a recording track for the first signal in a lower area in the tape width direction, and forming a recording track for the second signal in an upper area in the tape width direction. a recording head for recording or reproducing the first signal; a reproducing head for reproducing the second signal; an erasing head for erasing the first or second signal; , the erasing head;
A magnetic recording and reproducing device comprising a rotating drum in which the recording heads are sequentially arranged.