JPS6011507B2 - Recording/playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing apparatus for reproducing a recording medium in which adjacent recording tracks have different azimuths, and in particular, to obtain a so-called quick motion image by double-fold reproduction. It was made so that it could be done.

Conventionally, as a method of greatly increasing the amount of video signals recorded on a magnetic tape, it has been proposed to provide adjacent recording tracks adjacent to each other and to make the azimuths of the adjacent recording tracks different from each other.

That is, the rotating magnetic heads IA and IB are provided with an angular interval of 180 degrees from each other, and are rotated at a speed of 30 times per second, and the magnetic tape 2 is rotated approximately 180 degrees along the tape guide drum.
Run diagonally over an angular range of degrees. In this case, the second
As shown in the figure, the width directions, that is, the azimuth angles of the working gaps 3A and 38 of the heads IA and IB are different from each other, for example, 18 and -8. Then, the video signal is converted into a frequency modulated signal that occupies the high side of the recordable band, and this frequency modulated video signal is supplied to the heads IA and IB. Therefore, according to such a recording method, one field of the video signal is recorded obliquely on the magnetic tape 2 as one magnetic track as shown in FIG. Since 0 and -8 are different from each other, tracks a,, a2, a3, etc. correspond to this.
...and q, Q, bゞ..., the azimuth angles are different from each other. Let us now consider the case where such a recording pattern is reproduced by heads IA and IB.

Then, the head IA selects tracks a, a2, a3.
A frequency modulated video signal is reproduced from..., and a frequency modulated video signal is reproduced from tracks q, Q, b3, etc. by head IB, but in this case, head IA and tracks b, b2,... The azimuth angle is different between head IB and tracks a, , a2, a3...... and the frequency modulated video signal is recorded on the Takagi side, so the azimuth angle is different between head IB and tracks a, a2, a3... I
Tracks b,,Q, b3... are not played by head A, and tracks a,,a2,a3... are not played by head IB.
... is not played. Therefore, frequency modulated video signals can be reproduced without causing crosstalk between tracks. Since inter-track crosstalk does not occur in the frequency modulated video signal reproduced in this way, during recording, each adjacent track a. , wide, a2, Q, a3, b3...... or adjacent tracks a,, q, a2, so that there is no guard band between them.
Q. a3. It is possible to record the frequency modulated video signal so that Q.

However, in such a recording and reproducing apparatus, when the running speed of the magnetic tape 2 is doubled to obtain a reproduction so-called quick motion image, when track a is reproduced by the head IA, the speed of the magnetic tape 2 is doubled. Since it is twice as far away, head IB will reproduce track a2, but in this case, head IB and track a2 have different azimuth angles and cannot reproduce the recorded signal due to azimuth loss. Since they operate in the same way sequentially, they have the disadvantage that good quick motion images cannot be obtained. In view of this point, the present invention is designed to enable excellent reproduction of a magnetic tape 2 recorded at high density as shown in FIG. 1 at a double distance.

Hereinafter, one embodiment of the recording/reproducing apparatus of the present invention will be described with reference to FIGS. 3 and 4.

In this example, as shown in FIG.
In addition to the rotating magnetic heads IA and IB, which are spaced apart by 0 degrees, two double-speed read-only heads IC and ID are provided spaced apart by about 180 degrees from each other.

In this case, the line connecting heads IA and IB and the line connecting heads IC and ID are made to intersect at right angles at rotation axis 4. Also the fourth
As shown in the figure, the working gap of the head IC is made to have the same azimuth angle as the working gap of the head IA, and the rotation locus of this head IC is made the same as that of the head IA, and the working gap of the head ID is made to have the same azimuth angle as that of the head IA. The head ID is made to have the same azimuth angle as the operating gap, and the vertical position of the head ID is made to be stepped by one recording track with respect to the head IB, that is, with respect to the head IC. In FIG. 3, 5 is a tape guide drum.
Since the present invention is constructed as described above, the head IC and ID are used for double speed playback, that is, for obtaining quick motion images.

Therefore, depending on the head IC, the magnetic tape 2 as shown in FIG.
When playing track a, the next head ID is that the running speed of magnetic tape 2 is twice as far,
has a level difference of one recording track with respect to the head IC, so track q is reproduced. Therefore, one frame of video signal constituted by tracks a and b is reproduced. Since the magnetic tape 2 runs twice as far, the head IC then reproduces track a3, and then the head ID reproduces track wide. That is, according to the present invention, the head IC
Since the video signal of every other frame is reproduced according to the ID and ID, it is possible to obtain a good double selection reproduction so-called quick motion image. Also, during normal recording and reproduction, heads IA and IB are used in the same way as before, and recording and reproduction are performed in the same way as before. In addition, in the present invention, the head IC and ID
are separated from each other by one recording track, so when the running of the magnetic tape 2 is stopped and the head IC and ID are used for playback, for example, tracks a and Q of the magnetic tape 2 are played back alternately. This has the advantage of being able to perform frame still playback. As described above, according to the present invention, it is possible to obtain a so-called quick motion image by good double distance reproduction of a high-density recording medium in which adjacent recording tracks have different azimuths.

Furthermore, according to the present invention, there is an advantage that frame still images of this recording medium can be easily obtained. In the above embodiment, an example using a magnetic tape has been described, but it goes without saying that other recording media can be used instead. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments and can take various other configurations.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a magnetic tape used in the present invention, FIG. 2 is a diagram showing the positional relationship of a conventional rotary head, and FIGS. FIG. 3 is a diagram showing the positional relationship of heads in one embodiment. IA, IB, IC, and ID are magnetic heads, respectively, and 2 is a magnetic tape. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a recording/reproducing apparatus which reproduces a recording medium in which adjacent recording tracks are recorded with different azimuths, and reproduces the recording medium at twice the running speed of the recording medium at the time of recording. Two double-speed playback heads are provided separated by an angle of approximately 180 degrees, and the two playback-only heads are separated from each other by one recording track to achieve double-speed playback of images in frame units. A recording and reproducing device characterized in that it is capable of obtaining images.