 Facsimile data processing apparatus |
| Accordingly, it is an object of the present invention to provide a facsimile data processing ... |
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| Automatic radio frequency signal level control apparatus for a video cassette recorder |
| It is an object of the present invention to provide an automatic RF signal level control apparatus ... |
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| Universal signal processor and method of processing |
| Generally speaking, in accordance with the invention, a method for decoding and reconstructing a ... |
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| Method for preventing error speading while recording compressed image data |
| Accordingly, it is an object of the present invention to provide a compressed image data recording ... |
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| Continuous speed control system for video tape recorder |
| OF THE ILLUSTRATED EMBODIMENT Video tape editing control systems for cassette helical scan video ... |
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| Apparatus for threading magnetic tape from a single reel cartridge in a rotary head tape transport |
| According to the present invention, there is provided in a rotary head magnetic tape recorder, ... |
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| Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
| In accordance with the present invention, the above-described prior art "basic" copy protection ... |
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| Image information recording and reproducing system with aspect ration discrimination |
| It is, therefore, an object of the present invention to provide an image information processing ... |
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Multiplex magnetic recording and reproduction system
| Details |
Inventors: Miura, Kuniaki; Okada, Yoshinori; Fukushima, Isao; Tamura, Teizo;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
In a video tape recorder of the helical scan type, a pair of rotary magnetic heads for the audio signal are provided in addition to the rotary video heads so that the audio signal is recorded on the same slant track as of the video signal on a multiplex basis. The audio head pair is provided with an azimuth angle with opposite polarities from each other and different in value from that of the video head pair. The system has a first operation mode of the standard tape speed and a second operation mode in which the tape is fed at a speed, for example, 1/3 the standard tape speed. The audio and video head pairs are disposed on lines intersecting at right angles with an offset of T.sub.1 /2+T.sub.1 provided in the axial direction of rotation between the two magnetic head pairs, where T.sub.1 is the track pitch of the recording track formed on the tape in the second operation mode. The system produces overlapping tracks for the audio and video signals on the magnetic tape. In the first operation mode, the recording track is formed by a combination of magnetic heads providing an increased difference of azimuth angles between the audio and video heads, while in the second operation mode, the track is formed by a combination of magnetic heads providing a decreased difference of azimuth angles between the audio and video heads. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a magnetic recording and reproduction system capable of multiplex audio signal recording without interfering with the video signal and having a compatibility with the conventional apparatus in reproducing the video signal.
One feature of the present invention is the arrangement of rotary magnetic heads including, in addition to a pair of video heads with gaps of different azimuth angles, an additional pair of heads having different azimuth angles from each other and from those of the video heads, the head arrangement being made such that the audio signal is recorded first on the tape and thereafter the video signal is recorded so as to at least partly overlap the record of the audio signal.
The video and audio heads are disposed to meet the following conditions.
Namely, in the first operation mode in which the tape is fed at the standard speed, each audio head has an azimuth angle which is much different from that of the video head with its majority of record overlapping the record of the audio signal which has been recorded first, and in the second operation mode in which the tape is fed slower, e.
g.
, 1/3 of the standard tape speed, each audio head has an azimuth angle which is less different from that of the video head with its majority of record overlapping the record of the audio signal.
Preferably, the arrangement is made such that a pair of video heads have azimuth angles of +.
theta.
.
sub.
1 and -.
theta.
.
sub.
1 with respect to the line perpendicular to the plane of rotation, while a pair of audio heads have azimuth angles of +.
theta.
.
sub.
2 larger than .
theta.
.
sub.
1 and -.
theta.
.
sub.
2 with respect to the line perpendicular to the plane of rotation, with the line connecting the centers of both video heads intersecting the line connecting the centers of both audio heads at substantially right angles, and with an offset of T.
sub.
1 /2+T.
sub.
1 being made in head axial direction between the video head pair and the audio head pair, where T
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TV Signal 
