PCM helical-scan magnetic record/playback systems
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United States of America Patent
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Feb 28, 1989
Issued Date -
N/A
app pub date -
Apr 22, 1986
filing date -
Jul 19, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a helical-scan magnetic record/playback system, n magnetic heads (where n is an integer greater than one) are disposed close to the outer wall of a head drum, spaced from one another by 2.pi./n radians with respect to the rotational axis of the head drum and also spaced from one another by approximately 1/n of the width of a magnetic tape in the axial direction of the head drum. The magnetic tape is wound around the head drum over an angle of 2.pi./n radians or more with respect to the rotational axis of the drum. With the rotation of the head drum, a video signal is time-sequentially divided for recording on n tracks of the tape and for reproduction therefrom. The invention results in reduced friction between the tape and the drum, thereby providing smooth travel and easy loading of the tape. According to this invention, a still or slow-motion picture can be reproduced without an external memory and the reciprocal travel of the tape.
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