Phase control circuit and magnetic reproducing apparatus using t

Details Phase control circuit and magnetic reproducing apparatus using t Phase control circuit and magnetic reproducing apparatus using t

1981-06-18

1984-11-20

Faber, Alan

Dynamic magnetic information storage or retrieval

Record editing

360 70, 360 77, 360 103, 318314, G11B 2110, H04N 576

Patent

active

044842350

ABSTRACT:
A phase control circuit for improving the stability after a predictable rotational speed change of a rotating apparatus and a magnetic reproducing apparatus for performing slow motion reproduction by means of intermittent tape transport and yet being free from transverse swings of the reproduced picture comprises a phase shift circuit which shifts the phase of the reference signal, which is produced by dividing a source signal, at a desired rate, to maintain the phase locked at the very moment during which the rotational speed change is changing. The relative speed of the magnetic head rotation is kept constant during the intermittent tape movement under the condition of the phase being locked.

REFERENCES:
patent: 3663763 (1972-05-01), Frost
patent: 3742132 (1973-06-01), Sanguu
patent: 3806786 (1974-04-01), Inaba
patent: 4306254 (1981-12-01), Koda
patent: 4322755 (1982-03-01), Kosaka

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