Signal reproducing apparatus providing PLL circuit controlled by

Details Signal reproducing apparatus providing PLL circuit controlled by Signal reproducing apparatus providing PLL circuit controlled by

1995-03-30

1995-12-05

Epps, Georgia Y.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

360 7302, G11B 509

Patent

active

054735882

ABSTRACT:
A signal reproducing apparatus for reading out signals recorded along with clock signals on a recording medium. The relative velocity between a magnetic tape and magnetic heads mounted on a rotary drum is sensed by a rotary drum rotational velocity sensor and the center oscillation frequency of a VCO in a clock-reproducing PLL circuit of signal reproducing circuitry is changed in accordance with the sensed relative velocity for controlling the center oscillation frequency to be equal to the frequency of the clock components of the reproduced RF signals. The clock signal components may be reproduced as usual even though the frequencies of the clock components of the playback RF signals are changed. Moreover, fluctuations in the relative velocity between the magnetic tape and the magnetic head may be tolerated to diminish the load on the velocity servo control operation as well as to reduce power consumption and expedite the operation.

REFERENCES:
patent: 4413289 (1983-11-01), Weaver et al.
patent: 4851932 (1989-07-01), Scheer et al.

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