Circuit for varying a loop gain of a spindle servo

Details Circuit for varying a loop gain of a spindle servo Circuit for varying a loop gain of a spindle servo

1994-10-03

1995-07-11

Epps, Georgia Y.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 50, 360 7303, G11B 1700

Patent

active

054327660

ABSTRACT:
In a spindle servo circuit for controlling rotation of a disc, a loop gain of a spindle servo can be varied and a reproduced synchronizing signal from the disc and a reference signal are compared with each other. A phase difference signal and a frequency difference signal that are compared results are chopped by a chopper clock. A loop gain of a servo circuit is varied by varying a duty ratio of the chopper clock and the loop gain can be varied by controlling the duty ratio of the chopper clock in response to a radius of the disc or a revolution rate of the disc.

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Globecom '90, vol. 1, Dec. 1990, NY pp. 518-522, Mahieux et al `Transform Coding of Audio Signals at 64 Kbits/s` *abstract*, *p. 520, left column, line 61-p. 521, left column, line 7-line 18.
EBU Review-Technical, No. 230, Aug. 1988, Brussels BE pp. 158-181, Theile et al `LOW bit-rate coding of high-quality audio signals An introduction to the MASCAM system`, *p. 162, left column, line 17-p. 164, left column, line 2; FIGS. 4,5*.

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