Recording disk reproducing apparatus having high-resolution A/D

Details Recording disk reproducing apparatus having high-resolution A/D Recording disk reproducing apparatus having high-resolution A/D

1987-06-15

1989-05-30

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, G11B 700

Patent

active

048357553

ABSTRACT:
A recording disk reproducing apparatus employing simplified digital servo control for lower-cost, more stable operational control of the apparatus. At least one of a focusing servo loop, a tracking servo loop, a spindle servo loop, and a time base servo loop employs digital conversion of an analog error signal for processing in a microprocessor. The analog-to-digital conversion circuitry has an input-output characteristic which varies in accordance with error signal level, enabling a reduction in the number of bits of A/D output necessary, and reducing cost.

REFERENCES:
patent: 4286318 (1981-08-01), Immink et al.
patent: 4482987 (1984-11-01), Okada et al.
patent: 4603410 (1986-07-01), Yoshida
patent: 4628497 (1986-12-01), Bierhoff
patent: 4726004 (1988-02-01), Takasago et al.

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