Servo device for disc player

Details Servo device for disc player Servo device for disc player

1989-07-12

1991-09-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369 4429, 369 4435, 369 4436, G11B 7095

Patent

active

050501496

ABSTRACT:
A disc player having digital processing of error signals in a servo system utilizes an A/D converter. The relatively small closed loop error signals are amplified by a predetermined amount above that for the open loop error signals prior to conversion in the A/D converter, and the converter output representing the digitized small error signals are amplified by a predetermined amount below that for the digitized open loop error signals. While the overall gain in the servo system is substantially the same for the closed loop and open loop error signals, the small closed loop error signals are greatly expanded in range at the converter input to permit the same A/D converter to faithfully convert both the open loop and the closed loop error signals.

REFERENCES:
patent: 4742505 (1988-03-01), Takeuchi et al.
patent: 4817073 (1989-03-01), Suzuki

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