Dynamic adjustment of disk-drive pickup signals

Details Dynamic adjustment of disk-drive pickup signals Dynamic adjustment of disk-drive pickup signals

1997-08-22

2000-03-21

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 59, 369124, G11B 700

Patent

active

060410280

ABSTRACT:
Adjustment of disc-drive pickup signals in a manner that responds dynamically to changes in such signals while in use. Adjustment is directed toward achieving an approximately symmetric (i.e., 50-50) duty cycle. A variable integration rate of symmetry error responds to fluctuations in pickup signal frequency to achieve more accurate adjustment of quadrature track crossing signals during a search operation.

REFERENCES:
patent: 5043966 (1991-08-01), Zwaans
patent: 5247501 (1993-09-01), Hashimoto et al.
patent: 5289447 (1994-02-01), Kobayashi et al.
patent: 5291466 (1994-03-01), Kwak
patent: 5293369 (1994-03-01), Melas et al.
patent: 5590103 (1996-12-01), Noda

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