Tracking servo circuit for an optical disc player

Details Tracking servo circuit for an optical disc player Tracking servo circuit for an optical disc player

1995-02-03

1996-12-31

Sniezek, Andrew L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 700

Patent

active

055901034

ABSTRACT:
A tracking servo circuit in which a tracking error signal obtained when tracking servo at disc player initialization is off is captured, its center level is calculated, the calculated center level is held in a register 17, and the center level held in the register 17 is subtracted from a tracking error signal obtained when the tracking servo is on. Consequently, an offset of the tracking error signal caused by a sensitivity imbalance between tracking servo photodiodes due to their aging or the like is detected to be securely corrected, thereby enhancing playability of a disc player in which the tracking servo circuit according to the invention is used.

REFERENCES:
patent: 4817073 (1989-03-01), Suzuki
patent: 5048002 (1991-09-01), Horie et al.
patent: 5054013 (1991-10-01), Kawamura
patent: 5195067 (1993-03-01), Yanagi
patent: 5202864 (1993-04-01), Moriya et al.
Patent Abstracts of Japan vol. 12, No. 309 (P-748) 23 Aug. 1988.
Patent Abstracts of Japan vol. 9, No. 195 (P-379) 13 Aug. 1985.
Patent Abstracts of Japan vol. 15, No. 268 (P-1224) 8 Jul. 1991.

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