Signal processing apparatus and method capable of providing prec

Details Signal processing apparatus and method capable of providing prec Signal processing apparatus and method capable of providing prec

1988-09-27

1990-07-17

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4421, G11B 700

Patent

active

049425633

ABSTRACT:
A light beam detector receiver a light beam reflected from an optical disk and generates two electrical signals, each corresponding to the amount of the light beam. The detector includes an adder for adding the two electrical signals to generate a first operation signal, a subtracter for subtracting one electrical signal from the other to generate a second operation signal, and a converter for converting the second operation signal into digital data in accordance with a conversion gain determined by the amplitude of the first operation signal. The digital data obtained is used for adjusting a position of an objective lens with respect to the optical disk.

REFERENCES:
patent: 4616353 (1986-10-01), Kaneda et al.
patent: 4663750 (1987-05-01), Hamanaka et al.
patent: 4812726 (1989-03-01), Benii et al.
English Translation of West German Patent Application DE 3743884A1.
English Translation of German Patent Office Action Dated 6/14/88.

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