Optical disk player with a digital servo-control circuit incorpo

Details Optical disk player with a digital servo-control circuit incorpo Optical disk player with a digital servo-control circuit incorpo

1994-06-09

1997-04-22

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, G11B 7095

Patent

active

056234651

ABSTRACT:
An optical disk player provided with a digital servo circuit uses a time-sharing multifunctional digital filter, in which a plurality of filter functions are realized with a single filter. By lowering the sampling frequency of the plurality of digital filter functions than the master clock of the signal processing circuit and operating the plurality of digital filters on a time-sharing basis, the number of steps of the signal processing command can be decreased and the circuit scale can be reduced. By constructing a High Pass Tracking Zero Cross HPF and an anti-shock BPF of a digital filter using the same step, reduction in the circuit scale and increase in the sampling rate can be attained.

REFERENCES:
patent: 4203008 (1980-05-01), Cohn-Sfetcu et al.
patent: 4817073 (1989-03-01), Suzuki
patent: 4942567 (1990-07-01), Shiba
patent: 5056074 (1991-10-01), Tateishi et al.
patent: 5065386 (1991-11-01), Takeya et al.
patent: 5265081 (1993-11-01), Shimizume et al.
Harman, Thomas L., The Motorola MC 68000 Microprocessor Family, 1985, pp. 22-28.
B. P. Lathi, "Modern Digital and Analog Communication Systems", 1983, pp. 81 and 52.

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