Method and apparatus for reproducing information by varying a se

Details Method and apparatus for reproducing information by varying a se Method and apparatus for reproducing information by varying a se

1988-07-13

1990-11-27

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4434, G11B 700

Patent

active

049742213

ABSTRACT:
This invention relates to an information reproducing method and apparatus in which a phase locked loop (PLL) circuit produces a clock signal from a reproduced signal and includes a sensitivity varying mechanism. The sensitivity of the PLL circuit is increased or decreased relative to when a tracking error signal is low or high, respectively. Further, if the reproduced signal drops, the frequency and phase of the clock signal are held. Then, immediately after the reproduced signal is regained and the hold is released, the sensitivity of the PLL circuit is lowered to a value less than that prior to the drop in the reproduced signal.

REFERENCES:
patent: 4495474 (1985-01-01), Nishikawa et al.
patent: 4587644 (1986-05-01), Fujiie
patent: 4685098 (1987-08-01), Yoshida
patent: 4700334 (1987-10-01), Shinkai
patent: 4737866 (1988-04-01), Ebata
patent: 4809253 (1989-02-01), Baas et al.

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