Compact disk player having an intermediate memory storage device

Details Compact disk player having an intermediate memory storage device Compact disk player having an intermediate memory storage device

1993-10-07

1995-01-03

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 47, 369 32, 369124, G11B 700

Patent

active

053792840

ABSTRACT:
A compact disk player comprising a pickup for reading data on a compact disk, a servo control device for controlling the pickup and a digital signal processing unit for processing the data on the compact disk read by the pickup in a digital form and generating a predetermined clock. According to the invention, the compact disk player comprises a microcomputer for generating first and second clocks, a plurality of addresses and a plurality of clock enable signals and controlling the servo control device upon sensing a focus error from the pickup, the first clock being active high under a normal condition, the second clock being active high upon sensing the focus error from the pickup, a clock generator for generating a reference clock, a clock selection circuit for selecting one of the clocks from the digital signal processing unit and the clock generator in response to the first and second clocks from the microcomputer, a RAM section for, alternately, storing data from the digital signal processing unit and outputting the stored data in response to the addresses and the clock enable signals from the microcomputer and the selected clock from the clock section circuit, and a D/A converter for converting the data from the RAM section into an analog signal under the control of the microcomputer.

REFERENCES:
patent: Re33462 (1990-11-01), Suzuki et al.
patent: 4816928 (1989-03-01), Sasaki et al.
patent: 4964109 (1990-10-01), Yoshioka
patent: 5148417 (1992-09-01), Wong et al.
patent: 5200944 (1993-04-01), Souma
patent: 5224089 (1993-06-01), Matsumura et al.
patent: 5235575 (1993-08-01), Han

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