Circuit and method for searching track on CD

Details Circuit and method for searching track on CD Circuit and method for searching track on CD

1995-06-13

1997-04-22

Dinh, Tan

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4425, 369 2228, G11B 1722

Patent

active

056234600

ABSTRACT:
A track search circuit includes a command decoder which decodes command data sent by a microcomputer and stored in a command register and outputs signals commanding a track jump and commanding count of a counter which counts a tracking error signal. Time difference between a present A-time and a target A-time is calculated such that an optical pick-up can be moved toward a target position by utilizing the track jump of 4.sup.n. When a counted value of the counter reaches a predetermined value, the A-time is renewed such that the time difference can be reduced by addition or subtraction suitable time data to or from the A-time. If the renewed A-time becomes within 1 minutes with respect to the target A-time in repeating such a track jump in accordance with the renewed A-time, the optical pick-up is stopped to move, and the A-time is read to jump the optical pick-up again to catch the target position.

REFERENCES:
patent: 4694441 (1987-09-01), Tomisawa
patent: 4701898 (1987-10-01), Giddings
patent: 4774699 (1988-09-01), Giddings
patent: 4899325 (1990-02-01), Katsuhara
patent: 5140570 (1992-08-01), Nagasawa

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