Circuit for digitally generating a tracking error signal to avoi

Details Circuit for digitally generating a tracking error signal to avoi Circuit for digitally generating a tracking error signal to avoi

1988-05-23

1990-06-19

Canney, Vincent P.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 2502015, G11B 709

Patent

active

049359126

ABSTRACT:
A circuit for computing a tracking error signal digitally. Under control of appropriate timing, input RF signals are latched in successive latches, and outputs of the latches are compared. The latch (9) whose output is D/A converted as a tracking error signal is controlled by suitable logic (25) to latch an output of a preceding latch (8), that output being used to provide input to the logic (25) through a threshold circuitry which includes adders (21,22) and comparators (14,15). The circuit takes advantage of servo patterns on surfaces of disks, particularly optical disks, to provide track count and on-track status. The digital approach removes the necessity for using capacitors or other types of sample-and-hold circuitry, and for controlling offset values.

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patent: 4234837 (1980-11-01), Winslow
patent: 4236105 (1980-11-01), Wilkinson
patent: 4305123 (1981-12-01), Scibor-Rylski
patent: 4396832 (1983-08-01), Henderson
patent: 4408314 (1983-10-01), Yokota
patent: 4568887 (1986-02-01), Bierhoff
patent: 4611315 (1986-09-01), Ogino
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patent: 4740940 (1988-04-01), Tanaka et al.
patent: 4748609 (1988-05-01), Yonezawa et al.
patent: 4785442 (1988-11-01), Ohtake et al.
patent: 4851750 (1989-07-01), Yamazaki

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