Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-04-22
1999-01-12
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4434, G11B 700
Patent
active
058598162
ABSTRACT:
A tracking control system for use in a digital video disc (DVD) system requires generation of a precise error tracking signal. A tracking control system has an optical detector for reading a light beam reflected from a light beam spot radiated on a recording medium. Errors in tracking are detected and controlled by a tracking error signal generated in part through pulse shaping circuits controlled by a differential amplifier. Phase difference pulses generated by the pulse shaping circuits are free from noise impulses and other anomalies which could affect accurate tracking. The differential amplifier enables regulation of a phase difference offset and eliminate noise impulses while still maintaining the frequency characteristics necessary for high density recording mediums.
REFERENCES:
Patent Abstracts of Japan, Mar. 1992 re JP 04/067324.
Patent Abstracts of Japan, Apr. 1990 re JP 02/108244.
Patent Abstracts of Japan, Aug. 1986 re JP 61/188746.
Hindi Nabil
Kabushiki Kaisha Toshiba
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