Servo control system for information storage device
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United States of America Patent
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-
Feb 23, 1999
Issued Date -
N/A
app pub date -
Mar 18, 1998
filing date -
Jan 25, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A servo control system for an optical information storage device includes an optical detector for detecting information stored on an information storage media and for detecting a servo error signal. The optical detector provides a sum information signal output and at least one servo error signal output. A motor is provided for positioning the optical detector relative to the information storage media. An analog to digital converter receives the sum information signal output and the servo error signal output to thereby output a digital servo error signal at a predetermined sampling rate. The digital servo error signal is normalized to the sum information signal by the analog to digital converter. A digital signal processor for processing the digital servo error signal and outputting a servo control signal is provided. The digital signal processor includes a digital servo compensation transfer function for producing the servo control signal. The digital servo compensation transfer function provides a magnitude null with a minimal phase disturbance occurring at a predetermined frequency being approximately one half of the sampling rate. One embodiment includes a driver that receives the servo control signal to control the motor.
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