Digital servo control system including sample integrity tester for reducing effects of spurious sampled position values
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United States of America Patent
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Jun 22, 1999
Issued Date -
N/A
app pub date -
Nov 25, 1997
filing date -
Sep 18, 1990
priority date (Note) -
Expired
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Abstract
In a digital servo control system especially suitable for use in disk drives, a sample integrity tester is provided. Sample measurements, indicating the position of a disk drive's read/write head relative to tracks of information on a recording medium, are subject to error due to noise. The sample integrity tester 2410, 2420, 2430 effectively filters out noise-corrupted measurements and thus prevents clearly erroneous measurements from contaminating calculations performed within the servo controller's control loop. If a measured position signal falls outside a given window (indicating a possible spurious position value has been read), an observer's predicted value is used rather than the spurious value. Using the predicted value allows the loop to operate in a 'freewheel' (open-loop) mode. A preferred implementation of the sample integrity tester involves a coarse window that is static, and a fine window that changes dynamically based on an effort signal.
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