Asynchronous digital demodulator and method for a null-type servo pattern
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Mar 15, 1999
filing date -
May 21, 1998
priority date (Note) -
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Abstract
An asynchronous demodulator and method is provided which determines a position error of a read head relative to a position on a medium in a storage device. The read head generates a read signal as the read head passes over a servo area on the medium. The demodulator generates a normal demodulating signal that is asynchronous with the read signal and a quadrature demodulating signal that is ninety degrees out of phase with the normal demodulating signal. The read signal is sampled to produce a series of digital read values which are multiplied by the normal demodulating signal and the quadrature demodulating signal to produce a plurality of normal and quadrature sample values. The demodulator produces the a position error magnitude and a position error direction based on the plurality of normal and quadrature sample values.
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