Disk drive employing a sync mark detector comprising a matched filter and a dual polarity correlator
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United States of America Patent
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Aug 5, 2003
Grant Date -
N/A
app pub date -
Feb 28, 2001
filing date -
Feb 28, 2001
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Abstract
The present invention may be regarded as a disk drive comprising a disk having a plurality of data tracks, each data track comprising a plurality of sectors. A sync mark detector detects a sync mark pattern in a sector by filtering a read signal with a matched filter having an impulse response substantially matched to a dibit response of the disk drive. The output of the matched filter is correlated with a dual polarity correlator to generate first and second correlated signals. The sync mark pattern is detected when either the first or second correlated signals exceeds a threshold.
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