Phase-locked loop control for reading data off storage media
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United States of America Patent
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Feb 13, 1990
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N/A
app pub date -
Apr 20, 1988
filing date -
Apr 20, 1988
priority date (Note) -
Expired
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Abstract
An improved phase-locked loop control having a phase detector receptive of a data preamble of all 'ones' from a storage sub-system for producing early and late signals to a voltage controlled oscillator in order for the frequency of the oscillator to be synchronized with the frequency of the data. A pattern detector senses the incoming preamble pulses and prevents the generation of the early and late signals when a preamble pulse is not present within a predetermined window of time.
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