Apparatus and method for detecting a sync pattern and an address mark within data provided from a recording medium
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United States of America Patent
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Aug 26, 1997
Grant Date -
N/A
app pub date -
Mar 14, 1996
filing date -
Mar 20, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A disk apparatus for reproducing pulse width modulation (PWM) data from a disk is disclosed. A first sync pattern detector compares data DTLE with a first sync pattern. A second sync pattern detector compares data DTTE with a second sync pattern. A first signal generator stops the detecting operation of the first detector when the first detector has detected the first sync pattern from the data DTLE. A second signal generator stops the detecting operation of the second detector when the second detector has detected the second sync pattern from the data DTTE. A first time check circuit restarts the detecting operation of the first detector when the first sync pattern has been detected first and the second sync pattern is not detected within a predetermined period of time. A second time check circuit restarts the detecting operation of the second detector when the second sync pattern has been detected first and the first sync pattern is not detected within a predetermined period of time.
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