Methods and apparatus for regenerating track crossing signals for searches across unrecorded areas on read/write optical discs
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United States of America Patent
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Oct 29, 2002
Grant Date -
N/A
app pub date -
Dec 23, 1999
filing date -
Dec 23, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fast-acting method of regenerating track crossing signals for track searches across unrecorded areas on read/write optical discs is provided. This is accomplished by comparing the in-phase and quadrature-phase track crossing signals generated by the optical pickup head when a track search is being performed. A blank signal is generated when no quadrature-phase signal transition occurs between two successive in-phase signal transitions. Fake quadrature-phase signals are continuously generated. Upon occurrence of a blank indicating signal, the fake quadrature-phase signals are immediately supplied to the track crossing counter mechanism in place of the missing quadrature-phase signals. As a result, there is no loss of track count.
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