Method and apparatus for a high-speed search of an optical medium
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United States of America Patent
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May 2, 2006
Grant Date -
Sep 30, 2004
app pub date -
Apr 2, 2004
filing date -
Jun 20, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for high-speed searching of an optical medium having a plurality of tracks. Light spots are directed by the apparatus onto the optical medium. As the spots traverse across the tracks in one of a first direction and a second direction, a photodetector unit receives reflected components of the light spots, thus forming respective electrical signals. Digital shaping circuitry converts the electrical signals into digital signals. A quadrature detector receives the digital signals which are arranged in quadrature relationship to each other, and produces an up-count signal indicating the light spots are traversing the tracks in the first direction and a down-count signal indicating the light spots are traversing the tracks in the second direction. A counter counts the up-count signal and the down-count signal to determine a number of tracks traversed by the light spots.
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