Synchronizing signal detector for multi-beam optical disk unit
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United States of America Patent
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Jul 19, 1994
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app pub date -
Nov 30, 1992
filing date -
Dec 14, 1989
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Abstract
There is disclosed a synchronizing signal detector for a multi-beam optical disk unit employing a semiconductor laser array as an optical head, in which detection of a synchronizing signal is performed when all-bit coincident is detected in one half or more of multi-beams or when almost all-bit coincident is detected for a beam within a small number of bits before or after the all-bit coincident in another beam. Once a first synchronizing signal of each sector is detected, synchronizing signals of the subsequent second, third, . . . blocks can be detected without fail through utilization of a flywheel signal generator
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