Eastman-kodak Company

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Michael G Fairchild

Mark A Barton

A method for detecting and processing synchronization marks extracted from a prerecorded wobbled groove formed in a compact disk in order to produce pseudo-sync signals using a high frequency phase locked loop servoing to the disk speed to generate the signals.

Method for detecting and processing synchronization marks extracted from

A method for detecting and processing ATIP information extracted from a prerecorded wobbled groove formed in a compact disk is disclosed. The prerecorded wobbled groove has a plurality of blocks of information. The method includes extracting an FM signal from the wobbled groove and providing a high frequency phase-lock loop which responds to the extracted FM signal to produce a high frequency clock. The method further includes converting such FM signal into biphase data by sampling and latching the FM ATIP signal from the wobbled groove; and digitally comparing a predetermined count value to a count value derived from the high frequency clock and the FM signal. It further includes extracting a clock signal from a digital phase-lock loop responsive to the biphase data; and providing an ATIP decoder which in response to the biphase data, biphase clock, and high frequency clock signal provides sync detection and address information.

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Dansville, NY, United States of America

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