Reading circuit for optical recording medium

Details Reading circuit for optical recording medium Reading circuit for optical recording medium

G - Physics

11

B

352/32.1, 352/33

G11B 7/007 (2006.01) G11B 20/16 (2006.01)

Patent

CA 1322248

ABSTRACT A reading circuit for an optical recording medium having a clock track having a predetermined optical pattern formed along data tracks and comprising at least one irregular clock bit disposed in a line formed of regular and periodi- cal clock bits, breaking the regularity of the periodically arranged clock bits, which circuit comprises: a phase locked loop (PLL) circuit receiving read clocks obtained by reading the clock track; and an irregular clock detecting means comparing a clock output from the PLL circuit and the read signal and generating a detection pulse when it detects the irregular clock bit which breaks the regularity of the periodically arranged clock bits. According to the present invention, when the PLL circuit is reinstated into the locked position after the PLL circuit has fallen into the out-of-locked position, a leading word can be identified by the irregular clock bit provided in the clock track. There- fore, the read data thereafter can be recognized accurately. This can be attained without lowering the recording capacity of the optical recording medium.

587290

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