G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/00 (2006.01) G11B 19/12 (2006.01) G11B 20/10 (2006.01) G11B 20/14 (2006.01)
Patent
CA 1322246
ABSTRACT An apparatus for detecting a read error of an optical recording medium is provided with a reading device which reads data recorded on a data track of an optical recording medium to thereby store the read data in memory therein. This apparatus includes a PLL circuit responsive to a read clock from the optical recording medium for generating a clock synchronized with the read clock, and address upda- ting circuit for updating a write address of the memory to store the read data therein in synchronization with the output clock from said PLL circuit. Also, included are out- of-locking detection circuit for detecting the out-of-locked state of the PLL circuit in response to the read clock and the output clock from the PLL circuit, and address-updating suppression circuit responsive to a detection signal from the out-of-locking detection circuit for suppressing the address updating of the address updating circuit. When the PLL circuit is detected to be in an out-of-locked state, no read data is stored into the memory so that only normal data is acquired in the memory at any time.
585376
Kabushiki Kaisha Csk
Marks & Clerk
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