| 摘要 |
PROBLEM TO BE SOLVED: To detect a synchronizing signal to generate a timing signal even when bit shift, etc. is generated in the reproduced synchronizing signal by degradation and density increase, etc. of a recording medium. SOLUTION: In a synchronizing signal detection circuit device, when a wobble pattern of a synchronizing signal is inputted from a synchronous detection circuit 7 in a synchronizing signal detection circuit 8, a first sync pattern comparing section 14 compares the wobble pattern with a first sync pattern which is the same as a sync signal stored in a first storage part 11. A second sync pattern comparing section 15 compares each pattern of the sync signals stored in the second storage part 12 with a second synch pattern specified by one pattern having time fluctuation. A sync signal deciding section 17 decides sync signal detection based on comparison results and synchronization state decision result in a synchronization state deciding section 20 based on comparison results to the previous time. A timing signal generating section 18 generates and outputs a timing signal based on decision output from the sync signal deciding section 17 and the synchronization state stable section 20. COPYRIGHT: (C)2006,JPO&NCIPI
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