| 摘要 |
PROBLEM TO BE SOLVED: To provide a jitter detector capable of extracting high precision jitter at high speed. SOLUTION: After performing waveform shaping of a reproduced RF signal 3 detected from an optical disk medium 1, it is converted into a digital RF signal 6 by a sampling clock 8 with a cycle which is twice that of a channel clock. After that, a portion of offset fluctuation of high frequency is compensated by an offset compensation circuit 9, data missed in the time direction is restored by a Nyquist interpolation filter 23. The high precision jitter is extracted by using a digital signal arithmetic circuit 29 after selecting a position for extracting the jitter according to reproduction speed of the optical disk medium 1 and an computing power of the digital signal arithmetic circuit 29 from its output signal by a jitter detection preprocessing circuit 28. COPYRIGHT: (C)2006,JPO&NCIPI
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