| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device which generates an accurate control clock. SOLUTION: The optical disk device has a wobble signal generation part which generates a wobble signal having a frequency based on the periodic shape of a wobble, an RF signal generation part which generates an RF signal which is a reproduced data signal from an optical disk and a control clock generation circuit 110 which inputs the wobble signal and the RF signal to output the control clock for controlling rotation speed of the optical disk or transfer rate of recording data, generates a channel clock of frequency higher than that of the wobble signal from the RF signal, generates a prepit detection signal indicating that prepit information is detected from the RF signal using the channel clock, generates a reference signal having a frequency of 1/n of accurate wobble frequency by a period of the prepit detection signal and the number n of wobbles existing between headers and synchronizes a frequency of a frequency division signal of the control clock with the frequency of the reference signal. COPYRIGHT: (C)2006,JPO&NCIPI
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