| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of detecting a DC component of a reproduced signal in areas having different characteristics in a medium even if phases of the reproduced signal and a reproduced clock are different from each other during reproduction of a DVD-RAM disk or the like in the circuit of the optical disk device. SOLUTION: The circuit (LSI100) of the optical disk device for reproducing a disk 1 is provided with an A/D converter 9 for performing A/D conversion by a predetermined reproduced clock, first and second DC detection circuits 17a and 17b for detecting the DC component (DC) of an A/D converted (and waveform-equalized) reproduced signal, first and second DC elimination circuits 13a and 13b for eliminating the detected DC, and switches 12a to 12d for switching control. The circuit detects and eliminates, through switching control, the DC of the reproduced signal even if the phase relation of the reproduced signal and the reproduced clock varies. COPYRIGHT: (C)2009,JPO&INPIT
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