| 摘要 |
PROBLEM TO BE SOLVED: To reduce an AD converter and a circuit for digital-processing of a layer discriminating signal. SOLUTION: One AD converter 103 is constituted by making an AD converter for tracking error signal and an AD converter for layer discriminating signal common by not generating a tracking error signal when the layer discriminating signal is used or reducing sampling. The layer discriminating signal is generated selectively or in time-division manner only when processing in which the layer discriminating signal is used is performed. Thereby, such optical disk control apparatus can be constituted with less circuit scale that the tracking error signal is not generated when the layer discriminating signal is used, or sampling is reduced. COPYRIGHT: (C)2007,JPO&INPIT
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