| 摘要 |
PROBLEM TO BE SOLVED: To provide technology by which a DVD-RAM, DVD-R, DVD+R, DVD-RW, DVD+RW, and DVD-ROM can be discriminated in a short period of time. SOLUTION: This device discriminates a DVD-RAM based on tracking error signals of different radius position on a disk, further, and discriminates DVD+R, DVD-R, DVD-ROM, DVD-RW, and DVD+RW based on Wobble detected from the tracking error signal through a band pass filter. COPYRIGHT: (C)2004,JPO&NCIPI
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