| 摘要 |
An optical disk drive for scanning an optical disk having a wobbled groove and a land portion separating adjacent parts of the groove. The optical disk drive has a beam generator for generating a read beam and directing the read beam to the optical disk, a sensor for sensing a reflected beam produced by the optical disk upon receiving the read beam and for producing a sensor output signal with a sensor output signal amplitude, and an envelope analyzer to receive the sensor output signal from the sensor, to analyze an envelope (WS1e, WS2e) of the sensor output signal amplitude, and to derive from a variation of the envelope (WS1e, WS2e) as a function of time an indicator indicating whether the read beam is directed to the groove or to the land portion.
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