| 摘要 |
An apparatus or method for estimating a radial speed of a disc is suitable for an optical storage device. The apparatus is used in an optical storage device for receiving a pulse signal and an eccentricity, and generating an estimated radial speed of the disc. The apparatus comprises a frequency detector and a sinusoidal wave generator. The frequency detector is used for receiving the pulse signal and then outputs a rotation frequency. The sinusoidal wave generator is used for receiving the rotation frequency and the eccentricity, and then outputs an estimated radial speed value of the disc. As mentioned, the estimated radial speed has an amplitude related to the eccentricity and the rotation frequency, and a frequency related to the rotation frequency, and when a jump direction is changed, the estimated radial speed is zero-crossing
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