Patent ID: 7567054
Filing Date: 2009-07-28
Classification: G11B,H02P

Abstract:
1. A control circuit for controlling a rotation frequency of a spindle in an optical disc drive, the control circuit comprising: a spindle controller, electrically coupled to the spindle, for driving the spindle to rotate an optical disc in a first disc rotation mode or in a second disc rotation mode according to a rotation control signal; a detector, electrically coupled to the spindle, for detecting the rotation frequency of the spindle, and for generating a first detecting signal associated with the first disc rotation mode or generating a second detecting signal associated with the second disc rotation mode; a frequency-adjusting module, electrically coupled to the detector, for adjusting and outputting at least one of a first output signal and a second output signal to reduce a frequency difference therebetween, wherein the first output signal is generated corresponding to the first disc rotation mode, and the second output signal is generated corresponding to the second disc rotation mode; and a signal selector, electrically coupled to the frequency-adjusting module and the spindle controller, for receiving the first or second output signals generated from the frequency-adjusting module and outputting the rotation control signal according to the optical disc rotated in the first disc rotation mode or the second disc rotation mode, wherein the rotation control signal corresponds to the first output signal when the optical disc is rotated in the first disc rotation mode, and the rotation control signal corresponds to the second output signal when the optical disc is rotated in the second disc rotation mode.