Patent ID: 7447134
Filing Date: 2008-11-04
Classification: G11B

Abstract:
1. A calibration method adapted in an optical disc drive system comprising an optical disk drive controller and an optical pickup head, for compensating a signal that is transmitted by a transmitting module in the optical disk drive controller through a signal channel and received and reshaped by a receiving module in the optical pickup head, to calibrate the duty cycle distortion, the method comprising: providing a periodic test signal having a predetermined duty cycle; delaying the periodic test signal to form an adjusted test signal, and adjusting a delay of an edge between the periodic test signal and the adjusted test signal instructed by a calibration signal; transmitting the adjusted test signal to the receiving module through the signal channel; receiving and reshaping the adjusted test signal to form a received signal; generating a monitor signal for representing a difference between a duty cycle of the received signal and the predetermined duty cycle of the test signal; and generating the calibration signal in accordance with the monitor signal.