Patent ID: 7298674
Filing Date: 2007-11-20
Classification: G11B

Abstract:
1. An apparatus in an optical disk drive for adjusting a control parameter in a control loop of a servo system so as to upgrade system stability after a long-term working, wherein the control loop includes a compensator for issuing a control signal for controlling disk-read/-write operations of the optical disk drive, the apparatus comprising: a signal generator for generating a first sinusoidal signal in response to a first signal parameter, wherein the first sinusoidal signal is delivered to the control loop and is amplified as a second sinusoidal signal; a digital BPF (Band-Pass Filter) for extracting the second sinusoidal signal from the control loop and for deriving a second signal parameter; and a microprocessor for computing a relationship between the second signal parameter and the first signal parameter so as to derive an adjustment signal such that the compensator may adjust the control signal in response to the derived adjustment signal.