Patent ID: 7136338

Claim:
A control loop bandwidth adjusting method for adjusting a control loop bandwidth of an optical reproducing device, the optical reproducing device comprising a data signal processing circuit which processes a data signal by means of the control loop bandwidth, the adjusting method comprising the steps of: reproducing the data signal from an optical recording medium by the optical reproducing device; according to a predetermined bandwidth value of the control loop bandwidth, processing the data signal by the data signal processing circuit; if a defect data entry signal is detected by the optical reproducing device as reproducing the data signal, adjusting the control loop bandwidth to a first bandwidth value and making the data signal processing circuit process the data signal with the adjusted control loop bandwidth; if a defect data duration signal is detected by the optical reproducing device as reproducing the data signal, adjusting the control loop bandwidth to a second bandwidth value and making the data signal processing circuit process the data signal with the adjusted control loop bandwidth; if a defect data exit signal is detected by the optical reproducing device as reproducing the data signal, adjusting the control loop bandwidth to a third bandwidth value and making the data signal processing circuit process the data signal with the adjusted control loop bandwidth; and if a defect data signal is not detected by the optical reproducing device anymore as reproducing the data signal, recovering the control loop bandwidth value to the predetermined bandwidth value and making the data signal processing circuit process the data signal with the recovered control loop bandwidth.