Abstract: Optical disc apparatuses. The apparatus comprises an optical pickup and a data recovery unit. The optical pickup irradiates laser light onto a disc, receives light reflected from the disc, and generates an RF signal in response to the received light. The data recovery unit comprises a first configuration and a second configuration. The data recovery unit receives the RF signal from the optical pickup, reproduces data according to the RF signal in the first configuration, and performs a signal quality index measurement of the RF signal in the second configuration.

Abstract: A control circuit of an optical storage device includes a loop phase calculation unit for calculating a closed loop phase of a servo system according to at least one error signal of the servo system and a system control unit coupled to the loop phase calculation unit for generating an optimized control parameter according to the closed loop phase to perform compensation control, wherein the servo system comprises a tracking servo control system or a focusing servo control system, the compensation control is radial tilt control or focus balance adjustment, and the optimized control parameter is at least one optimized control parameter determined according to a plurality of closed loop phases calculated by the loop phase calculation unit.

Abstract: A detector is scanned across an optical storage medium having groove tracks and land tracks, each track having a wobble structure, to detect light reflected from the optical storage medium. A wobble signal and a tracking error signal are generated based on an output of the detector, and the wobble signal is sampled according to the tracking error signal. A determination about whether the detector is at the groove track or the land track is made based on the tracking error signal and a comparison of sampled values of the wobble signal.