Patent ID: 7782721
Filing Date: 2010-08-24
Classification: G11B

Abstract:
1. A method of calibrating operating parameters in an optical disk drive over a plurality of zones, the optical disk drive including a plurality of photodetectors producing a corresponding plurality of photodetector signals, wherein the optical disk drive includes a plurality of amplifiers corresponding to the plurality of photodetector signals such that each photodetector signal is individually gain-adjusted by its corresponding amplifier, the plurality of amplifiers thereby producing a plurality of gain-adjusted photodetector signals, the method comprising: providing a digital signal processor configured to receive digitized versions of the gain-adjusted photodetector signals and form a focusing error signal (FES) and a tracking error signal (TES) from the digitized versions, the digital signal processor configured with servo algorithms that process TES and FES to adjust focus and tracking in the optical disk drive; positioning the optical pick-up unit over a current zone, the current zone being one of the plurality of zones in an optical media; performing calibration algorithms to optimize a gain value for each of the amplifiers with respect to the current zone; and proceeding to a next zone, the next zone being another one of the plurality of zones, unless all of the plurality of zones have been calibrated.