Patent ID: 7145848
Filing Date: 2006-12-05
Classification: G11B

Abstract:
1. An optical disk apparatus for recording and reproducing information to and from an optical disk, the optical disk apparatus comprising: an optical pickup for irradiating a light beam onto an optical disk surface for recording and reproducing the information to generate an analog reproduction signal therefrom; an A/D converter for converting the analog reproduction signal into a digital reproduction signal an adaptive equalizer for receiving the digital reproduction signal from the A/D converter and adaptively renewing a plurality of tap coefficients of a FIR filter; and an aberration control apparatus for minimizing an aberration contained in a spot of a light beam irradiated from the optical pickup onto the optical disk, wherein the aberration control apparatus comprises: wherein the aberration detector is operable to detect the aberration by comparing at least one pair of the tap coefficients that are symmetrical with respect to a center position in time delay order thereof, and wherein a number of the plurality of the tap coefficients is odd, and the correction control unit is operable to control the aberration correction of the aberration correcting unit in a manner that at least a symmetrical pair of the tap coefficients are made substantially coincident with each other.