METHOD FOR GENERATING A CORRECTED ERROR SIGNAL, AND CORRESPONDING APPARATUS

摘要

In order to obtain a corrected or compensated focus error signal (DFEN) or track error signal (DPPN), it is proposed to generate primary and secondary scanning beams incident on adjacent tracks of an optical recording medium (7) and to detect the primary and secondary scanning beams reflected from the optical recording medium in order to derive from them primary-beam and secondary-beam focus error signals (CFE, OFE) or primary-beam and secondary-beam track error signals (CPP, OPP), which are subsequently normalized in order to obtain the compensated focus error signal (DFEN) or track error signal (DPPN) from the normalized primary-beam and secondary-beam error signals (CFEN, OFEN; CPPN, OPPN) by means of weighted combinations. As a result of the normalization, the corrected or compensated focus error signal (DFEN) or track error signal (DPPN) is generated independently of the reflection properties of the respectively scanned track.