A METHOD FOR IMPROVING THE PLAYABILITY OF NON-IDEAL OPTICAL CARRIERS

摘要

The present invention relates to a method for improving the playability of non- ideal optical disks. Initially, an asymmetry (Asl) of the optical carrier is determined. If the asymmetry is above a pre-defined first threshold then a step of decreasing an upper cut-off frequency (HPF) to a first cut-off frequency (HPFl) of a high pass filtering performed on a data channel (HF) in response to the asymmetry (Asl) is undertaken. Subsequently, a step of optimizing an amplification level of a radial error signal (RE) and/or a focus error signal (FE) of a servomechanism controlling the optical carrier is undertaken. Finally, a last step of determining a second indication of asymmetry (As2) of the data channel (HF) from the optical carrier is performed. The invention is advantageous because a better indication of the asymmetry is provided because the asymmetry is assessed two consecutive times interrupted by a high pass filter adjustment. FIG 3