OPTICAL RECORDING MEDIUM, METHOD OF MAKING OPTICAL RECORDING MEDIUM, METHOD OF PROCESSING PLAYBACK SIGNAL AND EVALUATION METHOD

摘要

FIELD: information technology. ^ SUBSTANCE: device 21 for detecting BCA and the discrimination circuit 22 of the medium collect waveform distortion information to determine waveform distortion of the playback signal played back by the optical head 12. A waveform variable leveller 16 changes the parameter used to carry out the distortion reduction process in order to reduce waveform distortion of the playback signal based on waveform distortion information. ^ EFFECT: high quality of playing back high-frequency signal. ^ 19 cl, 14 dwg