Tracking error detection method for novel multi-level discs

摘要

Signal waveform modulation is a novel multi-level method and can achieve higher recording density than the amplitude multi-level modulation. Affected by multi-level modulation, the tracking error signal generated by the conventional differential phase detection (DPD) method deteriorates in the signal waveform modulation multi-level (SWML) disc. In the paper, a new tracking error signal detection method called the amplitude-sampling DPD (AS-DPD) method is proposed. The experimental results show that the characteristics of the tracking error signal generated by the AS-DPD method are better than that of the DPD signal in the SWML disc.