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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...
The readout system of a novel ML-RLL read-only disc using signal waveform modulation is proposed. The DVD platform, sync pattern detection for timing recovery and two-stage RF detection are used in the readout system.
A new modulation coding method for signal waveform modulation multilevel disc is presented. The proposed code uses run-length and signal level to satisfy the channel constraints. The density ratio and information bits per 400 nm are 1.67 and 2.08 respectively.
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