Signal processing device, signal processing method, and optical disc apparatus

A method of processing a signal comprising the steps of:

• filtering adaptively a reproduced waveform of a reproduced signal from a recording medium so as to make the reproduced waveform be closer to a target waveform;
• sequentially generating binarized data from the filtered reproduced waveform using a PRML scheme by sampling at sampling points in a period based on a clock signal and sequentially generating a partial response waveform which is to be the target waveform from the binarized data;
• sequentially calculating first phase errors with regard to the sampling points from a difference between the target waveform and the filtered reproduced waveform;
• outputting second phase errors by excluding a specific phase error from the first phase errors;
• and
• generating the clock signal of a frequency corresponding to the second phase errors;
• wherein the specific phase error includes a phase error at a time when the partial response waveform reaches a specific level which excludes at least a level not less than a predetermined amplitude level.

A method of processing a signal comprising the steps of:

• filtering adaptively a reproduced waveform of a reproduced signal from a recording medium so as to make the reproduced waveform be closer to a target waveform;
• sequentially generating binarized data from the filtered reproduced waveform using a PRML scheme by sampling at sampling points in a period based on a clock signal, and sequentially generating a partial response waveform from the binarized data;
• generating the target waveform by equalizing the partial response waveform;
• sequentially calculating a phase error with regard to the sampling point from a difference between the partial response waveform and the filtered reproduced waveform;
• and
• generating the clock signal of a frequency corresponding to the phase error.