Patent ID: 8787135
Filing Date: 2014-07-22
Classification: G11B

Abstract:
1. A signal processing device comprising: an adaptive filter for 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; a PRML circuit for 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; a calculating unit for sequentially calculating first phase errors with regard to the sampling points from a difference between the target waveform and the filtered reproduced waveform; a limiting unit for outputting second phase errors by excluding a specific phase error from the first phase errors; and a clock generating unit for 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.