Patent ID: 7151642
Filing Date: 2006-12-19
Classification: G11B,H04L

Abstract:
1. An information playback apparatus comprising: a first FIR filter which generates an equalized waveform by equalizing, to a partial response waveform, a playback data string obtained by playing back a signal recorded on an information recording medium; target waveform generating means for generating a target waveform serving as an equalization target; weighted equalization error calculation means for calculating a data string by performing convolution computation for an equalization error which is a difference between the equalized waveform and the target waveform, on the basis of one of the playback data string and the equalized waveform input from said first FIR filter and the target waveform input from said target waveform generating means; and coefficient calculation means for calculating a tap coefficient for said first FIR filter on the basis of the data string input from said weighted equalization error calculation means, and outputting the tap coefficient to said first FIR filter.