Patent ID: 8184515
Filing Date: 2012-05-22
Classification: G11B

Abstract:
1. A waveform shaping device, comprising: a finite impulse response filter that receives a digital reproduced signal generated from an analog reproduced signal reproduced from an information recording medium and shapes a waveform of the digital reproduced signal; an amplitude level detection portion that detects an N′th amplitude level from a predetermined reference level in an output of the finite impulse response filter; an amplitude error detection portion that detects a difference between the amplitude level detected by the amplitude level detection portion and a predetermined target amplitude; and a coefficient calculation portion that calculates coefficients of the finite impulse response filter on the basis of an output of the amplitude error detection portion, wherein the coefficient calculation portion calculates the coefficients of the finite impulse response filter so that the output of the amplitude error detection portion reaches the predetermined target amplitude and updates the coefficients of the finite impulse response filter to the coefficients that have been calculated; wherein the amplitude level detection portion includes: wherein the amplitude error detection portion includes: wherein the coefficient calculation portion calculates the coefficients of the finite impulse response filter on the basis of outputs of the first amplitude error detection portion and the second amplitude error detection portion.