Adaptive equalizing circuit

摘要

High-order partial response equalization is performed so that the equalization error of an input signal having non-linear distortions is minimized, thereby improving the characteristics of a reproduced signal. An input signal is subjected to high-order partial response equalization adapted to a non-linear distortion waveform by using a transversal filter 3; a provisional equalization target value is estimated by a provisional decision circuit 4; an error between the provisionally decided value and the input signal is detected by an error detection circuit 5; an error between the provisionally decided value and the output signal from an A/D converter 1 is detected by an input distortion detection circuit 7; the error outputted from the error detection circuit 5 is monitored by an output distortion detection circuit 6; the equalization target value is controlled by an equalization target control means 8 so that the equalization error is minimized; and tap coefficients are controlled by a tap coefficient control means 10.