Data reproduction apparatus and method with improved performance by adjusting filter coefficients of equalizer

摘要

A data reproduction apparatus and method capable of improving data reproduction performance by adjusting the filter coefficients of an equalizer (106) including a digital filter, and connected before a Viterbi detector (114). A level of the output value of the equalizer (106) is detected based on a reference level set in the Viterbi detector (114), and a level error of the detected level with respect to a predetermined reference value is detected. The filter coefficients of the equalizer (106) are adjusted such that the level error is minimized, thereby improving the detection performance of the Viterbi detector (114).