METHOD AND DEVICE FOR ADAPTING BOOSTING OF READ-OUT CHANNEL FILTER

摘要

PROBLEM TO BE SOLVED: To equalize a read-out signal from a data medium adaptationally by converting an analog output of an analog equalization filter into a digital signal being not yet processed, adjusting boosting of an analog equalization filter conforming to errors in this signal. SOLUTION: A viterbi detector 304 decides the maximum likelihood data group encoded by a write-in channel of an EPR 4 system based on a read-out signal. A digital output being not yet processed of ADC is compared with an encoding signal recovered by the viterbi detector by an adaptation processor 306. The adaptation processor 306 obtains a boosting adjustment signal based on a characteristic of errors in a system being not yet processed decided by the viterbi detector. The boosting adjustment signal is inputted to a boost 300 of an analog equalization filter, and this boost is adjusted until the system is made the most effective using negative feedback in order to make an error decided by the viterbi detector the minimum.