Signal equalizer.

摘要

A signal equalizer (21-25) for equalizing a waveform of a digital data sequence includes a discriminator (23) for discriminating average measuement levels at plural frequencies of the digital data sequence, an error operating unit (35) for finding the ratio or difference between an equalizing target average level which correspond to the plural frequencies that has been found in advance and an average level obtained by the discriminator and a controller (24) for controlling an equalizing characteristic of the equalizer based on the error information obtained by the error operating unit.