Multi-level information reproducing method, multi-level information recording medium, multi-level information waveform equalizing device, multi-level information reproducing apparatus, multi-level information recording apparatus, signal processing method, reproduced signal processing circuit and optical disk apparatus

摘要

A multi-level information reproducing method for reproducing from a recording medium on which marks having detection signal levels different according to multi-level information are recorded in areas virtually divided uniformly, comprising the steps of: a) obtaining a reproduced signal from a series of patterns of multi-level information indicating an average level of intersymbol interference components to adjacent areas generated from marks according to all the multi-level information; and b) optimizing frequency characteristics of a reproducing part with respect to the reproduced signal.