Patent ID: 6870880

Claim:
A waveform equalization apparatus comprising: a first input terminal to which only a real component of a digital input signal to be waveform-equalized is applied; a second input terminal to which only an imaginary component of the digital input signal to be waveform-equalized is applied; plural transversal filters for performing filtering processes for waveform equalization on the digital input signal; a first output terminal from which only a real component of a waveform-equalized digital output signal is outputted; a second output terminal from which only an imaginary component of the waveform-equalized digital output signal is outputted; plural selectors for selecting a connection of lines which interconnect the first or second input terminal, the plural transversal filters, and the first or second output terminal; and a filter construction control signal generator for generating a filter construction control signal which controls the plural selectors to control the filter construction such that the whole apparatus becomes a real component filter when the digital input signal is a signal having only a real component, and becomes a complex filter when the digital input signal is a signal having both a real component and an imaginary component.