PURPOSE: To obtain an equalized output without interference by forming approximately an interference signal component and subtracting it from an input signal.

CONSTITUTION: A received signal at a terminal 1 is formed into an equalized output signal without interference by subtracting a signal formed approximately from an interference signal waveform outputted from an adder circuit 8 at a subtraction circuit 3, correct data identification/discrimination is conducted at the identification circuit 4 of the next stage and the result is outputted from a terminal 5 as a reception data signal pulse. Further weights w1∼wM are multiplied respectively at each multiplier circuit 7 to a passing signal from each stage through one stage of a delay circuit 6 having a delay time of data identification period T and the (M-1)th stage of a delay circuit 9 having a delay time of T/2 to the pulse from the circuit 4 and signals passing respectively through a sampling function signal forming circuit 10 are added by a circuit 8 to obtain a signal forming approximately the interference signal waveform.