ECHO CANCELLATION DEVICE, ECHO CANCELLATION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an echo cancellation device capable of implementing accurate signal processing.SOLUTION: The echo cancellation device includes: a synthetic signal frequency characteristic generation section for generating a synthetic signal frequency conversion coefficient from an estimate of a discrete frequency conversion coefficient of an impulse response and a discrete frequency conversion coefficient of an array of reference signals; an odd-number component imaginary part extraction section for extracting a predetermined array as an odd-number component imaginary number array in such a manner that an imaginary number part of a result of performing inverse discrete frequency conversion on an odd-numbered array of synthetic signal frequency conversion coefficient becomes equal to a result of performing inverse discrete frequency conversion on the predetermined array; an even-number component window correction section for acquiring an even-number component window correction array by executing processing of a frequency domain equivalent with the case where a sine window is applied to an even-numbered array of the synthetic signal frequency conversion coefficient in a time domain; and an addition section for adding the odd-number component imaginary number array and the even-number component window correction array.