Multi-channel echo cancellation method, multi-channel echo canceller, multi-channel echo cancellation program and the recording medium

摘要

PROBLEM TO BE SOLVED: To solve the problem that echo can not be sufficiently canceled at all the time with the prior multi-channel echo cancellation arts and if residual echo becomes great, a speech quality may be deteriorated.;SOLUTION: A multi-channel echo cancellation technology includes: determining a power spectrum of each channel of an M-channel reception signal, a cross spectrum between channels of the M-channel reception signal and a cross spectrum between the M-channel reception signal and a voice collection signal or the like; using the power spectrum and the cross spectrums to estimate an input/output transfer property for each frequency; predicting an echo component included in the voice collection signal or the like from the M-channel reception signal of a frequency domain and the estimated input/output transfer property; subtracting the predicted echo component from the voice collection signal or the like of the frequency domain to determine a transmission signal, and transforming the transmission signal determined in the subtraction step into a signal of a time domain.;COPYRIGHT: (C)2011,JPO&INPIT