To enable remarkably shortening an inevitably occurring processing delay in an algorithm while avoiding the deterioration in echo component ratio estimating performance in an echo cancellation method.
The ratio of echo components included in a short-time spectrum of a residual signal is estimated by using not only the short-time spectrum of a multi-channel reproduction signal of a present frame but also the short-time spectrum of a reproduction signal of a past frame. More specifically, the present frame and past frame of the multi-channel reproduction signal are separated into a main component consisting of the short-time spectrum of a first channel reproduction signal of the present frame, and a sub-frame consisting of the short-time spectrum of the other reproduction signal from which the correlation with the main component is removed, the ratio of the echo of the main component occupied in the residual signal is obtained, the ratio of the echo of the sub-component is obtained in the voice picked-up signal from which the correlation with the main component is removed, and the ratio of echo components of the multichannel reproduction signal occupied in the residual voice signal is obtained, and the ratio of echo component of the multi-channel reproduction signal occupied in a picked-up voice signal is estimated from these two ratios.
COPYRIGHT: (C)2006,JPO&NCIPI
Suehiro Shimauchi
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