Patent ID: 7925008
Filing Date: 2011-04-12
Classification: H04M,H04R

Abstract:
1. A multi-channel echo cancel method associated to a space provided therein with a plurality of loudspeakers and at least one microphone for forming a plurality of audio transfer systems, the method comprising: inputting multi-channel audio signals from an outside, which have a correlation with each other, and which are reproduced by said respective loudspeakers and collected by said at least one microphone through the audio transfer systems; estimating transfer functions of said plurality of said audio transfer systems so as to set corresponding filter characteristics, respectively; producing echo cancel signals respectively by applying said filter characteristics to corresponding multi-channel audio signals to be reproduced by said respective loudspeakers; and subtracting said echo cancel signals from corresponding collected audio signals of said at least one microphone, thereby performing echo cancellation, wherein a principal component analysis is applied to said multi-channel audio signals to produce a plurality of uncorrelated composite signals that are orthogonal to each other, and the transfer functions of the respective audio transfer systems are respectively derived using a set of said plurality of said uncorrelated composite signals as reference signals, thereby to set the corresponding filter characteristics.