| 摘要 |
PROBLEM TO BE SOLVED: To accurately cancel an echo signal from a sound collecting signal obtained by mixing acoustic signals to be reproduced from two speakers and to be collected into a single microphone. SOLUTION: Values are output, as power deviation values, which is different depending on relation between the power of a reproduction sum signal of two channels and the power of a reproduction difference signal, the simulated characteristic of a first adaptive type simulated echo path based on a fifth estimation value obtained by differentiating a proportion of weighted average between a first estimation value and a third estimation value is updated depending on the power deviation, and the simulated characteristic of a second adaptive type simulated echo path based on a sixth estimation value obtained by differentiating a proportion of weighted average between a second estimation value and a fourth estimation value is updated. COPYRIGHT: (C)2007,JPO&INPIT
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