To accurately remove noise from input voice.
A removing part removes the component of a second voice from a first signal obtained from a first input part to which first voice is mainly input, by using a filter coefficient which is updated according to a second signal obtained from a second input part to which second voice is mainly input. A mixing detection part detects that the first voice component is mixed in the second signal, when it is determined that a correlation value for indicating correlation between the first signal and the second signal exceeds a predetermined threshold, and that the difference of an output level of the first signal from that of the second signal exceeds a predetermined threshold. A control part controls to stop updating of the filter coefficient, when it is detected that the first voice component is included in the second signal, by the mixing detection part.
COPYRIGHT: (C)2011,JPO&INPIT
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