Patent ID: 8116448
Filing Date: 2012-02-14
Classification: H04B,H04M

Abstract:
1. An acoustic echo canceler for canceling an echo caused by a speaker from a sound received by a microphone, the acoustic echo canceler comprising: an adaptive filter for generating an echo replica simulating the echo based on an estimated impulse response adapted to an echo path lying between the speaker and the microphone; a subtracter for subtracting the echo replica from an output signal of the microphone so as to produce an echo-canceled signal; a double-talk detector for extracting a frequency band, which has a frequency equal to or lower than a predetermined frequency, at which a reproducing ability of the speaker becomes degraded in comparison to another frequency band higher than the predetermined frequency, in which a signal level is attenuated due to the echo path, from the echo-canceled signal of the subtracter so as to detect a double-talk event based on the extracted frequency band; and a controller for controlling the adaptive filter to stop updating the estimated impulse response or to reduce a step-size for updating the estimated impulse response.