A Comparison of the Convolutive Model and Real Recording for Using in Acoustic Echo Cancellation

摘要

The paper investigates the convolutive model, which models the interaction between a loudspeaker and a microphone. First, the impulse response of the channel from the loudspeaker to the microphone is experimentally measured. Then, a speech signal is played on the loudspeaker and the corresponding microphone response is recorded. This signal is compared with that obtained by convolution between the speech signal and the impulse response which was previously measured. To give a more weight to this comparison, an acoustic echo cancellation (AEC) is implemented, where the echo signal is either computed (using the convolutive model) or recorded. It follows a degradation of the quality of the AEC when the echo is recorded. Some methods to improve the result are proposed.