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Modern hands-free communication devices, such as smart speakers, are equipped with several microphones, and one or more loudspeakers. The most straightforward solution to reduce acoustic echoes is to apply acoustic echo cancellation (AEC) to each microphone. Due to limited computational resources, the implementation of such a solution may not be feasible. To overcome this problem, a method is proposed...
The performance of stereophonic acoustic echo cancelers is highly dependent on the coherence between the loudspeaker signals. If this is high, convergence is slow, during which audible residual echoes remain. Residual echoes can be reduced by applying a residual echo suppressor to the canceler's output. Yet, in order to obtain the post-filter gains, it is necessary to estimate the residual echoes...
The non-uniqueness problem of multi-channel acoustic echo cancellation can be solved by reducing the coherence between the loudspeaker signals. To this end, several coherence reduction methods have been proposed that aim at providing the best possible trade-off between signal decorrelation and degradation of the subjective audio quality. Among these, the periodically time-varying ones introduce, as...
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