Multi-microphone residual echo estimation

Summary form only given. Post-filters are a powerful extension to improve echo attenuation when combined with the well-known echo canceller. In order to guarantee high quality of transmitted speech signals, the primary purpose of a post-filtering system is to estimate, as accurately as possible, the power spectral density (PSD) of the residual echo at the output of the echo canceller. We introduce a novel technique to estimate the residual echo by using a microphone array. Robustness against double-talk and other additive interference is reached by means of minimum statistics and further enhanced by exploiting spatial information. Simulation results show that the new methods are able to estimate the residual echo even under adverse conditions.