Small Microphone Arrays with Postfilters for Noise and Acoustic Echo Reduction

摘要: This chapter presents arrays with two microphones and a postfilter for noise reduction acoustic echo cancellation. The algorithm exploits the spatial coherence of microphone signals. In contrast to single-microphone enhancement algorithms, it does not need an explicit power spectral density estimate. An analysis mean square error reveals that properties signals are paramount importance performance postfilter. Coherence measurements in various environments presented. influence directivity orientation on measured is discussed rules design interface given. Finally, applications this approach two-microphone employed reduce non-stationary voice intercom computed tomography scanner. It also combined cancellers be used robust desktop conferencing device.