Abstract
Multi-channel speech enhancement systems are used for hands-free speech communication in order to achieve a sufficiently high attenuation of the disturbing background noise signals which are acquired together with the speech signal. In order to optimize multi-channel speech enhancement, the dependence between signal statistics, signal attenuation, and the distance of the microphones inside the used microphone array is derived. Is is shown that for each microphone distance a frequency range is given in which the multi-channel speech enhancement achieves a high attenuation of the noise signal while causing only few distortions of the speech signal.
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