Multisensorsysteme zur Geräuschunterdrückung

Two drawbacks have to be envisaged if noise suppression with one-channel methods or if noise compensation using a reference channel for the noise is applied: on one hand a speech pause detector is a prerequisite to estimate the noise in speech pauses, on the other hand only point-sources for the noise can be compensated. The system presented in the paper users a mircophone array to overcome these problems. The speech signal is enhanced realizing a specific charateristic of the array and setting a zero in the direction of the speaker to estimate the noise. Combining this approach with well-known techniques for speech enhancement deliver a high gain for the signal-to noise ratio. The system can be used for speech enhancement for hand-set free communication from cars and for speech control of machinery.