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Multisensorsysteme zur Geräuschunterdrückung

: Gierl, S.; Kroschel, K.

TU Ilmenau:
35. Internationales Wissenschaftliches Kolloquium '90. Vortragsreihe A 4.5. Methoden und Anwendungen der Signalerkennung/Signalanalyse
Ilmenau, 1990
pp.211-214 : Abb.,Tab.,Lit.
Internationales Wissenschaftliches Kolloquium <35, 1990, Ilmenau>
Conference Paper
Fraunhofer IITB ( IOSB) ()
Geräuschkompensation; Geräuschreduktion; microphone arrays; Mikrofon-Arrays; noise compensation; noise reduction; speech communication; speech pause detection; Sprachkommunikation; Sprachpausendetektion

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.