Beamforming microphone arrays for speech acquisition in noisy environments

Author(s): Simmer, K. U.

Journal/Book: Speech Commun. 1996; 20: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science BV. 215-227.

Abstract: In this paper we present an adaptive microphone array with adaptive constraint values to suppress coherent as well as incoherent noise in disturbed speech signals. We use a generalized sidelobe cancelling (GSC) structure implemented in the frequency domain since it allows a separate handling of determining the adaptive look-direction response to suppress incoherent noise and adjusting the adaptive filters for cancellation of coherent noise, The transfer function in the look-direction is an adaptive Wiener-Filter which is estimated by using the short-time Fourier transform and the Nuttall/Carter method for spectrum estimation. The experimental results demonstrate that the proposed method works well for a large range of reverberation times and is therefore able to operate independently of the correlation properties of the noise field.

Note: Article Fischer S, Univ Bremen, Dept Phys & Elect Engn, POB 330 440, D-28334 Bremen, GERMANY

Keyword(s): microphone-arrays; audio-beamforming; noise reduction; speech processing; HEARING-AIDS; IMPLEMENTATION; SUPPRESSION; ALGORITHM; REDUCTION; SYSTEMS

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