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Open Access

An Improved Array Steering Vector Estimation Method and Its Application in Speech Enhancement

EURASIP Journal on Advances in Signal Processing20052005:534013

https://doi.org/10.1155/ASP.2005.2930

Received: 30 April 2004

Published: 10 November 2005

Abstract

We propose a robust microphone array for speech enhancement and noise suppression. To overcome target signal cancellation problem of conventional beamformes caused by array imperfections or reverberation effects, the proposed method adopts arbitrary transfer function relating each microphone and target speech signal as array channel model. This is achieved in two ways. First, we propose a method to estimate the array steering vector (ASV) by means of exploiting the nonstationarity of speech signal to combat stationary noise and interference. Next, with the estimated ASV, a robust matched-filter-(MF-) array-based generalized sidelobe canceller (MF-GSC) is constructed to enhance the speech signal and suppress noise/interference. In addition, it also has the capability to reduce the reverberation effects of the acoustic enclosure. Numerical results show that the proposed method demonstrates high performance even in adverse environments.

Keywords and phrases

adaptive microphone arraymatched-filter arraygeneralized sidelobe cancellernoise suppressionspeech enhancementnonstationarity

Authors’ Affiliations

(1)
Center for Signal Processing, Nanyang Technological University, Singapore, Singapore
(2)
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

Copyright

© Yu and Er 2005

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