Beamforming for Moving Source Speech Enhancement

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Zohra Yermeche, Nedelko Grbic, Ingvar Claesson
Title: Beamforming for Moving Source Speech Enhancement
Conference name: WASPAA
Year: 2005
Pagination: 25-28
ISBN: 10.1109/ASPAA.2005.1540159
Publisher: IEEE
City: New Paltz, USA
ISI number: 000236204100007
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (*** Error ***)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Authors e-mail: zye@bth.se, ngr@bth.se, icl@bth.se
Language: English
Abstract: This paper presents a new constrained subband beamforming algorithm to enhance speech signals generated by a
moving source in a noisy environment. The beamformer is based on the principle of a soft constraint defined for
a specified region corresponding to a known source location. The soft constraint secures the spatial-temporal
passage of the desired source signal in the adaptive update of the beamforming weights and guarantees the full rank property of the matrix inverted in the update. The source of interest is modelled as a cluster of stationary point sources and source motion is accommodated by revising the point source cluster. The source
modelling and its direct exploitation in the beamformer through covariance estimates are presented. An algorithm
for sound source localization is used for speaker movement tracking and this information is exploited to update
the spatial distribution in the source model. Evaluation in a real environment with a moving speaker shows a significant noise and hands-free interference suppression within the conventional telephone bandwidth. This is achieved with a negligible impact on speech distortion.
Subject: Signal Processing\Beamforming
Signal Processing\Speech Enhancement
Keywords: Speech enhancement, beamforming, time-delay estimation
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