Blind Subband Beamforming for Speech Enhancement of Multiple Speakers

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Zohra Yermeche, Nedelko Grbic, Ingvar Claesson
Title: Blind Subband Beamforming for Speech Enhancement of Multiple Speakers
Conference name: APCAAS
Year: 2006
Pagination: 828 - 831
ISBN: 10.1109/APCCAS.2006.342149
Publisher: IEEE
City: Singapore
ISI number: 000246793200207
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
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: A new blind microphone array method to enhance speech signals generated by multiple sources in a noisy environment is proposed. This approach is based on a two-stage scheme. A subband time-delay estimation algorithm is first used to localize the dominant speech sources. The speech enhancement is performed in a second stage, based on the acquired spatial information, by means of a spatially constrained subband beamformer. The robustness of this structure is ensured by the spatial constraint constructed to include the discrepancies in the acoustical environment model as well as errors in the time-delay estimation. Such scheme also allows for an efficient adaptation of the beamformer to speakers movement. The proposed subband approach for time-delay estimation exploits the sparseness of speech signals in the time-frequency domain to localize multiple speakers simultaneously. It also provides means to select the number of target sources. Evaluation in a real environment shows promising results.
Subject: Signal Processing\Beamforming
Signal Processing\Speech Enhancement
Keywords: Speech enhancement, beamforming, time-delay estimation, Kurtosis maximization
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