Multi-Channel Speech Enhancement Using a Psychoacoustic Approach For a Post-Filter

Authors: V. Mildner, S. Goetze, K.-D. Kammeyer
Abstract: Multi-channel systems containing a Delay&Sum-Beamformer have been previously combined with post-filters to achieve higher speech enhancement in noisy conditions. Problems occurring in the lower frequency regions were compensated by applying a Wiener weighting rule or spectral subtraction. We extend this by referring to the log-STSA rule of Ephraim-Malah. Furthermore, we introduce a psychoacustically motivated postfilter based on the one presented by Gustafsson for single-channel systems. Relying on Li's subband approach we derive an algorithm which exploits the advantage of multi-channel systems in order to estimate those quantities necessary for computing the psychoacoustic weighting rule.
Document type: Conference Paper
Publication: Kiel, Germany, 26. - 28. April 2006
Conference: ITG-Fachtagung Sprachkommunikation 2006
Index: 268
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Last change on 30.04.2008 by S. Goetze
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