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Beamformer for Driving Binaural Speech Enhancement

Authors:
Heinrich W. Löllmann and Peter Vary
Book Title:
Proceedings of International Workshop on Acoustic Signal Enhancement (IWAENC)
Venue:
Aachen, Germany
Event Date:
4.-6.9.2012
Publisher:
VDE Verlag
Date:
Sept. 2012
Language:
English

Abstract

A beamformer for binaural speech enhancement systems in digital hearing aids is proposed. Its single modules for the estimation of the time-difference-of-arrival (TDOA) and time-alignment operate in the frequency-domain and have a low computational complexity. The TDOA estimation is performed efficiently by a generalized cross-correlation with phase transform weighting. The estimation accuracy for filter-banks with a limited number of subbands, which are needed for hearing aids to meet tight delay constraints, is improved by a histogram-based TDOA estimation. The subsequent time-alignment is accomplished by a simple multiplication with spectral phase factors. A primary application of the proposed system are binaural cue preserving speech enhancement systems based on spectral weighting. The proposed beamformer can be used as delay-and-sum and/or delay-and-subtract beamformer to provide subband signals from which the power spectral densities of interfering sources can be estimated to drive the spectral weight calculation.

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