Spectral-subtraction speech enhancement in multirate systems with and without non-uniform and adaptive bandwidths

Authors:
T. Gülzow;T. Ludwig;U. Heute
Affiliations:
Robert Bosch GmbH, K7/EFS31, Mobile Communication Division Daimlerst. 6, D-71229, Leonberg and Institute for Circuits and Systems Theory, Faculty of Engineering, Christian-Albrechts University of ...;Institute for Circuits and Systems Theory, Faculty of Engineering, Christian-Albrechts University of Kiel, Kaiserstrasse 2, D-24143 Kiel, Germany;Institute for Circuits and Systems Theory, Faculty of Engineering, Christian-Albrechts University of Kiel, Kaiserstrasse 2, D-24143 Kiel, Germany
Venue:
Signal Processing - Special section: Hans Wilhelm Schüßler celebrates his 75th birthday
Year:
2003

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Abstract

The method of spectral subtraction is widely used for single-channel speech enhancement, if the speech signal is corrupted by additive noise. It is based on the manipulation of the magnitude of the noisy-speech spectrum. Most realizations use fixed, uniformly-spaced frequency transformations or, equivalently, filter banks with identical sampling rates in each frequency band. In this paper, we generalize the basic structure: Different filter-bank systems with non-uniform and, especially, non-constant, signal-adaptive spectral resolutions and, therefore, different sampling rates are examined. An efficient realization of a time-varying band allocation is proposed. The arising problems are discussed and the enhancement results are compared to each other and to those obtained with uniform spectral transformations.