Subband Speech Enhancement System for Echo and Noise Reduction with Reduced Signal Delay

Conference: Sprachkommunikation 2008 - 8. ITG-Fachtagung
10/08/2008 - 10/10/2008 at Aachen, Germany

Proceedings: Sprachkommunikation 2008

Pages: 4Language: englishTyp: PDF

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Steinert, Kai; Schönle, Martin (Siemens AG, Corporate Technology, 81739 Munich, Germany)
Beaugeant, Christophe (Infineon Technologies, Business Group Communication Solutions, 06560 Sophia-Antipolis, France)
Fingscheidt, Tim (TU Braunschweig, Institute for Communications Technology, 38106 Braunschweig, Germany)

Subband acoustic echo cancellation schemes may offer a reduced computational complexity at a faster convergence compared with time domain schemes while, however, introducing an additional delay into the signal path. This drawback can be circumvented with a delayless subband adaptive filter. Subsequent spectral weighting provides a further reduction of residual echoes and attenuation of background noise. Similar to the adaptive filter case, a low-delay approach has been proposed for postfiltering. In this paper we present a subband acoustic echo and noise reduction system which comprises both approaches mentioned and thereby keeps the signal delay low. We compare the performance of our system with that of a state-of-theart system and give an approximation of the computational complexity.