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Improved Proportionate Subband NLMS for Acoustic Echo Cancellation in Changing Environments

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3 Author(s)
Brady N. M. Laska ; Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, ON ; Rafik A. Goubran ; Miodrag Bolic

Acoustic echo paths can change frequently in response to minor changes in the near-end room. Using echo path measurements obtained using commercial wideband hands-free terminals, it is demonstrated that the effects of these changes are not uniform across time and frequency. A subband echo canceler combined with a proportionate step-size adaptation algorithm is proposed to exploit time and frequency response characteristics of echo path changes to achieve faster tracking and higher echo attenuation. Improvements of 5-10 dB compared to fullband structures are observed for real changing echo environments with wideband speech inputs.

Published in:

IEEE Signal Processing Letters  (Volume:15 )