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.

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Keywords Adaptive systems and adaptive filtering, Time-frequency analysis and signal representations
Persistent URL
Journal IEEE Signal Processing Letters
Laska, B.N.M. (Brady N.M.), Goubran, R, & Bolic, M. (Miodrag). (2008). Improved proportionate subband NLMS for acoustic echo cancellation in changing environments. IEEE Signal Processing Letters, 15, 337–340. doi:10.1109/LSP.2008.919812