DocumentCode :
3849424
Title :
Residual echo signal in critically sampled subband acoustic echo cancellers based on IIR and FIR filter banks
Author :
O. Tanrikulu;B. Baykal;A.G. Constantinides;J.A. Chambers
Author_Institution :
Dept. of Electr. & Electron. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK
Volume :
45
Issue :
4
fYear :
1997
Firstpage :
901
Lastpage :
912
Abstract :
The residual echo signal characteristics of critically sampled subband acoustic echo cancellers are analyzed. For finite impulse response (FIR) filter banks, the residual echo signal usually has a relatively broad spectral nature around the subband edges. The residual echo signal of power symmetric infinite impulse response (PS-IIR) filter banks, on the other hand, has very narrowband spectral components around the subband edges. These components can be efficiently removed with PS-IIR notch filters that integrate neatly into the filter banks without introducing perceptually noticeable degradation to the near-end speech. This solution has very low computational complexity and does not impinge on the system performance. Simulation studies with recordings from the cockpit of a car, based on a fast QR least-squares adaptive algorithm, demonstrate the potential of this approach for a practical AEC system.
Keywords :
"Filter bank","Finite impulse response filter","IIR filters","Echo cancellers","Signal analysis","Narrowband","Degradation","Speech","Computational complexity","System performance"
Journal_Title :
IEEE Transactions on Signal Processing
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/78.564178
Filename :
564178
Link To Document :
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