An assessment of linear adaptive filter performance with nonlinear distortions

Acoustic echo cancellers are generally based on the assumption of a linear echo path between the transducers. However the small loudspeakers that are commonly used in todays terminals can introduce nonlinear distortions that reduce the performance of echo cancellation. In order to evaluate the degradation in performance, this paper assesses the behaviour of five linear echo cancellers in the presence of nonlinearities and presents the first thorough comparison of their robustness. Even if the performance of all the echo cancellers degrades as expected, some algorithms are shown to be more robust than others: fast converging algorithms and block signal processing are more perturbed in nonlinear environments.

[1]  Dayong Zhou,et al.  Efficient Adaptive Nonlinear ECHO Cancellation, Using Sub-band Implementation of the Adaptive Volterra Filter , 2006, 2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings.

[2]  Xiaoli Ma,et al.  A residual echo suppression technique for systems with nonlinear acoustic echo paths , 2008, 2008 IEEE International Conference on Acoustics, Speech and Signal Processing.

[3]  Régine Le Bouquin-Jeannès,et al.  Nonlinear acoustic echo cancellation based on Volterra filters , 2003, IEEE Trans. Speech Audio Process..

[4]  Walter Kellermann,et al.  Nonlinear acoustic echo cancellation using adaptive orthogonalized power filters , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[5]  Akihiko Sugiyama,et al.  An Acoustic ECHO Suppressor Based on a Frequency-Domain Model of Highly Nonlinear Residual ECHO , 2006, 2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings.

[6]  Rudolf Rabenstein,et al.  Nonlinear acoustic echo cancellation with 2nd order adaptive Volterra filters , 1999, 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258).

[7]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[8]  Walter A. Frank.  An efficient approximation to the quadratic Volterra filter and its application in real-time loudspeaker linearization , 1995, Signal Process..

[9]  Rafik Goubran,et al.  Limitations of handsfree acoustic echo cancellers due to nonlinear loudspeaker distortion and enclosure vibration effects , 1995, Proceedings of 1995 Workshop on Applications of Signal Processing to Audio and Accoustics.

[10]  Riitta Niemistnd,et al.  ON PERFORMANCE OF LINEAR ADAPTIVE FILTERING ALGORITHMS IN ACOUSTIC ECHO CONTROL IN PRESENCE OF DISTORTING LOUDSPEAKERS , 2003 .