Sub-band IIR acoustic echo canceller

In teleconferencing systems the echo can be very long. A direct FIR implementation of the echo canceller often requires more than 2000 taps. One approach is to process the signal in sub-bands providing a separate FIR echo canceller for each band. We propose the use of an IIR filter in each sub-band adapted by a variant of the Steiglitz-McBride identification scheme instead of the classical adaptive FIR filters. Experimental results and computer simulations show that the proposed IIR sub-band echo canceller performs better then the equivalent FIR counterpart.

[1]  Jinhui Chao,et al.  A stable and distortion-free IIR echo and howling canceler , 1991, IEEE Trans. Signal Process..

[2]  J. Shynk.  Adaptive IIR filtering , 1989, IEEE ASSP Magazine.

[3]  Jont B. Allen,et al.  Image method for efficiently simulating small‐room acoustics , 1976 .

[4]  A. Gilloire,et al.  Experiments with sub-band acoustic echo cancellers for teleconferencing , 1987, ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[5]  W. Jenkins,et al.  A new adaptive IIR filter , 1986 .

[6]  S. Biyiksiz,et al.  Multirate digital signal processing , 1985, Proceedings of the IEEE.

[7]  W. Kenneth Jenkins,et al.  An investigation of an adaptive IIR echo canceller: advantages and problems , 1988, IEEE Trans. Acoust. Speech Signal Process..