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A new efficient implementation of the AIFIR echo tail canceller for ISDN applications

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3 Author(s)
Laichi, F. ; Dept. of Electr. Eng., Ottawa Univ., Ont., Canada ; Aboulnasr, T. ; Steenaart, W.

An efficient echo tail canceller is proposed for use with the 2B1Q receiver for ISDN (integrated services digital network) applications. The overall echo cancellor is composed of a direct form FIR (finite impulse response) main canceller to cancel the main part of the echo followed by an adaptive interpolative FIR section (AIFIR) for tail cancellation. The AIFIR is a cascade of an adaptive sparse filter and a fixed interpolator filter. Preliminary results show that, by implementing the interpolator as a cascade of combinations of comb filters, one can achieve echo attenuation close to that obtainable by min-max interpolators while reducing the number of multipliers required

Published in:

Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on

Date of Conference:

14-17 Apr 1991

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