Performance analysis of an efficient AIFIR echo-tail canceller

Author

Abousaada, Anis ; Aboulnasr, Tyseer ; Steenaart, Willem

Author_Institution

Dept. of Electr. Eng., Ottawa Univ., Ont., Canada

fYear

1990

fDate

12-14 Aug 1990

Firstpage

552

Abstract

A computationally efficient two-stage echo canceller is proposed. The first stage is a direct form adaptive FIR filter to cancel the main part of the echo response. The second stage cancels the `tail´ part of the echo response. The proposed tail canceller is an adaptive version of the interpolated FIR (IFIR) filter. It is shown that the two-stage canceller meets the 60 dB echo cancellation accuracy for various Bellcore loops. Extensive simulations were carried out to study the effects of the main canceller length as well as the interpolator parameters on the performance of the two-stage echo canceller in the U-interface transceiver for basic rate ISDN. It is shown that the proposed structure compares very favorably with other proposed two stage cancellers

Keywords

ISDN; adaptive filters; digital filters; echo suppression; transceivers; AIFIR echo-tail canceller; Bellcore loops; U-interface transceiver; adaptive FIR filter; basic rate ISDN; echo cancellation accuracy; echo response; interpolated FIR; two-stage echo canceller; Adaptive filters; Band pass filters; Echo cancellers; Finite impulse response filter; IIR filters; ISDN; Interpolation; Performance analysis; Tail; Transversal filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1990., Proceedings of the 33rd Midwest Symposium on

Conference_Location

Calgary, Alta.

Print_ISBN

0-7803-0081-5

Type

conf

DOI

10.1109/MWSCAS.1990.140778

Filename

140778