Title: Suppression of remnant nonlinear echo due to harmonic distortions in intelligent communication networks

Authors: Asutosh Kar; Mahesh Chandra

Addresses: Department of Electronics and Tele-communication Engineering, IIIT, Bhubaneswar, PIN-751003, Odisha, India ' Department of Electronics and Communication Engineering, BIT Mesra, Ranchi, India

Abstract: Voice communication today has become an important and an integral part of human kind in which speech quality is an important concern. The issue of speech degradation due to end user devices can be tackled when efficient devices and algorithms are used to cancel acoustic echo. Acoustic echo canceller (AEC) is used to eliminate unwanted echo which dampens speech signal and reduces the efficiency of signal transmission. With advent of sophisticated technology low cost loudspeakers and power amplifiers are devised which bring nonlinearity into communication channel. In this paper, an improved solution for the cancellation of the nonlinear echo to restore the speech quality in a communication channel is designed. The conceived algorithm deals with nonlinear AEC with moderately low computational complexity and faster convergence. The whole process starts with linear AEC and then the proposed harmonic distortion nonlinear remnant echo suppressor comes into action after passing through linear AEC.

Keywords: harmonic distortion; acoustic echo cancellation; nonlinear AEC; adaptive filters; nonlinear control; NLC; least mean squares; mean square error; MSE; intelligent communications networks; voice communication; speech quality; speech degradation.

DOI: 10.1504/IJICT.2016.078881

International Journal of Information and Communication Technology, 2016 Vol.9 No.2, pp.212 - 231

Received: 29 Jul 2014
Accepted: 02 Sep 2014

Published online: 24 Aug 2016 *

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