8th European Conference on Speech Communication and Technology

Geneva, Switzerland
September 1-4, 2003


Introduction of the CELP Structure of the GSM Coder in the Acoustic Echo Canceller for the GSM Network

H. Gnaba (1), M. Turki-Hadj Alouane (1), M. Jaidane-Saidane (1), P. Scalart (2)

(1) Ecole Nationale d'Ingenieurs de Tunis, Tunisia
(2) France Telecom R&D, France

This paper presents a new structure of an Acoustic Echo Canceller (AEC) designed to operate in the Mobile Switching Center (MSC) of a GSM network. The purpose of such system is to cancel the echo for all the subscribers. Contrarily to the conventional AEC, the proposed combined AEC/CELP Predictor is able to take into account the non linearities introduced by the GSM speech coders/decoders. A short term predictor is used to model the behavior of the codecs. This new combined system presents higher performance compared to the conventional AEC.

Full Paper

Bibliographic reference.  Gnaba, H. / Alouane, M. Turki-Hadj / Jaidane-Saidane, M. / Scalart, P. (2003): "Introduction of the CELP structure of the GSM coder in the acoustic echo canceller for the GSM network", In EUROSPEECH-2003, 1389-1392.