ISCA Archive Eurospeech 2003
ISCA Archive Eurospeech 2003

Introduction of the CELP structure of the GSM coder in the acoustic echo canceller for the GSM network

H. Gnaba, M. Turki-Hadj Alouane, M. Jaidane-Saidane, P. Scalart

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.