Nouveau dispositif d’annulation d’écho utilisant un filtre interpolateur

This paper presents a new over-sampling echocanceller structure in which a simple structured interpolator is introduced and replaces half the number of echo-cancellers used in a classical structure. If dis-symmetrical equipments are authorized at the extremities of the transmission system (different carrier frequencies), the cascade of an echo-canceller and an interpolator reaches much better performances than those of a classical system. This is due to the interpolator which reduces the noise of the gradient algorithm governing the echo-cancellers evolution. Using such an interpolator decreases the computational complexity in very attractive proportions (up to 44%). Computer simulations confirm theoretical developments and let appreciate the good robustness of the depicted system.