A Robust Echo Compensator: Implementation And Realtime Measurements

Abstract

In this paper, the implementation of a compensator for acoustical echoes is presented. The algorithm consists of an adaptive transversal filter, which is adjusted according to a modified version [l] of the wellknown normalized :LMS (NLMS) procedure. Decorrelation filters Rere added to improve the convergence. Beyond that, the stepsize was varied according to the noise level in order to achieve best performance in noisy environments. The paper concludes with some results of realtime measurements of the behavior in typical operating conditions. such as hands-free telephone equipment, demonstrating the performance of the system.