Review Paper on Linear and Nonlinear Acoustic Echo Cancellation

Abstract

Abstract. In this paper a review on acoustic echo cancellation (AEC) systems based on linear AEC and nonlinear AEC are presented. The paper covers advancements in the previous research works related to the acoustic echo cancellation process. Here review is done based on adaptive algorithms used. Since in linear AEC systems, the non-linearity caused by loudspeakers, amplifier and low-quality enclosures are not taken into considerations. The implementation of linear AEC is based on the assumption of linearity. The performance of echo cancellation algorithms are degraded due to non-linearities in the acoustic path. Therefore non-linear AEC systems are evaluated and reviewed along with linear AEC.

Performance Comparison of Different Affine Projection Algorithms for Noise Minimization from Speech Signals

“…An affine projection algorithm (APA) and its variants have been proposed in recent years [7][8][9]. The weight updation of APA algorithm depends on multiple recent past input vectors where as in LMS and NLMS algorithms the past input vectors are not considered.…”