Survey On Acoustic Echo Cancellation Based On Adaptive Filter

Kusum Sahu, Rahul Sinha

In digital signal processing an Adaptive filtering constitutes one of the core technologies and finds numerous application areas in science as well as in industry. In wide range of applications Adaptive filtering techniques are used, including echo cancellation, adaptive equalization, and adaptive noise cancellation. An adaptive filter is a system with a linear filter that has a transfer function controlled by variable parameters and a means to adjust those parameters according to an optimization algorithm. Echo is the reflected copy of the voice heard some time later and delayed version of the original.In telecommunication system Acoustic Echo cancellation are used. When interference of the signal occurred by Acoustic Echo, then it discomposes to the user and thus the quality of communication is reduces. Echo cancellers are very successful and today almost no echo at all can be perceived while using telephones. In this paper RLS algorithm was implemented for the echo cancellation.By using this algorithm MSE (mean square error) can be reduced, convergence rate can be improved and thus increasing the communication quality.