Echo Cancellation Essay
ECHO CANCELLATION IN TRACED AUDIO USING DSP PROCESSOR
K.V.Mohana Prasath [1], Dr.N.Kasturi [2]
[1 ]PG Scholar, school of communication and Computer sciences, [2]Professor,school of communication and Computer sciences
Department of Electronics and Communication Engineering ,
Kongu Engineering College, Perundurai-638052
Mohankvecr@gmail.com , kasturisena@gmail.com
Abstract - Acoustic echo cancellation is a common occurrence in today’s telecommunication systems. Currently, echo cancellation is a most interesting and challenging task in any communication system. Echo is a delayed and degraded version of original signal that travels back to its source after several reflections. Eliminating this effect without affecting the original quality of the speech is a challenge of research in present days.
Most of the real time application concentrates echo cancellation only as a software processing technique. In
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INTRODUCTION
Echo cancellation is one of the most widely used digital signal processing devices in the world because each telephone call requires a pair of echo cancellers. Echo cancellation is an essential signal enhancement tool in hands-free communication. Acoustic echo is caused due to leakage from the loudspeaker to the microphone in settings like hands free telephony. Basically, a transversal filter, which is adaptively modeling the echo path impulse responses, generates an estimate of the echo, with this an echo estimate is created at the right time to cancel the actual echo. The common problems faced by echo cancellation are the convergence time and the degree of cancellation. Convergence time is the time taken to reach an acceptable level of steady state residual echo. Degree of cancellation is the amount of echo cancelled, measured in Echo Return loss Enhancement. In Adaptive acoustic echo cancellation , the convergence time is high and due to the large number of multiplications it is rather costly to be
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