Design & Simulation of Time Varying Convergence LMS Filter

Acoustic echo cancellation is a common occurrence in today's telecommunication system. It occurs when an audio source and sink operate in full duplex mode. An example of this is a hands- free loudspeaker telephone. In this situation the received signal is output through the telephone loudspeaker (audio source), this audio signal is then reverberated through the physical environment and picked up by the system microphone (audio sink). The effect is the return to the distant user of time delayed and attenuated images of their original speech signal. The signal interference caused by acoustic echo is distracting to both users and causes a reduction in the quality of the communication. This thesis focuses on the use of adaptive filtering techniques to reduce this unwanted echo, thus increasing communication quality