Implementation of AEC(Acoustic Echo Cancellation) on Cortex-M4

This paper presents the Acoustic Echo cancellation technique implemented on Cortex M4 processor. Acoustic echo is seen in full-duplex communication applications. The solution for the above problem is Acoustic echo canceller (AEC). The most important component of AEC is the adaptive filter. The performance of AEC are closely related to the underlying adaptive filter ( adaptive algorithm + adjustable filter). The adaptive filter used here is the Multi delay block frequency domain adaptive filter (MDF), which is a frequency domain adaptive filter.In terms of performance the MDF adaptive filter introduces smaller block delay and is faster, best suited for a time varying system. Here the AEC is realized by implementing MDF algorithm on the advanced ARM processors like Cortex-M4 processor.