Design and Simulation of an Adaptive Acoustic Echo Cancellation (AEC) for Hands-Free Communications using a Low Computational Cost Algorithm Based Circular Convolution in Frequency Domain

In this paper a module consisting of a Fast Least Mean Square (FLMS) filter is modeled and verified to eliminate acoustic echo, which is a problem for hands free communication. However the acoustic echo cancellation (AEC) is modeled using digital signal processing technique especially Simulink Blocksets. The needed algorithm code is generated in Matlab Simulink programming. At the simulation level, results of simulink implementation prove the module behavior for cancellation of echo in hands free communication using the FLMS adaptive algorithm. The main scope of this paper is to implement the module, benefiting the advantage of circular convolution properties and Fast Fourier Transform (FFT) high computation speed in frequency domain rather adaptive algorithms Normalized Least Mean Square (NLMS) and Recursive Least Square (RLS) in time domain with high complexity. Keywords—Adaptive Algorithm, AEC, Circular Convolution, Fast Fourier Transform (FFT), Digital Signal Processing (DSP).