A new pre-processing method for multi-channel echo cancellation based on fuzzy control

The essential problem of multi-channel echo cancellation is caused by the strong correlation of two-channel input signals and the methods of preprocessing are always used to decorrelate it and the decorrelation degree depends on nonlinear coefficient alpha. But in most research, alpha is constant. In real application, the cross correlation is varying and alpha should be adjusted with correlation. But there is not precise mathematical formula between them. In this paper, the proposed method applies fuzzy logic to choose a so that the communication quality and convergence performance can be assured on the premise of small addition of computation. Simulations also show the effect of validity method.