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 pre-processing are always used to decorrelate it and the decorrelation degree depends on nonlinear coefficient α. But in most research, α is constant. In real application, the cross correlation is varying and α 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 α 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.