ICA盲源分离，实现对未知混合信号进行盲分离；低通滤波器。(BSS using eigenvalue value decomposition
Program written by A. Cichocki and R. Szupiluk
X [m x N] matrix of observed (measured) signals,
W separating matrix,
y estimated separated sources
p time delay used in computation of covariance matrices
optimal time-delay default p= 1
First stage: Standard prewhitening)