Figure 3
Computation of SE, NG measure and GA moments for different types of independent and dependent sources S 1 and S 2 . After a de-correlation step (whitening) the measures are computed using the polar parameterization y(θ)=cos(θ)X1 + sin(θ)X2where X1and X2are the whitened variables. The corresponding scatter plots are shown in the 1st row. The position of theoretical positions (in polar coordinates) are shown as red arrows. The measures were normalized in order to cover the range [0,1]. We used signals with a total number of samples T=106but we used only a subset of 10,000 samples to compute SE and NG measure to avoid the extremely high computational demand. For the generation of sub-Gaussian and super-Gaussian sources we used the transformation sinh−1(x) and sinh(x) applied to a Gaussian variable x, respectively.