function [whiteningMatrix,dewhiteningMatrix]=mfbox_whitenv(E,D,N)% Copyright by Peter Gruber % Signal Processing & Information Theory group% Institute of Biophysics, University of Regensburg, Germany% Homepage: http://research.fabian.theis.name%           http://www-aglang.uni-regensburg.de%% This file is free software, subject to the % GNU GENERAL PUBLIC LICENSE, see gpl.txtD = diag(D);N = min(N,min(D(:)));D = sqrt(D-N);DN = D;DN(DN>0) = 1./DN(DN>0);whiteningMatrix = real(diag(DN)*E');dewhiteningMatrix = real(E*diag(D));return