function [def,y] = NormedIFFT(x,l);
% l : longueur du domaine de definition en frequence
n = length(x);
y = ifft(rshift(fftshift(x)))*l/2/pi;
y = fftshift(y);
def = 2*pi/l * (-n/2 : n/2-1);


% Written by Maureen Clerc and Jerome Kalifa, 1997
% clerc@cmapx.polytechnique.fr, kalifa@cmapx.polytechnique.fr
    
    
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