Estimation spectrale Méthodes non-paramétriques
Estimation spectrale Méthodes non-paramétriques
Estimation spectrale Méthodes non-paramétriques
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En fait, la fenêtre introduit un compromis entre la<br />
résolution <strong>spectrale</strong> (largeur du lobe principal) et la<br />
fuite de spectre (amplitude du lobe adjacent).<br />
Code en MATLAB<br />
function Px = mperiodogram(x,win);<br />
N = length(x);<br />
w = ones(N,1);<br />
if (win == 2) w = hamming(N);<br />
elseif (win == 3) w = hanning(N);<br />
elseif (win == 4) w = bartlett(N);<br />
elseif (win == 5) w = blackman(N);<br />
end<br />
U = norm(w)^2/N;<br />
xw = x(1:N).*w;<br />
Px = abs(fft(xw,1024)).^2/(N*U);<br />
INRS-EMT J. Benesty 12
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