Fourier Transform of window functions

Hello!

I am trying to figure out how to graph the fourier transform of different window functions but i cant seem to get the correct image like the one i attached for my fft window graph.

Answer 1

[Mathieu NOE]

hello

maybe this can help you

wL = 30; % window length
win1 = hanning(wL);
win1 = win1/sum(win1); % normalize

win2 = triang(wL);
win2 = win2/sum(win2); % normalize

nfft = 256;
S1 = fft(win1,nfft);
S2 = fft(win2,nfft);
f = 1:nfft/2+1;
plot(f,20*log10(abs(S1(1:nfft/2+1))),f,20*log10(abs(S2(1:nfft/2+1))));
ylabel('dB gain')
xlabel('fft bins');
legend('hanning','triangle');

[Chandi]

Thank you that is very helpful! :)

[Mathieu NOE]

My pleasure !