Azzera filtri
Azzera filtri

i sampled a 50Hz signal at 800Hz and i want to use FFt to extract the magnitude of the fundamental frequency (50Hz). how do i go about it? Please can anyone be of help. Thank you

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i sampled a 50Hz signal at 800Hz and i want to use FFt to extract the magnitude of the fundamental frequency (50Hz). how do i go about it? Please can anyone be of help. Thank you

Risposte (1)

Star Strider
Star Strider il 26 Giu 2017
See the documentation on fft (link). Specifically note the code between the first (top) two plot figures.
  2 Commenti
Star Strider
Star Strider il 26 Giu 2017
This is essentially the code I referred to:
D = Your_Signal;
Fs = 800; % Sampling Frequency (Hz)
Fn = Fs/2; % Nyquist Frequency (Hz)
L = length(D);
FTD = fft(D)/L;
Fv = linspace(0, 1, fix(L/2)+1)*Fn; % Frequency Vector (Hz)
Iv = 1:length(Fv); % Index Vector
figure(1)
plot(Fv, abs(FTD(Iv))*2)
grid

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