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

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

Answer 1

[Star Strider]

See the documentation on fft (link). Specifically note the code between the first (top) two plot figures.

[Peter Mbamaluikem]

Sir, the link is asking me for a license activation code

[Star Strider]

Contact Support (link)

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