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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Peter Mbamaluikem 2017-6-26

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评论： Star Strider 2017-6-26

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Answer 1

Star Strider 2017-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/346260-i-sampled-a-50hz-signal-at-800hz-and-i-want-to-use-fft-to-extract-the-magnitude-of-the-fundamental-f#answer_271991

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

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Peter Mbamaluikem 2017-6-26

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

Star Strider 2017-6-26

在 MATLAB Online 中打开

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