how can I recover original frequencies from a data table acquired from osciloscope?

Question

André Luiz Regis Monteiro 2014-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/146422-how-can-i-recover-original-frequencies-from-a-data-table-acquired-from-osciloscope

回答： Daniel kiracofe 2014-8-13

Could someone help me with this issue?

Supose that I made a fake signal from:

t=0:1:1023;
w1=(t/1023)*720;
w2=(t/1023)*360;
w3=(t/1023)*180;
w4=(t/1023)*90;
v=1+10*cosd(w1)+4*cosd(w2)+2*cosd(w3);
i=2+10*cosd(w1)+4*cosd(w2)+2*cosd(w4);

How can I recover all original frequencies (720, 360, 180, 90) if I have only a data table generated by equations above ? (and I don't know the equations)

Thanks a lot for your time.

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Answer 1

Daniel kiracofe 2014-8-13

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well, fft() function is a good start. I'm guessing if you are asking this, then you don't know much about fft() function. This little tutorial I wrote may help you: http://mechanicalvibrationc.domain.com/Making_matlab_s_fft_functio.html