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Urgent: How do I perform FFT on a time signal
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I have a vibration time signal am working on. I am finding it difficult to write the code to perform fft on it. Could anyone help with it please? The length of the signal is 40000 while the sampling frequency is 20000.
Additionally, how are the length of the signal and sampling frequency arrived at?
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Jan
2013-7-31
While this question might be "urgent" for you, it is not "urgent" for all readers. Therefore it is recommended toavoid such pushing terms.
回答(3 个)
dpb
2013-7-26
doc fft
Sampling frequency is set by the hardware, time then determines the length.
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Youssef Khmou
2013-7-26
编辑:Youssef Khmou
2013-7-26
hi, given your signal X,
Fs=2e+4;
Resolution=512;
Ts=1/Fs;
N=4e+4;
T=N*Ts;
Fx=abs(fft(X,Resolution));
Frequency=(0:Resolution-1)*Fs/Resolution;
figure, plot(Frequency(1:end/2),Fx(1:end/2)); % two sided to one side
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