FFT Peak at Zero

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Matlab1364
Matlab1364 2019-3-29
评论： Mohamad Mossad 2019-12-10
Hello,
I am trying to plot the FFT for a data set I have. I keep getting a peak around zero and have problem with filtering. I also tried the detrend function, but I still don’t get a nice plot. I have attached my data set. I am planning to calculate FFT for the “roll” column from my data set. I appreciate your help.
  2 个评论
dpb
dpb 2019-3-29
The zero component in the FFT corresponds to the DC component of the signal...to remove, subtract mean(roll)
Image Analyst
Image Analyst 2019-3-29
Just what I was going to say, so put it down in the Answers section so you can get credit for it.

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回答（1 个）

Catalytic
Catalytic 2019-3-29
编辑：Catalytic 2019-3-29
Apply fftshift to your spectrum to see it with DC centered in the plot.
x=csvread('230.csv',1,0);
rollSpectrum=fftshift(fft(x(:,2)));
plot(abs(rollSpectrum))

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