fft of a finite duration real signal
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Hello
I have signal which is finite in duration sampled at a certain frequency and has a lot of noise buried in the signal. I am trying to plot the spectrum using fft to find out what frequency the signal is in. I don't know if I am doing the fft right. The plot of time vs amplitude and spectrum is in the link below.
Can anyone please help? Thanks
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
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Walter Roberson
am 20 Apr. 2011
What was the sampling frequency? It is difficult to make out on the graph but it appears you might have had 4 seconds of data at 30 kHz ?
Your frequency data is packed pretty tightly; you might want to zoom in on it. The interesting parts might be below 1 kHz or so.
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