spectral analysis using excel
spectral analysis using excel
(OP)
This is a pretty low level question. I have excel and need to do a spectral analysis of time based data. I did a FT in Excel, but don't have a clue regarding the output....it's a list of imaginary numbers. All I need is a simple spectral analysis of the data. I can select the amount of data to equal a power of 2. How do I get the analysis done and a graphical ouput?
I will greatly appreciate any insight you can provide.
1900paws1
I will greatly appreciate any insight you can provide.
1900paws1





RE: spectral analysis using excel
You will also get twice as much data as you really need based on symmetry of the fourier transform (assuming the input to your FFT were real numbers). The data will be symmetric about zero frequency. Throw out the negative frequencies (plot only frequencies from 0 to max).
Also if your original data is truncated in time by the rectangular sampling window and not periodic with a period = sample window length, you may consider premultiplying by a window funciton (such as Hanning) to minimize spectral leakage.
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RE: spectral analysis using excel
1900paws1
RE: spectral analysis using excel
Don