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Normalising spectra - pwelch method

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Bran
Bran 2014-7-24
I am trying to normalise some frequency spectra that I have created using the FFT. I was wondering how it is done with the pwelch spectra. It says that normalisation is carried out but doesnt detail how.
I have thus far being using Spectralintensities/max(Spectralintensities) But wanted to bring it in line with pwelch. I am doing this so I can effectively compare one signal to another

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