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How to calculate frequency dispersion around median frequency in power spectral density ?

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Habib Ali
Habib Ali 2016-6-10
回答： Greg Dionne 2017-3-27
Hi, I need help in finding frequency dispersion around the median frequency. i have plotted the PSD using pwelch. I figured out I can find the median frequency using 'medfreq'. How do I find the frequency dispersion such that 68% of the total power lies in that range. The image shows the type of output I need to calculate. The blue dot represents the median frequency. The blue lines indicate the frequency dispersion such that 68% of the total power lies within the boundaries. Sampling rate is 30Hz Data length is around 450 points. I have zero padded before obtaining fft and psd. I also subtracted the mean from the data before zero padding. Any help in this regard would be helpful. Thanks in advance. Disclaimer : The image belongs to Matthew J.Johnson

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Greg Dionne
Greg Dionne 2017-3-27
Try Occupied Bandwidth (OBW).
Have a look at the frequency range (FREQRANGE) and percentage (P) arguments to help you customize the portion of bandwidth you want to estimate.

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