Median Frequency(Fmed)

Question

shez96 2012-4-9

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评论： krn99 2017-4-5

I need help finding the Median frequency of a power spectram. (Fmed), I am new to matlab so any helo will be really appreciated.

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Answer 1

Wayne King 2012-4-9

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在 MATLAB Online 中打开

Hi Shenal, you can do the following:

   t = 0:0.001:1-0.001;
   x = cos(2*pi*50*t-pi/4)+0.5*sin(2*pi*100*t)+randn(size(t));
   psdest = psd(spectrum.periodogram,x,'Fs',1000,'NFFT',length(x)); 
   normcumsumpsd = cumsum(psdest.Data)./sum(psdest.Data);
   Ind = find(normcumsumpsd <=0.5,1,'last');
   fprintf('Median frequency is %2.3f Hz\n',psdest.Frequencies(Ind));