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From Sharp Teal, 4 Years ago, written in Matlab M-file.
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  1. T = readtable('aa.csv');
  2. a=table2array(T);
  3. x=a(:,1);
  4. y=a(:,2);
  5. Fs=44100;
  6. L=0.01052;
  7. Y=fft(y);
  8. P2=abs(Y/L);
  9. f = Fs*(x);
  10. plot(f,P2,'b')
  11. xlabel('f (Hz)')
  12. ylabel('|P1(f)|')