Frequency Analysis by Simulink

Question

cyberdyne 2011-9-7

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Hi,

Can someone explain me the steps to do spectral analysis of a signal that I have in a .mat file (sample rate used=1kHz).

I would like to display signal in frequency domain and extract some parameters as mean frequency.

I've tried to use spectrum scope block but it returns an error in some S-function.

Thanks

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Fangjun Jiang 2011-9-7

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Answer 1

Rick Rosson 2011-9-7

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I would recommend trying it in MATLAB first. In the following code, I am assuming that the signal is stored in an M x 1 array called x, and that the sampling rate is a scalar called Fs:

   filename = ...
   x = load(filename);
   Fs = 1000;
   M = size(x,1);
   dF = Fs/M;
   f = -Fs/2:dF:Fs/2-dF;
   X = fftshift(fft(x));
   figure;
   plot(f,abs(X));