Frequency Analysis by Simulink

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cyberdyne
cyberdyne 2011-9-7
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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回答（2 个）

Rick Rosson
Rick Rosson 2011-9-7
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));
HTH.
Rick
  1 个评论
cyberdyne
cyberdyne 2011-9-15
Ok. But I would like to make it by Simulink blocks (using .mat file block), how could I do it ?

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Rick Rosson
Rick Rosson 2011-9-7
Alternaitively, you could use the function freqz. For more information:
>> doc freqz
HTH.
Rick

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