MATLAB: How to plot fourier amplitude spectrum and spectral density in matlab with given acceleration data

amplitudespectra

I have acceleration values with time. I need a matlab code. Thanks.

Best Answer

Your sampling frequency, ‘Fs’ is 100 Hz, according to the header line, so the Nyquist frequency, ‘Fn’ is 50 Hz.

See this documentation for fft to understand how to plot the spectrum. See specifically the code between the first two plot figures. That is the essence of what you need to know to calculate and plot the spectrum.

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MATLAB: Amplitude spectrum

There are a couple things you can do. Let x be your speech signal and fs your sampling frequency. The following two are power estimates.

    plot(psd(spectrum.periodogram,x,'Fs',fs));
If you do not want it in dB:
    psdest = psd(spectrum.periodogram,x,'Fs',fs);
    plot(psdest.Frequencies,psdest.Data);
    xlabel('Hz'); grid on;

Finally, just using fft()

      xdft = fft(x);
      % assume x is even length
      xdft = xdft(1:length(x)/2+1);
      freq = 0:fs/length(x):fs/2;
      plot(freq,abs(xdft));
      xlabel('Hz');

MATLAB: Code for ploting fourier transform spectrum

spectrogram()

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