amplitude spectrum

Question

deji 2011-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/21096-amplitude-spectrum

hi, how do i plot the amplitude spectrum of speech segment with a given sampling frequency fs, a given length and known number of bits. thanis in advance

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Answer 1

Wayne King 2011-11-13

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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');