amplitude spectrum
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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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Wayne King
2011-11-13
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');
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