Hello all, I have a sound signal in time domain , How can I take the FFT of a excerpt of it, say a 40ms section from 0.026sec to 0.3sec? Ive just been able to plot that segment in time domain, but I can not figure out how to plot its spectrum.. Here is my code, I hope someone can make it done.. Cheers,
clear allclose allclc%%Loading,Plotting and Listening to the signal
figure[signal,Fs,nbits,opts] = wavread('stry.wav'); % Load
tSampling=1/Fs;n=length(signal);t=(0:n-1)*tSampling; %Making the time vector
plot(t,signal); % Plot
sound(signal,Fs); % Listen
%%2)Plot a 40ms section in the middle of the vowel /iy/
figureplot(t,signal)axis([0.3 0.34 -0.2 0.2]);%%Taking FFT
signalF=fft(signal(0.03:0.34),1024);fAxis=-Fs/2:Fs/1024:Fs/2-Fs/1024; %Making the frequency vector
plot(fAxis,abs(signalF));title('Spectrum of signal(t)');xlabel('Frequency (Hz)');ylabel('|signal(f)|');
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