Fast fourier transform of a voice signal?

Hi! I want to do fft of an voice signal that i record. i recorded the voice and opened with matlab. And i must also plot the signal on frequency domain. my signal's values are;

Fs=48000 Hz N=13741 bits=16

so what can i do for solution?

Answer 1

[Walter Roberson]

S = fft(TheSignal);
plot(real(S));

Answer 2

[Wayne King]

You can certainly obtain the Fourier transform of it to get a frequency domain representation. From your description that it is a voice signal, it may well be that the spectrogram (the short-time Fourier transform) is a better choice.