MATLAB: Spectrogram function: phase and magnitude

Question

Hi,

I read the Spectrogram function and I sort of understand it, but I have a question. As stated in the definition, the Spectrogram returns the Short-time Fourier Transform of the input signal. When I take a STFT, I must get two components: magnitude and phase. I assume that the magnitude vector is what we get from the Spectrogram, but what about the phase? Please help!!!!

Thanks

Answer 1

The spectrogram function returns complex numbers, which include both magnitude and phase information.

   [S,F,T] = spectrogram(...);
   A = abs(S);
   phi = angle(S);