how to analyze frequency response ?

how to analyze frequency response of a audio file using freqz command ? can any one help ,i am a beginner to matlab

Answer 1

[Wayne King]

I don't think you want to use freqz() for that. You want to use either spectrogram() or periodogram(), or pwelch()

Which one of the above is the most appropriate depends on your goals. If you want to see how the energy distribution by frequency varies in the audio over time, then you will need to use spectrogram()

Answer 2

[Carlos]

Hi Gokul, freqz is used to find the frecuency response, once you have designed your b and a vectors.

[h,w]=freqz(b,a,n)

returns the filter's frecuency response. As far as I know freqz is used when you want to represent your filter's frecuency response, by doing

plot(w/(2*pi),abs(H)).

To find the frecuency response use fft.