Splitting a DTMF signal from a wav file using Matlab

Question

Here is the context of the problem: I have a DTMF signal in wav format, I have to identify the number sequence it has encoded. I must do so using fast fourier transform in M

Answer 1

This worked for me:

windowSize = 256;   
nbWindows = floor(L / windowSize);

for i=1:nbWindows
    coeffs = fft(signal((i-1)*windowSize+1:i*windowSize));    
    plot(abs(coeffs(1:N)));
    waitforbuttonpress
end;

This way it is possible to shift the window until the end of the input signal