MATLAB: Xcorr – plot correlation across time.

audiocorrelationcross correlationMATLABtimexcorr

Hi,
I'm very new to Matlab and what i'm trying to do is find the correlation of two separate audio .wav files. At the moment I have the following (x & y are my .wavs):
    C = xcorr(x,y,'coeff');
    ICC = max(abs(C));
This allows me to find the point with the highest correlation, right?
But what I want to do is take a reading of the xcorr or 'C' at 80ms intervals so I can plot the correlation over time, rather than just at one point.
Any ideas?
Thanks in advance.

Best Answer

   t = 0:0.001:1-0.001;
   x = cos(2*pi*100*t)+randn(size(t));
   y = sin(2*pi*100*t)+randn(size(t));
   [xc,lags] = xcorr(x,y,'coeff');
   stem(lags*0.001,xc);
The above gives the lags as sampling intervals, 0.001 seconds in this example.
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