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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: Generalized cross correlation
Replies: 5   Last Post: Jan 25, 2013 11:26 PM

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Kamran Iranpour

Posts: 19
Registered: 7/28/11
Generalized cross correlation
Posted: Aug 20, 2012 3:02 AM
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Generelized cross-correlation (GCC) is said to be a better estimate of
cross-correlation for time-delay estimation between channels. It is a
whitening technique on cross-cspectra.
I have this small code for computing the GCC:

fChannel1 = fft(channel1);
fChannel2 = fft(channel2);
conjFChannel2 = conj(fChannel2);
num = (fChannel1).*conjFChannel2;
den = abs((fChannel1).*(conjFChannel2));
fGeneralized = num./(den+eps);
generalizedCrossCorrelation = ifft(fGeneralized);
[maxcorr phind] = max(fftshift(generalizedCrossCorrelation));

But my "phind" which is is the index of maximum is always zero. Is
anyone familiar with the technique?

Thanks,

Kamran

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