Increasing xcorr() resolution

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Patrick Tamellini
Patrick Tamellini on 27 Apr 2011
Hello,
Is there a wa y to increase the "resolution" of xcorr?
Something like zero padding for the fft()
Thanks,
Patrick

Accepted Answer

Daniel Shub
Daniel Shub on 28 Apr 2011
Zero padding will increase the frequency resolution (i.e., reduce the spacing between frequency components), but does not affect the temporal resolution (the time between samples). The resample function increases the temporal resolution, but does not affect the frequency resolution.
a = [0, 0, 1, 0, 1, 0, 0];
b = [0, 0, 1, 1, 1, 0, 0];
upFactor = 10;
aUp = resample(a, upFactor, 1);
bUp = resample(b, upFactor, 1);
[r, lags] = xcorr(a, b, 'coeff');
[rUp, lagsUp] = xcorr(aUp, bUp, 'coeff');
lagsUp = lagsUp/upFactor;
plot(lags, r, 'b', lagsUp, rUp, 'r');
It you do not want a normalized cross-correlation, you will need to scale rUp.

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