On Mon, 21 Aug 2006, matthew jones wrote:
cross-correlation
[...]
This is all time domain stuff. As Jamie says, freq domain can be harder to interpret.
Cross-correlation in the time domain is the same as ordinary product by conjugate. This is again the Convolution Theorem, with a slight variation because of the little difference between convolution and cross-correlation.
This means that cross-correlation of two sinewaves of different frequencies will be zero, and cross-correlation of two sinewaves of same frequency will give a sinewave of that same frequency again, with an amplitude that is the product of the two amplitudes, and a phase that is the difference of the two phases. (in convolution, phases add up instead).
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju | Freelance Digital Arts Engineer, Montréal QC Canada