[SOLVED] How to normalize signal for correlation

[karanbanthia]

Hello all,
I am using dsPIC30f4011 for signal processing and programming the same using MPLAB C30 compiler. I am scanning two signals simultaneously using ADC in signed fractional format. When I use VectorCorrelate to find cross-correlation between them, it gives me a Math Error since some of the result values are greater than 1. After searching a remedy for the same, I came across a solution suggesting to find normalized cross-correlation which takes care of this saturation problem but I am not sure how to do this. Can anyone please guide me to calculate normalized cross-correlation?

Thanks in advance.

 

[emresel]

Hi;
As i read here you need to normalize vectors [x-mean(x)]/sqrt(var(x)).
not sure about it, but might give you a starting point.
This may also help you: http://paulbourke.net/miscellaneous/correlate/
Good luck.