crosscorrelation

[LVFan]

I need a realy fast crosscorrelation-function for signal-processing. LabView has a builtin-crosscorelation-function but this is a aperiodic correlation, I need a periodic CC. I created the function I need in LabView, but it need nearly twenty times longer than the built in function. I´ve tried if a .dll is faster but it is not faster than my old function. I think this damned for-loops slow down the algorythm.
Can anybody help me, making this algorythm faster?

I would be very grateful for some hints.

(Excuse me please for my bad english.)

[wxfield]

Hello 0987,

Can you attach your periodic cross correlation files to the thread? It would be helpful to diagnose your problem.

Kindest regards,
Warren

[LVFan]

Hello Warren,

Here is my LabView-VI for Periodic Cross Correlation. The other file is my C-Code for the DLL. (I'm using VC++ 6.0)

Kindest regards,
German Student (former 0987).