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felix

Member

02-13-2002 09:36 AM

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I want to cross correlate 5 signals with constant delay. So I want the

function:

Corr(\tau)= \int(f1(t)*f2(t+\tau)*f3(t+2*tau)*f4(t+3*\tau)*f5(t+4*\tau))dt

Has anyone already written a vi like this? Would it be much faster if

I'd write it in C and would use the "Call Library Function"?

come and join us for skiing in Davos, Felix

Felix Tiefenbacher

Swiss Federal Institute for Snow- and Avalanche Research

Avalanche Dynamics

Fluelastrasse 11

CH-7260 Davos Dorf

Tel: +41 (0)81/417 02 53

Fax: +41 (0)81/417 01 10

Zvezdana S.

NI Employee (retired)

02-15-2002 12:58 PM

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What do you mean by "cross correlate signals?" What kind of signals do you have, are they related?

If you already have all of the values used in the function and are just concerned on how to implement this function into LabVIEW, you can use one of the Mathematics>>Formula VIs.

Zvezdana S.

National Instruments

02-20-2002 04:06 AM

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> Felix,

> What do you mean by "cross correlate signals?" What kind of signals do

> you have, are they related?

> If you already have all of the values used in the function and are

> just concerned on how to implement this function into LabVIEW, you can

> use one of the Mathematics>>Formula VIs.

>

> Zvezdana S.

> National Instruments

Yes, the 5 signals are related in the sense that they are similar but

time shifted. Using the cross correlation I want to calculate the

thime shift. The problem is that we have a lot of data. We sample 25

channels with 50 kHz in total. I was concerned about the velocity of

the vi and a simple handling.

Thanks Felix