autocorrelation

[molder]

Hi,

Im trying to find a pattern in e.c.g Signal.

I would like to be able (in offline) to indicate two points on the ecg plot and then i will serach for this section througout the signal

A search known as auto correlation of a time\voltage series

Is there a function in LabView 7.1 to do so? i would like to create a subVI for using it in other llb as well

Many Thanks

[Jarrod_S.]

How do you intend to indicate two points on the ecg plot to search for/through? Are you interested in using graph cursors or numeric controls?

Do you mean you intend to search for a specific pattern throughout your signal, which you will specify beforehand? What format is your signal coming in as? Waveform, array?

[molder]

Thanks for the prompt response.

I intend to have graph cursors indidate the pattern search through the all signal. The seach should be done on both waveform and an Array

Thanks

Amir

[Jarrod_S.]

An Autocorrelation VI is available in LabVIEW at the following location from the block diagram:

All Functions >> Analyze >> Signal Processing >> Time Domain.

This VI is not a available in the base package of LabVIEW. If you have LabVIEW 7.0 or above, there is an Express VI called Convolution and Correlation available from the Signal Processing Express palette.

[molder]

Many Thanks, Jarrod.

I'll play with it, hope it works 🙂