multiple plots on graph at specific locations of signal

[shuri112]

Hi all,

I have a zero crossing detector to find out some special peaks/points on ECG signals. I am facing two problems here:

- I want to display each point as a different marker referenced by zero crossing detector on the graph of ECG signal. I took a look-around, found some examples nearly the same, I did try but could not get exactly what I want. 

- If you see closely to the graph "ECG signal" on my vi, you can find that some of zero crossings not shown exactly the peaks they should be on the ECG signal (i.e, R peaks). So how can I get rid of this error?

I greatly appreciate any suggestions.

Thanks a lot.

Shuri

[shuri112]

pls, could someone give me any advice here to deal with these issues?

[MAltmann]

Hi Shuri,

Could you point out an example of which peaks are not being correctly indicated?

[shuri112]

Thanks for replying me.

Actually, after running my vi and zoom in closer to QRS complex (by stretching time axis to smaller value, i.e. 0.5s, 1s, etc.), especially R peak, you can see that the zero crossings are not pointed correctly the time-location of R peaks that they should be.

In addition, I'd like to display those peaks/points that have been indicated by zero crossings in the same graph of ECG signal, how could I do this?

[Marcus_M]

Hello Shuri,

If you go to the modern controls pallet on the front panel, then to graph, and select a mixed signal graph, you can graph all of your data on one graph.  Use a bundle to combine any data you may have then feed that bundle into your mixed signal graph.  

Regards,

Marcus 

[shuri112]

Hi Marcus M,

Maybe I didn't explain clearly enough about what I mean in term of "multiple plots on one graph". Actually, the zero crossing detector detects changes in signal (ie. peaks/valleys, etc.) and what I really want is to display those changes in ECG signal. I don't mean to display 2 graphs together in one graph but just show by markers where are peaks/valleys/points indicated in ECG signals.

I did graph 2 graphs in one in my vi but it doesn't have any meaning.

Anw, thanks for your help. Pls give me any suggestions here.

[Steve.J]

You may find the free NI Biomedical Starter Kit useful in your project - you can find it on NI Labs here:

https://decibel.ni.com/content/docs/DOC-12646

Support for the toolkit is primarily through the Biomedical User Community at ni.com/biomedusers.

Cheers,

Steve