peak detection with two thresholds

[Current_93]

David, please save the vi in version 8.6.

[Current_93]

Dear David,

Can you advise me how to do the same but with C:\Program Files\National Instruments\LabVIEW 8.6\vi.lib\Analysis\8numeric.llb\Threshold Peak Detector.vi 

This  "Threshold Peak Detector.vi" is more simpler than others and thus it works faster. In my task "faster" is very needed.

Please, advise me.

[DavidJCrawford]

Sorry, I am on vacation at the moment and not near a pc with labview.

I am sure somebody else will jump in to help.

Cheers

David

[elset191]

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Current 93 wrote:

Dear David,

Can you advise me how to do the same but with C:\Program Files\National Instruments\LabVIEW 8.6\vi.lib\Analysis\8numeric.llb\Threshold Peak Detector.vi 

This  "Threshold Peak Detector.vi" is more simpler than others and thus it works faster. In my task "faster" is very needed.

Please, advise me.

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Threshold Peak Detector.vi and Peak Detector.vi that David used have different functionality.  It may work faster, I'm not sure, but it works different too, make sure it is what you want.

[elset191]

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I wrote:

Threshold Peak Detector.vi and Peak Detector.vi that David used have different functionality.  It may work faster, I'm not sure, but it works different too, make sure it is what you want.

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Notice Threshold Peak detector only detects peaks that go above and then below the threshold line.  Peak Detector finds all local maxima.  Also, the information returned by Threshold Peak Detector isn't as nice (as you can see by the red dots not being right on the peak but on one of the slopes going to the peak.  This obviously can be remedied, but I didn't do it here.  See here and here if you go down that road.)

[Current_93]

Dear Tim!  Thank you very much for your support, but for my task and for my input signal is approaches threshold peak detector.  For my 3M input record it is faster than other peak detectors. 

[elset191]

Well, here's David's vi with Threshold instead.  It doesn't work quite the same because of the issue I mentioned in my last post with the found peak not exactly lying on the real peak.

[fops]

How do you create two threshold, and calaulate the number of peaks both positive and negative peaks outside of the two threshold. the reason is because i want to get peaks from both ngeative and positive from the 2 threshold values. Hope that u could give me some examples on how to build it?

[NikTesla]

Hello fops!

The Peak Detector.VI can be used to identify peaks as well as valleys that fall above or below a specified threshold. I’d suggest thoroughly looking through the above posts and referencing the context help for the Peak Detector VI.  If afterwards you still have unanswered questions, I’d recommend starting a new thread. This thread is almost five years old and is less likely to be viewed by the NI community members. Starting your own thread will provide you with quicker responses to your questions from members.