回應： How to Plot the Envelope of the resulting signal of 2 random signal？

[Ying88827]

Maybe i should ask how to increase the accuracy of the envelope？

[arevh]

For this kind of signals I think its better to detect the peaks and valleys instead of using the Hilbert transform. Just in this case you will not get smooth waveform, but lines connecting the peaks/valleys.

Thanks,

Arev

[Ying88827]

Thx for ur reply！ so is it mean that i need to find those max and min first，then link them together to get a smooth envelope？ do u have any example vi？ thx！

[arevh]

I have attached the code with Peak/Valley detection part added. Just as I noted the envelope is not smooth, as the graph just connect the peaks/valleys with lines.

Thanks,

Arev

[Ying88827]

Sorry to have so many questions.

If I use the data attatched to be my input signal, how can I get the envelope? Why can't I use the pervious vi to do it? Thx

[arevh]

You will not get envelope for the current waveform with Hilbert Transform.

But using Peaks/Valleys you will be able to get something more similar to the envelope, as in the image below.

Thanks,

Arev

CTO | RAFA Solutions 

[Ying88827]

Sorry， im new in labview......can you share the code？i dun know how to conect the cluser（the pink wire）to the 1D array（the brown wire）..

[arevh · Accepted solution]

Please find the code attached.