Addition of waveform with adding block - element wise or interpolated or...?

Hello

I see the block addition is beautifully overloaded to overlay waveforms and I would like to know how it works. Specifically, I want to know if using matrix addition (i.e. simply by adding the elements of each waveform) OR is he among the waveforms by interpolation and resampling to the points of time corresponding to the other or another method.

I know that the sampling interval (dt) should be the same for both waveforms added, so I suspect it is using matrix addition, but don't know.

To add a bit of context, I use this to add two waveforms of sampled data of a sinus waves up to 100 kHz. Sampling faster than my DAQ can exploit the difference in the two waveforms of departure time (t0) is an important part of the period. At this point, I think that the approach by adding simple matrix will not work.

Thanks for any idea that you can give. See you soon

-ron

Hi Ron,

I don't think there is a VI that does it for you. However, it should not be too difficult to program yourself. There's a Subvi, called 'Get waveform components' that allows you to access the table variables (Y) t0, dt and the data type of waveform data. You can subtract the two start times to find the difference between the two waveforms (DAQ readings put a timestamp on the data). Then you can complete the table operations to create a lag in the data. A few other useful subvis are "Get the subset of waveform" or "Index Waveform Array", you can use depending on how you want to set up your program. Let me know if you need help with this programming. Good luck!

Tags: NI Software

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