Numerisation of Acquired Data and Transforming into Frequency domain to process it with some mathematical expressions

[Motorbreath]

Hi everyone,

I've been trying to manage some signal processing stuff, I use mathscript node for it; due to the node, i have to transform the data set into numerical values. Due to my research, i should do my processing in frequency domain.

I did a VI, but i dont think it will work properly when i will use it with acquired data. The VI in the attachment has four dummy-signal sources, sines, consider these as analog input channels. The main question is actually how to process acquired data with numerical operations. And how to properly transform the time domain series into "numerical" frequency domain array.

Take a look at the example in the attachment. The other one is mathematical expression of the process.

Thanks,

OZGUR

[Motorbreath]

The main processing should be like that actually, but the numerical data that goes in the mathscript node does not gives true frequency result unless i turned that into a waveform. try the sample 'Impedance' below and see the difference.

Any other way different from mathscript node is also acceptable.

[Motorbreath]

Any suggestions?

[Samuel_S]

Motorbreath,

Here are some examples on how to use LabVIEWs graphcial coding to get things into the Frequency domain:

https://decibel.ni.com/content/docs/DOC-9981

http://zone.ni.com/devzone/cda/tut/p/id/13042

http://zone.ni.com/devzone/cda/tut/p/id/7111

http://zone.ni.com/devzone/cda/epd/p/id/2904

But essentially you are going to want to use the FFT VIs

http://zone.ni.com/devzone/cda/tut/p/id/4278

http://zone.ni.com/devzone/cda/tut/p/id/4541

http://zone.ni.com/devzone/cda/tut/p/id/3342

https://decibel.ni.com/content/docs/DOC-6390

I hope this gets you going 🙂

[Motorbreath]

Thanks for your response,

I'm little strange to labview's interface and programming issue, had been using Matlab for such processes.

The problem was about how any data type extracted and short after asking this question i've figured that out.

Thanks anyway,

özgür

[Motorbreath]

More complex problem is below;

http://forums.ni.com/t5/LabVIEW/Problem-with-1-D-array-of-cluster-of-three-Sound-and-Vibration/td-p/...

[Samuel_S]

Thanks for the update and for keeping the threads clean 🙂