Power Spectral density

[kiarash]

Hello All

I have an analoge signal which I would like to find its main frequency

so I have used Power Spectral Density to find the main frequency

I can estimate that but is there any way through Labview function

to know the main frequency exactly? I mean I want to know the

frequency of the peak in Power spectral density.

Thanks ever so much for your help

cheers,

Kia

University of British Columbia

[Nann]

If your signal is of single tone or multitone, you can use the Extract Single Tone Information or Extract Multi Tone Information VI respectively.  The VIs will estimate the PSD and find the peak(s) automatically. 

You also can estimate the PSD by yourself and then call the Peak Detector VI to find the peaks.  You can find the Peak Detector VI on the Signal Processing>>Signal Operation palette.  If you have LabVIEW Advanced Signal Processing Toolkit, you can use the WA Multiscale Peak Detection VI to find the peaks, which is more robust.

[kiarash]

Thank you very much for your information. but just a little problem 🙂

I have Advanced signal Processing toolkit but I could not find the VI that you mentiond in Advanced signal processing

would you please tell me where it is?

thank for you help

kia

[Nann]

You can find the WA Multiscale Peak Detection VI on the Addon>>Wavelet Analysis>>Feature Extraction palette.