Spectrum example

[GerryMar]

Where can I find an example of a spectrogram plot (freq vs time) in LabWindows ?

[MajklS]

C:\Users\Public\Documents\National Instruments\CVI2017\samples\apps\freqresp

C:\Users\Public\Documents\National Instruments\CVI2017\samples\analysis\peakest.cws

C:\Users\Public\Documents\National Instruments\CVI2017\samples\analysis\thd.prj

C:\Users\Public\Documents\National Instruments\CVI2017\samples\analysis\windowng.prj

[GerryMar]

MajkIS,

I've seen these programs in CVI's examples. None of these have the plot I'm look for.

I'm trying to find something like the upper right plot.

This is LabVIEW program I found at

https://forums.ni.com/t5/Example-Programs/Audio-Analysis-Time-Domain-FFT-Spectrogram/ta-p/3525552?pr...

Note:  I'm not that familiar with Signal Processing so it might be an easy calculation to create this plot. I just need to see that process.

Thanks,

Gerry

[gdargaud]

I think this is a display of a wavelet transform. Once you have it computed in a matrix, it can be displayed in CVI as an intensity plot. And you can compute it in various ways, one of them being being the spt.fp (Signal Processing Toolset). Or just use the GNU Scientific Library.