FFT visualisation from a double signal

[purpleskies]

hello, 

im trying to make a real time FFT visualisation inside a loop of a double variable that change each iteration of this loop.

i tried using an array and doing a fourrier 1D interpolation evry 100 iteration. But i can't seems to be able to make it work

if someone know how i could do it, i would be thankfull :).

[santo_13]

Attaching the actual code would help than explaining a graphical code in words. Please save it in LV 2020 or older version.

[PsyenceFact]

Hi purpleskies,

There's a built-in FFT VI on the Signal Processing - Transforms palette.  It's polymorphic and can be used for real and complex 1D or 2D data.  If your loop is only generating a single data point at a time, there's also a point-by-point version.

PsyenceFact 

[purpleskies]

what is the name of this point by point fft ?

i put what i've done so far bellow

[PsyenceFact]

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@purpleskies wrote:

what is the name of this point by point fft ?

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It's FFT PtByPt.vi and it can be found on the Signal Processing  - Point By Point - Transforms palette.

You may find that the spectrum calculation functions on the Spectral palette provide you with data in a better format for visualisation.

PsyenceFact

[wiebe@CARYA]

Why not use the PtByPt FFT? (EDIT: Not sure how that crossed 4 messages...)

But for real nice visualization, use (PtByPt) STFT. It's better suited for continuous signals.