FFT averaging mode

[AdrianoScarano]

Good morning,

FFT averaging in LabView permits to choose between different averaging mode (RMS, vector or peak hold) and different weighting mode (linear or exponential); is there someone who can explain in a detailed way these parameters? Thank you in advance.

[BertMcMahan]

The Help isn't super detailed, but it's a good place to start:

https://www.ni.com/docs/en-US/bundle/labwindows-cvi/page/advancedanalysisconcepts/average_improve_me...

The short version is, it depends on your signals and what you're trying to measure.

[altenbach]

"FFT power spectrum and PSD" is a polymorphic VI and the code depends on the type of signal (real, complex, one or multiple signals, etc.). The very nice thing is that everything is implemented in pure G and none of the diagram are locked. You can just dig through the diagrams and see exactly what and how it does it. 😄

What kind of signals do you have and what kind of output is important for you?

[dsb@NI]

Try these documentation links from the LabVIEW Sound and Vibration Toolkit:
Averaging Modes - NI (RMS, Vector, Peak Hold)
Time-Domain Analysis - NI (linear and exponential)