Envelope spectrum
The sample illustrates a calculation implementation for an envelope spectrum with the function block FB_CMA_EnvelopeSpectrum. The input signal is generated with a function generator. It corresponds to the superposition of two sine waves with 120 Hz and 230 Hz. For a better illustration of the result, the scope is limited to the frequency range from 0 Hz to 300 Hz.
The sample is available for download from here:
EnvelopeSpectrum_Sample.zip
Block diagram
Program parameters
The table below shows a list with important configuration parameters for the function block for calculating the envelope spectrum.
FFT length envelope | 2048 |
FFT length spectrum | 2048 |
Window size | 2048 |
Conversion to decibels | FALSE |
Window type | eCM_HannWindow |
Scaling type | eCM_RMS |
Requirements
|
Development environment |
Target system type |
PLC libraries to include |
|---|---|---|
|
TwinCAT v3.1.4013 |
PC or CX (x86, x64) |
Tc3_CM, Tc3_CM_Base, Tc3_MultiArray |