Windowing compensation factors

[kosme]

I am finishing the merge of the development branch into the main branch, which requires lots of documentation. One of the things that must be explained is where the compensation factors for the Windowing process come from. The original author of the branch, Bim Overbohm, does not seem to be active on GitHub anymore. Can anyone else provide a clear explanation?

arduinoFFT/src/arduinoFFT.h

Line 487 in 419d7b0

const T ArduinoFFT<T>::_WindowCompensationFactors[10] = {

03/06/24 Edit:
Bim is still active on Github, I just cannot tag him on this issue.

[wx85105157]

Adding a window function to the signal can reduce the leakage of the spectrum, but adding the window function will cause attenuation of the signal value. At this time, the signal value needs to be corrected.

You can refer to the information at this link：
https://www.mathworks.com/matlabcentral/answers/372516-calculate-windowing-correction-factor