Windowed FFT magnitude / leakage effect

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Tom Bedkowski
Tom Bedkowski on 5 Jul 2019
Edited: Tom Bedkowski on 1 Aug 2019
Hello,
i am doing an windowed fft to get the magnitude by a frequency.
But the result of the magnitude is not the magnitude of the sampled summation of sinusfunction, which i defined.
This effect is the leakage effect and i heard about a correction factor to get the right magnitude from the windowed fft.
Thank you for help!

Answers (1)

Samatha Aleti
Samatha Aleti on 17 Jul 2019
Hi,
You may calculate & apply Amplitude correction factor to compensate the leakage effect. Here is an example
N= 100;
w = hann(N);
% correction factor
Cf=length(w)/sum(w);
  1 Comment
Tom Bedkowski
Tom Bedkowski on 1 Aug 2019
Edited: Tom Bedkowski on 1 Aug 2019
Thank you for help.
Yes that is the first correction which i done.
But there is a futher correction which depends on the specific window.
More in this hyperlink: Window Types

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