Kaiser-Bessel FFT window
A Kaiser-Bessel window balances amplitude accuracy, side lobe distance, and side lobe height. Although similar to the Blackman-Harris
window, the near side lobes in a Kaiser- Bessel window tend to be higher for the same main lobe width, while the further-out side lobes are
lower. This window can reveal signals close to the noise floor, and analyze two tones with close frequencies but different amplitudes.
Rectangular window
This window is equal to unity (see the next figure). This means the data samples in the gate are not modified before input to the spectral
analyzer
. Rectangular windows are best for measuring transients or bursts where the signal levels before and after the event are nearly
equal.
Note: This window has the narrowest resolution bandwidth of any of the windows, but it also has the most spectral leakage and
the highest side lobes.
Measurement concepts
254
To Next Page
Loading...
