User manual

Code: ENIGMA III User Manual
Edition: 1 Revision: 4
Date: 19/12/2008
Page: 24/97
2.4.2.1 Windowing
To suppress sidelobes it is necessary to apply a tapering window to the data prior to the transformation
into the frequency domain.
Window functions generally have a maximum value centered on the time series and are tapered near zero
at the ends. This tapering reduces the spectrum smearing a leakage of spectral energy introduced by the
discontinuity imposed by sampling when the end points are joined.
The type of window function is chosen by the parameter FFTWindow.
FFTWindow
Possible values are:
0 – Rectangular
1 – Hamming
2 – Blackman
3 – Hann
4 – Welch
5 – Kaiser-Bessel
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