Flat-top window.
function FlatTop(const Src: TVec; WindowMode: TSignalWindowMode): TVec; overload;
Applies Flat top window to Src. Window functions are applied to the signal prior to conversion to frequency domain with the FFT algorithm, to reduce the spectral leakage. Their side-effect is a lower frequency resolution. Flat top window was used to get more accurate amplitude information when frequency interpolation routines where not yet common.
w[i] = 0.2810639 - 0.5208972*cos(2*Pi*i/(n-1)) + 0.1980399*cos(4*Pi*i/(n-1)))
0 < i < n-1
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