FlatTop Routines

Summary

Flat-top window.

Declaration

Function FlatTop(Src: TVec; WindowMode: TSignalWindowMode): TVec;

Declaration

Function FlatTop(Src: TVec; WindowMode: TSignalWindowMode; Index: integer; Len: integer): TVec;

Description

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