(m) ¶(m, "periodic") ¶(m, "symmetric") ¶Return the filter coefficients of a Flat Top window of length m. The Flat Top window is defined by the function f(w):
f(w) = 1 - 1.93 cos(2 pi w) + 1.29 cos(4 pi w)
- 0.388 cos(6 pi w) + 0.0322cos(8 pi w)
where w = i/(m-1) for i=0:m-1 for a symmetric window, or w = i/m for i=0:m-1 for a periodic window. The default is symmetric. The returned window is normalized to a peak of 1 at w = 0.5.
This window has low pass-band ripple, but high bandwidth.
According to [1]:
The main use for the Flat Top window is for calibration, due to its negligible amplitude errors.
[1] Gade, S; Herlufsen, H; (1987) "Use of weighting functions in DFT/FFT analysis (Part I)", Bruel & Kjaer Technical Review No.3.
Package: signal