LeCroy 9400A

Window Functions
All window functions implemented in the WP02 package belong to the sum
of cosines family with one to three non-zero cosine terms:
m=M-I
w = a * cos 0 _< k < N
k m N
!
m=O
where H=3
a
m
N
k
is the maximum number of terms
are the coefficients of the terms
points of theis the number of
waveform
is the time index
coefficients.
Table 11.2 lists the a
m
source
The window functions, seen in the time domain are symmetric about the
point k = N/2, (mid-screen on the 9400A) where they all have a peak
amplitude of 1.0.
Table 11.2 Coefficients of window functions
Window type
a
0
a
I
a
2
Rectangular 1.0 0.0 0.0
yon Hann
0.5 -0.5 0.0
Hamming 0.54 -0.46 0.0
Flat-Top 0.281 -0.521 0.198
Blackman-Harris 0.423
-0.497 0.079
11-20
Fast Fourier Waveform Processing
Option (WP02, V 2.06FT)