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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 the
is 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)
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