
85-21Filters
we obtain the following impulse response coecients:
h
h
h
h
h
( ) .
( ) .
( ) .
( ) .
( ) .
0 0 00748
1 0 12044
2 0 54729
3 0 27614
4 0
=
= −
=
= − 003722
(85.61)
85.7.2 Optimum FIR Filters
As mentioned earlier, one of the principal advantages of FIR lters over their IIR counterparts is the avail-
ability
of ex
cellent
de
sign
me
thods
fo
r
op
timizing
ar
bitrary
l
ter
sp
ecications
. Ge
nerally,
th
e
de
sign
cr
ite-
rion
fo
r
th
e
op
timum
so
lution
of an FIR l
ter
de
sign
pr
oblem
ca
n
be ch
aracterized
as fo
llows
. e ma
ximum
er
ror
be
tween
th
e
ap
proximating
re
sponse
an
d
th
e
gi
ven
de
sired
re
sponse
ha
s
to be mi
nimized,
i.e.,
E e W e H e H e
j T j T j T j T
( ) ( )