Biomedical Engineering Reference
In-Depth Information
FIGURE 11.11
:
Symmetric IIR lattice digital filter
IIR filter also have a very narrow transition band, which would be desirable in
band-pass and band-reject filters as shown in Figs. 11.12 and 11.13, respectively.
11.2.3 Finite Impulse Response (FIR) Digital Filters
The Finite Impulse Response (FIR) filter maybe derived from the IIR transfer function
equation (11.11). If the denominator terms are unity,
A
(
z
)
=
1, the equation for
H
(
z
)
1.0
0.8
Passband
Transition
band
Transition
band
0.6
0.4
0.2
Stopband
Stopband
0
0
p
FIGURE 11.12
:
Band-pass filter. Note the narrow transition bands in the band-pass filter
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