
Compensation of undesired
phase response in a filter is
known as
equalization.
This is
unrelated to the
equalization
pulses that form part of sync.
The terms
nonrecursive
and
recur-
sive
are best used to describe filter
implementation structures.
OUT
Figure 16.22 IIR ("recursive") filter computes a weighted
sum of input samples (here, just 1/4 times the current sample),
and adds to this a weighted sum of previous result samples.
Every IIR filter exhibits nonlinear phase response.
In an IIR filter having
just
one tap, the designer's ability
to tailor frequency response is severely limited. An I IR
filter ...