Digital Signal Processing Reference
In-Depth Information
(
a
)
(
b
)
FIGURE 4.19.
Output frequency responses obtained with an HP analyzer using program
FIRPRN.c
:(
a
) FIR filter with two passbands; (
b
) FIR filter with four passbands.
the coefficient file
pass2b.cof.
Figure 4.19
b
shows the frequency response of an FIR
filter with four passbands using the coefficients file
pass4b.cof.
These plots were
obtained with the HP 3561A signal analyzer. An example of a comb filter is
described by
y(n) = 1/8[x(n)-x(n-8)]
having eight zeros, and a frequency
response with four notches at
p
/4,
p
/2, 3
p
/4, and
p
/8.
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