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452 Chapter 8 IIR FILTER DESIGN
Lowpass Filter Magnitude Response
1
0.8913
0
1
Lowpass Filter Magnitude in dB
|H|
decibels
0
0 0.2 1
frequency in π units
30
0 0.2 1
frequency in π units
Highpass Filter Magnitude Response
1
0.8913
0
1
Highpass Filter Magnitude in dB
|H|
decibels
0
0 0.6 1
frequency in π units
30
0 0.6 1
frequency in π units
FIGURE 8.31 Magnitude response plots for Example 8.25
function [bz,az] = zmapping(bZ,aZ,Nz,Dz)
% Frequency band Transformation from Z-domain to z-domain
% -------------------------------------------------------
% [bz,az] = zmapping(bZ,aZ,Nz,Dz)
% performs:
% b(z) b(Z)|
% ---- = ----| N(z)
% a(z) a(Z)|@Z = ----
% D(z)
%
bNzord = (length(bZ)-1)*(length(Nz)-1);
aDzord = (length(aZ)-1)*(length(Dz)-1);
bzord = length(bZ)-1; azord = length(aZ)-1;
bz = zeros(1,bNzord+1);
for k = 0:bzord
pln = [1];
for l = 0:k-1
pln = conv(pln,Nz);
end
pld = [1];
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