The function cheb2ord() is used to find the filter order and center frequency and cheby2() is used to find the filter coefficients.A low pass filter is implimented.
% Program to design IIR Chebyschev type - II filter
clear all;
close all;
fp=input('Enter the pass band frequency fp = ');
fs=input('Enter the stop band frequency fs = ');
rp=input('Enter the pass band attenuation rp = ');
rs=input('Enter the stop band attenuation rs = ');
f=input ('Enter the sampling frequency f = ');
wp=2*fp/f;
ws=2*fs/f;
[n,wn]=cheb2ord(wp,ws,rp,rs);
[b,a]=cheby2(n,rs,wn,'low');
freqz(b,a,500,f);
TITLE ('Magnitude and phase respose of the IIR Chebyschev type - II filter');
%output
%Enter the pass band frequency fp = 1000
%Enter the stop band frequency fs = 1200
%Enter the pass band attenuation rp = .2
%Enter the stop band attenuation rs = 45
%Enter the sampling frequency f = 3000
% Program to design IIR Chebyschev type - II filter
clear all;
close all;
fp=input('Enter the pass band frequency fp = ');
fs=input('Enter the stop band frequency fs = ');
rp=input('Enter the pass band attenuation rp = ');
rs=input('Enter the stop band attenuation rs = ');
f=input ('Enter the sampling frequency f = ');
wp=2*fp/f;
ws=2*fs/f;
[n,wn]=cheb2ord(wp,ws,rp,rs);
[b,a]=cheby2(n,rs,wn,'low');
freqz(b,a,500,f);
TITLE ('Magnitude and phase respose of the IIR Chebyschev type - II filter');
%output
%Enter the pass band frequency fp = 1000
%Enter the stop band frequency fs = 1200
%Enter the pass band attenuation rp = .2
%Enter the stop band attenuation rs = 45
%Enter the sampling frequency f = 3000
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