Chebyshev Type 2 Digital Band Pass Filter | Scigyan

Chebyshev Type 2 Digital Band Pass Filter

Matlab program to design Chebyshev Type 2 Digital Band Pass Filter.

Matlab code

clc; clear all; close all;
rp=input('Enter the Passband ripple (In db) = '); 
rs=input('Enter the Stopband attenuation (In db) = '); 
fpc=input('Enter the Passband corner frequency (In Hz) = '); 
fsc=input('Enter the Stopband corner frequency (In Hz) = '); 
fs=input('Enter the Sampling frequency (In Hz) = ');

fn=fs/2;
Wp=fpc/fn; % Normalized passband corner frequency 
Ws=fsc/fn; % Normalized stopband corner frequency 
n=cheb2ord(Wp,Ws,rp,rs);
Wn=[Wp,Ws];
[b,a]=cheby2(n,rs,Wn,'bandpass'); 
L=1024;
[h,w]=freqz(b,a,L);

wi=w/pi; % Normalized angular frequency vector
mag=20*log10(abs(h)); 
ang=angle(h);

subplot(2,1,1);
plot(wi,mag);
title('Magnitude Response [Chebyshev Type 2 Digital Band Pass Filter]'); 
ylabel('Gain in dB -->');
xlabel('Normalised Frequency ( x pi rad/sample)-->'); 
grid on;

subplot(2,1,2);
plot(wi,ang); 
title('Phase Response');
xlabel('Normalised Frequency ( x pi rad/sample)-->'); 
ylabel('Phase in radians -->');
grid on;

Command window

Enter the Passband ripple (In db) = .1
Enter the Stopband attenuation (In db) = 80
Enter the Passband corner frequency (In Hz) = 400
Enter the Stopband corner frequency (In Hz) = 600
Enter the Sampling frequency (In Hz) = 2000

Figure window

Chebyshev-Type-2-Digital-Band-Pass-Filter
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