DSP EXP 7

EXP NO 7

TITLE: DESIGN BUTTERWORTH FILTER USING METHOD FOR LPF AND WRITE A PROGRAM TO DRAW FREQUENCY RESPONSE OF BILINEAR TRANSFER FUNCTION

clc;

clear all;

close all;

Rp=input('Enter the passband ripple');

Rs=input('Enter the stopband ripple');

Wp=input('Enter the papassband h frequency band ripple');

Ws=input('Enter the stopband h frequency band ripple');

T=0.1;

[n,Wn] = buttord(Wp,Ws,Rp,Rs);

disp('Value of n and Wn');

disp([n,Wn])

disp('Value of Wc');

wc=(2/T)*tan(Wn*3.14/2);

disp(wc)

[b,a]=butter(n,wc,'s');

disp([b,a])

[b1,a1]=bilinear(b,a,1/T);

disp([b1,a1])

fvtool(b1,a1)

%Enter the passband ripple4.46

%Enter the stopband ripple20

%Enter the papassband h frequency band ripple0.35

%Enter the stopband h frequency band ripple0.7