Analog-to-Digital filter conversion

Matlab program for Analog-to-Digital filter conversion. This program convert Analog Domain signal to Digital domain. 

Matlab code

% Let Transfer function in Analog Domain is (s^2+2s+1)/(s^3+5s^2+11s+15)

clc; close all; clear all; b=[1,2,1];

a=[1,5,11,15];

fs=5; %Sampling frequency

[bz1, az1]=impinvar(b,a,fs); % Impulse invariance method

[bz2, az2]=impinvar(b,a,fs); % Bilinear transformation method

bz1 % Digital filter numerator coefficients for Impulse invariance method

az1 % Digital filterdenominator coefficients for Impulse invariance method

bz2 % Digital filter numerator coefficients for Bilinear transformation method

az2 % Digital filterdenominator coefficients for Bilinear transformation method

Command window

bz1 =

0.2000 -0.3130 0.1259

az1 =

1.0000 -2.0570 1.4980 -0.3679

bz2 =

0.2000 -0.3130 0.1259

az2 =

1.0000 -2.0570 1.4980 -0.3679