signals1.m

this file consists of many matlab programs

% Butterworth Low Pass Filter

clc;
clear all;
close all;

f1 = input ('Enter the pass band freq : ');
f2 = input ('Enter the stop band freq : ');
fs = input ('Enter the sampling freq : ');

k1 = input ('Enter the pass band attn. : ');
k2 = input ('Enter the stop band attn. : ');

w1 =  2 * f1/fs;
w2 =  2 * f2/fs;

[n,wn] = buttord (w1,w2,k1,k2);
[b,a] = butter(n,wn);

figure ;
subplot (4,2,1);
freqz(b,a);
title ('Butter Worth LPF');