FIR Band Pass Filter - Remez Algorithm Based

This program is used to design FIR Symmetric Band pass Filter using Remez algorithm. In scilab this has been implemented by using the inbuilt command eqfir().

//Low Pass FIlter of length M = 11
//Pass band Edge frequency fp = 0.1 and a Stop edge frequency fs = 0.15
// Choose the number of cosine functions and create a dense grid 
// in [0,0.2) and [0.25,0.5)
//magnitude for pass band = 1 & stop band = 0 (i.e) [1 0]
//Weighting function =[1 1]
clear all;
clc;
close;
M =11;
hn=eqfir(11,[0,0.2;0.25,0.5],[1 0],[1 1]);
[hm,fr]=frmag(hn,256);
disp(hn,'The Filter Coefficients are:')
figure
plot(.5*(0:255)/256,20*log10(frmag(hn,256)));
xlabel('Normalized Digital Frequency fr');
ylabel('Magnitude in dB');
title('Frequency Response of FIR LPF using REMEZ algorithm M=11')
xgrid(2)