FIR Digital Filter Design using Kaiser Window in MATLAB
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This section covers MATLAB source code for designing FIR low pass and high pass filters using the Kaiser window method.
FIR Low Pass Filter MATLAB Code
clc;
clear all;
close all;
format long;
rp=input('enter the passband ripple:(default:0.02)');
rs=input('enter the stopband ripple:(default:0.01)');
fp=input('enter the passband frequency:(default:1000)');
fs=input('enter the stopband frequency:(default:1500)');
f=input('enter the sampling frequency:(default:10000)');
beta=input('enter the beta value:(default:5.8)');
wp=2*(fp/f);
ws=2*(fs/f);
num=-20*log10(sqrt(rp*rs))-13;
dem=14.6*(fs-fp)/f;
n=ceil(num/dem);
n1=n+1;
if(rem(n,2)~=0)
n1=n;
n=n-1;
end;
y=kaiser(n1,beta);
%Lowpass filter
b=fir1(n,wp,y);
[h,o]=freqz(b,1,256);
m=20*log10(abs(h));
subplot(2,1,1);
plot(o/pi,m);
ylabel('gain in db---->');
xlabel('Normalised frequency---->');
title('FIR filter using Kaiser window of LPF ----');
%grid on;
## FIR High Pass Filter MATLAB Code
```matlab
%Highpass filter
b=fir1(n,wp,'high',y);
[h,o]=freqz(b,1,256);
m=20*log10(abs(h));
subplot(2,1,2);
plot(o/pi,m);
ylabel('gain in db---->');
xlabel('Normalised frequency---->');
title('FIR filter using Kaiser window of HPF ----');
%grid on;Output Plot
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