kombinasi filter LPF dan BPF menggunakan matlab untuk meloloskan frekuensi tertentu

1. Mafatikhul Ilmi - 1203121023
%sinyal masukan domain waktu
clc;clear all
Fs=8000;
t=0:1/Fs:5*1/800;
x=sin(2*pi*800*t)+sin(2*pi*1200*t)+s
in(2*pi*1500*t)+...
sin(2*pi*1800*t)+sin(2*pi*2200*t);
%subplot(221);
figure(1)
plot(t,x)
title('Input Sinyal Domain Waktu')
%sinyal masukan domain frekuensi
X=fft(x,1024);
frek=((0:511)/512)*Fs/2;
%subplot(222);
figure(2)
plot(frek,abs(X(1:512)));
title('Input Sinyal Domain
Frekuensi')
%--Merancang filter LPF lolos 800Hz-
-%
wc=2*pi*850/Fs;
wr=2*pi*900/Fs;
N=8*pi/(wr-wc);
N=ceil(N);
if mod(N,2)==0;
N=N+1;
end
alpha=(N+1)/2;
whamm=hamming(N);
n=0:N-1;
h=sinc(n-alpha)-wc/pi*sinc(wc/pi*(n-
alpha));
hd=h.*transpose(whamm);
%Keluaran filter LPF
y=filter(hd,1,x);
Y=fft(y,1024);
%plot(frek,abs(Y(1:512)));
%--Merancang filter BPF lolos 1500
dan 1800 Hz--%
wc1=2*pi*1490/Fs;
wr1=2*pi*1430/Fs;
wc2=2*pi*1810/Fs;
wr2=2*pi*1870/Fs;
N1=8*pi/(wr2-wc2);
N1=ceil(N1);
if mod(N1,2)==0;
N1=N1+1;
end
alpha1=(N1+1)/2;
whamm1=hamming(N1);
n1=0:N1-1;
h1=wc2/pi*sinc(wc2/pi*(n1-alpha1))-
wc1/pi*sinc(wc1/pi*(n1-alpha1));
hd1=h1.*transpose(whamm1);
%Keluaran filter BPF
y1=filter(hd1,1,x);
Y1=fft(y1,1024);
%plot(t,y1) --> plot domain waktu
%plot(frek,abs(Y1(1:512))); plot
domain frekuensi
%output filter
out_time=y+y1;
out_frek=fft(out_time,1024);
%plot domain waktu
%subplot(223)
figure(3)
plot(t,out_time);
title('Output Filter Domain Waktu')
%plot domain frekuensi
%subplot(224)
figure(4)
plot(frek,abs(out_frek(1:512)));
title('Output Filter Domain
Frekuensi')

2. Mafatikhul Ilmi - 1203121023
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Input Sinyal Domain Waktu
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Input Sinyal Domain Frekuensi
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Output Filter Domain Waktu
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Output Filter Domain Frekuensi