5.3

fs = 256000;
figure(1)%eliptyczny
[b,a] = ellip(4,3,40,0.5);
H=freqz(b,a,fs);
Hm=abs(H); HmdB=20*log10(Hm);
plot(HmdB,'k'); grid; title('filtr eliptyczny'); xlabel('w [Hz]');

figure(2)%butterwortha
[b,a] = butter(4,0.5);
H=freqz(b,a,fs);
Hm=abs(H); HmdB=20*log10(Hm);
plot(HmdB,'k'); grid; title('filtr butterwortha'); xlabel('w [Hz]');

figure(3)%czebyszewa1
[b,a] = cheby1(4,3,0.5);
H=freqz(b,a,fs);
Hm=abs(H); HmdB=20*log10(Hm);
plot(HmdB,'k'); grid; title('filtr czebyszewa 1'); xlabel('w [Hz]');

figure(4)%czebyszewa2
[b,a] = cheby2(4,3,0.5);
H=freqz(b,a,fs);
Hm=abs(H); HmdB=20*log10(Hm);
plot(HmdB,'k'); grid; title('filtr czebyszewa 2'); xlabel('w [Hz]');