final code for css

semestralka/IIR_SOS.m

@@ -0,0 +1,56 @@
+clc;
+close all;
+clear all;
+
+f0_ohranicene = [25, 20, 10, 12.5];
+rawText = fileread('data6.dat');
+nums = regexp(rawText, '[-+]?\d+', 'match');
+data = int16(str2double(nums));
+
+Fs = 200;
+r = 0.98;
+
+% predalokovana SOS matica pre vsetky filtrovane zlozky
+% 6 lebo koeficienty [b0, b1, b2, a0, a1, a2]
+sos = zeros(length(f0_ohranicene), 6);
+
+for k = 1:length(f0_ohranicene)
+    theta = 2 * pi * (f0_ohranicene(k) / Fs);
+    b = [1, -2*cos(theta), 1];
+    a = [1, -2*r*cos(theta), r^2];
+    sos(k, :) = [b, a]
+end
+
+figure;
+[z, p, k_gain] = sos2zp(sos);
+
+figure;
+zplane(z, p);
+title('Nuly a póly filtra');
+xlabel('Reálna časť');
+ylabel('Imaginárna časť');
+set(gcf, 'Color', 'none');
+set(gca, 'Color', 'none');
+print('-depsc', 'fig2_semE.eps');
+
+figure;
+freqz(sos, 4096, Fs);
+title('Frekvenčná charakteristika SOS filtra');
+xlabel('Frekvencia [Hz]');
+ylabel('Zosilnenie [dB]');
+set(gcf, 'Color', 'none');
+set(gca, 'Color', 'none');
+print('-depsc', 'fig3_semE.eps');
+
+filtered_data = sosfilt(sos, double(data));
+figure;
+plot(filtered_data);
+title('Filtrovaný signál');
+xlabel('Vzorky');
+ylabel('Amplitúda');
+grid on;
+set(gcf, 'Color', 'none');
+set(gca, 'Color', 'none');
+set(gcf, 'PaperPosition', [0 0 1.7*6 0.75*4.2]);
+set(gcf, 'PaperSize', [1.7*6 0.75*4.2]);
+print('-depsc', 'fig4_semE.eps');