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신호처리 | 주파수 응답 |

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작성자 cemtool 작성일14-04-23 18:03 조회12,638회 댓글1건

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임펄스 응답이 이다. 주파수 응답을 구하고 그려보자.

ex7_3.cem
% Chapter 7: Example 7.3 Amplitude vs Magnitude response%h = [1,1,1];
w = [0:500]*pi/500;
H = freqz(h,1,w);
magH = abs(H); phaH = angle(H);
ampH = ones(1,501)+2*cos(w); angH = -w;
subplot(1,1,1)
subplot(2,2,1); 
plot(w/pi,magH); title("Magnitude Response");
xlabel("frequency in pi units"); ylabel("|H|"); grid on;
axis([0 1 -1.5 3.5]);
%set(gca,'XTickMode','manual','XTick',[0;0.6667;1])%set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'2/3';' 1 '])%set(gca,'YTickMode','manual','YTick',[0])
subplot(2,2,3); 
plot(w/pi,phaH/pi); title("Piecewise Linear Phase Response");
xlabel("frequency in pi units"); ylabel("angle in pi units"); grid on;
axis([0 1 -1 1])%set(gca,'XTickMode','manual','XTick',[0;0.6667;1])%set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'2/3';' 1 '])%set(gca,'YTickMode','manual','YTick',[-0.6667;0;0.3333])%set(gca,'YTickLabelMode','manual','YTickLabels',['-2/3';'   0';' 2/3'])
subplot(2,2,2); 
plot(w/pi,ampH); title("Amplitude Response");
xlabel("frequency in pi units"); ylabel("Hr"); grid on;
axis([0 1 -1.5 3.5])%set(gca,'XTickMode','manual','XTick',[0;0.6667;1])%set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'2/3';' 1 '])%set(gca,'YTickMode','manual','YTick',[0])
subplot(2,2,4); 
plot(w/pi,angH/pi); title("Linear Phase Response");
xlabel("frequency in pi units"); ylabel("angle in pi units"); grid on;
axis([0 1 -1 1])%set(gca,'XTickMode','manual','XTick',[0;0.6667;1])%set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'2/3';' 1 '])%set(gca,'YTickMode','manual','YTick',[-0.6667;0])%set(gca,'YTickLabelMode','manual','YTickLabels',['-2/3';'   0'])


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