... den=[1 -0.7]; h=tf(num,den)Transfer function:- .ss 0 7b. Đáp ứng tần số biên độ. Code:[h w]=freqz([1],[1 -0.7],1024); phi= 180 *unwrap(angle(h))/pi; subplot(2,1,1),plot(w,abs(h)),grid;xlabel('Frequancy(radian)'),ylabel('Magnitude');d.x(n)=δ(n-3)h(n)=0,7nu(n).code:h=[1 ... subplot(2,1,1),plot(w,abs(h)),grid;xlabel('Frequancy(radian)'),ylabel('Magnitude');d.x(n)=δ(n-3)h(n)=0,7nu(n).code:h=[1 0.7 0.49 0.343 0.2401 0.1 680 7 0.1176 0. 082 0.0576 0.04 0.0 28] ;subplot(2,1,2);stem(0:10,h);xlabel('n'),ylabel('h(n)');x=[0...