% Example 2.5 % % x(n)=[u(n)=u(n-10]; h(n)=(0.9)^n*u(n) % y(n)=10*(1-(0.9)^(n+1))*(u(n)-u(n-10))+ % (10*(1-(0.9)^10)*(0.9)^(n-9))*u(n-10) n = -5:50; u1 = stepseq(0,-5,50); u2=stepseq(10,-5,50); % input x(n) x = u1-u2; % impulse response h(n) h = ((0.9).^n).*u1; subplot(1,1,1) subplot(2,1,1); stem(n,x); axis([-5,50,0,2]) title('Input Sequence') xlabel('n'), ylabel('x(n)') subplot(2,1,2); stem(n,h); axis([-5,50,0,2]) title('Impulse Response') xlabel('n'), ylabel('h(n)'); pause print -deps2 ex0205a.eps % output response y = (10*(1-(0.9).^(n+1))).*(u1-u2)+(10*(1-(0.9)^10)*(0.9).^(n-9)).*u2; subplot(1,1,1) subplot(2,1,2); stem(n,y); axis([-5,50,0,8]) title('Output Sequence') xlabel('n'), ylabel('y(n)') print -deps2 ex0205b.eps
