?? ex050500.m
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% Chapter 05: Example 05.05: Frequency-domain sampling%% x(n)=(0.7)^n * u(n)% X(z)=z/(z-0.7); |z|>0.7subplot(1,1,1)%N = 5;k = 0:1:N-1;wk = 2*pi*k/N;zk = exp(j*wk);Xk = (zk)./(zk-0.7);xn = real(idfs(Xk,N));xtilde = xn'* ones(1,8); xtilde = (xtilde(:))';subplot(2,2,1); stem(0:39,xtilde);axis([0,40,-0.1,1.5])xlabel('n'); ylabel('xtilde(n)'); title('N=5')%N = 10;k = 0:1:N-1;wk = 2*pi*k/N;zk = exp(j*wk);xn = real(idfs(Xk,N));xtilde = xn'* ones(1,4); xtilde = (xtilde(:))';subplot(2,2,2); stem(0:39,xtilde);axis([0,40,-0.1,1.5])xlabel('n'); ylabel('xtilde(n)'); title('N=10')%N = 20;k = 0:1:N-1;wk = 2*pi*k/N;zk = exp(j*wk);Xk = (zk)./(zk-0.7);xn = real(idfs(Xk,N));xtilde = xn'* ones(1,2); xtilde = (xtilde(:))';subplot(2,2,3); stem(0:39,xtilde);axis([0,40,-0.1,1.5])xlabel('n'); ylabel('xtilde(n)'); title('N=20')%N = 40;k = 0:1:N-1;wk = 2*pi*k/N;zk = exp(j*wk);Xk = (zk)./(zk-0.7);xn = real(idfs(Xk,N));subplot(2,2,4); stem(0:39,xn);axis([0,40,-0.1,1.5])xlabel('n'); ylabel('xtilde(n)'); title('N=40')?? 快捷鍵說明
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