신호 에 대해, 로 샘플링된 샘플 으로부터 를 복원하고, 결과를 살펴보자.

ex3_21.cem

% Discrete-time Signal x1(n)
Ts = 0.0002; Fs = 1/Ts; n = -25:25:1; nTs = n*Ts;
x = exp(-1000*abs(nTs));
% Analog Signal reconstruction
Dt = 0.00005;
t = -0.005:0.005:Dt;
xa = x * sinc(Fs*(ones(length(nTs),1)*t-nTs'*ones(1,length(t))));
% check
error = max(abs(xa - exp(-1000*abs(t))))
% Plots
subplot(1,1,1)subplot(2,1,2);plot(t*1000,xa);
xtitle("t in msec."); ytitle("xa(t)")title("Reconstructed Signal from x1(n) using sinc function"); 
holdon
stem(n*Ts*1000,x,"-"); holdoff