代码：

% Discrete-time Signal x2(n)

Ts = 0.001; n = -5:1:5; nTs = n*Ts; Fs = 1/Ts; x = exp(-1000*abs(nTs));

% Analog Signal

Dt = 0.00005; t = -0.005:Dt:0.005;

xa = x * sinc(Fs*(ones(length(n),1)*t - nTs'*ones(1,length(t)))) ;

% check

error = max(abs(xa - exp(-1000*abs(t))))

　　

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