ex032100.m

DSP with Matlab by Proakis and Ingle

% Chapter 3 : Example 3.21

%             Reconstruction using the stairs and plot functions

%

figure(1); clf

% Discrete-time Signal x1(n) : Ts = 0.0002

Ts = 0.0002; n = -25:1:25; nTs = n*Ts;

x = exp(-1000*abs(nTs));

% Analog Signal reconstruction using stairs

subplot(2,1,1); stairs(nTs*1000,x);

xlabel('t in msec.'); ylabel('xa(t)')

title('Reconstructed Signal from x1(n) using zero-order-hold'); hold on

stem(n*Ts*1000,x); hold off

%

% Analog Signal reconstruction using plot

subplot(2,1,2); plot(nTs*1000,x);

xlabel('t in msec.'); ylabel('xa(t)')

title('Reconstructed Signal from x1(n) using first-order-hold'); hold on

stem(n*Ts*1000,x); hold off