fig73.m

realize analysis and design for computer-controlled system

% Generates Fig 7.3
% Computer Controlled Systems (3rd ed)
% Author: B. Wittenmark
% Last edit: 1997-07-05
% Copyright (c) 1996 by K. J. 舠tr鰉, B. Wittenmark and
% Department of Automatic Control, Lund Institute of
% Technology, Lund, Sweden

newplot;
set(gcf,'PaperUnits','centimeters','PaperPosition',[2 2 13 10])
set(gcf,'Units','centimeters','position',get(gcf,'PaperPosition'))
lw=0.9;

h=1;
eps=0.001;
n=500;
dt=30/n;
imp=zeros(1,n+1);
t=zeros(1,n+1);
for i=1:n+1
  t(i)=-15+dt*(i-1);
  if abs(pi*t(i)/h)<eps imp(i)=1; else imp(i)=sin(pi*t(i)/h)/(pi*t(i)/h);
end;  end;
%
clf;
subplot(3,1,1);
plot(t,imp,'k-','Linew',lw)
%title(['Fig 7.3 Shannon reconstruction']);
axis([-15,15,-0.4,1.2]);
set(gca,'Fontsize',9,'Fontname','NewCenturySchlbk');
set(gca,'xtick',[-10 0 10]);
set(gca,'ytick',[0 1]);
xlabel('Time','Fontsize',9,'Fontname','NewCenturySchlbk');