demoicon.m

数字通信第四版原书的例程

function [x1, y1, x2, y2] = demoicon
%output the input/iutput for the modulation icons.

%       Copyright (c) 1996 by The MathWorks, Inc.
%       $Revision: 1.1 $  $Date: 1996/04/01 19:38:21 $

x1 = [0:.075:10];
y1 = sin(x1*pi/5).*sin(x1*pi*2);
x2=[10:.5:20];
y1 = [y1 sin(x2*pi/5)];
x1 = [x1 x2];
y2 = [1 -1 -1 -1 -1.1 -.9 -1];
x2 = [10 10 0 20 18 18 20];
y1 = (y1+5)/6 * 100;
y2 = (y2+5)/6 * 100;
x1 = x1* 5;
x2 = x2* 5;
%plot(0, 0, x1, y1, x2, y2);