figure_2_19.m

数字信号处理—基于计算机的方法教材上的所有例题源程序

% for example 2.9 P49
N = 80;
n = 0:N;
x1 = sin(0.05*pi*n);
x2 = sin(0.15*pi*n);
x3 = sin(0.25*pi*n);
x  = x1 + x2/3 + x3/5;
subplot(221),stem(n,x1);ylabel('x1');
subplot(222),stem(n,x2);ylabel('x2');
subplot(223),stem(n,x3);ylabel('x3');
subplot(224),stem(n,x); ylabel('x');