信号的产生与运算Word格式.docx
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50);
y=sin(2*pi*50*t);
plot(t(1:
50),y(1:
50))
title('
正弦波袁瑞'
)
s=y+randn(size(t));
50),s(1:
随机噪声波正弦波袁瑞'
clearall;
6*pi);
x=square(t,30);
%30为矩形波的占空系数
plot(t,x)
axis([06*pi-11.1])
周期方波袁瑞'
2.5);
y=sawtooth(2*pi*30*t);
plot(t,y);
axis([00.2-11])
周期锯齿波袁瑞'
x=linspace(-5,5);
y=sinc(x);
plot(x,y)
sinc函数袁瑞'
x=linspace(0,4*pi,300);
y1=diric(x,7);
y2=diric(x,8);
subplot(121)
plot(x,y1)
subplot(122)
plot(x,y2)
Dirichlet函数袁瑞'
functionf=Heaviside(t)
f=(t>
0)
%f(t)=(1+t/2)*[u(t+2)-u(t-2)]
%用malab求f(t+2),f(t-2),f(-t),f(2t),-f(t),并在同一图中绘出其时域波形。
clear;
symst
f=sym('
(t/2+1)*(Heaviside(t+2)-Heaviside(t-2))'
subplot(2,3,1),ezplot(f,[-3,3])
袁瑞f(t)'
y1=subs(f,t,t+2)
subplot(2,3,2),ezplot(y1,[-5,1])
袁瑞f(t+2)'
y2=subs(f,t,t-2)
subplot(2,3,3),ezplot(y2,[-1,5])
袁瑞f(t-2)'
y3=subs(f,t,-t)
subplot(2,3,4),ezplot(y3,[-3,3])
袁瑞f(-t)'
y4=subs(f,t,2*t)
subplot(2,3,5),ezplot(y4,[-2,2])
袁瑞f(2t)'
y5=-f
subplot(2,3,6),ezplot(y5,[-3,3])
袁瑞-f(t)'
2*Heaviside(t)-1'
);
ezplot(f,[-3,3]);
袁瑞sgn(t)'
cos(pi*t)*(Heaviside(t)-Heaviside(t-1))'
ezplot(f,[-10,10])
袁瑞cos(pi*t)*[u(t)-u(t-1)]'