信号的产生与运算.docx
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信号的产生与运算
Y=1/(5+4cosx)
Y=3sin(x)
Y=5exp(-x)
Y=sin(x)/x
t=(0:
0.001:
50);
y=sin(2*pi*50*t);
plot(t(1:
50),y(1:
50))
title('正弦波袁瑞')
t=(0:
0.001:
50);
y=sin(2*pi*50*t);
s=y+randn(size(t));
plot(t(1:
50),s(1:
50))
title('随机噪声波正弦波袁瑞')
clearall;
t=(0:
0.001:
6*pi);
x=square(t,30);%30为矩形波的占空系数
plot(t,x)
axis([06*pi-11.1])
title('周期方波袁瑞')
t=(0:
0.001:
2.5);
y=sawtooth(2*pi*30*t);
plot(t,y);
axis([00.2-11])
title('周期锯齿波袁瑞')
x=linspace(-5,5);
y=sinc(x);
plot(x,y)
title('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)
title('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])
title('袁瑞f(t)')
y1=subs(f,t,t+2)
subplot(2,3,2),ezplot(y1,[-5,1])
title('袁瑞f(t+2)')
y2=subs(f,t,t-2)
subplot(2,3,3),ezplot(y2,[-1,5])
title('袁瑞f(t-2)')
y3=subs(f,t,-t)
subplot(2,3,4),ezplot(y3,[-3,3])
title('袁瑞f(-t)')
y4=subs(f,t,2*t)
subplot(2,3,5),ezplot(y4,[-2,2])
title('袁瑞f(2t)')
y5=-f
subplot(2,3,6),ezplot(y5,[-3,3])
title('袁瑞-f(t)')
clear;
symst
f=sym('2*Heaviside(t)-1');
ezplot(f,[-3,3]);
title('袁瑞sgn(t)')
clear;
symst
f=sym('cos(pi*t)*(Heaviside(t)-Heaviside(t-1))');
ezplot(f,[-10,10])
title('袁瑞cos(pi*t)*[u(t)-u(t-1)]')