北京理工大学信号与系统实验报告

3210-1-2-30123456

(4)、已知信号x1(t)?4?t,(0?t?4)，及信号错误！未找到引用源。,用MATLAB绘出下列信号的波形

1、

x3(t)?x1(t)?x2(t)

>> t=-5:0.001:5;

>> x1=(4-t).*heaviside(t); >> x2=sin(2*pi*t); >> x3=x1+x2; >> plot(t,x3)

543210-1-2-5-4-3-2-1012345

2、x4(t)?x1(t)?x2(t) >> t=0:0.001:5; >> x1=0:4; >> x1=4-t;

>> x2=sin(2*pi*t); >> x4=x1.*x2; >> plot(t,x4)

43210-1-2-3-400.511.522.533.544.55

3、

x5(t)?x1(?t)?x1(t)

>> t=0:0.001:5; >> x1=0:4; >> x1=4-t; >> x2=-4:0; >> x2=4+t; >> x5=x1+x2; >> plot(t,x5)

88888800.511.522.533.544.55

4、

x6(t)?x2(t)?x3(t?1)

>> t=0:0.001:5; >> x1=4-t;

>> x2=sin(2*pi*t); >> x3=x1+x2;

>> x7=x3.*heaviside(t-1); >> x6=x2.*x7; >> plot(t,x6)