信号与系统实验指导——————matlab

1、y=cos(2clear,close all,dt = 0.01;t = -2:dt:2;x = sin(2*pi*t);plot(t.x)% clear all variables% close all figure windows% specify the step of time variable% specify the interval of time% generate the signal% open a figure window and draw the plot of x(t)titlecinusoidal signal x(t)1) xlabel(time t (sec)

2、*)t function y = delta(t)dt = o.ol;y = (u(t)-u(t-dt)/dt;产生单位阶跃信号的扩展函数为：% unit step function function y = u(t)y = (t>=0);% y = 1 for t > 0, else y = 0rriezzwnrw1匚100so90807060a40302010£-6-202810y=sin(2t)sinusoidal signal x(t)time t (sec)figure 1-inlxifile edit view insert tools desktop win

3、dow helpdhsd0 bqsinusoidal signal x(t)time t (sec)y=2sin(2t)ij figure 1-ln| x|file edit view insert tools desktop window help、 01 qsinusoidal signal x(t)jnlxi> figure 1fie edit view insert tools desktop wndow helpldgsss fe 致q甥® f 00 agy=sa(t/t) i."figure 1file edi view hsert tools deskt

4、op wndow helpmbsinusoidal signal x(t)3.93.83.73.63.4000.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9time t (sec) 1 1 1 1 1 1 13.533y=4sa(t/t)3-1time t (sec).r cc7” fc2 culo figure 1-ln| xifile edit view insert tools desktop window helpmmmmmbd致毘 s sinusoidal signal x(t)4-3 5-1 t =-2:0.001:2 f= 2*exp( (j * (pi/4) *

5、t); subpl ot(2,2, l),plot(t,f); subplot(2?2,2),plot(tjeal(f);subplot(2,2,3),plot(t4mag(f)； subplot(2,2,4),plot(t,abs(f);fie ectt vtew insert toots desttop iwidow he<3%dq口昌n致耀 s n22210-505106t =-20:0.001:20 f= 2* exp(-1 +j * 10)* t);subplot(2,2,2),plot(tjeal(f);subplot(2,2,3),plot(t,imag(f)；subplo

6、t(224),plot(t,abs(f);on;axis(卜 3,3，3、3)(=5:0.001:5; x=square(4*t,75);plot(t,x);grid mm 10=5:0.001:5; x=tripuls(t,2,0); plot(t,x);gridon;axis(卜 3,3,3,3)3 58 microsoft word文件宅）觸© ffls©献2佝'主和匕切小丿 figure 1©2 g 24680sru3 rzoqs k qqo© < d0 q24/24 - srifi<m$2車击要锻砺目jlt=-5:0.001:5;x 二 tripuls (t,2)； plot (t,x); grid on; axis (-3,3,-3,3)a)目 triplustt.o)2jt=-5:0.001:5;x=squtft(4»t,75); plot (tzx); grid on; ixi $(-3,3,-3,3)101-5:0.001:5/咖规,2,腳p<u),gn 地翅卩,33,3)*<)t0.00t5;x“qum(30 也 75); plot st); grid on; axis (ho jo,-10.