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1、西南交通大学信号与系统实验报告班级____________学号____________姓名___________实验时间___年___月___日实验名称__________________________________________________________预习：操作：报告：总评：指导老师：一、实验预习内容1、实验目的：2、实验内容及实验函数说明：电气工程基础实验中心二、实验内容1.2t=-3:0.01:3;y=rectpuls(t,2);plot(t,y);axis([-5,5,-0.5,1
2、.5]);1.3t=-1:0.0001:1;y1=5*rectpuls(t,0.2);y2=10*rectpuls(t,0.1);plot(t,y1,t,y2)axis([-1,1,-1,12]);1.4（1）t=-3:0.01:3;y=5*cos(12*pi*t)+6*cos(18*pi*t);plot(t,y);axis([0,1,-9,11]);1.4（2）symst;y=cos(2*pi*t)*cos(2*pi*t);ezplot(y,[0,1]);axis([0,1,0,1]);波形部分4.2
3、t=0:0.001:6;a1=[156];a2=[125];a3=[121];b=[15];y1=step(b,a1,t);y2=step(b,a2,t);y3=step(b,a3,t);plot(t,y1,t,y2,'+',t,y3,'*');4.5a=[156];b=[28];[A,B,C,D]=tf2ss(b,a);sys=ss(A,B,C,D);t=0:0.01:5;f=zeros(1,length(t));x0=[0,-3];subplot(1,3,1);plot(t,y1);y1=lsim(
4、sys,f,t,x0);f=exp(-t);subplot(1,3,2);plot(t,y2);y2=lsim(sys,f,t);subplot(1,3,3);plot(t,y3);y3=lsim(sys,f,t,x0);5.3Ts=0.001;t=-1:Ts:5;f=(t>0)-(t>1);h=0.5*((t>1)-(t>3));y=conv(f,h)*Ts;L=length(y);k=(0:L-1)*Ts+1;subplot(2,1,2);plot(k,y);gridon;axis([0,10,0,
5、0.7]);%6.1symstTn;y1=4/T*t+1;y2=-4/T*t+1;a0=1/T*(int(y1,-T/2,0)+int(y2,0,T/2));y3=y1*cos(n*2*pi/T*t);y4=y2*cos(n*2*pi/T*t);an=2/T*(int(y3,-T/2,0)+int(y4,0,T/2));bn=0;an=zeros(50,1);cn=zeros(50,1);T=2*pi;an(1)=0;cn(1)=0;for(i=1:1:50)an(i+1)=-2*(-2+2*cos(i
6、*pi)+i*pi*sin(i*pi))/i^2/pi^2;cn(i+1)=abs(an(i+1));endsymsk;k=0:1:50;stem(k,cn);subplot(2,1,1);plot(k,cn);t=-5:0.01:5;f=sawtooth((t-pi),0.5);subplot(2,1,2);plot(t,f);1%7.3a=[0.080.41];b=[1];w=linspace(0,10,300);[h,w]=freqs(b,a,w);subplot(2,1,1);plot(w,ab
7、s(h));gridon;subplot(2,1,2);plot(w,angle(h));gridon;%7.1symst;f=exp(-2*abs(t));subplot(3,1,1)ezplot(f);y1=fourier(f);y=abs(y1);subplot(3,1,2);ezplot(y);im=imag(y1);re=real(y1);phase=atan(im/re);subplot(3,1,3);ezplot(phase);%7.2symstaowt;tao=1;F=(tao*sin(
8、w*tao/2/pi))/(w*tao/2);subplot(2,2,1);ezplot(F);f=ifourier(F,t);subplot(2,2,2);ezplot(f);title('f(t)');subplot(2,2,3);ezplot(abs(F));title('幅度频谱');im=imag(F);re=real(F);phase=atan(im/re);subplot(2,2,4);ezplot(phase);%9.4sy
