典型连续信号和离散信号时域波形图.doc

一典型连续信号和离散信号的时域波形。1单边指数信号；2单位冲激信号；3单位阶跃信号；4矩形脉冲信号；5正弦信号；6单位序列； 7单位阶跃序列；8单位矩形序列；9指数序列；10正弦序列。典型连续信号和离散信号时域波形图单边指数信号function zhishu(A,a,t1,t2,dt) t1=0t2=10A=1A=-0.4dt=0.01t=t1:dt:t2;y=A*exp(a*t);plot(t,y)axis(t1,t2,0,1.2)xlabel(t)ylabel(y(t)title( 单边指数信号) 单位冲激信号function chongji(t1,t2,t0)dt=0.01;t1=10;t2=-5;t=t1:dt:t2;n=length(t);x=zeros(1,n);x(1,(-t0-t1)/dt+1)=1/dt;stairs(t,x);axis(t1,t2,0,1.2/dt)xlabel(t)ylabel(y(t)title(单位冲激信号)单位阶跃信号function jieyao(t1,t2,t0)t1=0;t2=10;t0=-4t=t1:0.01:-t0;tt=-t0:0.01:t2;n=length(t);nn=length(tt);u=zeros(1,n);uu=ones(1,nn);plot(tt,uu)hold onplot(t,u)plot(-t0,-t0,0,1)hold offtitle(单位阶跃信号y(t)axis(t1,t2,-0.2,1.5)矩形脉冲信号function jxmcxh(A,width,T1,T2,dt,T0)A=3;width=2;T1=-3;T2=3;T0=0;dt=0.01t=T1:dt:T2;ft=A*rectpuls(t-T0,width);plot(t,ft);xlabel(t)ylabel(y(t)title(矩形脉冲信号)axis(t1,t2,0,4);正弦信号function zhengxian(A,w,t1,t2,dt)A=5;w=0.5*pi;t1=0;t2=15;dt=0.01t=t1:dt:t2;f=A*sin(w*t);plot(t,f)title(正弦信号)xlabel(t)ylabel(y(t)单位序列function dwxulie(k1,k2,k0)k1=-8;k2=12;k0=-2;k=k1:k2;n=length(k);f=zeros(1,n);f(1,-k0-k1+1)=1;stem(k,f,filled)axis(k1,k2,0,1.5)title(单位冲序列)单位阶跃序列function jyxulie(k1,k2,k0)k1=-10;k2=10;k0=4;k=k1:-k0-1;kk=-k0:k2;n=length(k);nn=length(kk);u=zeros(1,n);uu=ones(1,nn);stem(kk,uu,filled)hold onstem(k,u,filled)hold offtitle(单位阶跃序列)axis(k1,k2,0,1.5)单位矩形序列function jyxulie(k1,k2,k0)k1=-8;k2=12;k0=1;axis(k1,k2,0,1.5);k=k1:-k0-1;kk=-k0:6;kkk=7:k2n=length(k);nn=length(kk);nnn=length(kkk);u=zeros(1,n);uu=ones(1,nn);uuu=zeros(1,nnn);stem(kk,uu,filled)hold onstem(k,u,filled)stem(kkk,uuu,filled)hold offtitle(单位矩形序列)指数序列function dszsu(c,a,k1,k2)%c: 指数序列的幅度%a: 指数序列的底数%k1: 绘制序列的起始序号%k2: 绘制序列的终止序号c=1;a=2;k1=-2;k2=10;k=k1:k2;x=c*(a.k);stem(k,x,filled)hold onplot(k1,k2,0,0)hold offtitle(指数序列)xlabel(n)ylabel(f(n)正弦序列function zxxulie(A,w,k1,k2)k1=-30;k2=30;a=2;w=0.25k=k1:k2;stem(k,A*sin(k*w),filled)title(离散时间正弦序列f(n)=Asin(wn)xlabel(n)ylabel(f(n)