典型連續(xù)信號和離散信號時域波形圖

1、.一典型連續(xù)信號和離散信號的時域波形。1單邊指數(shù)信號；2單位沖激信號；3單位階躍信號；4矩形脈沖信號；5正弦信號；6單位序列； 7單位階躍序列；8單位矩形序列；9指數(shù)序列；10正弦序列。.單邊指數(shù)信號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( 單邊指數(shù)信號) 單位沖激信號function chongji(t1,t2,t0)dt=0.01;t1=10;t2=-5;t=t1:dt:

2、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(單位沖激信號)單位階躍信號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 offti

3、tle(單位階躍信號y(t)axis(t1,t2,-0.2,1.5)矩形脈沖信號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(矩形脈沖信號)axis(t1,t2,0,4);正弦信號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);p

4、lot(t,f)title(正弦信號)xlabel(t)ylabel(y(t)單位序列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(單位沖序列)單位階躍序列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

5、,nn);stem(kk,uu,filled)hold onstem(k,u,filled)hold offtitle(單位階躍序列)axis(k1,k2,0,1.5)單位矩形序列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(單位矩形序列)指數(shù)序列function dszsu(c,a,k1,k2)%c: 指數(shù)序列的幅度%a: 指數(shù)序列的底數(shù)%k1: 繪制序列的起始序號%k2: 繪制序列的終止序號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(指數(shù)序列)xlabel(n)ylabel(f(n)正弦序列function zxxulie(A,w,k1,k2)k1=-30;k2=