matlab1.docx

長江大學(xué)電工電子實(shí)驗(yàn)中心實(shí)驗(yàn)報告信號與系統(tǒng)實(shí)驗(yàn)報告（1）連續(xù)信號的運(yùn)算實(shí)驗(yàn)?zāi)康?掌握用Matlab繪制波形圖的方法，學(xué)會常見波形的繪制2掌握用Matlab編寫函數(shù)的方法3周期信號與非周期信號的觀察。加深對周期信號的理解實(shí)驗(yàn)內(nèi)容1、用MATLAB畫出下列信號的波形。 (a) ; (b) ; (c) ; (d) ; (e) ; (f) 解：（1）程序t=linspace(-10,10,400);f1=heaviside(cos(t);figure(1),plot(t,f1,linewidth,2);axis(-10 10 -0.2 1.2)xlabel(Time(sec),ylabel(f1(t),title(a)t=linspace(-4,4,400);f2=abs(t)/2.*(heaviside(t+2)-heaviside(t-2);figure(2),plot(t,f2,linewidth,2);axis(-4 4 -0.2 1.2)xlabel(Time(sec),ylabel(f2(t),title(b)t=linspace(-1,3,400);f3=sin(pi*t).*(heaviside(-t)-heaviside(2-t);figure(3),plot(t,f3,linewidth,2);axis(-1 3 -1.2 1.2)xlabel(Time(sec),ylabel(f3(t),title(c) t=linspace(-2,2,400);f4=sign(t).*rectpuls(t,2);figure(4),plot(t,f4,linewidth,2);axis(-2 2 -1.2 1.2)xlabel(Time(sec),ylabel(f4(t),title(d) t=linspace(-1,4,400);f5=rectpuls(t,6).*tripuls(t-2,4);figure(5),plot(t,f5,linewidth,2);axis(-1 4 -0.2 1.2)xlabel(Time(sec),ylabel(f1(t),title(e) t=linspace(-3,3,400);f6=heaviside(2-abs(t).*sin(pi*t);figure(6),plot(t,f6,linewidth,2);axis(-3 3 -1.2 1.2)xlabel(Time(sec),ylabel(f1(t),title(f)（2）波形2、用基本信號畫出圖2.1-10中的信號。圖2.1-10解：（1）程序t=linspace(-1,7,400); f1=2*rectpuls(t-3,6)+2*rectpuls(t-3,2);figure(1),line(t,f1,linewidth,2);axis(-1,7 -0.2 4.2)xlabel(t),ylabel(f1(t)set(gca,XTick,0,2,4,6,YTick,0,2,4)%定義坐標(biāo)軸刻度標(biāo)記的位置set(gca,XTickLabel,0,2,4,6,YTickLabel,0,2,4)%定義坐標(biāo)軸刻度的標(biāo)簽 f2=2*rectpuls(t-3,6)+2*tripuls(t-3,2);figure(2),line(t,f2,linewidth,2);axis(-1 7 -0.2 4.2)xlabel(t),ylabel(f2(t)set(gca,XTick,0,2,3,4,6,YTick,0,2,4)set(gca,XTickLabel,0,2,3,4,6,YTickLabel,0,2,4) f3=6*tripuls(t-3,6)-2*tripuls(t-3,2);figure(3),plot(t,f3,linewidth,2);axis(-1 7 -0.2 4.2)xlabel(t),ylabel(f3(t)set(gca,XTick,0,2,4,6,YTick,0,4)set(gca,XTickLabel,0,2,4,6,YTickLabel,0,4)（2）波形3 用MATALB畫出圖2.1-11所示信號。其中，K=10，A=5。圖2.1-11 解:（1）程序t=linspace(-1,4*pi,400);f1=10*abs(sin(t).*heaviside(t);figure(1),line(t,f1,linewidth,2);axis(0,2*pi,0,11.2)set(gca,XTick,0,pi,2*pi,YTick,0,10)set(gca,XTickLabel,0,pi,2*pi,YTickLabel,0,A)xlabel(t),ylabel(f1(t) t=linspace(-0.5,3,400);f2=5*t.2.*rectpuls(t-0.5,1)+5*(t-1).2.*rectpuls(t-1.5,1)+5*(t-2).2.*rectpuls(t-2.5,1);figure(2),line(t,f2,linewidth,2);axis(-0.5 3.5 -0.2 5.2)set(gca,XTick,0,1,2,3,YTick,0,5)set(gca,XTickLabel,0,1,2,3,YTickLabel,0,A)xlabel(t),ylabel(f2(t)text(string,t2,position,1.3,1.7)（2）波形4 試用Matlab繪制出如下連續(xù)時間信號的時域波形，并觀察信號是否為周期信號。若是周期信號，周期是多少？(a) (b) (c) 解：（1）程序t=linspace(-8,8,400);f1=3*sin(pi/2*t)+2*sin(pi*t)+sin(2*pi*t);figure(1),plot(t,f1,linewidth,2);axis(-8 8 -5 5)xlabel(Time(sec),ylabel(f1(t) t=linspace(-8,8,400);f2=sin(t)+2*cos(4*t)+sin(5*t);figure(2),plot(t,f2,linewidth,2);axis(-8 8 -2.5 4.5)xlabel(Time(sec),ylabel(f2(t