連續(xù)時(shí)間信號(hào)在Matlab中的運(yùn)算

實(shí)驗(yàn)二連續(xù)時(shí)間信號(hào)在Matlab中的運(yùn)算 一、實(shí)驗(yàn)?zāi)康?、學(xué)會(huì)運(yùn)用Matlab進(jìn)行連續(xù)時(shí)間信號(hào)的時(shí)移、反褶和尺度變換；2、學(xué)會(huì)運(yùn)用Matlab進(jìn)行連續(xù)時(shí)間信號(hào)微分、積分運(yùn)算；3、學(xué)會(huì)運(yùn)用Matlab進(jìn)行連續(xù)時(shí)間信號(hào)相加、相乘運(yùn)算；4、學(xué)會(huì)運(yùn)用Matlab進(jìn)行連續(xù)時(shí)間信號(hào)卷積運(yùn)算。二、實(shí)驗(yàn)內(nèi)容1、已知信號(hào)的波形（課本P11例題），畫出的波形圖。%實(shí)驗(yàn)二連續(xù)時(shí)間信號(hào)Matlab表示%參考：基于Matlab的信號(hào)與系統(tǒng)試驗(yàn)指導(dǎo)%參數(shù):%t:時(shí)間變量%pi:matlab提供常數(shù)，3.14161、已知信號(hào)的波形（課本P11例題），畫出的波形圖。clearall;closeall;clct=-5:0.01:5;y1=2*exp(-(t/4).^2);y2=2*exp(-((t-2)/4).^2);y3=2*exp(-(3*t/4).^2);y4=2*exp(-(-t/4).^2);subplot(2,2,1);plot(t,y1);axis([-6,6,0,3]);title('f1(t)');gridon;subplot(2,2,2);plot(t,y2);axis([-6,6,0,3]);title('f2(t)');gridon;subplot(2,2,3);plot(t,y3);axis([-6,6,0,3]);title('f3(t)');gridon;subplot(2,2,4);plot(t,y4);axis([-6,6,0,3]);title('f4(t)');gridon;2、使用微分命令求關(guān)于變量x的一階導(dǎo)數(shù)；使用積分命令計(jì)算不定積分，定積分。clearall;closeall;clcsymsx;y=x*sin(x)*log(x);dy=diff(y,'x',1)z=x^5-2*x*x+sqrt(x)/2;lz=int(z,'x')w=x*exp(x)/[(1+x)^2];lw=int(w,'x',0,1)dy=sin(x)*log(x)+x*cos(x)*log(x)+sin(x)lz=1/6*x^6-2/3*x^3+1/3*x^(3/2)lw=1/2*exp(1)-13、已知，使用命令畫出兩信號(hào)和及兩信號(hào)乘積的波形圖。其中，clc;clearall;t=-2:0.01:2;y1=sin(2*pi*t);y2=sin(8*2*pi*t);y3=sin(2*pi*t).*sin(8*2*pi*t);plot(t,y1,t,y2,t,y3);axis([-22-11]);xlabel('t'),ylabel('y');gridon;4、functionf=uCT(t)f=(t>=0);clearall;closeall;clc;t=-1:0.01:4;dt=0.01;f1=uCT(t)-uCT(t-2);f2=uCT(t)+uCT(t-1)-uCT(t-2);f=conv(f1,f2)*dt;n=length(f);tt=(0:n-1)*dt-2;plot(tt,f);gridon;axis([-27-14]);title('f(t)=f1(t)*f2(t)')