实验一信号的MATLAB表示三、实验内容、源程序及执行结果1、用MATLAB表示连续信号：Aeat>>A=2;t=0:0.001:20;a=1;f=A*exp(a*t);plot(t,f)02468101214161820012345678910x108Acos(w0t+φ)>>A=1;t=0:0.001:3;w0=2*pi;phi=pi/6;f=A*cos(w0*t+phi);plot(t,f)00.511.522.53-1-0.8-0.6-0.4-0.200.20.40.60.81Asin(w0t+φ)>>A=1;t=0:0.001:3;w0=2*pi;phi=pi/6;f=A*sin(w0*t+phi);plot(t,f)00.511.522.53-1-0.8-0.6-0.4-0.200.20.40.60.812、用信号处理工具箱提供的函数表示抽样信号、矩形脉冲信号及三角脉冲信号。y=sinc(t)>>t=-10:0.001:10;f=sinc(t);plot(t,f)-10-8-6-4-20246810-0.4-0.200.20.40.60.81y=rectpuls(t,width)>>t=-10:0.001:10;T=1;f=rectpuls(t-2*T,2*T);plot(t,f)-10-8-6-4-2024681000.10.20.30.40.50.60.70.80.91y=tripuls(t,width,skew)>>t=-4:0.001:4;f=tripuls(t,2,0.5);plot(t,f)-4-3-2-10123400.10.20.30.40.50.60.70.80.913、编写如图所示的MATLAB函数，并画出f(0.5t),f(2-0.5t)的图形f(t)>>t=-4:0.001:4;>>f=rectpuls(t+0.5,1)+tripuls(t-0.5,1,-1)-rectpuls(t-1.5,1);plot(t,fun)-4-3-2-101234-1-0.8-0.6-0.4-0.200.20.40.60.81f(0.5t)>>t=-4:0.001:8;>>f=rectpuls(0.5*t+0.5,1)+tripuls(0.5*t-0.5,1,-1)-rectpuls(0.5*t-1.5,1);>>plot(t,f)-4-202468-1-0.8-0.6-0.4-0.200.20.40.60.81f(2-0.5t)>>t=-4:0.001:8;>>fun=rectpuls(2-0.5*t+0.5,1)+tripuls(2-0.5*t-0.5,1,-1)-rectpuls(2-0.5*t-1.5,1);>>plot(t,fun)-4-202468-1-0.8-0.6-0.4-0.200.20.40.60.814、用MATLAB表示离散信号ak>>k=0:5;a=0.6;f=a.^k;stem(k,f)00.511.522.533.544.5500.10.20.30.40.50.60.70.80.91Asin(k)>>k=0:50;A=2;f=A*sin(k);stem(k,f)05101520253035404550-2-1.5-1-0.500.511.52
