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1、1.常见信号的Matlab表示及运算作业题1、用MATLAB命令函数分别绘出抽样信号、矩形脉冲信号、周期矩形脉冲信号、三角波脉冲信号、三角波周期信号的波形，理解其中参数的意义。t=-20:0.01:20;f10=sinc(t);f20=rectpuls(t,2);f30=square(t,2);f40=tripuls(t,0.5);f50=sawtooth(t,0.5);subplot(5,1,1);plot(t,f10);axis([-10,10,-2,2]);subplot(5,1,2);plot(t,f20);a
2、xis([-10,10,-2,2]);subplot(5,1,3);plot(t,f30);axis([-10,10,-2,2]);subplot(5,1,4);plot(t,f40);axis([-10,10,-2,2]);subplot(5,1,5);plot(t,f50);axis([-10,10,-2,2]);141.常见信号的Matlab表示及运算作业题t=-20:0.01:20;f20=rectpuls(t,2);f21=rectpuls(t,4);f22=rectpuls(t,8);f23=rectpul
3、s(t,16);f24=rectpuls(t,32);subplot(5,1,1);plot(t,f20);axis([-10,10,-2,2]);subplot(5,1,2);plot(t,f21);axis([-10,10,-2,2]);subplot(5,1,3);plot(t,f22);axis([-10,10,-2,2]);subplot(5,1,4);plot(t,f23);axis([-10,10,-2,2]);subplot(5,1,5);plot(t,f24);axis([-18,18,-2,2]);
4、141.常见信号的Matlab表示及运算作业题m=5/pi;t=-20:0.0001:20;f30=square(t,4*pi);f31=square(t,8*pi);f32=square(t,16*pi);f33=square(m*t,25);f34=square(m*t,50);subplot(5,1,1);plot(t,f30);axis([-10,10,-2,2]);subplot(5,1,2);plot(t,f31);axis([-10,10,-2,2]);subplot(5,1,3);plot(t,f32)
5、;axis([-10,10,-2,2]);subplot(5,1,4);plot(t,f33);axis([-10,10,-2,2]);subplot(5,1,5);plot(t,f34);axis([-10,10,-2,2]);t=-20:0.01:20;f40=tripuls(t,2);f41=tripuls(t,4);141.常见信号的Matlab表示及运算作业题f42=tripuls(t,8);f43=tripuls(t,16);f44=tripuls(t,32);subplot(5,1,1);plot(t,f
6、40);axis([-10,10,-2,2]);subplot(5,1,2);plot(t,f41);axis([-10,10,-2,2]);subplot(5,1,3);plot(t,f42);axis([-10,10,-2,2]);subplot(5,1,4);plot(t,f43);axis([-10,10,-2,2]);subplot(5,1,5);plot(t,f44);axis([-18,18,-2,2]);m=5/pi;t=-20:0.0001:20;f50=sawtooth(t,0.25);f51=sa
7、wtooth(t,0.5);f52=sawtooth(t,0.75);f53=sawtooth(m*t,0.25);f54=sawtooth(m*t,0.75);141.常见信号的Matlab表示及运算作业题subplot(5,1,1);plot(t,f50);axis([-10,10,-2,2]);subplot(5,1,2);plot(t,f51);axis([-10,10,-2,2]);subplot(5,1,3);plot(t,f52);axis([-10,10,-2,2]);subplot(5,1,4);pl
8、ot(t,f53);axis([-10,10,-2,2]);subplot(5,1,5);plot(t,f54);axis([-10,10,-2,2]);2、分别用MATLAB的数值运算和符号运算功能，绘出下列连续时间信号的波形。1ft=2-e-2tut2ft=cosπt2ut-ut-43ft=etcostut4ft=23tut+
