t=[-100:1:100];

m=cos(pi/30*t); s=20*cos(wc*t); FM=20*cos(pi/5*t+5*sin(pi/30*t)); PM=20*cos(pi/5*t+5*cos(pi/30*t)); subplot(3,1,1);plot(t,m); grid; xlabel('t');ylabel('m');title('信号波形图'); subplot(3,1,2);plot(t,s);grid; xlabel('t');ylabel('s');title('载波信号波形图'); subplot(3,1,3);plot(t,FM);grid; xlabel('t');ylabel('FM');title('FM 信号波形图'); figure

subplot(3,1,1);plot(t,m); grid; xlabel('t');ylabel('m');title('信号波形图'); subplot(3,1,2);plot(t,s);grid; xlabel('t');ylabel('s');title('载波信号波形图'); subplot(3,1,3);plot(t,PM);grid; xlabel('t');ylabel('PM');title('PM 信号波形图')

-100

-80-60-40

-20020406080100

-10

1t

m

信号波形图

-100

-80

-60

-40

-20

02040

60

80

100

-200

20t

s 载波信号波形图

-100

-80-60-40-20

020*********

-200

20t

F M

FM 信号波形图