fm=input( Enter the message signal frequency fm= )

fc=input( Enter the carrier frequency fc= )

Am=input( Enter the message signal amplitude Am= )

Ac=input( Enter the carrier signal frequency Ac= )

n=input( Enter the no of DFT points: )

tm=(1/fm)

tc=(1/fc)

nfc=40

t=0:(tc/nfc):4*tm

msg=Am*cos(2*pi*fm*t)

car=Ac*cos(2*pi*fc*t)

Modulation

dsb=msg.*car

AM=(dsb/Ac)+car

figure(1)

subplot(2,1,1)

plot(t,msg)

subplot(2,1,2)

plot(t,car)

figure(2)

subplot(2,1,1)

plot(t,dsb)

subplot(2,1,2)

plot(t,AM) -fm=input( Enter the message signal frequency fm= )

fc=input( Enter the carrier frequency fc= )

Am=input( Enter the message signal amplitude Am= )

Ac=input( Enter the carrier signal frequency Ac= )

n=input( Enter the no of DFT points: )

tm=(1/fm)

tc=(1/fc)

nfc=40

t=0:(tc/nfc):4*tm

msg=Am*cos(2*pi*fm*t)

car=Ac*cos(2*pi*fc*t)

　Modulation

dsb=msg.*car

AM=(dsb/Ac)+car

figure(1)

subplot(2,1,1)

plot(t,msg)

subplot(2,1,2)

plot(t,car)

figure(2)

subplot(2,1,1)

plot(t,dsb)

subplot(2,1,2)

plot(t,AM)