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)

Amplitude_mod.m

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