Natural Sampling by Pulse-train

Matlab program for Natural Sampling by Pulse-train.

Matlab code

clc; close all; clear all;

fm=input('Enter the frequency of Message signal = ');

fc=input('Enter the frequency of Carrier signal = ');

A=input('Enter the amplitude of Message signal = ');

t = 0:0.0001:1/fm;

Sm=A*sin(2*pi*fm*t); % Message signal

tc=1/fc; % Time period of Carrier signal

d=0:tc:length(t);

width=tc/2; % High time of one Pulse

Sp=pulstran(t,d,'rectpuls',width); % Carrier signal (Pulse-train)

Sn=Sp.*Sm; % Natural Sampled Signal

subplot(3,1,1);

plot(t,Sm);

xlabel('Time-->');

ylabel('Amplitude-->');

title('Message Signal');

subplot(3,1,2);

plot(t,Sp);

xlabel('Time-->');

ylabel('Amplitude-->');

title('Carrier Signal (Pulse-train)');

axis([0 1/fm -A-1 A+1]);

subplot(3,1,3);

plot(t,Sn);

xlabel('Time-->');

ylabel('Amplitude-->');

title('Natural Sampled Signal');

Command window

Enter the frequency of Message signal = 2.

Enter the frequency of Carrier signal = 100.

Enter the amplitude of Message signal = 1.

Figure window