clc;

clear all;

t_step=0.0001;

t_end=0.1;

t=0:t_step:t_end;

x=(sin(20*pi*t)+sin(100*pi*t)+sin(200*pi*t));

subplot(3,1,1)

plot(t,x,'.'), grid on

xlabel('Figure 1:x(t)=sin(20*pi*t+30)')

%code for sampling

fs=500;

ts=1/fs;

t1=0:ts:t_end;

x1=(sin(20*pi*t1)+sin(100*pi*t1)+sin(200*pi*t1));

subplot(3,1,2)

stem(t1,x1), grid on

%interpolation(reconstruction of analog signal)

y=interp1(t1,x1,t);

plot(t,y),grid on