close all;
clear all;
clc;
fs=6000;
t=0:0.001:.1;
t1=0:1/fs:1;
f1=200;
f2=1000;
f3=1500;
f4=2500;
xa1=2*sin(f1*pi*t);
xa2=3*cos(f2*pi*t);
xa3=.5*sin(f3*pi*t);
xa4=sin(f4*pi*t);
xa11=2*sin(f1*pi*t);
xa22=3*cos(f2*pi*t);
xa33=.5*sin(f3*pi*t);
xa44=sin(f4*pi*t);
xa=xa1-xa2-xa3+xa4;
xaa=xa11-xa22-xa33+xa44;
subplot(2,1,1);
plot(t,xa);
ylabel('Amplitude');
xlabel('time t')
title('original wave')
hold on;
subplot(2,1,2);
stem(t1,xaa);
ylabel('Amplitude');
xlabel('time t')
title('Wave sampled at Fs=6000')
hold on;
Best Answer