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signalfre=100;
samplingfre=6400;
time=1/samplingfre:1/samplingfre:1/50;
amp=.5;
wave=amp*cos(2*pi*signalfre*time);
figure(1);
plot(time,wave);

signalfre=300;
samplingfre=2400;
time=0:1/samplingfre:1/75;
amp=1;
wave=amp*cos(2*pi*signalfre*time);
figure(2);
plot(time,wave);
title(' Cosine wave with frequency 300');
grid on

signalfre=700;
samplingfre=5600;
time=1/samplingfre:1/samplingfre:1/16;
amp=2;
wave=amp*cos(2*pi*signalfre*time);
figure(3);
plot(time(1:40),wave(1:40));
title(' Cosine wave with frequency 700');
set(gca,'ytick',[ -2.0   0 2.0 ])
xlabel('Time (sec)');
ylabel('Amplitude');

signalfre=1500;
samplingfre=24000;
time=1/samplingfre:1/samplingfre:1/16;
amp=2;
wave=amp*cos(2*pi*signalfre*time);
figure(4);
plot(time(1:128),wave(1:128));
title(' Cosine wave with frequency 1500');
xlabel('Time (sec)');
ylabel('Amplitude');
axis([0,time(128),-2,2])
grid on

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