HW2-A Seung Seob Lee ECE301Fall2008mboutin - Rhea

A CT periodic signal sampled at different frequencies

It is known that y=cos(x) in CT is a periodic function, and this periodic CT function was sampled at different frequencies in DT.

%%%%%%%%DT input%%%%%%%%%
n=1:1:40


y=cos(pi/8*n);
figure(1)
plot(n,y)


y2=cos(3*n);
figure(2)
plot(n,y2)

FIGURE(1) shows a periodic DT graph

FIGURE(2) not a periodic graph

Making periodic signal by shifting and summing aperiodic signals

I used y=t signal to shift and make periodic signal.

t=[0:0.1:5]
t1=[5:0.1:10]
t2=[10:0.1:15]
y=t
hold on
plot(t,y)
y1=(t)
plot(t1,y1)
y2=(t)
plot(t2,y2)
hold off