blob: b06fc5d6894b2174a9632e0f2fe73965740cea63 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
//Example 5_16
//Fourier Transform of x(t)=exp(-a*t)*cos(wc*t)*u(t)
clear;
clc;
a=1;
wc=1;
Dt=0.005;
t=0: Dt :10;
xt=(exp(t*(-a+wc))+exp(t*(-a-wc)))/2;
Wmax=2*%pi*1;
K=4;
k=0:(K/1000):K;
W=k*Wmax/K;
XW=xt*exp(-sqrt(-1)*t'*W)*Dt;
XW_Mag=abs(XW);
W=[-mtlb_fliplr(W),W(2:1001)];
XW_Mag=[mtlb_fliplr(XW_Mag),XW_Mag(2:1001)];
[XW_Phase,db]=phasemag(XW);
XW_Phase=[-mtlb_fliplr(XW_Phase),XW_Phase(2:1001)];
//Plotting Continuous Time Signal
figure(1)
plot(t,xt);
xlabel('t in sec.');
ylabel('x(t)')
title('Continuous Time Signal')
figure(2)
//Plotting Magnitude Response of CTS
subplot(2,1,1);
plot(W,XW_Mag);
xlabel('Frequency in Radians/Seconds>W');
ylabel('abs(X(jW))')
title('Magnitude Response (CTFT)')
//Plotting Phase Reponse of CTS
subplot(2,1,2);
plot(W,XW_Phase*%pi/180);
xlabel('Frequency in Radians/Seconds>W');
ylabel('<X(jW)')
title('Phase Response (CTFT) in Radians')
|
