522
Practical MATLAB
® Applications for Engineers
20
30
time index n
40
50
60
10
0
0
0.2
0.4
0.6
Amplitude
0.8
1
f(n) versus t
FIGURE 5.34
Plot of f(n) of Example 5.7.
20
15
10
5
0
20
15
10
5
0
0
50
100
150
200
250
0
50
100
150
200
250
DTFT
DFT for k = 32
DFT for k = 64
DTFT
Amplitude
Amplitude
Index k
Magnitudes of the DTFT and DFT
FIGURE 5.35
Magnitude plots of DTFT and DFT of f(n) of Example 5.7.
subplot(2,1,2)
plot(W,angle(DFT _ fn))
hold on
plot(WWW,angle(DFT _ fn64),‘o’,WWW,angle(DFT _ fn64));
ylabel(‘Phase angle’)
xlabel(‘Index k’)
The script fi le rectang is executed and the results are indicated in Figures 5.34 through
5.36.
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7/23/2008 1:47:34 PM