DTFT, DFT, ZT, and FFT
511
−4
−3
−2
−1
0
frequency W
1
2
3
4
1.6
1.4
1.2
1
0.8
Magnitude
0.6
−4
−3
−2
−1
0
frequency W
1
2
3
4
0.4
Phase angle in rad.
0.2
0
−0.2
−0.6
DTFT[f1(n)] = 1./(1-0.3*exp(-j.*W))
FIGURE 5.22
Plot of DTFT[f 1 (n)] of Example 5.2.
−4
0
2
4
6
Magnitude
Phase angle in rad.
8
10
−3
−2
−1
0
frequency W
1
2
3
4
−4
−2
−1
0
1
2
−3
−2
−1
0
frequency W
1
2
3
4
DTFT[f2(n)] = 1./(1-0.9*exp(-j.*W))
FIGURE 5.23
Plot of DTFT[f 2 (n)] of Example 5.2.
CRC_47760_CH005.indd 511
CRC_47760_CH005.indd 511
7/23/2008 1:47:31 PM
7/23/2008 1:47:31 PM