DTFT, DFT, ZT, and FFT 511
− 4 − 3 − 2 − (^10)
frequency W
1234
1.6
1.4
1.2
1
0.8
Magnitude
0.6
− 4 − 3 − 2 − (^10)
frequency W
1234
0.4
Phase angle in rad.
0.2
0
−0.2
−0.6
DTFT[f1(n)] = 1./(1-0.3exp(-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
1234
− 4
− 2
− 1
0
1
2
− 3 − 2 − 1 0
frequency W
1234
DTFT[f2(n)] = 1./(1-0.9exp(-j.W))
FIGURE 5.23
Plot of DTFT[f 2 (n)] of Example 5.2.