DTFT, DFT, ZT, and FFT 513
− 8
0.6
0.8
1
1.2
Magnitude
Phase angle in rad.
1.4
1.6
− 6 − 4 − 2 0
frequency W
2468
− 8 − 6 − 4 − 2 0246 8
−0.4
−0.2
0
0.2
0.4
frequency W
DTFT[f1(n)] = 1./(1-0.3*exp(-j.*W))
FIGURE 5.26
Plot of F 1 (ejW) over the range −2π < W < 2π of Example 5.2.
− 8
0
5
10
Magnitude
Phase angle in rad.
15
− 6 − 4 − 2 0
frequency W
2468
− 8 − 6 − 4 − 2 0246 8
− 2
− 1
0
1
2
frequency W
DTFT[f2(n)] = 1./(1-0.9*exp(-j.*W))
FIGURE 5.27
Plot of F 2 (ejW) over the range −2π < W < 2π of Example 5.2.