DTFT, DFT, ZT, and FFT
507
0.5
1
1.5
2
2.5
DTFT [0.6
n u(n)] using freqz
Magnitude
−4
−3
−2
−1
0
1
2
3
4
−1
−0.5
0
0.5
1
frequency W in rad.
−4
−3
−2
−1
0
1
2
3
4
frequency W in rad.
Phase in rad.
FIGURE 5.19
DTFT of f(n) using freqz of Example 5.1.
FIGURE 5.20
Error evaluation (parts b and c) of Example 5.1.
0
5
10
Magnitude error
Amplitude
−4
−3
−2
−1
0
1
2
3
4
−4
−3
−2
−1
0
1
2
3
4
−2
−1
−5
0
1
2
× 10
−16
× 10
−16
frequency W in rad.
Phase error
Phase in rad.
CRC_47760_CH005.indd 507
CRC_47760_CH005.indd 507
7/23/2008 1:47:30 PM
7/23/2008 1:47:30 PM