
10
0
10
1
10
2
−35
−30
−25
|H(e
jωT
s)| (db)
−20
−15
−10
−5
0
5
ω (Hz)
ω
0
= 25 Hz
3ω
0
= 75 Hz
T
s
= 0.004 s
FIGURE 4.123 Magnitude function (db) for multinotch filter H
v
0
(z)H
3v
0
(z).
10
0
10
1
10
2
−35
−30
−25
−20
|H(e
jωT
s)| (db)
−15
−10
−5
0
5
ω (Hz)
ω
0
= 25 Hz
3ω
0
= 75 Hz
5ω
0
= 125 Hz
T
s
= 0.004 s
FIGURE 4.124 Magnitude function (db) for multinotch filter H
v
0
(z)H
3v
0
(z)H
5v
0
(z).
H
ω
0
(z) H
3ω
0
(z) H
5ω
0
(z)
u(k)=s(k)+n(k)
y
1
(k) y
2
(k)
y
3
(k)
FIGURE 4.125 Multinotch filter for removing fundamental frequency and first two nonzero harmonics.
336 Simulation of Dynamic Systems with MATLAB
®
and Simulink
®