Digital Signal Processing Reference
In-Depth Information
H
bp
(e
j
w
)
⎮
⎮
w
c1
w
c2
w
0
π
(
a
)
H
bs
(e
j
w
)
⎮
⎮
w
c1
w
c2
0
π
w
(
b
)
Figure 3.8
Magnitude responses of ideal bandpass and bandstop filters.
Magnitude response of elliptic lowpass filter
1
0.8
Passband
0.6
0.4
0.2
Tran
s
ition band
Stopband
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Normalized frequency w/pi
(
a
)
Magnitude response of Butterworth highpass filter
1.4
1.2
1
0.8
Passband
0.6
0.4
0.2
Stopband
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Normalized frequency w/pi
(
b
)
Figure 3.9
Approximation of ideal lowpass and highpass filter magnitude response.
Search WWH ::
Custom Search