Digital Signal Processing Reference
In-Depth Information
Lowpass Prototype
0
50
10
0
1
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1
Frequency
ω
/
π
Lowpass Prototype
0.2
0
0
.2
40
30
20
10
0
10
20
30
40
n
Modulated Filter
0
50
10
0
1
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1
Frequency
ω
/
π
Modulated Filter, I Branch
0.2
0
0
.2
40
30
20
10
0
10
20
30
40
n
Modulated Filter, Q Branch
0.2
0
0
.2
40
30
20
10
0
10
20
30
40
n
Fig. 17
An illustration of analytic bandpass filter generation through complex modulation of a
lowpass prototype
