Digital Signal Processing Reference
In-Depth Information
Table 8.11
Designed Filter Banks
Filter Banks
Coefficients for the Numerator
Coefficients for the Denominator
Bandpass filter 0
0.0031954934, 0,
0.0031954934
1,
1.9934066716 , 0.9936090132
Bandpass filter 1
0.0063708102, 0,
0.0063708102
1,
1.9864516324, 0.9872583796
Bandpass filter 2
0.0126623878, 0,
0.0126623878
1,
1.9714693192, 0.9746752244
Bandpass filter 3
0.0310900413, 0,
0.0310900413
1,
1.9181849043, 0.9378199174
Bandpass filter 4
0.0746111954, 0,
0.0746111954
1,
1.7346085867, 0.8507776092
Bandpass filter 5
0.1663862883, 0,
0.1663862884
1,
1.0942477187, 0.6672274233
Bandpass filter 6
0.3354404899, 0,
0.3354404899
1, 0.7131366534, 0.3291190202
To complete the design and simulation, second-order IIR bandpass Butterworth filters are chosen
for the audio equalizer; the coefficients are determined using the BLT method, and are given in
The magnitude response for each filter bank is plotted in
Figure 8.25
for design verification. As
shown in
Figure 8.25
, after careful examination, the magnitude response of each filter band meets the
design specification. We will perform simulation next.
10
0
10
-1
10
-2
10
-3
10
-4
10
-5
10
-6
10
1
10
2
10
3
10
4
10
5
Frequency (Hz)
FIGURE 8.25
Magnitude frequency responses for the audio equalizer.
Search WWH ::
Custom Search