WM8983
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5-BAND EQUALISER
The WM8983 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.
The plots from Figure 55 to Figure 68 show the frequency responses of each filter with a sampling
frequency of 48kHz, firstly showing the different cut-off/centre frequencies with a gain of 12dB, and
secondly a sweep of the gain from -12dB to +12dB for the lowest cut-off/centre frequency of each
filter.
15
10
5
15
10
5
0
0
-5
-5
-10
-10
-15
-15
10-1
100
101
102
103
104
105
10-1
100
101
102
103
104
105
Frequency (Hz)
Frequency (Hz)
Figure 55 EQ Band 1 Low Frequency Shelf Filter Cut-offs
Figure 56 EQ Band 1 Gains for Lowest Cut-off Frequency
15
10
5
15
10
5
0
0
-5
-5
-10
-15
-10
-15
10-1
100
101
102
103
104
105
10-1
100
101
102
103
104
105
Frequency (Hz)
Frequency (Hz)
Figure 57 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 58 EQ Band 2 – Peak Filter Gains for Lowest
Cut-off Frequency, EQ2BW=0
15
10
5
0
-5
-10
-15
10-2
10-1
100
101
102
103
104
Frequency (Hz)
Figure 59 EQ Band 2 – EQ2BW=0, EQ2BW=1
PP Rev 1.1 August 2005
82
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
