Pre-Production
WM8904
DE-EMPHASIS FILTER RESPONSES
MAGNITUDE(dB)
MAGNITUDE(dB)
0.3
0.25
0.2
0
0
5000
10000
15000
20000
-1
-2
-3
0.15
0.1
-4
-5
0.05
0
-6
-7
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
-0.05
-0.1
-0.15
-8
-9
-10
Frequency (Hz)
Frequency (Hz)
Figure 14 De-Emphasis Digital Filter Response (32kHz)
Figure 15 De-Emphasis Error (32kHz)
MAGNITUDE(dB)
MAGNITUDE(dB)
0
0.2
0
5000
10000
15000
20000
25000
-1
-2
0.15
0.1
0.05
0
-3
-4
-5
-6
-7
0
5000
10000
15000
20000
25000
-8
-0.05
-0.1
-9
-10
Frequency (Hz)
Frequency (Hz)
Figure 16 De-Emphasis Digital Filter Response (44.1kHz)
Figure 17 De-Emphasis Error (44.1kHz)
MAGNITUDE(dB)
MAGNITUDE(dB)
0.15
0
0
5000
10000
15000
20000
25000
30000
0.1
0.05
0
-2
-4
-6
0
5000
10000
15000
20000
25000
30000
-0.05
-0.1
-8
-10
-12
-0.15
Frequency (Hz)
Frequency (Hz)
Figure 18 De-Emphasis Digital Filter Response (48kHz)
Figure 19 De-Emphasis Error (48kHz)
PP, Rev 3.3, September 2012
33
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
