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WM8983
5-BAND GRAPHIC EQUALISER
A 5-band graphic equaliser is provided, which can be applied to the ADC or DAC path, together with
3D enhancement, under control of the EQ3DMODE register bit. The ADCs and DACs should be
disabled before changing the AQ3DMODE bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R18
EQ Control 1
8
EQ3DMODE
1
0 = Equaliser and 3D Enhancement
applied to ADC path
1 = Equaliser and 3D Enhancement
applied to DAC path
Table 23 EQ and 3D Enhancement DAC or ADC Path Select
The equaliser consists of low and high frequency shelving filters (Band 1 and 5) and three peak
filters for the centre bands. Each has adjustable cut-off or centre frequency, and selectable boost
(+/- 12dB in 1dB steps). The peak filters have selectable bandwidth.
REGISTER
ADDRESS
BIT
LABEL
EQ1G
EQ1C
DEFAULT
DESCRIPTION
R18
4:0
01100
(0dB)
01
Band 1 Gain Control. See Table 29 for
details.
EQ Band 1
Control
6:5
Band 1 Cut-off Frequency:
00 = 80Hz
01 = 105Hz
10 = 135Hz
11 = 175Hz
Table 24 EQ Band 1 Control
REGISTER
ADDRESS
BIT
LABEL
EQ2G
DEFAULT
DESCRIPTION
R19
4:0
01100
(0dB)
01
Band 2 Gain Control. See Table 29 for
details.
EQ Band 2
Control
6:5
8
EQ2C
Band 2 Centre Frequency:
00 = 230Hz
01 = 300Hz
10 = 385Hz
11 = 500Hz
EQ2BW
0
Band 2 Bandwidth Control
0 = narrow bandwidth
1 = wide bandwidth
Table 25 EQ Band 2 Control
REGISTER
ADDRESS
BIT
LABEL
EQ3G
DEFAULT
DESCRIPTION
R20
4:0
01100
(0dB)
01
Band 3 Gain Control. See Table 29 for
details.
EQ Band 3
Control
6:5
8
EQ3C
Band 3 Centre Frequency:
00 = 650Hz
01 = 850Hz
10 = 1.1kHz
11 = 1.4kHz
EQ3BW
0
Band 3 Bandwidth Control
0 = narrow bandwidth
1 = wide bandwidth
Table 26 EQ Band 3 Control
PP Rev 1.1 August 2005
43
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
