WM8608 ETC-unknow, WM8608 Datasheet - Page 32

• Manufacturer Part Number: WM8608
• Description: The Wm8608 Comprises A High Performance Multi-channel Pwm Digital Power Amplifier Controller. Simply By Adding Appropriate Power Output Stages A Multi-channel Power Amplifier May Be Built. Six Identical Full Audio Bandwidth Channels, Plus A Reduced B
• Manufacturer: ETC-unknow

WM8608
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Table 29 EQ Frequency Control
Band 0 is controlled via the sub-woofer volume control register R11 as described in Table 32. The
functionality to add/subtract the boost/cut setting to the sub-woofer volume must be written into the
software controller for the chip.
The Band 0 Cutoff frequency can be changed using the corner frequency of the low-pass/high-pass
filters as described in Table 24.
DIGITAL LOUDSPEAKER EQUALISER
A loudspeaker equaliser is provided for the front three channels to compensate for high-frequency
variations that can occur when loudspeakers of different impedances are used with different output
filters in typical output stages. The equaliser has selectable cutoff frequencies which are independent
of sample rate. The gain at 20kHz is controllable in 0.5dB steps from -1.5dB to +2dB via the LSEQ
control bit. The settings are applied to all three front channels simultaneously.
Table 30 Loudspeaker Equaliser
R18 (12h)
EQ Centre-
Frequency
Control
R19 (13h)
Loudspeaker
Equaliser
REGISTER
REGISTER
ADDRESS
ADDRESS
0
1
2
3
4
5
0
3:1
BIT
BIT
EQ1CF
EQ1CFC
EQ2CF
EQ2CFC
EQ3CF
EQ3CFC
LSCO
LSEQ
[2:0]
LABEL
LABEL
0
100
(Disabled)
DEFAULT
1
1
1
1
1
1
DEFAULT
LSEQ Filter Characteristic
0 = High Cutoff (15kHz)
1 = Low Cutoff (10kHz)
High Frequency Equalisation
000 = +2dB
001 = +1.5dB
010 = +1dB
011 = +0.5dB
100 = Disable
101 = -0.5dB
110 = -1dB
111 = -1.5dB
Band 1 Front-Left/Front Right Centre-
Frequency
0 = High Cutoff (500Hz)
1 = Low Cutoff (250Hz)
Band 1 Front-Centre Centre-Frequency
0 = High Cutoff (500Hz)
1 = Low Cutoff (250Hz)
Band 2 Front-Left/Front Right Centre-
Frequency
0 = High Cutoff (2kHz)
1 = Low Cutoff (1kHz)
Band 2 Front-Centre Centre-Frequency
0 = High Cutoff (2kHz)
1 = Low Cutoff (1kHz)
Band 3 Front-Left/Front Right Cutoff
Frequency
0 = High Cutoff (8kHz)
1 = Low Cutoff (4kHz)
Band 3 Front-Centre Cutoff Frequency
0 = High Cutoff (8kHz)
1 = Low Cutoff (4kHz)
DESCRIPTION
DESCRIPTION
PP Rev 1.5 March 2004
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