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WM8608 Arkusz danych(PDF) 32 Page - Wolfson Microelectronics plc

Numer części WM8608
Szczegółowy opis  5 TO 7.1 CHANNEL PWM CONTROLLER
PDF  54 Pages
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Producent  WOLFSON [Wolfson Microelectronics plc]
Strona internetowa  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8608 Arkusz danych(HTML) 32 Page - Wolfson Microelectronics plc

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WM8608
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PP Rev 1.5 March 2004
32
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
EQ1CF
1
Band 1 Front-Left/Front Right Centre-
Frequency
0 = High Cutoff (500Hz)
1 = Low Cutoff (250Hz)
1
EQ1CFC
1
Band 1 Front-Centre Centre-Frequency
0 = High Cutoff (500Hz)
1 = Low Cutoff (250Hz)
2
EQ2CF
1
Band 2 Front-Left/Front Right Centre-
Frequency
0 = High Cutoff (2kHz)
1 = Low Cutoff (1kHz)
3
EQ2CFC
1
Band 2 Front-Centre Centre-Frequency
0 = High Cutoff (2kHz)
1 = Low Cutoff (1kHz)
4
EQ3CF
1
Band 3 Front-Left/Front Right Cutoff
Frequency
0 = High Cutoff (8kHz)
1 = Low Cutoff (4kHz)
R18 (12h)
EQ Centre-
Frequency
Control
5
EQ3CFC
1
Band 3 Front-Centre Cutoff Frequency
0 = High Cutoff (8kHz)
1 = Low Cutoff (4kHz)
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.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
LSCO
0
LSEQ Filter Characteristic
0 = High Cutoff (15kHz)
1 = Low Cutoff (10kHz)
R19 (13h)
Loudspeaker
Equaliser
3:1
LSEQ
[2:0]
100
(Disabled)
High Frequency Equalisation
000 = +2dB
001 = +1.5dB
010 = +1dB
011 = +0.5dB
100 = Disable
101 = -0.5dB
110 = -1dB
111 = -1.5dB
Table 30 Loudspeaker Equaliser



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