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WM8602SEDS/V Arkusz danych(PDF) 27 Page - Wolfson Microelectronics plc

Numer części WM8602SEDS/V
Szczegółowy opis  2.1 CHANNEL PWM CONTROLLER
PDF  46 Pages
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Producent  WOLFSON [Wolfson Microelectronics plc]
Strona internetowa  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8602SEDS/V Arkusz danych(HTML) 27 Page - Wolfson Microelectronics plc

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WM8602
w
PP Rev 1.5 May 2004
27
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R17 (11h)
EQ Band 3
Gain Control
3:0
EQ3GF
[3:0]
1111
(Disabled)
Band 3 Left/Right Gain
0000 or 0001 = +9dB
0010 = +7.5dB
… (1.5dB steps)
1011 to 1110 = -6dB
1111 = Disable
Table 27 EQ Band 3 Gain Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
EQ1CF
1
Band 1 Left/Right Centre-Frequency
0 = High Cutoff (500Hz)
1 = Low Cutoff (250Hz)
2
EQ2CF
1
Band 2 Left/Right Centre-Frequency
0 = High Cutoff (2kHz)
1 = Low Cutoff (1kHz)
R18 (12h)
EQ Centre-
Frequency
Control
4
EQ3CF
1
Band 3 Left/Right Cutoff Frequency
0 = High Cutoff (8kHz)
1 = Low Cutoff (4kHz)
Table 28 EQ Frequency Control
Band 0 is controlled via the sub-woofer volume control register R11 as described in Table 31. 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 23.
DIGITAL LOUDSPEAKER EQUALISER
A loudspeaker equaliser is provided 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 cut-off 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 Left and Right 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 29 Loudspeaker Equaliser



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