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WM8750 Datasheet(PDF) 28 Page - Wolfson Microelectronics plc

Part # WM8750
Description  Stereo CODEC for Portable Audio Applications
PDF  60 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8750 Datasheet(HTML) 28 Page - Wolfson Microelectronics plc

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WM8750BL
Production Data
w
PD, Rev 4.1, August 2012
28
GRAPHIC EQUALISER
The WM8750BL has a digital graphic equaliser and adaptive bass boost function. This function
operates on digital audio data before it is passed to the audio DACs. Bass enhancement can take two
different forms:
Linear bass control: bass signals are amplified or attenuated by a user programmable
gain. This is independent of signal volume, and very high bass gains on loud signals may
lead to signal clipping.
Adaptive bass boost: The bass volume is amplified by a variable gain. When the bass
volume is low, it is boosted more than when the bass volume is high. This method is
recommended because it prevents clipping, and usually sounds more pleasant to the
human ear.
Treble control applies a user programmable gain, without any adaptive boost function. Bass and
treble control are completely independent with separately programmable gains and filter
characteristics.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R12 (0Ch)
Bass Control
7
BB
0
Bass Boost
0 = Linear bass control
1 = Adaptive bass boost
6
BC
0
Bass Filter Characteristic
0 = Low Cutoff (130Hz at 48kHz sampling)
1 = High Cutoff (200Hz at 48kHz sampling)
3:0
BASS
[3:0]
1111
(Disabled)
Bass Intensity
Code
BB=0
BB=1
0000
+9dB
15 (max)
0001
+9dB
14
0010
+7.5dB
13
0011
+6dB
12
0100
+4.5dB
11
0101
+3dB
10
0110
+1.5dB
9
0111
0dB
8
1000
-1.5dB
7
1001
-3dB
6
1010
-4.5dB
5
1011
-6dB
4
1100
-6dB
3
1101
-6dB
2
1110
-6dB
1
1111
Bypass (OFF)
R13 (0Dh)
Treble Control
6
TC
0
Treble Filter Characteristic
0 = High Cutoff (8kHz at 48kHz sampling)
1 = Low Cutoff (4kHz at 48kHz sampling)
3:0
TRBL
[3:0]
1111
(Disabled)
Treble Intensity
0000 or 0001 = +9dB
0010 = +7.5dB
… (1.5dB steps)
1011 to 1110 = -6dB
1111 = Disable
Table 18 Graphic Equaliser



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