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WM8985GEFL/R 데이터시트(PDF) 41 Page - Wolfson Microelectronics plc

부품명 WM8985GEFL/R
상세설명  Multimedia CODEC with Class D Headphone and Line Out
PDF  121 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8985GEFL/R 데이터시트(HTML) 41 Page - Wolfson Microelectronics plc

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Production Data
WM8985
w
PD, Rev 4.6, July 2009
41
PROGRAMMABLE NOTCH FILTER
A programmable notch filter is provided. This filter has a variable centre frequency and bandwidth,
programmable via two coefficients, a0 and a1. These coefficients should be converted to 2’s
complement numbers to determine the register values. A0 and a1 are represented by the register
bits NFA0[13:0] and NFA1[13:0]. Because these coefficient values require four register writes to
setup there is an NFU (Notch Filter Update) flag which should be set only when all four registers are
setup.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R27 (1Bh)
Notch Filter 1
6:0
NFA0[13:7]
0
Notch Filter a0 coefficient, bits [13:7]
7
NFEN
0
Notch filter enable:
0 = Disabled
1 = Enabled
8
NFU
0
Notch filter update. The notch filter
values used internally only update
when one of the NFU bits is set high.
R28 (1Ch)
Notch Filter 2
6:0
NFA0[6:0]
0
Notch Filter a0 coefficient, bits [6:0]
8
NFU
0
Notch filter update. The notch filter
values used internally only update
when one of the NFU bits is set high.
R29 (1Dh)
Notch Filter 3
6:0
NFA1[13:7]
0
Notch Filter a1 coefficient, bits [13:7]
8
NFU
0
Notch filter update. The notch filter
values used internally only update
when one of the NFU bits is set high.
R30 (1Eh)
Notch Filter 4
0-6
NFA1[6:0]
0
Notch Filter a1 coefficient, bits [6:0]
8
NFU
0
Notch filter update. The notch filter
values used internally only update
when one of the NFU bits is set high.
Table 17 Notch Filter Function
The coefficients are calculated as follows:
)
2
/
w
tan(
1
)
2
/
w
tan(
1
a
b
b
0
+
−
=
)
w
cos(
)
a
1
(
a
0
0
1
+
−
=
Where:
s
c
0
f
/
f
2
w
π
=
s
b
b
f
/
f
2
w
π
=
fc = centre frequency in Hz, fb = -3dB bandwidth in Hz, fs = sample frequency in Hz
The coefficients are calculated as follows:
NFA0 = -a0 x 213
NFA1 = -a1 x 212
These values are then converted to 2’s complement notation to determine the register values.



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