參數(shù)資料
型號： AK4671
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： Stereo CODEC with MIC/RCV/HP-AMP
中文描述： 立體聲編解碼器麥克風/垃圾車/惠普腺苷
文件頁數(shù)： 66/164頁
文件大?。?/td> 1792K
代理商： AK4671
[AK4671]
MS0666-E-00
2007/10
- 66 -
(5)
5-band Notch
This block can be used as Equalizer or Notch Filter. 5-band Equalizer (EQ1, EQ2, EQ3, EQ4 and EQ5) is ON/OFF
independently by EQ1, EQ2, EQ3, EQ4 and EQ5 bits. When Equalizer is OFF, the audio data passes this block by 0dB
gain. E1A15-0, E1B15-0 and E1C15-0 bits set the coefficient of EQ1. E2A15-0, E2B15-0 and E2C15-0 bits set the
coefficient of EQ2. E3A15-0, E3B15-0 and E3C15-0 bits set the coefficient of EQ3. E4A15-0, E4B15-0 and E4C15-0
bits set the coefficient of EQ4. E5A15-0, E5B15-0 and E5C15-0 bits set the coefficient of EQ5. The EQx (x=1
～
5)
coefficient should be set when EQx bit =
“
0
”
or PMADL=PMADR=PMDAL=PMDAR bits = “0”.
fs: Sampling frequency
fo
1
~ fo
5
: Center frequency
fb
1
~ fb
5
: Band width where the gain is 3dB different from center frequency
K
1
~ K
5
: Gain (
1
≤
K
n
≤
3)
Register setting (
Note 61
)
EQ1: E1A[15:0] bits =A
1
, E1B[15:0] bits =B
1
, E1C[15:0] bits =C
1
EQ2: E2A[15:0] bits =A
2
, E2B[15:0] bits =B
2
, E2C[15:0] bits =C
2
EQ3: E3A[15:0] bits =A
3
, E3B[15:0] bits =B
3
, E3C[15:0] bits =C
3
EQ4: E4A[15:0] bits =A
4
, E4B[15:0] bits =B
4
, E4C[15:0] bits =C
4
EQ5: E5A[15:0] bits =A
5
, E5B[15:0] bits =B
5
, E5C[15:0] bits =C
5
(MSB=E1A15, E1B15, E1C15, E2A15, E2B15, E2C15, E3A15, E3B15, E3C15, E4A15, E4B15, E4C15,
E5A15, E5B15, E5C15; LSB= E1A0, E1B0, E1C0, E2A0, E2B0, E2C0, E3A0, E3B0, E3C0, E4A0, E4B0,
E4C0, E5A0, E5B0, E5C0)
A
n
= K
n
x
1 + tan (
π
fb
n
/fs)
tan (
π
fb
n
/fs)
B
n
= cos(2
π
fo
n
/fs) x
2
1 + tan (
π
fb
n
/fs)
,
C
n
=
1
tan (
π
fb
n
/fs)
1 + tan (
π
fb
n
/fs)
,
(n = 1, 2, 3, 4, 5)
Transfer function
H(z) = 1 + h
1
(z) + h
2
(z) + h
3
(z) + h
4
(z) + h
5
(z)
h
n
(z) = A
n
1
z
2
1
B
n
z
1
C
n
z
2
(n = 1, 2, 3, 4, 5)
The center frequency should be set as below.
fo
n
/ fs < 0.497
Note 61. [Translation the filter coefficient calculated by the equations above from real number to binary code (2’s
complement)]
X = (Real number of filter coefficient calculated by the equations above) x 2
13
X should be rounded to integer, and then should be translated to binary code (2’s complement).
MSB of each filter coefficient setting register is sine bit.
相關PDF資料
PDF描述
AK4671EG Stereo CODEC with MIC/RCV/HP-AMP
AK4673 Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4673EG Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4682 Multi-channel CODEC with 2Vrms Stereo Selector
AK4682EQ Multi-channel CODEC with 2Vrms Stereo Selector
相關代理商/技術參數(shù)
參數(shù)描述
AK4671_10 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP-AMP
AK4671EG 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP-AMP
AK4673 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4673EG 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4675 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP/SPK-AMP
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