- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385093 > AK4646 (Asahi Kasei Microsystems Co.,Ltd) Stereo CODEC with MIC/SPK-AMP PDF資料下載
參數(shù)資料
| 型號： | AK4646 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with MIC/SPK-AMP |
| 中文描述： | 立體聲編解碼器麥克風(fēng)/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 37/79頁 |
| 文件大小： | 789K |
| 代理商： | AK4646 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁當(dāng)前第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁
[AK4646]
MS0557-E-02
2007/05
- 37 -
(5)
5-band Notch
This block can be used as Equalizer or Notch Filter. 5-band Equalizer (EQ1, EQ2, EQ3, EQ4 and EQ5) is selected
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= PMDAC 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 34)
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
When gain of K is set to “-1”, the equalizer becomes notch filter. When it is used as notch filter, central frequency of a real
notch filter deviates from the above-mentioned calculation, if its central frequency of each band is near. The control soft
that is attached to the evaluation board has functions that revise a gap of frequency and calculate the coefficient. When its
central frequency of each band is near, the central frequency should be revised and confirm the frequency response.
Note 34. [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(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4646EN | Stereo CODEC with MIC/SPK-AMP |
| AK4647 | Stereo CODEC with MIC/HP-AMP |
| AK4647VN | Stereo CODEC with MIC/HP-AMP |
| AK4648 | Stereo CODEC with MIC/HP/SPK-AMP |
| AK4648EC | Stereo CODEC with MIC/HP/SPK-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4646_11 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4646EN | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4646ENP-L | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:STEREO CODEC+SPK |
| AK4646EZ | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4647 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。