參數(shù)資料
型號(hào): AK4647
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普腺苷
文件頁(yè)數(shù): 32/72頁(yè)
文件大小: 565K
代理商: AK4647
ASAHI KASEI
[AK4647]
MS0566-E-00
2006/11
- 32 -
3) EQ
fs: Sampling frequency
fc
1
: Pole frequency
fc
2
: Zero-point frequency
f: Input signal frequency
K: Filter gain [dB] (Maximum +12dB)
Register setting
EQA[15:0] bits =A, EQB[13:0] bits =B, EQC[15:0] bits =C
(MSB=EQA15, EQB13, EQC15; LSB=EQA0, EQB0, EQC0)
1 + 1 / tan (
π
fc
2
/fs)
A = 10
K/20
x
1 + 1 / tan (
π
fc
1
/fs)
B =
1
1 / tan (
π
fc
1
/fs)
1 + 1 / tan (
π
fc
1
/fs)
,
C =10
K/20
x
1
1 / tan (
π
fc
2
/fs)
1 + 1 / tan (
π
fc
1
/fs)
,
Transfer function
Amplitude
Phase
H(z) =
A + Cz
1
1 + Bz
1
M(f) =
A
2
+ C
2
+ 2ACcos (2
π
f/fs)
1 + B
2
+ 2Bcos (2
π
f/fs)
θ
(f) = tan
1
(AB
C)sin (2
π
f/fs)
A + BC + (AB+C)cos (2
π
f/fs)
[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.
[Filter Coefficient Setting Example]
1) FIL1 block
Example: HPF, fs=44.1kHz, fc=100Hz
F1AS bit = “0”
F1A[13:0] bits = 01 1111 1100 0110
F1B[13:0] bits = 10 0000 0111 0100
2) EQ block
Example: fs=44.1kHz, fc
1
=300Hz, fc
2
=3000Hz, Gain=+8dB
Gain[dB]
+8dB
fc
1
fc
2
Frequency
EQA[15:0] bits = 0000 1001 0110 1110
EQB[13:0] bits = 10 0001 0101 1001
EQC[15:0] bits = 1111 1001 1110 1111
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