參數(shù)資料
型號： AK4642EN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： Stereo CODEC with MIC/HP/SPK-AMP
中文描述： 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù)： 34/83頁
文件大小： 670K
代理商： AK4642EN
ASAHI KASEI
[AK4642EN]
MS0420-E-00
2005/09
- 34 -
[Filter Coefficient Setting]
1) When FIL1 and FIL3 are set to “HPF”
fs: Sampling frequency
fc: Cut-off frequency
f: Input signal frequency
K: Filter gain [dB] (Filter gain of should be set to 0dB.)
Register setting
FIL1: F1AS bit = “0”, F1A[13:0] bits =A, F1B[13:0] bits =B
FIL3: F3AS bit = “0”, F3A[13:0] bits =A, F3B[13:0] bits =B
(MSB=F1A13, F1B13, F3A13, F3B13; LSB=F1A0, F1B0, F3A0, F3B0)
1 / tan (
π
fc/fs)
A = 10
K/20
x
1 + 1 / tan (
π
fc/fs)
B =
1
1 / tan (
π
fc/fs)
1 + 1 / tan (
π
fc/fs)
,
Transfer function
Amplitude
Phase
H(z) = A
1
z
1
1 + Bz
1
M(f) = A
2
2cos (2
π
f/fs)
1 + B
2
+ 2Bcos (2
π
f/fs)
θ
(f) = tan
1
(B+1)sin (2
π
f/fs)
1 - B + (B
1)cos (2
π
f/fs)
2) When FIL1 and FIL3 are set to “LPF”
fs: Sampling frequency
fc: Cut-off frequency
f: Input signal frequency
K: Filter gain [dB] (Filter gain of FIL1 should be set to 0dB.)
Register setting
FIL1: F1AS bit = “1”, F1A[13:0] bits =A, F1B[13:0] bits =B
FIL3: F3AS bit = “1”, F3A[13:0] bits =A, F3B[13:0] bits =B
(MSB=F1A13, F1B13, F3A13, F3B13; LSB=F1A0, F1B0, F3A0, F3B0)
1
A = 10
K/20
x
1 + 1 / tan (
π
fc/fs)
B =
1
1 / tan (
π
fc/fs)
1 + 1 / tan (
π
fc/fs)
,
Transfer function
Amplitude
Phase
H(z) = A
1 + z
1
1 + Bz
1
M(f) = A
2 + 2cos (2
π
f/fs)
1 + B
2
+ 2Bcos (2
π
f/fs)
θ
(f) = tan
1
(B
1)sin (2
π
f/fs)
1 + B + (B+1)cos (2
π
f/fs)
相關(guān)PDF資料
PDF描述
AK4643EN Stereo CODEC with MIC/HP/RCV/SPK-AMP
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參數(shù)描述
AK4642VN 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ???￡ Stereo CODEC with MIC/HP/SPK-AMP
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AK4643EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/RCV/SPK-AMP
AK4644 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with built-in MIC/HP/RCV amplifier
AK4644EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/RCV-AMP
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