參數(shù)資料
型號： AK4633
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16-Bit Mono CODEC with ALC & MIC/SPK-AMP
中文描述： 16位單聲道編解碼器ALC的
文件頁數(shù)： 41/82頁
文件大小： 688K
代理商： AK4633
ASAHI KASEI
[AK4633]
MS0447-E-03
2006/04
- 41 -
Digital Programmable Filter
The AK4633 have 2steps of 1st order HPF and 2 band Equalizer for recording and playback path (Figure 32).
(1) High Pass Filter (HPF)
Normally, this HPF is used for a Wind-Noise Reduction Filter. This is composed with 2 steps of 1st order HPF. The
coefficient of both HPF is same and should be set by F1A13-0 bits and F1B13-0 bits. The HPF of ADC could be ON/OFF
by HPFAD bit, and the HPF before 2 band EQ could be ON/Off by setting HPF bit. When the HPF is OFF, the audio data
passes this block by 0dB . The coefficient should be set when HPFAD bit = HPF bit =
“
0
”
or PMADC bit = PMPFIL bit
=
“
0
”
. After changing the coefficient, the HPF starts with 3/fs (max) delay time after (HPFAD bit and PMADC bit) or
(HPF bit and PMPFIL bit) are set to
“
1
”
. The waiting time is not necessity for setting HPFAD bit, HPF bit, PMADC bit
and PMPFIL bit to
“
1
”
after setting the coefficient.
fs: Sampling frequency
fc: Cut-off frequency
Register setting (Note 29)
HPF: F1A[13:0] bits =A, F1B[13:0] bits =B
(MSB=F1A13, F1B13; LSB=F1A0, F1B0)
1
B =
1 + tan (
π
fc/fs)
A =
1 + tan (
π
fc/fs)
1
tan (
π
fc/fs)
,
The cut-off frequency should be set as below.
fc/fs
≥
0.0001 (fc min = 1.6Hz at 16kHz)
(2) 2 band Equalizer
This could be used as Equalizer or notch filter. 2 band Equalizer (EQ1 and EQ2) are ON/OFF independently by EQ1 bit
and EQ2 bit. When Equalizer is OFF, the audio data passes this block by 0dB. The coefficient of EQ1 should be set by
E1A15-0 bits, E1B15-0 bits and E1C15-0 bits, the coefficient of EQ2 should be set by E2A15-0 bits, E2B15-0 bits and
E2C15-0 bits. The EQ1 coefficient should be set when EQ1 bit =
“
0
”
or PMPFIL bit =
“
0
”
, the EQ2 coefficient should be
set when EQ2 bit =
“
0
”
or PMPFIL bit =
“
0
”
. After changing the coefficient, the Equalizer starts with 3/fs (max) delay
time after (EQ1 bit and PMPFIL bit) or (EQ2 bit and PMPFIL bit) are set to
“
1
”
. The waiting time is not necessity for
setting EQ1 bit, EQ2 bit and PMPFIL bit to
“
1
”
after setting the coefficient.
fs: Sampling frequency
fo: Center frequency
fb: Band width of 3dB gain difference from center frequency
K : Gain ( -1
≤
K
<
3 )
Register setting(Note 29)
EQ1: E1A[15:0] bits =A, E1B[15:0] bits =B, E1C[15:0] bits =C
EQ2: E2A[15:0] bits =A, E2B[15:0] bits =B, E2C[15:0] bits =C
(MSB=E1A15, E1B15, E1C15, E2A15, E2B15, E2C15 ; LSB= E1A0, E1B0, E1C0, E2A0, E2B0, E2C0)
A = K x
1 + tan (
π
fb/fs)
1 + tan (
π
fb/fs)
tan (
π
fb/fs)
B = cos(2
π
fo/fs) x
2
,
C =
1
tan (
π
fb/fs)
1 + tan (
π
fb/fs)
,
The center frequency should be set as below.
fo/fs <
0.497
相關(guān)PDF資料
PDF描述
AK4640 16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4640VG 16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4640VN 16BIT CODEC WITH MIC /HP/SPK-AMPl
AK4642EN Stereo CODEC with MIC/HP/SPK-AMP
AK4643EN Stereo CODEC with MIC/HP/RCV/SPK-AMP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4633ENP-L 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:LOW COST MONO CODEC WITH SPK A
AK4633VN 制造商:AKM 制造商全稱:AKM 功能描述:16bit mono CODEC with MIC/SPK amplifier.
AK4633VNP-L 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:LOW COST MONO CODEC WITH SPK A
AK4634 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP
AK4635 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP
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