參數(shù)資料
型號(hào)： AK4645
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)： 40/96頁(yè)
文件大小： 821K
代理商： AK4645
ASAHI KASEI
[AK4645]
MS0543-E-00
2006/09
- 40 -
Digital EQ/HPF/LPF
The AK4645 performs wind-noise reduction filter, stereo separation emphasis, gain compensation and ALC (Automatic
Level Control) by digital domain for A/D converted data (Figure 35). FIL1, FIL3 and EQ blocks are IIR filters of 1
st
order. The filter coefficient of FIL3, EQ and FIL1 blocks can be set to any value. Refer to the section of “ALC operation”
about ALC.
When only DAC is powered-up, digital EQ/HPF/LPF circuit operates at playback path. When only ADC is powered-up
or both ADC and DAC are powered-up, digital EQ/HPF/LPF circuit operates at recording path. Even if the path is
switched from recording to playback, the register setting of filter coefficient at recording remains. Therefore, FIL3, EQ,
FIL1 and GN1-0 bits should be set to “0” if digital EQ/HPF/LPF is not used for playback path.
PMADL bit, PMADR bit
PMDAC bit LOOP bit
0
x
“00”
1
x
0
x
0
Recording & Playback
“01”, “10” or “11”
1
1
Recording Monitor Playback
Note 39. Stereo separation emphasis circuit is effective only at stereo operation.
Table 25. Digital EQ/HPF/LPF Cirtcuit Setting (x: Don’t care)
FIL3 coefficient also sets the attenuation of the stereo separation emphasis.
The combination of GN1-0 bit (Table 26) and EQ coefficient set the compensation gain.
FIL1 and FIL3 blocks become HPF when F1AS and F3AS bits are “0” and become LPF when F1AS and F3AS bits are
“1”, respectively.
When EQ and FIL1 bits are “0”, EQ and FIL1 blocks become “through” (0dB). When FIL3 bit is “0”, FIL3 block become
“MUTE”. When each filter coefficient is changed, each filter should be set to “through” (“MUTE” in case of FIL3).
When MIX bit = “1”, only FIL1 is available. In this case, EQ and FIL3 bits should be set to “0”.
Status
Power-down
Playback
Recording
Digital EQ/HPF/LPF
Power-down
Playback path
Recording path
Recording path
Recording path
Default
FIL3
FIL1
EQ
Gain
ALC
GN1-0
+24/+12/0dB
Any coefficient
F1A13-0
F1B13-0
F1AS
Any coefficient
F3A13-0
F3B13-0
F3AS
Any coefficient
EQA15-0
EQB13-0
EQC15-0
+12dB
～
0dB
0dB
～
-10dB
MUTE
(set by
FIL3 coefficient)
Wind-noise reduction
Stereo separation emphasis
Gain compensation
Figure 35. Digital EQ/HPF/LPF
GN1
0
0
1
Table 26. Gain select of gain block (x: Don’t care)
GN0
0
1
x
Gain
0dB
+12dB
+24dB
Default
相關(guān)PDF資料
PDF描述
AK4646EZ Stereo CODEC with MIC/SPK-AMP
AK4646 Stereo CODEC with MIC/SPK-AMP
AK4646EN Stereo CODEC with MIC/SPK-AMP
AK4647 Stereo CODEC with MIC/HP-AMP
AK4647VN Stereo CODEC with MIC/HP-AMP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4645EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP
AK4645ENP-L 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:
AK4645EZ 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP
AK4646 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with built-in MIC/SPK amplifier
AK4646_11 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP
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