參數(shù)資料
型號(hào)： AK4673EG
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
中文描述： 立體聲編解碼器麥克風(fēng)/惠普- AMP及觸摸屏控制器
文件頁(yè)數(shù)： 43/107頁(yè)
文件大?。?/td> 1171K
代理商： AK4673EG
[AK4673]
MS0670-E-00
2007/09
- 43 -
■
Digital EQ/HPF/LPF
The AK4673 has a wind-noise reduction filter, stereo separation emphasis, gain compensation and ALC (Automatic
Level Control) by digital domain for A/D converted data (
Figure 34
). 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 Circuit Setting (x: Don’t care)
FIL3 coefficient also sets the attenuation of the stereo separation emphasis.
The combination of GN1-0 bits (
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 34. 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)
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