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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)： | 44/82頁 |
| 文件大小： | 688K |
| 代理商： | AK4633 |
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ASAHI KASEI
[AK4633]
MS0447-E-03
2006/04
- 44 -
ALC Operation
ALC Operation works in ALC block. When ADCPF bit =
“
1
”
, ALC operation is enable for recording path. When
ADCPF bit =
“
0
”
, ALC operation is enable for playback path. The ON/OFF of ALC operation for recording is controlled
by ALC1 bit and the ON/OFF of ALC operation for playback is controlled by ALC2 bit.
1. ALC Limiter Operation
When the ALC limiter is enabled, and output exceeds the ALC limiter detection level (Table 23), the volume value is
attenuated by the amount defined in LMAT1-0 bits(Table 24) automatically.
When the ZELMN bit =
“
0
”
(zero crossing detection valid), the VOL value is changed by ALC limiter operation at the
zero crossing point or zero crossing timeout. Zero crossing timeout period is set by ZTM1-0 bit that in common with ALC
recovery zero crossing timeout period’s setting (Table 25).
When the ZELMN bit =
“
1
”
(zero crossing detection invalid), VOL value has been changed immediately (period: 1/fs) by
ALC limiter operation. The attenuation for limiter operation is fixed to 1 step and not controlled by setting LMAT1-0 bits.
After finishing the attenuation operation, if ALC bit does not change to
“
0
”
, the operation repeats when the output signal
level exceeds the ALC limiter detection level.
LMTH1
LMTH0 ALC Limiter Detection Level
ALC Recovery Waiting Counter Reset Level
0
0
ALC Output
≥
2.5dBFS
0
1
ALC Output
≥
4.1dBFS
1
0
ALC Output
≥
6.0dBFS
1
1
ALC Output
≥
8.5dBFS
Table 23. ALC Limiter Detection Level / Recovery Waiting Counter Reset Level
ALC1 Limiter ATT Step
LMAT1
LMAT0
ALC1 Output
≥
LMTH
0
0
1
0
1
2
1
0
2
1
1
1
Table 24. ALC Limiter ATT Step Setting
Zero Crossing Timeout Period
ZTM1
ZTM0
8kHz
0
0
128/fs
16ms
0
1
256/fs
32ms
1
0
512/fs
64ms
1
1
1024/fs
128ms
Table 25. ALC Zero Crossing Timeout Period Setting
Default
2.5dBFS > ALC Output
≥
4.1dBFS
4.1dBFS > ALC Output
≥
6.0dBFS
6.0dBFS > ALC Output
≥
8.5dBFS
8.5dBFS > ALC Output
≥
12dBFS
ALC1 Output
≥
FS
1
2
4
2
ALC1 Output
≥
FS + 6dB
1
2
4
4
ALC1 Output
≥
FS + 12dB
1
2
8
8
Default
Default
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
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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