參數(shù)資料
型號(hào)： 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)： 45/82頁
文件大小： 688K
代理商： AK4633
ASAHI KASEI
[AK4633]
MS0447-E-03
2006/04
- 45 -
2. ALC Recovery Operation
The ALC recovery operation waits for the WTM1-0 bits(Table 26) to be set after completing the ALC limiter operation.
If the input signal does not exceed
“
ALC recovery waiting counter reset level
”
(Table 23) during the wait time, the ALC
recovery operation is done. The VOL value is automatically incremented by RGAIN1-0 bits (Table 27) up to the set
reference level(Table 28, Table 29) with zero crossing detection which timeout period is set by ZTM1-0 bits (Table 25).
The ALC recovery operation is done at a period set by WTM1-0 bits.
For example, when the current VOL value is 30H and RGAIN1-0 bits are set to
“
01
”
(2 steps), VOL is changed to 32H by
the auto limiter operation and then the input signal level is gained by 0.75dB (=0.375dB x 2). When the VOL value
exceeds the reference level (IREF7-0 or OREF5-0), the VOL values are not increased.
When
“
ALC recovery waiting counter reset level (LMTH1-0)
≤
Output Signal < ALC limiter detection level (LMTH1-0)
”
during the ALC recovery operation, the waiting timer of ALC recovery operation is reset. When
“
ALC recovery waiting counter reset level (LMTH1-0) > Output Signal
”
,
the waiting timer of ALC recovery operation starts.
The ALC operation corresponds to the impulse noise. When the impulse noise is input, the ALC recovery operation
becomes faster than a normal recovery operation. When large noise is input to microphone instantaneously, the quality of
small level in the large noise can be improved by this fast recovery operation. The speed of first recovery operation is set
by RFST1-0 bits(Table 30).
ALC Recovery Operation Waiting Period
WTM1
WTM0
8kHz
0
0
128/fs
16ms
0
1
256/fs
32ms
1
0
512/fs
64ms
1
1
1024/fs
128ms
Table 26. ALC Recovery Operation Waiting Period
RGAIN1
RGAIN0
0
0
1
0
1
2
1
0
3
1
1
4
Table 27. ALC Recovery GAIN Step
Default
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
GAIN STEP
Default
0.375dB
0.750dB
1.125dB
1.500dB
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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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