參數(shù)資料
型號(hào)： AK5700VN
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 16-Bit ツヒ Mono ADC with PLL & MIC-AMP
中文描述： 16位ツヒ單聲道ADC，帶鎖相環(huán)
文件頁(yè)數(shù)： 35/61頁(yè)
文件大?。?/td> 519K
代理商： AK5700VN
ASAHI KASEI
[AK5700]
MS0569-E-01
2006/12
- 35 -
2. ALC Recovery Operation
The ALC recovery operation waits for the WTM1-0 bits (Table 25) to be set after completing the ALC limiter operation.
If the input signal does not exceed “ALC recovery waiting counter reset level” (Table 22) during the wait time, the ALC
recovery operation is done. The IVL value is automatically incremented by RGAIN1-0 bits (Table 26) up to the set
reference level (Table 27) with zero crossing detection which timeout period is set by ZTM1-0 bits (Table 24). The ALC
recovery operation is done at a period set by WTM1-0 bits. If ZTM1-0 is longer than WTM1-0 and no zero crossing
occurs, the ALC recovery operation is done at a period set by ZTM1-0 bits.
For example, when the current IVOL value is 30H and RGAIN1-0 bits are set to “01”, IVOL 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 IVOL value exceeds
the reference level (REF7-0), the IVOL 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.
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 25. ALC Recovery Operation Waiting Period
RGAIN1
RGAIN0
0
0
1 step
0
1
2 step
1
0
3 step
1
1
4 step
Table 26. ALC Recovery GAIN Step
REF7-0
GAIN(dB)
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
E2H
+30.375
E1H
+30.0
E0H
+29.625
:
:
03H
53.25
02H
53.625
01H
54.0
00H
MUTE
Table 27. Reference Level at ALC Recovery operation
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
Step
Default
0.375dB
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