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參數(shù)資料
| 型號： | AK4650VG |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
| 中文描述： | 16位ツヒ編解碼器麥克風/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁數(shù)： | 30/86頁 |
| 文件大小： | 824K |
| 代理商： | AK4650VG |
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[AK4650]
MS0502-E-01
2007/04
- 30 -
(2)
ALC1 Recovery Operation
The ALC1 recovery refers to the amount of time that the AK4650 will allow a signal to exceed a predetermined limiting
value prior to enabling the limiting function. The ALC1 recovery operation uses the WTM1-0 bits to define the wait
period used after completing an ALC1 limiter operation (Table 19). If the input signal does not exceed the “ALC1
Recovery Waiting Counter Reset Level” (LMTH: Table 15), the ALC1 recovery operation starts. The IPGA value
increases automatically by the recovery gain step (RGAIN bit: Table 20) with zero crossing operation (timeout is set by
ZTM1-0: Table 18) during this operation up to the reference level (REF5-0 bit: Table 21). The ALC1 recovery operation
is done at a period set by the WTM1-0 bits. Zero crossing is detected during WTM1-0 period, the ALC1 recovery
operation waits WTM1-0 period and the next recovery operation starts.
During the ALC1 recovery operation, when input signal level exceeds the ALC1 limiter detection level (LMTH), the
ALC1 recovery operation changes immediately into an ALC1 limiter operation.
In the case of
(Recovery waiting counter reset level)
≤
(IPGA Output Level) < (Limiter detection level)
during the ALC1 recovery operation, the wait timer for the ALC1 recovery operation is reset. Therefore, in the case of
(Recovery waiting counter reset level) > (IPGA Output Level),
the wait timer for the ALC1 recovery operation starts.
The ALC1 operation corresponds to the impulse noise. When the impulse noise is input, the ALC1 recovery operation
becomes faster than a normal recovery operation.
ALC1 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 19. ALC1 Recovery Operation Waiting Period
RGAIN
GAIN STEP
0
0.5dB
1
1.0dB
Table 20. ALC1 Recovery Gain Step Setting
REF5-0
GAIN (dB)
3DH
+26.5
3CH
+26.0
:
:
2DH
+19.0
:
:
05H
+0.5
04H
+0.0
03H
1.0
02H
2.0
:
:
01H
7.0
00H
8.0
Table 21. Setting Reference Value at ALC1 Recovery Operation
(default)
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
(default)
STEP
(default)
0.5dB
1.0dB
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| AK4651VG | 16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4665A | 20-Bit Stereo CODEC with MIC/HP-AMP |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AK4651 | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4651VG | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP |
| AK4664VQ | 功能描述:IC CODEC STEREO 20BIT LQFP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時間 標準包裝:1,000 |
| AK4665A | 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP |
| AK4665AEN | 制造商:AKM 制造商全稱:AKM 功能描述:20-Bit Stereo CODEC with MIC/HP-AMP |
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