參數(shù)資料
型號： AK4665AEN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 20-Bit Stereo CODEC with MIC/HP-AMP
中文描述： 20位立體聲編解碼器麥克風(fēng)/惠普腺苷
文件頁數(shù)： 18/52頁
文件大小： 541K
代理商： AK4665AEN
ASAHI KASEI
[AK4665A]
MS0440-E-01
2006/05
- 18 -
ALC1 Operation (MIC-ALC)
The ALC1 (Automatic Level Control) is done by ALC1 block when ALC1 bit is “1”.
1. ALC1 Limiter Operation
During the ALC1 limiter operation, when either Lch or Rch exceeds the ALC1 limiter detection level (LMTH1-0 bits:
Table 9), the IVOL value (same value for Lch and Rch) is attenuated automatically by the ALC1 limiter ATT step
(LMAT1-0 bits: Table 10).
When ZELMN bit is “0” (zero crossing detection is enabled), the IVOL value is changed by the ALC1 limiter operation
at the individual zero crossing points of Lch and Rch or at the zero crossing timeout. ZTM1-0 bits set the zero crossing
timeout period of both the ALC1 limiter and recovery operation (Table 11).
When ZELMN bit is “1” (zero crossing detection is disabled), the IVOL value is immediately (period: 1/fs) changed by
the ALC1 limiter operation. Attenuation step is fixed to 1 step regardless as the setting of LMAT1-0 bits.
After completing the attenuation operation, unless ALC1 bit is changed to “0”, the operation repeats when the input signal
level exceeds ALC1 limiter detection level.
LMTH1
LMTH0 ALC1 Limier Detection Level
ALC1 Recovery Waiting Counter Reset Level
0
0
ALC1 Output
≥
4.1dBFS
0
1
ALC1 Output
≥
6.0dBFS
1
0
ALC1 Output
≥
8.5dBFS
1
1
ALC1 Output
≥
10.1dBFS
Table 9. ALC1 Limiter Detection Level / Recovery Waiting Counter Reset Level
ZELMN
LMAT1
LMAT0
0
0
0
1
1
0
1
1
1
x
x
Table 10. ALC1 Limiter ATT Step (x: Don’t care)
ALC1 Zero Cross Timeout
FS3
FS2
FS1
FS0
ZTM=00
(Default)
0
0
0
0
384/fs (8.7ms)
768/fs (17.4ms)
0
0
0
1
256/fs (8.0ms)
512/fs (16.0ms)
0
0
1
0
384/fs (8.0ms)
768/fs (16.0ms)
1
0
0
0
192/fs (8.7ms)
384/fs (17.4ms)
1
0
0
1
128/fs (8.0ms)
256/fs (16.0ms)
1
0
1
0
192/fs (8.0ms)
384/fs (16.0ms)
1
1
0
0
96/fs (8.7ms)
192/fs (17.4ms)
1
1
0
1
64/fs (8.0ms)
128/fs (16.0ms)
1
1
1
0
96/fs (8.0ms)
192/fs (16.0ms)
Others
Table 11. ALC1 Zero Crossing Timeout Period
Default
4.1dBFS > ALC1 Output
≥
6.0dBFS
6.0dBFS > ALC1 Output
≥
8.5dBFS
8.5dBFS > ALC1 Output
≥
12dBFS
10.1dBFS > ALC1 Output
≥
14.5dBFS
ALC1 Limiter ATT Step
1 step
2 step
4 step
8 step
1 step
Default
0.375dB
0.750dB
1.500dB
3.000dB
0.375dB
0
ZTM=01
ZTM=10
ZTM=11
1536/fs (34.8ms)
1024/fs (32.0ms)
1536/fs (32.0ms)
768/fs (34.8ms)
512/fs (32.0ms)
768/fs (32.0ms)
384/fs (34.8ms)
256/fs (32.0ms)
384/fs (32.0ms)
N/A
3072/fs (69.7ms) Default
2048/fs (64.0ms)
3072/fs (64.0ms)
1536/fs (69.7ms)
1024/fs (64.0ms)
1536/fs (64.0ms)
768/fs (69.7ms)
512/fs (64.0ms)
768/fs (64.0ms)
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