
ASAHI KASEI
[AK4343]
MS0478-E-01
2006/10
- 40 -
ALC Operation
The ALC (Automatic Level Control) is done by ALC block when ALC bit is “1”.
1. ALC Limiter Operation
During the ALC limiter operation, when either Lch or Rch exceeds the ALC limiter detection level (Table 24), the AVL
and AVR values (same value) are attenuated automatically by the amount defined by the ALC limiter ATT step (Table
25).
When ZELMN bit = “0” (zero cross detection is enabled), the AVL and AVR values are changed by ALC 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 ALC limiter and recovery operation (Table 26).
When ZELMN bit = “1” (zero cross detection is disabled), AVL and AVR values are immediately (period: 1/fs) changed
by ALC limiter operation. Attenuation step is fixed to 1 step regardless as the setting of LMAT1-0 bits.
The attenuation operation is done continuously until the input signal level becomes ALC limiter detection level (Table 24)
or less. After completing the attenuation operation, unless ALC bit is changed to “0”, the operation repeats when the input
signal level exceeds LMTH1-0 bits.
LMTH1
LMTH0 ALC Limier 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 24. ALC Limiter Detection Level / Recovery Counter Reset Level
ZELMN
LMAT1
LMAT0
0
0
0
1
1
0
1
1
1
x
x
Table 25. ALC Limiter ATT Step (x: Don’t care)
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 26. ALC Zero Crossing Timeout Period
Default
2.5dBFS > ALC Output
≥
4.1dBFS
4.1dBFS > ALC Output
≥
6.0dBFS
6.0dBFS > ALC Output
≥
8.5dBFS
8.5dBFS > ALC Output
≥
12dBFS
ALC Limiter ATT Step
1 step
2 step
4 step
8 step
1step
Default
0.375dB
0.750dB
1.500dB
3.000dB
0.375dB
0
Default
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms