ASAHI KASEI
[AK4564]
ALC Mode Control 1
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
07H ALC Mode Control 1
Default
0
0
GSEL
0
RGAIN1 RGAIN0 LMAT1 LMAT0
FDATT1 FDATT0
0
0
0
0
0
0
LMAT1-0: ALC1 Limiter ATT Step
The IVOL value is attenuated when the input signal exceeds the ALC1 limiter detection level. The number
of step to attenuate is decided by output level.
ALC1Limiter ATT Step
LMAT1
LMAT0
ALC1 Output ALC1 Output ALC1 Output ALC1 Output
³ LMTH
³ FS
³ FS + 6dB
³ FS + 12dB
0
0
1
1
0
1
0
1
1
2
2
2
1
2
2
4
1
2
4
4
1
2
4
8
Default
Table 18. ALC1 Limiter ATT Step
RGAIN1-0: ALC1 Recovery GAIN Step
During the ALC1 recovery operation, the number of steps changed from current IVOL value is set. For
example, when the current IVOL value is 30H, RGAIN1-0= “01” are set, IVOL changes to 32H by the
auto limiter operation, 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 value does not increase.
RGAIN1
RGAIN0
GAIN STEP
Default
0
0
1
1
0
1
0
1
1
2
3
4
Table 19. ALC1 Recovery GAIN Step
FDATT1-0: FADEIN/OUT ATT Step Setting
During the FADEIN/OUT operation, the number of steps changed from current IVOL value is set.
FDATT1
FDATT0
ATT STEP
Default
0
0
1
1
0
1
0
1
1
2
3
4
Table 20. FADEIN/OUT ATT Step Setting
GSEL: Select IVOL gain
0: MIC (Default)
1: LINE
MS0140-E-01
2002/07
- 40 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
