[AK4634]
5. Example of ALC for Playback Operation
Table 35 shows the example of the ALC setting for playback.
fs=8kHz
Operation
fs=16kHz
Operation
Register Name Comment
Data
01
0
Data
01
0
LMTH1-0
ZELM
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM1-0 bits should be more than or
equal to ZTM1-0 bits
−4.1dBFS
Enable
16ms
−4.1dBFS
Enable
16ms
ZTM1-0
00
01
WTM2-0
000
16ms
001
16ms
OREF5-0
OVOL7-0
LFST
LMAT1-0
RGAIN1-0
ALC2
Maximum gain at recovery operation
Gain of IVOL
Fast Limiter Operation
Limiter ATT step
Recovery GAIN step
ALC enable
28
91
1
00
00
1
+6dB
0dB
ON
1step
1 step
Enable
4 times
28
91
1
00
00
1
+6dB
0dB
ON
1step
1 step
Enable
4 times
FRSL1-0
Speed of Fast Recovery
00
00
Table 35. Examples of the ALC Setting (Play back)
Rev. 0.5
2007/10
- 47 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
