AK4679EG Datasheet, PDF (98/220 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with DSP and MIC/RCV/HP/SPK/LINE-AMP

[AK4679]
(4) Dynamic Volume Control
The DVLC automatically controls the volume at the attenuation speed set by DVLMAT2-0 bits (Table 63) or the recovery
speed set by DVRGAIN2-0 bits (Table 64) in such a way that the input moving average level set by DAF1-0 bits (Table 62)
is reached the output level of the DVLC curve set by each frequency range.
DAF1-0 bits
Moving Average Parameter
fs=8kHz fs=16kHz fs=44.1kHz
00
256/fs
32ms
16ms
5.8ms
01
512/fs
64ms
32ms
11.6ms
10
1024/fs 128ms
64ms
23.2ms
11
2048/fs 256ms
128ms
46.4ms (default)
Table 62. DVLC Moving Average Parameter Setting
DVLMAT2
bit
0
0
0
0
1
1
1
1
DVLMAT1 DVLMAT0
ATT Speed
bit
bit
8kHz
16kHz
44.1kHz
0
0
1.1dB/s
2.1dB/s
5.8dB/s
0
1
2.1dB/s
4.2dB/s
11.7dB/s
1
0
4.2dB/s
8.5dB/s
23.4dB/s
1
1
8.5dB/s
17.0dB/s 46.8dB/s
0
0
17.0dB/s
33.9dB/s 93.5dB/s
0
1
33.9dB/s
67.9dB/s 187.1dB/s
1
0
67.9dB/s 135.8dB/s 374.3dB/s
1
1
N/A
Table 63. DVLC ATT Speed Setting (N/A: Not available)
(default)
DVRGAIN2
bit
0
0
0
0
1
1
1
1
DVRGAIN1 DVRGAIN0
bit
bit
Recovery Speed
8kHz
16kHz
44.1kHz
0
0
0.07dB/s
0.13dB/s 0.37dB/s
0
1
0.13dB/s
0.27dB/s 0.73dB/s
1
0
0.27dB/s
0.53dB/s 1.46dB/s
1
1
0.53dB/s
1.06dB/s 2.92dB/s
0
0
1.06dB/s
2.12dB/s 5.84dB/s
0
1
2.12dB/s
4.24dB/s 11.7dB/s
1
0
4.24dB/s
8.48dB/s 23.4dB/s
1
1
N/A
Table 64. DVLC Recovery Speed Setting (N/A: Not available)
(default)
MS1402-E-06
- 98 -
2013/02