AK4695 Datasheet, PDF (61/107 Pages) Asahi Kasei Microsystems – 24bit 4ch CODEC with MIC/HP/SPK/LINE-AMP

[AK4695]
(4) Dynamic Volume Control
The DVLC automatically controls the volume at the attenuation speed set by DVLMAT2-0 bits (Table 61) or the recovery
speed set by DVRGAIN2-0 bits (Table 62) in such a way that the input moving average level set by DAF1-0 bits (Table 60)
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=48kHz
00
256/fs
32ms
16ms
5.3ms
01
512/fs
64ms
32ms
10.7ms
10
1024/fs 128ms
64ms
21.3ms
11
2048/fs 256ms
128ms
42.7ms
Table 60. DVLC Moving Average Parameter Setting
(default)
DVLMAT2
bit
0
0
0
0
1
1
1
1
DVLMAT1 DVLMAT0
bit
bit
8kHz
ATT Speed
16kHz
48kHz
0
0
1.1dB/s
2.1dB/s
6.4dB/s
0
1
2.1dB/s
4.2dB/s
12.7dB/s
1
0
4.2dB/s
8.5dB/s
25.4dB/s
1
1
8.5dB/s
17.0dB/s 50.9dB/s
0
0
17.0dB/s
33.9dB/s 101.8dB/s
0
1
33.9dB/s
67.9dB/s 203.6dB/s
1
0
67.9dB/s 135.8dB/s 407.4dB/s
1
1
N/A
Table 61. 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
48kHz
0
0
0.07dB/s
0.13dB/s 0.40dB/s
0
1
0.13dB/s
0.27dB/s 0.80dB/s
1
0
0.27dB/s
0.53dB/s 1.60dB/s
1
1
0.53dB/s
1.06dB/s 3.18dB/s
0
0
1.06dB/s
2.12dB/s 6.36dB/s
0
1
2.12dB/s
4.24dB/s 12.7dB/s
1
0
4.24dB/s
8.48dB/s 25.4dB/s
1
1
N/A
Table 62. DVLC Recovery Speed Setting (N/A: Not Available)
(default)
MS1463-E-01
- 61 -
2014/12