[AK4679]
(2-3) Dynamic Volume Control Curve
The inflection points of the DVLC curve is set by three coordinate values (VM1X5-0, VM1Y5-0, VM2X5-0, VM2Y5-0,
VM3X4-0 and VM3Y4-0 bits). The setting of three inflection points are calculated the values of (X1M, Y1M), (X2M,
Y2M), (X3M, Y3M) in dB. The inflection points should be set in such a way that VM1X ≤ VM2X ≤ VM3X, VM1Y ≤
VM2Y ≤ VM3Y. And the each slope is set by M1G6-0, M2G6-0, M3G6-0 and M4G6-0 bits. X4M is fixed full-scale, Y4M
is calculated by the M4G value. The initial value of the DVLC gain is set by the M1G. When the HPF and LPF is bypass
(DMHPF1-0 = DMLPF1-0 bits = “00”), the audio data passes this block by 0dB gain.
Full scale
(X3M, Y3M)
(X2M, Y2M)
(X4M, Y4M)
M4G
M3G
M2G
(X1M, Y1M)
M1G
(0, 0)
Full scale
DVLC Input Level
Figure 72. DVLC Curve for Middle Frequency Range
VM1X/Y5-0 bits Dynamic Volume Control Point
Step
VM2X/Y5-0 bits
[dBFS]
00H
01H
02H
:
0
(default)
−1.5
−3.0
:
1.5dB
2EH
2FH
30H
:
−69.0
−70.5
N/A
:
N/A
3FH
N/A
Table 55. DVLC Point Setting for X/Y1, X/Y2 (N/A: Not available)
Dynamic Volume Control Point
VM3X/Y4-0 bits
Step
[dBFS]
0
−1.5
−3.0
:
00H
01H
02H
:
(default)
1.5dB
1EH
1FH
−45.0
−46.5
Table 56. DVLC Point Setting for X/Y3
MS1402-E-06
2013/02
- 93 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
