[AK4679]
(3-2) Dynamic Volume Control Curve
The inflection points of the DVLC curve is set by three coordinate values (VH1X5-0, VH1Y5-0, VH2X5-0, VH2Y5-0,
VH3X4-0 and VH3Y4-0 bits). The setting of three inflection points are calculated the values of (X1H, Y1H), (X2H,
Y2HH), (X3H, Y3H) in dB. The inflection points should be set in such a way that VH1X ≤ VH2X ≤ VH3X, VH1Y ≤
VH2Y ≤ VH3Y. And the each slope is set by H1G6-0, H2G6-0, H3G6-0 and H4G6-0 bits. X4H is fixed full-scale, Y4H is
calculated by the H4G value. The initial value of the DVLC gain is set by the H1G.
Full scale
(X3H, Y3H)
H3G
(X4H, Y4H)
H4G
(X2H, Y2H)
H2G
(X1H, Y1H)
H1G
(0, 0)
Full scale
DVLC Input Level
Figure 74. DVLC Curve for High Frequency Range
VH1X/Y5-0 bits Dynamic Volume Control Point
Step
VH2X/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 59. DVLC Point Setting for X/Y1, X/Y2 (N/A: Not available)
Dynamic Volume Control Point
VH3X/Y4-0 bits
Step
[dBFS]
0
−1.5
−3.0
:
00H
01H
02H
:
(default)
1.5dB
1EH
1FH
−45.0
−46.5
Table 60. DVLC Point Setting for X/Y3
MS1402-E-06
2013/02
- 96 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
