BU9409FV_12 Datasheet, PDF (17/58 Pages) Rohm – 32bit Audio DSP

BU9409FV
Technical Note
Setting of K
P2V_K sets the slop of D range. It sets the P2V_MAX = “1Eh”（-30dB） and represents the output level V_Ｏmax at the time of
input level V_I = 0dB.
Default = 00h
Select Address
&h36 [ 3:0 ]
Operational explanation
command
0
1
2
3
4
5
6
7
gain
-30dB
-28dB
-26dB
-24dB
-22dB
-20dB
-18dB
-16dB
comman
8
9
A
B
C
D
E
F
gain
-14dB
-12dB
-10dB
-8dB
-6dB
-4dB
-2dB
0dB
Setting of α
P2V_OFS makes small voice easy to be heard because the whole output level is lifted.
Default = 00h
Select Address
&h37 [ 4:0 ]
command
00
01
02
03
04
05
06
07
gain
0dB
+1dB
+2dB
+3dB
+4dB
+5dB
+6dB
+7dB
Operational explanation
command
08
09
0A
0B
0C
0D
0E
0F
gain
+8dB
+9dB
+10dB
+11dB
+12dB
+13dB
+14dB
+15dB
command
10
11
12
13
14
15
16
17
gain
+16dB
+17dB
+18dB
+19dB
+20dB
+21dB
+22dB
+23dB
command
18
19
1A
1B
1C
1D
1E
1F
gain
+24dB
-
-
-
-
-
-
-
Setting 1 of transition time at the time of attack
A_RATE is the setting of transition time when the state of P²Volume function is transited to (2)→(3).
Default = 0
Select Address
&h38 [ 6:4 ]
Operational explanation
command
0
1
2
3
A_RATE time
1ms
2ms
3ms
4ms
command
4
5
6
7
A_RATE time
5ms
10ms
20ms
40ms
Setting 1 of transition time at the time of recovery
R_RATE is the setting of transition time when the state of P²Volume function is transited to (3)→(2).
Default = 0h
Select Address
&h38 [ 3:0 ]
Operational explanation
command
0
1
2
3
4
5
6
7
R_RATE time
0.25s
0.5s
0.75s
1s
1.25s
1.5s
2s
2.5s
command
8
9
A
B
C
D
E
F
R_RATE time
3s
4s
5s
6s
7s
8s
9s
10s
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17/54
2012.03 - Rev.A