BU9414FV Datasheet, PDF (20/61 Pages) Rohm – 32bit Audio DSP

BU9414FV
Technical Note
Setting 3 of attack recovery detection time
R_TIME_LOW is the setting of the initiation of P²Volume function’s transition operation. If the input level above A continues
more than continuation R_TIME_LOW in the state of (1), state transition of P2Volume will be started toward the state of (2)
or (3).
Default = 0
Select Address
Operational explanation
&h3B [ 6:4 ]
Command
0
1
2
3
R_TIME_LOW
0.5ms
1ms
1.5ms
2ms
Command
4
5
6
7
R_TIME_LOW
3ms
4ms
5ms
6ms
○Scene change detection and High-speed recovery function（functioning only at the time of transition of (2)<->(3)）
P²Volume function makes the P²Volume also compatible with large pulse sounds (clapping of hands, fireworks & shooting
etc.) in addition to normal P²Volume operation. When large pulse sound is inputted, attack operation (A_RATE) or recovery
operation (R_RATE) is performed at 4 or 64 times the speed of normal attack operation or recovery operation.
Selection of using the scene change detection function.
Default = 0
Select Address
&h3C[ 7 ]
Value
0
1
Operational explanation
Not using of pulse sound detection function
Using of pulse sound detection function
Selection of operating times of Recovery Time (R_RATE) in the case of using the scene change detection function.
(Operating-time selection at the time of R_RATE / scene detection) serves as a recovery time.
Default = 0
Select Address
&h3D [ 1:0 ]
Value
Operational explanation
Command
Value
0
4
1
8
2
16
3
64
Selection of scene change detection time
Default = 0
Select Address
&h3C [ 6:4 ]
Command
0
1
2
3
Operational explanation
Time
50ms
100ms
150ms
200ms
Command
4
5
6
7
Time
300ms
400ms
500ms
600ms
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20/57
2012.03 - Rev.A