BU9408KS2_12 Datasheet, PDF (21/57 Pages) Rohm – 32bit Audio DSP with Built-in 4ch DAC and ASRC

BU9408KS2
Explanation of A_RATE_Low,R_RATE_Low(field transition of (1)<->(2))
VImin
Input V_I
Tme T
Field(1)
VOmin
Output V_O
Field(2)
Field(1)
Time T
Technical Note
Recovery operation
R_RATE_Low
The time from falling
below the recovery
operation detection level
oVp^Ie^mraⁱtⁿion'^tsill
the recovery
transition to
Field (2) is completed
Attack operation
A_RATE_Low
The time from exceeding
the attack operation
adtettaeccktioonpelreavteiol nV's^Imtⁱrⁿantisllittiohen
to Field (1) is completed
Setting 2 of the transition time at the time of attack
A_RATE_LOW is the setting of transition time when the state of P²Volume function is transited to (2)→(1).
Default = 0
Select Address
Operational explanation
&h3A [ 6:4 ]
Command A_RATE_LOW Time Command A_RATE_LOW Time
0
1ms
4
5ms
1
2ms
5
10ms
2
3ms
6
20ms
3
4ms
7
40ms
Setting 2 of the transition time at the time of recovery
R_RATE_LOW is the setting of transition time when the state of P²Volume function is transited to (1)→(2).
Default = 0 (Caution) This setting value is not reflected in BU9408KS2. The value of &h38 [3:0] is set up.
Select Address
Operational explanation
&h3A [ 2:0 ]
Command R_RATE_LOW Time Command R_RATE_LOW Time
0
1ms
4
5ms
1
2ms
5
10ms
2
3ms
6
20ms
3
4ms
7
40ms
Setting 2 of attack recovery detection time
AR_TIME_LOW is the setting of the initiation of P²Volume function’s transition operation. If output level at the time of
transiting to (1)<->(2) continues for more then AR_TIME time in succession, then the state transition of P²Volume is started.
Default = 0
Select Address
Operational explanation
&h3B [ 6:4 ]
Command
0
1
2
3
AR_TIME_LOW
0.5ms
1ms
1.5ms
2ms
Command
4
5
6
7
AR_TIME_LOW
3ms
4ms
5ms
6ms
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21/53
2012.03 - Rev.A