BU9409FV_12 Datasheet, PDF (31/58 Pages) Rohm – 32bit Audio DSP

BU9409FV
Technical Note
4-12. P²Treble （Perfect Pure Treble：Medium・High-band equalizer）
It realizes good Clearness, sound stretch, and clear-cut manner.
It realizes such an effect that the sound is raised and can be heard when speaker is located on the underside of a device.
ON/OFF of P²Treble function
Default = 0
Select Address
&h75 [ 7 ]
Value
0
1
Operational explanation
Not using of P²Treble function
Using of P²Treble function
Setting of P²Treble smooth transition time
Default = 0
Select Address
&h75 [ 3：2 ]
Value
0
1
2
3
21.4ms
10.7ms
5.4ms
2.7ms
Operational explanation
P²Treble smooth transition control
Default = 0
Select Address
&h78 [ 1：0 ]
Value
0
1
2
Operational explanation
P²Treble smooth transition stop
Setting of the values into Coefficient RAM for P²Treble smooth
transition
P²Treble smooth transitionï¼³tart
What is necessary is the time of waiting, which is more than the time selected by the setting of P²Treble smooth transition
time, from the time the P²Treble smooth transition start（&h78[1:0] = “2”） is executed until the following command is sent.
Please make sure to perform the P²Treble smooth transition stop（&h78[1:0] = “0”）after the smooth transition is completed.
Setting of P²Treble medium・high-band gain
Default = 0h
Select Address
&h76 [ 7：4 ]
Operational explanation
Command
0
1
2
3
4
5
6
7
Gain
0dB
+1dB
+2dB
+3dB
+4dB
+5dB
+6dB
+7dB
Command
8
9
A
B
C
D
E
F
Gain
+8dB
+9dB
+10dB
+11dB
+12dB
+13dB
+14dB
+15dB
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2012.03 - Rev.A