BD9406KS2 Datasheet, PDF (22/38 Pages) Rohm – 28bit Audio DSP with Built-in 2ch ADC, 6ch DAC and ASRC

BU9406KS2
Technical Note
4-7. P²Treble (Perfect Pure Treble: Mid-/High-range equalizer）
Actualizes clear, crisp and extensive sound.
With sets which have speakers placed near the bottom, the effect will allow the sound to feel “lifted”.
Turning P²Treble Function ON/OFF
Default = 0
Select Address
&h72 [ 6 ]
Value
0
1
SAS function OFF
SAS function ON
Operation Description
P²Treble Mid-/High-Range Gain Configuration
Default = 0
Select Address
&h73 [ 3：0 ]
Command Value
0
1
2
3
4
5
6
7
Operation Description
Gain
+1dB
+2dB
+3dB
+4dB
+5dB
+6dB
+7dB
+8dB
Command Value
8
9
A
B
C
D
E
Gain
+9dB
+10dB
+11dB
+12dB
+13dB
+14dB
+15dB
4-8. Parametric Equalizer
BU9406KS2 has a 2-channel, 12-band parametric equalizer. This is used either to control bass and treble or as an
equalizer to improve the frequency characteristics of speakers.
Data Width:
28 bit
Coefficient: :
24 bit (-4~+4)
The first 5 bands configure common coefficients for both Lch and Rch. They are used chiefly to control tone.
The latter 7 bands are used as independent parametric equalizers for Lch and Rch.
There is a built-in soft transition function to change the audio characteristics while sound is being played back.
The configuration diagrams of Lch and Rch parametric equalizers are on the following page.
Collective Load of Coefficients to Coefficient RAM
Default = 0
Select Address
&h40 [ 7 ]
Value
0
1
Load stop
Load start
Operation Description
Monitor for State of Parametric Equalizer (for read-out)
Select Address
&h46 [ 7 ]
&h46 [ 6 ]
Definition
BUSY signal monitor during coefficient
transition
BUSY monitor during coefficient load
State
Displays “H” during transition
Displays “H” during load
Time Configuration for Soft Transition Completion
Default = 0
Select Address
&h45 [ 5：4 ]
Value
0
1
2
3
21.3ms （1024fs）
42.6ms （2048fs）
10.6ms （512fs）
5.3ms （256fs）
Operation Description
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2012.03 - Rev.A