BU9408KS2_12 Datasheet, PDF (29/57 Pages) Rohm – 32bit Audio DSP with Built-in 4ch DAC and ASRC

BU9408KS2
Technical Note
4-8. Scaler 1
Scaler adjusts the gain in order to prevent the overflow in DSP.
Adjustable range is +24dB to -103dB and can be set by the step of 0.5dB.
Scaler 1 does not incorporate the smooth transition function.
Default = 30h
Select Address
&h24 [ 7:0 ]
Operational explanation
Command
00
01
Gain
+24dB
+23.5dB
30
0dB
31
-0.5dB
32
-1dB
FE
-103dB
FF
-∞
4-9. Pseudo stereo
The sense of stereo is reproduced by signal processing of monaural voice.
Selection of filter effects of pseudo stereo
Default = 0
Select Address
&h71 [ 1:0 ]
Value
0
Operational explanation
Not using of pseudo stereo
1
Gain is set as "high"
2
Gain is set as "low"
If combined with the Surround’s setting of ON (&h70[7] = 1), it will become even wider.
Lch
Lch
Lch PHASE
SHIFTER
EFFECT
GAIN
(High/Low/
OFF）
Rch PHASE
SHIFTER
EFFECT
GAIN
(High/Low/
OFF）
Rch
Rch
4-10. Surround (Matrix Surround 3D)
It realizes the Surround with little feeling of fatigue even after wide seat spot and long-time watching & listening to. It
reproduces the feeling of broadening of the natural sounds in medium & high bands and realizes the sound field that do no
damage to the feeling of locating of the vocal.
If loop is used, then the number of stages of phase shifter can be increased in a pseudo way.
Lch
+ _L-R
-
Loop
+
Lch
+
+
+ _PHASE
EFFECT
SHIFTER
GAIN
LPF
+-
Rch
Rch
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2012.03 - Rev.A