BU9409FV_12 Datasheet, PDF (15/58 Pages) Rohm – 32bit Audio DSP

BU9409FV
Technical Note
4-2. DC Cut HPF
The DC offset component of digital signal inputted to the audio DSP is cut by this HPF.
The cutoff frequency fc of HPF is 1Hz, and first-order filter is used.
Default = 0
Select Address
&h21 [ 0 ]
Value
0
1
Operational explanation
Not using the DC Cut HPF
Using the DC Cut HPF
4-3. Channel mixer
It performs the setting of mixing the sounds of left channel & right channel of digital signal inputted to the audio DSP.
Here the stereo signal is made to be monaural.
The data inputted to Lch of DSP is mixed.
Default = 0
Select Address
&h22 [ 7：6 ]
Value
0
1
2
3
Operational explanation
Inputting the Lch data
Inputting the data of （Lch + Rch） / 2
Inputting the data of （Lch + Rch） / 2
Inputting the Rch data
The data inputted to Rch of DSP is mixed.
Default = 0
Select Address
&h22 [ 5：4 ]
Value
0
1
2
3
Operational explanation
Inputting the Rch data
Inputting the data of （Lch + Rch） / 2
Inputting the data of（Lch + Rch） / 2
Inputting the Lch data
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2012.03 - Rev.A