msm9811 Oki Semiconductor, msm9811 Datasheet - Page 28

• Manufacturer Part Number: msm9811
• Description: 4-channel Mixing Oki Adpcm Type Voice Synthesis Lsi
• Manufacturer: Oki Semiconductor

Volume Function
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The output level attenuations when the CVOL, OPT and PAN commands are executed are shown below.
<Left-side output volume calculation>
Left-side output volume = (V + L) × –2 + (O4 × 2 + O3) × –6 [dB]
<Right-side output volume calculation>
Right-side output volume = (V + L) x –2 + (O4 × 2 + O3) × –6 [dB]
OKI Semiconductor
A volume can be adjusted at the stages of OPT, CVOL and PAN as shown below.
A volume is set to all channels at the stage of OPT.
A volume is set to each channel at the stage of CVOL.
A volume is set to “L” and “R” of each channel at the stage of PAN.
ADPCM
Block
V:
L:
O4, O3: Setting a volume (0 or 1) with the OPT command
V:
L:
O4, O3: Setting a volume (0 or 1) with the OPT command
Setting a volume (0 to 15) with the CVOL command
Setting a left-side volume (0 to 15) with the PAN command
Setting a volume (0 to 15) with the CVOL command
Setting a right-side volume (0 to 15) with the PAN command
OPT
CVOL
CVOL
CVOL
CVOL
CH1
CH2
CH3
CH4
PAN[R]
PAN[R]
PAN[R]
PAN[R]
PAN[L]
PAN[L]
PAN[L]
PAN[L]
Left-side
Mixing
Mixing
Right-
Block
Block
side
FEDL9811FULL-04
Left-side
Output
Output
Right-
side
MSM9811
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