LM4934 Datasheet, PDF (17/39 Pages) National Semiconductor (TI) – 3D Audio Sub-System with Stereo Speaker, OCL/SE Stereo Headphone, Earpiece and Mono Line Level Outputs

System Control (Continued)
Loudspeaker Left Channel
TABLE 9. Output Control (01h)
LS_L_OUTPUT = 1
Output On
LS_L_OUTPUT = 0
Output Off
Loudspeaker Right Channel
LS_R_OUTPUT = 1
Output On
LS_R_OUTPUT = 0
Output Off
Headphone Left Channel
HP_L_OUTPUT = 1
Output On
HP_L_OUTPUT = 0
OCL = 1, Output Mute OCL = 0, Output Mute
Headphone Right Channel
HP_R_OUTPUT = 1
Output On
HP_R_OUTPUT = 0
OCL = 1, Output Mute OCL = 0, Output Mute
Mono Speaker Output
MONO_OUTPUT = 1
Output On
MONO_OUTPUT = 0
Output Off
Lineout
LINEOUT_OUTPUT = 1
Output On
LINEOUT_OUTPUT = 0
Output Mute
Headphone Output Mode
All Outputs
OCL = 1
Headphone Output set to Capless
(CHP = 1/2 AV_DD)
CD3 = 1
Outputs Toggled Via Register Control
OCL = 0
Headphone Output Set to Cap-coupled
CD3 = 0
All Outputs Off
3D_LEVEL_1
0
0
1
1
TABLE 10. National 3D Enhancement Level Select (03h)
3D_LEVEL_0
0
1
0
1
MIX RATIO
25%
40%
55%
70%
TABLE 11. National 3D Mode Control (04h)
3D_MODE
0
1
3D type 1: R_OUT = R_i - G * L_OUT3D, L_OUT = L_i - G * R_OUT3D
3D type 2: R_OUT = −R_i - G * L_OUT3D, L_OUT = L_i + G * R_OUT3D
R_i = Right Input
L_i = Left Input
G = 3D gain level (Mix Ratio)
R_OUT3D = R_i through the high-pass filter R_3D and C_3D
L_OUT3D = L_i through the high-pass filter R_3D and C_3D
MODE
3D type 1
3D type 2
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