STAC9758 Datasheet, PDF (67/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
8.2.17. 3D Control (22h)
Default: 0000h
D15
D14
D13
D7
D6
D5
RESERVED
D12
D11
D10
RESERVED
D4
D3
D2
DP3
DP2
D9
D8
D1
D0
RESERVED
Bit(s) Reset Value R/W Name
Description
15:4
0
RO RESERVED Bits not used, should read back 0
LINE_OUT SEPARATION RATIO
DP3 DP2 effect
3:2
0
RW DP3,DP2
0
0
0
1
0 ( OFF )
3 ( LOW )
1 0 4.5 ( MED )
11
6 ( HIGH )
1:0
0
RO RESERVED Bits not used, should read back 0
This register is used to control the 3D stereo enhancement function, IDT Surround 3D (SS3D), built
into the AC'97 component. Note that register bits DP3-DP2 are used to control the separation ratios
in the 3D control for LINE_OUT. SS3D provides for a wider soundstage extending beyond the nor-
mal 2-speaker arrangement. Note that the 3D bit in the general purpose register (20h) must be set to
1 to enable SS3D functionality to allow the bits in 22h to take effect.
The three separation ratios are implemented. The separation ratio defines a series of equations that
determine the amount of depth difference (High, Medium, and Low) perceived during two-channel
playback. The ratios provide for options to narrow or widen the soundstage.
IDT™
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HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
V 1.2 1206