Technical data

ASTi ACE Studio Components Reference Guide Rev. M DOC-01-TELAS-CRG-4
Copyright © 2014 Advanced Simulation Technology inc. 137
10.0. HRTF Service
Description: The HRTF service provides 3D capability for headphone audio. Both
environmental and communications audio can be mixed in 3D. Head-related-
transfer functions (HRTFs) position audio streams at specified 3D (azimuth and
elevation) positions.
The following example depicts a 3D communications configuration for a single
operator. The operator has two CommPanels, one for radios and the other for
intercoms. Since both CommPanels have the same HRTF bus selected (Op1), they
will contribute audio to the same four audio positions. Behind the scenes, the HRTF
service mixes audio from CommPanels with the same HRTF bus. Then the
HRTFOut4 component applies 3D filters according to the specified azimuth and
elevation positions. The HRTFOut4’s left and right audio outputs connect to an
ACENet channel to go to the operator’s stereo headset.
Each additional 3D operator may have a nearly identical configuration, but must
use a unique HRTF bus for independent audio and 3D positioning.
Op1 Radio
CommPanel8HRTF4
HRTF Bus = Op1
Signal 1 = Radio 1
Signal 2 = Radio 2
Signal 3 = Radio 3
Signal 4 = Radio 4
Pos1 Out Control = 1
Pos2 Out Control = 0
Pos3 Out Control = 8
Pos4 Out Control = 0
Op1 Intercom
CommPanel8HRTF4
HRTF Bus = Op1
Signal 1 = Net IC 1
Signal 2 = Net IC 2
Signal 3 = Net IC 3
Signal 4 = Net IC 4
Pos1 Out Control = 0
Pos2 Out Control = 4
Pos3 Out Control = 8
Pos4 Out Control = 2
Op1_Position1 Audio = Radio1
Op1_Position2 Audio = NetIC3
Op1_Position3 Audio = Radio4 + NetIC4
Op1_Position4 Audio = NetIC2
Op1 3D
HRTFOut4
HRTF Bus = Op1
Pos1 Azim
Pos2 Azim
Pos3 Azim
Pos4 Azim
Pos1 Elev
Pos2 Elev
Pos3 Elev
Pos4 Elev
Left
Right
ACENet Device
i.e. ACU2, ACE-RIU
Pos 1
Radio1
Pos 2
NetIC3
Pos 3
Radio4 + NetIC4
Pos 4
NetIC2
HRTF Service