Spatial Sound for Computer Games and Virtual Reality - Game Sound Technology and Player Interaction: Concepts and Developments - page 305

Table 3. MPEG-4 version 2. Advanced Audio Nodes-PERCEPTUAL NODES

Node Field

PerceptualScene AddChildren

RemoveChildren
BboxCenter
UseAirabs
UseAttenuation
RefDistance
Latereverberance
Heavyness
Liveness
RoomPresence
RunningReverberance
RoomEnvelopment
Presence
Warmth
Brilliance
Fmin
Fmax

PerceptualSound direction

intensity
directivity
omniDirectivity
speedOfSound
distance
location
relParams
directFilter
inputFilter
useAirabs
useAttenuation
spatialize
roomEffect
source

some considerations According to Burgess: “The lack of these [head-

related] cues can make spatial sound difficult to
use. We tend to move our heads to get a better sense
of a sound's direction. This 'closed-loop' cue can
be added to a spatial sound system through the
use of a head-tracking device” (Burgess, 1992).

Head Tracking is an important tool in a dynamic
virtual environment. Apart from the obvious ad-
vantages it brings to the visual presentation it is
also important in the spatial rendering of sound.