Arma 3: Sound: Processing Types

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Processing Types

Sound Processing Type in Arma 3 audio engine is method of distribution of source wave file channels to output channels.

All sound processing type classes have to be configured within base class CfgSound3DProcessors.

There are 3 different Sound Processing Types in Arma 3:

  • Emitter - spatialized sounds (vehicle engines, animation sounds, weapon shooting without reflections, etc.)
  • Panner - stereo sounds which behaves as "local ambients" in closer distance and clearly spatialized sounds in larger distance (weapon shooting reflections, tree leaves rustling, etc.)
  • Surround Panner - stereo sounds with custom multichannel panner ("directional ambient ssounds")

Emitter

Sound is played from the location of sound source, so this approach should be used for sounds which need to be clearly spatialized.

  • if source wave file is mono, sound is played exactly from the sound source position
  • if source wave file is stereo (2 channels), two virtual speakers (emitters) are created on the horizontal circle with the sound source in the center
  • virtual speakers (emitters) are always facing towards the listeners direction and they remain in the same distance from the listener (and to each other as well), so the positions of virtual speakers keep with player's movement (rotating around a circle)
A3 SoundProcessingType Emitter.jpg
Parameter Unit/values Default Description
type type name "emitter"
innerRange [m] 0
  • below innerRange distance, circle with emitters is static (radius is fixed to the value in radius parameter)
range [m] cfgSoundGlobals
  • above range distance, circle has zero radius (point), both speakers are on the same position
rangeCurve {{d0, v0}, {d1, v1}, ... }

or Class name

linear transition
  • transition curve between setups in innerRange and range distance (100% emitter vs 3D mono sound source)
  • between innerRange and range, circle with emitters changes it is radius from radius to zero using rangeCurve
radius [m] cfgSoundGlobals
  • maximal radius of circle with emitters (reached at innerRange distance and below)
  • consider emitter as a generator of virtual speakers for each recorded channel, so it is settings should correspond with the recording's actual microphone positions/directions
  • if range < innerRange, the range value is set to the innerRange value
  • if you require a static emitter, set the emitter's innerRange to a value greater than SoundShader's range value (emitters range value does not matter in this case)

Panner

Sound panner was designed for stereo wave files to provide smooth transition between ambient (2D) and positional (3D) sound behavior.

  • In closer distances (below innerRange distance) sound behaves as 2D ambient sound, signal is distributed to all channels (left source channel to all left output channels, right source channel to all right output channels, center recieves mono downmix with half amplitude).
  • In larger distances (above range distance) sound behaves as 3D sound, both source channels are mixed to mono and played from sound source position.
  • Between innerRange and range there is an interpolation between two states described above, based on custom transition curve.
A3 SoundProcessingType Panner.jpg
Parameter Unit/values Default Description
type type name "panner"
innerRange [m] 0
  • below innerRange distance source channels are 100% separated and distributed to output channels (left source to left outputs, right source to right outputs)
range [m] -
  • above range distance source channels are downmixed to mono and plays from the location of sound source
rangeCurve {{x0, y0}, {x1, y1}, ... }

or Class name

linear tranisition
  • transition curve between two states described above
  • y value of 1 means behavior present below innerRange distance (ambient sound), value of 0 means 100% positional sound
  • rangeCurve is scaled to range - innerRange (and also it is applied only in the distance between innerRange and range)
  • If listener is below innerRange distance, sound is played as usual stereo sound without any changes with rotation of the listener.
  • If range < innerRange, range value is set to innerRange value.

Surround Panner

Ambient panner was designed to be used with stereo sounds (ambients) to simulate their source location by specifying volume values on predefined directions. Generally, it behaves as a multi-channel panner.

  • Consider predefined directions as virtual speakers: front-right, front-left, rear-right, rear-left
  • For dynamic changes of volume values, use simple expressions with sound controllers
  • Using environment-related sound controllers, virtual speakers behaves as evaluation points.
Parameter Unit/values Default Description
type type name "surround_panner"
radius [m] 7
  • radius of circle, where evaluation of controllers happens (if used within sound defined in EnvSounds)
volumeFrontRight float (0..n) of [dBFS] 1
  • value or expression of front right virtual speaker volume
volumeFrontLeft float (0..n) of [dBFS] 1
  • value or expression of front left virtual speaker volume
volumeRearRight float (0..n) of [dBFS] 1
  • value or expression of rear right virtual speaker volume
volumeRearLeft float (0..n) of [dBFS] 1
  • value or expression of rear left virtual speaker volume
volumeAll float (0..n) of [dBFS] 1
  • optional, overrides other volume parameter values
reference "camera" "camera"
  • "camera" - virtual speakers (evaluation points) position is fixed to camera direction - reference vector is camera direction vector
Currently, only these sound controllers are supported: forest, houses, sea, coast, meadow and only within EnvSounds configuration.