Positional channel properties

Understand properties for positional channels in Vivox.

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The audio experience of a user in a positional audio channel is determined by the

Channel3DProperties

component of the

ChannelId

that is passed in to the

IChannelSession

during its construction. The following properties control the 3D experience in the channel. Each of these properties are detailed in the HTML reference for the

Channel3DProperties

class.

```
AudibleDistance
```
- The maximum distance away from a speaker that a listener can hear the speaker and receive their text messages.
- The default value is 2700.
```
ConversationalDistance
```
- Controls the range within which a speaker’s audio remains at its original volume, and beyond which the loudness of the voice chat starts to fade out when heard.
- The default value is 90.
```
AudioFadeModel
```
- Speciﬁes the formula or curve that controls the shape of how the audio fades between the
```
ConversationalDistance
```
  and the
```
AudibleDistance
```
  .
- The default value is
```
EAudioFadeModel::InverseByDistance
```
  .
```
AudioFadeIntensityByDistance
```
- Controls the amplitude of the
```
AudioFadeModel
```
  curve to make the attenuation of the voice chat loudness more or less extreme.
- The default value is 1.0.

The default

Channel3DProperties

values were chosen to provide the most natural sounding, acoustically realistic 3D audio that is suitable for most situations. When using the default properties, any listener within 27 meters (about 88.5 feet) can hear a speaker, and the speaker is heard at full volume by anyone within 0.9 meters (about 3 feet).

注

The default distance values use centimeters because this is the default unit of distance measurement in Unreal, but you can specify these values in any scale.

When customizing distance values, consider the following guidelines:

You can represent the AudibleDistance and ConversationalDistance in any units, but the two units must always match. The values can be different.
注
You must use the same units when reporting your actor’s position by using the Set3DPosition method.
ConversationalDistance is the distance from the listener at which a speaker’s voice is heard at its original volume. This must be an integer in the range 0 <= ConversationalDistance <= AudibleDistance. Consider this to be the expected close-by conversational distance.
The
```
ConversationalDistance
```
sounds the most realistic when it's half the height of a typical speaking entity in your game.
If your players are shorter or taller than typical adult humans, considering adjusting this value to match.
When using the default
```
AudioFadeModel
```
value, if you want voice chat to naturally fade to near zero loudness at the edge of the
```
AudibleDistance
```
so it doesn't sound like it's being abruptly cut off, then set the
```
AudibleDistance
```
to a minimum of:
32 ×
```
ConversationalDistance
```
÷
```
AudioFadeIntensityByDistance
```
.
If you want a lower max
```
AudibleDistance
```
, for example, to limit the range of received texts, then you can increase
```
AudioFadeIntensityByDistance
```
.
Depending on the amount of ambient game noise or music, you might want to further adjust these values to ensure that voice chat is heard only at the distances you want.
When using the
```
ExponentialByDistance
```
```
AudioFadeModel
```
, it's recommended that you keep the
```
ConversationalDistance
```
value at 1 or greater.
When using the
```
ExponentialByDistance
```
```
AudioFadeModel
```
, it's recommended that you adjust the value of the
```
AudioFadeIntensityByDistance
```
property based on the following formula:
```
AudioFadeIntensityByDistance
```
= 3 ÷ (1 + 1.75 × log10(
```
ConversationalDistance
```
))

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