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# AVAudioEnvironmentDistanceAttenuationModel

Types of distance attenuation models.

```
enum AVAudioEnvironmentDistanceAttenuationModel
```

## Overview

Distance attenuation is the natural attenuation of sound when traveling from the source to the listener. The different attenuation models describe the drop-off in gain as the source moves away from the listener.

## Topics

### Attenuation Models

[`AVAudioEnvironmentDistanceAttenuationModel.exponential`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationModel/exponential)

An exponential model that describes the drop-off in gain as the source moves away from the listener.

[`AVAudioEnvironmentDistanceAttenuationModel.inverse`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationModel/inverse)

An inverse model that describes the drop-off in gain as the source moves away from the listener.

[`AVAudioEnvironmentDistanceAttenuationModel.linear`](/documentation/AVFAudio/AVAudioEnvironmentDistanceAttenuationModel/linear)

A linear model that describes the drop-off in gain as the source moves away from the listener.


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