---
title: AVAudioEnvironmentDistanceAttenuationModel.inverse
framework: avfaudio
role: symbol
role_heading: Case
path: avfaudio/avaudioenvironmentdistanceattenuationmodel/inverse
---

# AVAudioEnvironmentDistanceAttenuationModel.inverse

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

## Declaration

```swift
case inverse
```

## Discussion

Discussion The framework calculates this value as distanceGain = referenceDistance / (referenceDistance + rolloffFactor * (distance – referenceDistance)).

## See Also

### Attenuation Models

- [AVAudioEnvironmentDistanceAttenuationModel.exponential](avfaudio/avaudioenvironmentdistanceattenuationmodel/exponential.md)
- [AVAudioEnvironmentDistanceAttenuationModel.linear](avfaudio/avaudioenvironmentdistanceattenuationmodel/linear.md)