---
title: AUVoiceIOMutedSpeechActivityEventListener
framework: audiotoolbox
role: symbol
role_heading: Type Alias
path: audiotoolbox/auvoiceiomutedspeechactivityeventlistener
---

# AUVoiceIOMutedSpeechActivityEventListener

A block that the system calls to indicate speech activity while the user has the microphone muted.

## Declaration

```swift
typealias AUVoiceIOMutedSpeechActivityEventListener = (AUVoiceIOSpeechActivityEvent) -> Void
```

## Parameters

- `event`: An event that indicates whether muted speech started or ended.

## See Also

### Observing muted speech

- [kAUVoiceIOProperty_MutedSpeechActivityEventListener](audiotoolbox/kauvoiceioproperty_mutedspeechactivityeventlistener.md)
- [AUVoiceIOSpeechActivityEvent](audiotoolbox/auvoiceiospeechactivityevent.md)