---
title: nativeAudioFormat
framework: speech
role: symbol
role_heading: Instance Property
path: speech/sfspeechaudiobufferrecognitionrequest/nativeaudioformat
---

# nativeAudioFormat

The preferred audio format for optimal speech recognition.

## Declaration

```swift
var nativeAudioFormat: AVAudioFormat { get }
```

## Discussion

Discussion Use the audio format in this property as a hint for optimal recording, but don’t depend on the value remaining unchanged.