<!--
{
  "availability" : [
    "iOS: 10.0.0 -",
    "iPadOS: 10.0.0 -",
    "macCatalyst: 10.0.0 -",
    "macOS: 10.15.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Speech",
  "identifier" : "/documentation/Speech/SFSpeechAudioBufferRecognitionRequest/append(_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Speech"
    ],
    "preciseIdentifier" : "c:objc(cs)SFSpeechAudioBufferRecognitionRequest(im)appendAudioPCMBuffer:"
  },
  "title" : "append(_:)"
}
-->

# append(_:)

Appends audio in the PCM format to the end of the recognition request.

```
func append(_ audioPCMBuffer: AVAudioPCMBuffer)
```

## Parameters

`audioPCMBuffer`

An audio buffer that contains audio in the PCM format.

## Discussion

The audio must be in a native format and uncompressed.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)