<!--
{
  "availability" : [
    "iOS: 17.0.0 -",
    "iPadOS: 17.0.0 -",
    "macCatalyst: 17.0.0 -",
    "macOS: 14.0.0 -",
    "visionOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "Speech",
  "identifier" : "/documentation/Speech/SFAcousticFeature/acousticFeatureValuePerFrame-5krkk",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Speech"
    ],
    "preciseIdentifier" : "s:So17SFAcousticFeatureC6SpeechE08acousticB13ValuePerFrameSaySdGvp"
  },
  "title" : "acousticFeatureValuePerFrame"
}
-->

# acousticFeatureValuePerFrame

An array of feature values, one value per audio frame, corresponding to a transcript segment of recorded audio.

```
var acousticFeatureValuePerFrame: [Double] { get }
```

---

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)