<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.0.0 -",
    "macOS: 10.15.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Speech",
  "identifier" : "/documentation/Speech/SFVoiceAnalytics/pitch",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Speech"
    ],
    "preciseIdentifier" : "c:objc(cs)SFVoiceAnalytics(py)pitch"
  },
  "title" : "pitch"
}
-->

# pitch

The highness or lowness of the tone (fundamental frequency) in each frame of a transcription segment, expressed as a logarithm.

```
@NSCopying var pitch: SFAcousticFeature { get }
```

## Discussion

The value is a logarithm (base `e`) of the normalized pitch estimate for each frame.

---

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)