---
title: pitch
framework: speech
role: symbol
role_heading: Instance Property
path: speech/sfvoiceanalytics/pitch
---

# pitch

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

## Declaration

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

## Discussion

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

## See Also

### Analyzing voice

- [SFAcousticFeature](speech/sfacousticfeature.md)
- [voicing](speech/sfvoiceanalytics/voicing.md)
- [jitter](speech/sfvoiceanalytics/jitter.md)
- [shimmer](speech/sfvoiceanalytics/shimmer.md)