---
title: SFVoiceAnalytics
framework: speech
role: symbol
role_heading: Class
path: speech/sfvoiceanalytics
---

# SFVoiceAnalytics

A collection of vocal analysis metrics.

## Declaration

```swift
class SFVoiceAnalytics
```

## Overview

Overview Use an SFAcousticFeature object to access the SFVoiceAnalytics insights. Voice analytics include the following features: Use jitter to measure how pitch varies in audio. Use shimmer to measure how amplitude varies in audio. Use pitch to measure the highness and lowness of the tone. Use voicing to identify voiced regions in speech. These results are part of the SFTranscriptionSegment object and are available when the system sends the isFinal flag.

## Topics

### Analyzing voice

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

### Initializers

- [init(coder:)](speech/sfvoiceanalytics/init(coder:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Voice analytics

- [SFAcousticFeature](speech/sfacousticfeature.md)