Skip to main content

Apple Developer Docs

Fonts Symbols

Speech / SFAcousticFeature

Contents

Declaration
Topics
See Also

SFAcousticFeature

The value of a voice analysis metric.

Declaration

class SFAcousticFeature

Topics

Inspecting a feature

frameDuration
acousticFeatureValuePerFrame

Initializers

init(coder:)

Relationships

Inherits From

NSObject

Conforms To

CVarArg
CustomDebugStringConvertible
CustomStringConvertible
Equatable
Hashable
NSCoding
NSCopying
NSObjectProtocol
NSSecureCoding

See Also

Voice analytics

SFVoiceAnalytics

Open on developer.apple.com

SpeechClass

iOS 13.0+iPadOS 13.0+Mac Catalyst 13.0+macOS 10.15+visionOS 1.0+

Declaration
Topics
See Also

Relationships

Inherits From

NSObject

Conforms To

CVarArg
CustomDebugStringConvertible
CustomStringConvertible
Equatable
Hashable
NSCoding
NSCopying
NSObjectProtocol
NSSecureCoding

Built on 2026-05-07