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# 256-Advances in Speech Recognition

# What's New

# Support for macOS

  • Supports both AppKit and iPad apps
  • 50+ languages supported
  • required privacy approval
  • must have Siri enabled

# On-Device Speech Recognition

  • Speech is private, stays on-device
  • Network connection not required
  • No cellular data consumption
  • iPhone 6s and later; iPad (5th generation) and later; All mac

# Server VS On-Device

Server On-Device
Accuracy Best Good
Limits 1 minute max audio duration; Limited requests per day None
Languages 50+ 10+

# On-Device Languages

# Code

let locale = Locale(identifier: "en-US")
speechRecongnizer = SFSpeechRecognizer(locale: locale)!
// 是否支持 On Device
// supportsOnDeviceRecognition 这个属性有疑问，它竟然是可写的，本身是 false 设为 true 有用吗？(经测试没有，应该要改为只读)
if speechRecognizer.supportsOnDeviceRecognition {
    // 要求识别必须 On Device，不请求网络
	request.requiresOnDeviceRecognition = true
}
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# Speech Recognition Results

  • Speaking rate
  • Average pause duration
  • Voice Analytics features

# Voice Analytics Features (SFVoiceAnalytics)

# Pitch

Measures frequency characteristics of voice

# Voicing

Identifies voiced regions in speech

# Shimmer

Measures variation in amplitude

# Jitter

Measures variation in pitch

# 类结构图

What's New
Support for macOS
On-Device Speech Recognition
Speech Recognition Results
Voice Analytics Features (SFVoiceAnalytics)
类结构图