鸿蒙智能语音实战：Speech Kit 打造高精度语音文档系统

在语音转写场景中，我们基于 Speech Kit 实现全链路语音处理，核心实现代码如下：

typescript

// 1. 语音引擎初始化配置

const speechEngine = await speech.createEngine({

  mode: speech.WorkMode.REAL_TIME_TRANSCRIBE,

  params: {

    language: 'zh-CN',

    accent: 'mandarin',

    punctuation: true,

    enableVoiceDetection: true,

    audioFormat: {

      sampleRate: 16000,

      channelCount: 1,

      bitDepth: 16

    },

    vadConfig: {

      startSilence: 500,

      endSilence: 800

    }

  },

  // 硬件加速配置

  hardwareAcceleration: {

    device: speech.Accelerator.NPU,

    enableAEC: true,

    enableNS: true

  }

})

// 2. 实时语音处理流水线

speechEngine.on('result', (text: string) => {

  docEditor.insertText(text)

  const sentences = speechUtils.splitSentences(text)

  sentences.forEach(s => {

    nlpAnalyzer.process(s).then(analysis => {

      ui.updateRealTimeAnalysis(analysis)

    })

  })

}).on('voiceprint', (user: string) => {

  userManager.setCurrentSpeaker(user)

}).on('command', (cmd: string) => {

  commandExecutor.execute(cmd)

})

// 3. 专业领域优化

await speechEngine.loadCustomVocabulary({

  type: 'legal',

  words: [

    '不可抗力', '连带责任', '标的物',

    '要约邀请', '缔约过失'

  ],

  hotWordsWeight: 1.5

})

// 4. 多模态交互控制

const speechControl = new speech.HandsFreeController({

  wakeWord: '小鸿助手',

  commands: [

    { phrase: '保存文档', action: saveDocument },

    { phrase: '添加批注', action: addComment },

    { regex: /跳转到第(\d+)条/, handler: gotoClause }

  ],

  feedback: {

    visual: true,

    auditory: true,

    tactile: true

  }

})

// 5. 离线混合引擎

const hybridEngine = new speech.HybridEngine({

  localModel: {

    path: 'models/local_speech.om',

    features: ['base', 'legal']

  },

  cloudFallback: {

    enable: true,

    auth: await getCloudAuth()

  },

  switchPolicy: {

    networkThreshold: 0.3,

    confidenceThreshold: 0.7

  }

})

//关键技术组件：

//声纹分离：

typescript

speechEngine.enableSpeakerDiarization({

  minSpeakers: 1,

  maxSpeakers: 5,

  identifyKnownUsers: true

})

//智能标点：

typescript

speechEngine.setPunctuationRules({

  strictLegal: true,

  customMarkers: ['§', '¶']

})

//自适应降噪：

typescript

speechEngine.updateNoiseProfile({

  environment: getMeetingRoomNoiseProfile(),

  algorithm: speech.NoiseReduction.DEEP_LEARNING

})

//合规录音存证：

typescript

speechEngine.enableComplianceRecording({

  encryption: 'HW_DRM',

  blockchain: {

    endpoint: getNotarizationService(),

    interval: 60

  }

})

//实时字幕推流：

typescript

const subtitleStream = new speech.SubtitleServer({

  encoding: 'UTF-8',

  maxDelay: 1000,

  protocols: ['WebSocket', 'RTMP']

})

//多语言混输：

typescript

speechEngine.enableCodeSwitchDetection({

  languages: ['zh-CN', 'en-US'],

  switchThreshold: 0.5

})

//优化实践建议：

//硬件资源管理：

typescript

speechEngine.setResourcePolicy({

  cpuCore: 2,

  memoryMB: 512,

  thermalLimit: 70

})

//个性化语音适应：

typescript

speechEngine.adaptToSpeaker({

  voiceSample: getUserVoiceprint(),

  adaptationRate: 0.3

})

典型应用场景：

法律会议实时转录

医嘱语音电子化

多语言采访处理

无障碍语音控制