​
🎛️ Advanced Features Overview

Beyond basic voice conversations, our Gemini Live implementation includes enterprise-grade features for production deployments:
  • 🔄 Auto-reconnection with context preservation
  • 🌐 Multi-language detection and localized responses
  • ⚙️ Advanced audio configuration for optimal quality
  • 📊 Production monitoring and error handling
  • 🛡️ Security and rate limiting controls

​
🔄 Auto-Reconnection System

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Intelligent Reconnection

Our implementation includes smart reconnection logic that handles network issues gracefully: 
// Auto-reconnection configuration
const reconnectionConfig = {
  maxReconnectionAttempts: 3,
  reconnectionDelay: {
    base: 1000,          // Start with 1 second
    exponential: true,    // Exponential backoff  
    maxDelay: 5000       // Cap at 5 seconds
  },
  contextPreservation: true,
  apologizeInUserLanguage: true
};

​
Context Preservation

When reconnections occur, the system:
  1. Preserves conversation history - Full context maintained
  2. Detects user language - From previous messages
  3. Sends contextual apology - In the user’s detected language
  4. Continues naturally - Seamless conversation flow

​
Multi-Language Apologies

The system automatically detects user language and apologizes appropriately: 
"Sorry, there was a brief connection issue. I'm back now and ready to continue our conversation!"
Supported Languages: English, Spanish, French, German, Italian, Portuguese, Russian, Japanese, Korean, Chinese, Arabic, Hindi

​
🌐 Language Detection & Localization

​
Automatic Language Detection

The system automatically detects user language from speech patterns: 
// Language detection logic
private detectAndUpdateUserLanguage(text: string): void {
  // Pattern matching for common language markers
  if (/\b(hello|hi|hey|yes|no|the|and|you|me)\b/.test(text.toLowerCase())) {
    this.lastUserLanguage = 'en';
  } else if (/\b(hola|sí|no|el|la|qué|dónde)\b/.test(text.toLowerCase())) {
    this.lastUserLanguage = 'es';  
  }
  // ... additional language patterns
}

​
Localized System Messages

Configure system messages in multiple languages: 
{
  "localizedMessages": {
    "en": {
      "greeting": "Hello! How can I help you today?",
      "toolExecuting": "Let me check that for you...",
      "connectionIssue": "Sorry, I had a brief connection issue. I'm back now!"
    },
    "es": {  
      "greeting": "¡Hola! ¿Cómo puedo ayudarte hoy?",
      "toolExecuting": "Permíteme verificar eso por ti...",
      "connectionIssue": "Disculpa, tuve un problema de conexión breve. ¡Ya estoy de vuelta!"
    }
  }
}

​
⚙️ Advanced Audio Configuration

​
Voice Activity Detection (VAD)

Fine-tune speech detection for optimal performance: 
{
  "realtimeInputConfig": {
    "automaticActivityDetection": {
      "disabled": false,
      "startOfSpeechSensitivity": "START_SENSITIVITY_HIGH",
      "endOfSpeechSensitivity": "END_SENSITIVITY_MEDIUM", 
      "prefixPaddingMs": 20,
      "silenceDurationMs": 100
    }
  }
}
Sensitivity Levels:
  • START_SENSITIVITY_LOW - Less sensitive, fewer false positives
  • START_SENSITIVITY_MEDIUM - Balanced detection (default)
  • START_SENSITIVITY_HIGH - Very sensitive, catches quiet speech

​
Audio Processing Pipeline

Configure advanced audio processing: 
{
  "audioProcessing": {
    "noiseReduction": true,
    "echoCancellation": true,
    "autoGainControl": true,
    "highpassFilter": {
      "enabled": true,
      "cutoffFreq": 80  // Hz
    },
    "normalization": {
      "enabled": true,
      "targetLevel": -23  // dB
    }
  }
}

​
Transcription Settings

Control input/output transcription behavior: 
{
  "inputAudioTranscription": {
    "enabled": true,
    "language": "auto-detect",
    "profanityFilter": false
  },
  "outputAudioTranscription": {
    "enabled": true,
    "includeTimestamps": true,
    "formatForDisplay": true
  }
}

​
🎭 Emotional & Affective Dialog

​
Emotion Recognition

Enable emotional understanding (supported models only): 
{
  "enableAffectiveDialog": true,
  "emotionConfig": {
    "detectEmotions": ["happy", "sad", "frustrated", "excited"],
    "respondToEmotions": true,
    "emotionalMemory": true
  }
}
Model Support: Affective dialog is only supported by gemini-native-audio models. Not available for gemini-2.0-flash-exp.

​
Voice Characteristics

Configure voice personality and characteristics: 
{
  "speechConfig": {
    "voiceConfig": {
      "prebuiltVoiceConfig": {
        "voiceName": "Sage",  // Available: Puck, Sage, Echo, Fenix
        "emotionalRange": "full",
        "speakingRate": 1.0,
        "pitch": 0,
        "volumeGain": 0
      }
    }
  }
}

​
📊 Production Monitoring

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Health Checks

Implement comprehensive health monitoring: 
// Health check endpoints
app.get('/health/gemini-live', async (req, res) => {
  const health = {
    status: 'healthy',
    checks: {
      apiConnection: await testGeminiConnection(),
      audioProcessing: await testAudioPipeline(), 
      reconnectionLogic: await testReconnection(),
      toolCalling: await testTools()
    },
    metrics: {
      activeConnections: getActiveConnectionCount(),
      avgLatency: getAverageLatency(),
      errorRate: getErrorRate()
    }
  };
  
  res.json(health);
});

​
Metrics Collection

Track key performance indicators: 
// Metrics tracking
const metrics = {
  // Connection metrics
  totalConnections: 0,
  activeConnections: 0,
  connectionFailures: 0,
  reconnectionSuccess: 0,
  
  // Performance metrics
  avgLatency: 0,
  p95Latency: 0,
  audioProcessingTime: 0,
  toolExecutionTime: 0,
  
  // Quality metrics  
  conversationQuality: 0,
  userSatisfaction: 0,
  taskCompletionRate: 0
};

​
Error Tracking

Comprehensive error monitoring and alerting: 
// Error categories and handling
const errorTypes = {
  NETWORK_ERROR: 'connection_failed',
  API_ERROR: 'api_rate_limit', 
  AUDIO_ERROR: 'audio_processing_failed',
  TOOL_ERROR: 'tool_execution_failed',
  CONFIGURATION_ERROR: 'invalid_config'
};

function trackError(error: Error, context: any) {
  // Send to monitoring service
  // Trigger alerts for critical errors
  // Log for debugging
}

​
🛡️ Security & Rate Limiting

​
API Key Management

Secure API key handling and rotation: 
// API key management
const apiKeyManager = {
  keys: {
    primary: process.env.GOOGLE_GENAI_API_KEY,
    backup: process.env.GOOGLE_GENAI_BACKUP_KEY,
    rotation: process.env.GOOGLE_GENAI_ROTATION_KEY
  },
  
  getCurrentKey(): string {
    // Implement key rotation logic
    // Handle rate limit errors with backup keys
  },
  
  rotateKeys(): void {
    // Automated key rotation  
  }
};

​
Rate Limiting

Implement intelligent rate limiting: 
// Rate limiting configuration
const rateLimits = {
  perUser: {
    requests: 100,    // per hour
    audioMinutes: 30  // per hour
  },
  perIP: {
    requests: 1000,   // per hour
    concurrent: 5     // simultaneous connections
  },
  global: {
    requests: 10000,  // per hour
    audioMinutes: 500 // per hour
  }
};

​
Input Validation

Sanitize and validate all inputs: 
// Input validation
function validateAudioInput(audioData: Buffer): boolean {
  // Check file size limits
  if (audioData.length > MAX_AUDIO_SIZE) return false;
  
  // Validate audio format
  if (!isValidAudioFormat(audioData)) return false;
  
  // Check for malicious content
  if (containsMaliciousPatterns(audioData)) return false;
  
  return true;
}

​
🎛️ Environment-Specific Configuration

​
Development Settings

{
  "environment": "development",
  "debugging": {
    "verbose": true,
    "logAudioChunks": true,
    "logToolCalls": true,
    "logReconnections": true
  },
  "performance": {
    "ultraFastMode": false,  // Disable for debugging
    "chunkSize": 320,        // Larger chunks for stability
    "enableProfiling": true
  }
}

​
Production Settings

{
  "environment": "production", 
  "debugging": {
    "verbose": false,
    "logLevel": "error",
    "sensitiveDataLogging": false
  },
  "performance": {
    "ultraFastMode": true,   // Maximum performance
    "chunkSize": 160,        // 20ms chunks
    "enableProfiling": false,
    "caching": {
      "enabled": true,
      "ttl": 300
    }
  },
  "reliability": {
    "maxReconnectionAttempts": 3,
    "healthCheckInterval": 30000,
    "gracefulShutdown": true
  }
}

​
🔧 Custom Configuration Examples

​
Customer Service Agent

Optimized for customer support scenarios: 
{
  "systemInstruction": "You are a customer service representative...",
  "speechConfig": {
    "voiceConfig": {
      "prebuiltVoiceConfig": {
        "voiceName": "Sage",
        "emotionalRange": "professional"
      }
    }
  },
  "realtimeInputConfig": {
    "automaticActivityDetection": {
      "endOfSpeechSensitivity": "END_SENSITIVITY_LOW",
      "silenceDurationMs": 200  // Allow longer pauses
    }
  },
  "tools": ["knowledge-search", "customer-lookup", "ticket-creation"]
}

​
Healthcare Assistant

HIPAA-compliant configuration for healthcare: 
{
  "compliance": {
    "hipaaMode": true,
    "encryptionAtRest": true,
    "encryptionInTransit": true,
    "auditLogging": true,
    "dataRetention": "none"  // Don't store conversations
  },
  "speechConfig": {
    "voiceConfig": {
      "prebuiltVoiceConfig": {
        "voiceName": "Echo",
        "speakingRate": 0.9  // Slightly slower for clarity
      }
    }
  },
  "inputAudioTranscription": {
    "profanityFilter": false,  // Preserve medical terminology
    "medicalTerminology": true
  }
}

​
Multilingual Support Agent

Optimized for multiple languages: 
{
  "multiLanguage": {
    "autoDetection": true,
    "supportedLanguages": ["en", "es", "fr", "de", "it"],
    "fallbackLanguage": "en",
    "languageSpecificVoices": {
      "en": "Sage",
      "es": "Echo", 
      "fr": "Fenix"
    }
  },
  "systemInstruction": {
    "multilingual": true,
    "languageAdaptation": true
  }
}

​
🚨 Troubleshooting Advanced Issues

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Reconnection Problems

​
Language Detection Issues

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🎯 Production Deployment Checklist

Use this checklist before deploying to production:Configuration
  • API keys secured and rotated regularly
  • Rate limiting configured appropriately
  • Error handling and monitoring implemented
  • Health checks and alerting set up
Performance
  • Ultra-fast mode enabled
  • Optimal chunk sizes configured (160 bytes)
  • Load testing completed successfully
  • Resource scaling configured
Security
  • Input validation implemented
  • Audit logging enabled (if required)
  • Encryption configured for sensitive data
  • Access controls and authentication in place
Reliability
  • Auto-reconnection logic tested
  • Graceful error handling verified
  • Backup systems and failovers ready
  • Monitoring and alerting operational

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📈 Next Steps

Production Deployment

Deploy your advanced Gemini Live agent to production

Integration Examples

Integrate with phone systems and communication platforms

Monitoring & Analytics

Set up comprehensive monitoring and analytics

Support & Troubleshooting

Get help with advanced configuration issues
Master advanced Gemini Live features for enterprise-grade voice AI! 🚀