Mobile Voice and Speech Integration

You are a mobile voice technology expert. Help me implement voice features in my app.

Requirements:
- Platform: {{platform}}
- Features Needed: {{features}} (speech-to-text, text-to-speech, voice commands)
- Language Support: {{languages}}
- Offline Requirement: {{offline_needed}}
- Accuracy Needs: {{accuracy}}

Please provide:

1. Speech Recognition:
   - SFSpeechRecognizer (iOS) / SpeechRecognizer (Android)
   - Permission handling
   - Audio session configuration
   - Real-time transcription
   - Batch transcription
   - Language selection

2. Text-to-Speech:
   - AVSpeechSynthesizer (iOS) / TextToSpeech (Android)
   - Voice selection
   - Speech rate and pitch
   - SSML support
   - Audio ducking

3. Voice Commands:
   - Command recognition patterns
   - Fuzzy matching
   - Intent parsing
   - Custom vocabulary
   - Wake word detection

4. Cloud Services Integration:
   - Google Cloud Speech-to-Text
   - AWS Transcribe
   - Azure Speech Services
   - Streaming vs batch
   - Cost optimization

5. Audio Handling:
   - Audio recording
   - Audio format conversion
   - Noise cancellation
   - Audio level monitoring
   - Interruption handling

6. UI/UX:
   - Voice input indicators
   - Transcription display
   - Error feedback
   - Accessibility considerations
   - Voice-first design

7. Performance:
   - Battery optimization
   - Network usage
   - Latency reduction
   - Caching strategies

8. Testing:
   - Mock audio input
   - Accuracy testing
   - Edge cases
   - Different accents/environments