Voice Activity Detection (VAD)

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What is VAD?

• START_OF_SPEECH - User has started speaking
• END_OF_SPEECH - User has stopped speaking
• CONTINUING - Speech is ongoing

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How VAD Works

Audio Frame
    ↓
VAD Plugin
    ↓
Speech Detection
    ↓
Event: START_OF_SPEECH / END_OF_SPEECH / CONTINUING
    ↓
Audio Recognition Handler

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Configuration

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Basic Configuration

from kuralit.server.agent_session import AgentSession

# Using Silero VAD
agent = AgentSession(
    vad="silero/v3",  # Silero VAD v3
    # ...
)

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Sample Rates

• 8000 Hz - Telephone quality
• 16000 Hz - Standard quality (recommended)

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Activation Threshold

• Lower (0.3-0.4) - More sensitive, detects quieter speech
• Default (0.5) - Balanced
• Higher (0.6-0.7) - Less sensitive, reduces false positives

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Available Providers

• Silero - On-device, no API keys needed, works offline

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Next Steps

• VAD Providers → - Choose and configure VAD
• STT → - Speech-to-Text
• Turn Detection → - Turn detection