To enable noise cancellation in LiveKit agents, follow these steps: Installation First, install the noise cancellation package:

pip install "livekit-plugins-noise-cancellation~=0.2"

Usage in LiveKit Agents Include the filter in

RoomInputOptions

when starting your `AgentSession`:

from livekit.plugins import noise_cancellation

# ...
await session.start(
    # ...,
    room_input_options=room_io.RoomInputOptions(
        noise_cancellation=noise_cancellation.BVC(),
    ),
)
# ...

Available Models There are three noise cancellation models available: • `noise_cancellation.NC()`: Standard enhanced noise cancellation • `noise_cancellation.BVC()`: Background voice cancellation (removes non-primary voices) • `noise_cancellation.BVCTelephony()`: Optimized for telephony applications Recommended Model For most 1:1 voice AI applications, LiveKit recommends using the

BVC

model as it removes extra background speakers in addition to background noise, providing the best experience for voice AI applications. Complete Example Here’s a complete example:

from livekit.plugins import noise_cancellation

await session.start(
    agent=MyAgent(),
    room=ctx.room,
    room_input_options=RoomInputOptions(
        # Enable Krisp BVC noise cancellation
        noise_cancellation=noise_cancellation.BVC(),
    ),
    room_output_options=RoomOutputOptions(transcription_enabled=True),
)

Important Note When using server-side noise or background voice cancellation, client-side noise cancellation should be disabled. Noise cancellation models are trained on raw audio and may produce unexpected results if the input has already been processed on the client. Compatibility For LiveKit Agents v0.12, pass the

noise_cancellation

parameter to the

VoicePipelineAgent

or

MultimodalAgent

constructor instead. Sources: AI noise cancellation | LiveKit Docs | examples/voice_agents/restaurant_agent.py | Audio and video | LiveKit Docs | Enhanced noise cancellation | LiveKit Docs