feat(assemblyai): add vad_threshold parameter for U3 Pro#3927
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markbackman merged 2 commits intopipecat-ai:mainfrom Mar 5, 2026
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feat(assemblyai): add vad_threshold parameter for U3 Pro#3927markbackman merged 2 commits intopipecat-ai:mainfrom
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Add documentation for the vad_threshold parameter in AssemblyAI U3 Pro: - Add vad_threshold to AssemblyAIConnectionParams table - Add usage example showing VAD threshold alignment with Silero VAD - Add note about VAD threshold alignment to avoid "dead zone" - Explain the misalignment issue between AssemblyAI (default 0.3) and Pipecat's Silero VAD (default 0.7) This corresponds to the vad_threshold parameter added in pipecat-ai/pipecat#3927
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LGTM!
Please add a changelog entry too:
https://github.com/pipecat-ai/pipecat/blob/main/CONTRIBUTING.md#changelog-entries
Add vad_threshold parameter to AssemblyAIConnectionParams to support voice activity detection threshold configuration for the u3-rt-pro model. This parameter allows users to align AssemblyAI's VAD threshold with their external VAD systems (e.g., Silero VAD) to avoid the "dead zone" where AssemblyAI transcribes speech that the external VAD hasn't detected yet, which can delay interruption handling. - Range: 0.0 to 1.0 (lower = more sensitive) - Default: 0.3 (API default when not sent) - Only applicable to u3-rt-pro model - Automatically included in WebSocket query parameters Recommended usage: Set vad_threshold to match your VAD's activation threshold (e.g., both at 0.3) for optimal performance.
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- Add vad_threshold parameter documentation for U3 Pro - Remove formatted_finals (v2 API legacy parameter) - Remove word_finalization_max_wait_time (v2 API legacy parameter) - Clarify format_turns only applies to Universal-Streaming models - Add VAD threshold alignment usage example and notes This corresponds to the code changes in pipecat-ai/pipecat#3927
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- Add vad_threshold parameter documentation for U3 Pro - Remove formatted_finals (v2 API legacy parameter) - Remove word_finalization_max_wait_time (v2 API legacy parameter) - Clarify format_turns only applies to Universal-Streaming models - Add VAD threshold alignment usage example and notes This corresponds to the code changes in pipecat-ai/pipecat#3927
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- Add vad_threshold parameter documentation for U3 Pro - Remove formatted_finals (v2 API legacy parameter) - Remove word_finalization_max_wait_time (v2 API legacy parameter) - Clarify format_turns only applies to Universal-Streaming models - Add VAD threshold alignment usage example and notes This corresponds to the code changes in pipecat-ai/pipecat#3927
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- Add vad_threshold parameter documentation for U3 Pro - Remove formatted_finals (v2 API legacy parameter) - Remove word_finalization_max_wait_time (v2 API legacy parameter) - Clarify format_turns only applies to Universal-Streaming models - Add VAD threshold alignment usage example and notes This corresponds to the code changes in pipecat-ai/pipecat#3927
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Add vad_threshold parameter to AssemblyAIConnectionParams to support voice activity detection threshold configuration for the u3-rt-pro model.
This parameter allows users to align AssemblyAI's VAD threshold with their external VAD systems (e.g., Silero VAD) to avoid the "dead zone" where AssemblyAI transcribes speech that the external VAD hasn't detected yet, which can delay interruption handling.
Recommended usage: Set vad_threshold to match your VAD's activation threshold (e.g., both at 0.3) for optimal performance.
Please describe the changes in your PR. If it is addressing an issue, please reference that as well.