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fix(stt): reset VAD when STT sends EOT #5095

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Merged
chenghao-mou merged 3 commits into from
Mar 30, 2026
+12 −0
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fix(stt): reset VAD when STT sends EOT #5095

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b9a2ec0
fix(stt): reset VAD when STT sends EOT
chenghao-mou Mar 12, 2026
d1eafc4
add a warning about user speaking state
chenghao-mou Mar 30, 2026
df587a3
improve comments
chenghao-mou Mar 30, 2026
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12 changes: 12 additions & 0 deletions livekit-agents/livekit/agents/voice/audio_recognition.py
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Original file line number Diff line number Diff line change
Expand Up @@ -483,6 +483,18 @@ async def _on_stt_event(self, ev: stt.SpeechEvent) -> None:
with trace.use_span(self._ensure_user_turn_span()):
self._hooks.on_end_of_speech(None)

# STT EOT changes user state from speaking to listening without updating VAD internal states
# VAD EOS will also skip updating user state from listening (STT enforced) to listening (VAD detected)
# and user state won't be updated until a new VAD SOS is received
# reset VAD so that incorrect end of turn from STT can be corrected by VAD interruption
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@theomonnom theomonnom Mar 30, 2026

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Can you add a comment that it is related to the fact that vad is waiting some amount of "speech" before triggering an event

# if user is still speaking (an immediate VAD SOS will interrupt the agent)
if self._vad:
if self._speaking:
logger.warning(
"stt end of speech received while user is speaking, resetting vad"
)
self.update_vad(self._vad)

self._speaking = False
self._user_turn_committed = True
if not self._vad or self._last_speaking_time is None:
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