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Silence-Based EOS triggers end-of-speech after a fixed duration of silence following the last speech activity or transcript. No ML model, no inference overhead. Provider identifier: silence_based_eos

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Source Location

api/assistant-api/internal/end_of_speech/internal/silence_based/
└── silence_based_end_of_speech.go

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How It Works

  1. A single worker goroutine manages a timer
  2. When a final SpeechToTextPacket arrives, text is accumulated and the timer is set to timeout
  3. When a VadSpeechActivityPacket or interim SpeechToTextPacket arrives, the timer resets
  4. When the timer expires, EndOfSpeechPacket fires with the accumulated text
  5. State resets for the next turn
STT final → accumulate text → start timer (1000ms)
VAD activity → reset timer
STT interim → reset timer
...silence...
Timer fires → EndOfSpeechPacket → LLM starts

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Parameters

Option KeyDefaultRangeDescription
microphone.eos.timeout1000 ms500–4000 msSilence duration before triggering end-of-speech
The UI sets a default of 700 ms when switching to this provider. The backend default (when no value is configured) is 1000 ms.

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Setup

No model files or downloads required. Works out of the box with both Docker and source builds. To select this provider, set microphone.eos.provider to silence_based_eos in the assistant’s audio options (or leave it unset — it is the default).