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Fix missed quiet "yes" after phone confirmation: more sensitive VAD

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After the phone confirmation a caller's "yes" wasn't picked up (silence) until
they repeated it louder. Logs: line was live and the half-duplex gate had
reopened, but VAD never fired for ~14s — the quick/quiet "yes" was below
threshold (min_volume 0.3, start_secs 0.2).

Now that HalfDuplexGate gates out the agent's echo while it speaks, VAD can be
sensitive without echo false-triggers (it only listens hard on the caller's
turn). Lowered min_volume 0.3->0.15, start_secs 0.2->0.1, and trimmed the echo
tail 0.5->0.25 so an answer right after the agent stops isn't dropped.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
tocmo0nlord
2026-06-27 17:36:20 +00:00
parent 32a3bb7136
commit b0df7fd5b0
3 changed files with 17 additions and 7 deletions
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9
bot.py
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@@ -98,15 +98,18 @@ PIPELINE_SAMPLE_RATE = 16000 # internal rate Whisper/VAD actually need
# VAD tuning. Defaults (confidence 0.7 / min_volume 0.6) are desktop-mic values that can
# miss short/quiet 8 kHz telephony utterances like "yes" — loosen them for the phone.
# VAD is kept sensitive so a quick/quiet "yes" isn't missed (a caller had to repeat it). This
# is safe because HalfDuplexGate gates out the agent's echo while it speaks, so sensitive VAD
# doesn't cause echo false-triggers — it only listens hard during the caller's own turn.
VAD_CONFIDENCE = float(os.environ.get("VAD_CONFIDENCE", "0.5"))
VAD_MIN_VOLUME = float(os.environ.get("VAD_MIN_VOLUME", "0.3"))
VAD_START_SECS = float(os.environ.get("VAD_START_SECS", "0.2"))
VAD_MIN_VOLUME = float(os.environ.get("VAD_MIN_VOLUME", "0.15"))
VAD_START_SECS = float(os.environ.get("VAD_START_SECS", "0.1"))
VAD_STOP_SECS = float(os.environ.get("VAD_STOP_SECS", "0.5"))
# Half-duplex: ignore inbound audio while the agent is speaking (+ this tail in seconds)
# so the agent's own voice echoing back the phone line can't trigger a false barge-in that
# cancels its reply (= caller hears silence). Set HALF_DUPLEX=false to allow barge-in.
HALF_DUPLEX = os.environ.get("HALF_DUPLEX", "true").lower() not in ("false", "0", "no")
ECHO_TAIL_SECS = float(os.environ.get("ECHO_TAIL_SECS", "0.5"))
ECHO_TAIL_SECS = float(os.environ.get("ECHO_TAIL_SECS", "0.25"))
# Agent persona name — purely for warmth; change/remove freely.
AGENT_NAME = os.environ.get("AGENT_NAME", "Sofia")