The web silence detector previously ran RMS over getByteFrequencyData
bytes (which are already dB-scaled) and re-log'd the result, producing
numbers that didn't line up with real dBFS. Combined with a static
-40 dB threshold that sat right on top of room ambient, silence
detection rarely fired and the user had to click stop manually.
- Rewrite useSilenceDetector to use getFloatTimeDomainData for honest
linear RMS → dBFS.
- Silence threshold is now dynamic: track session peak dBFS and treat
"silent" as 15 dB below peak. Auto-calibrates per mic/room.
- Grace period (1500 ms) at start so the user can begin speaking
before checks arm; static -45 dB fallback until peak clears -25 dB
so dead-silent sessions don't spin forever.
- Silence duration bumped 1500 → 2000 ms for breathing room.
Visual: detached red radial-gradient disc sits behind the mic in a
wrapper; the button no longer scales, so the white mic icon stays
legible on top while the halo grows from 1x to ~2.6x with live
amplitude. Much more obvious "you are live" signal than the prior
subtle box-shadow pulse.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
bvandeusen
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