Mic Lab

Record yourself, then hear the difference the cleaning makes. Nothing here touches the live system.

1 · Record

Tap Record, allow the microphone, and talk like a caller from where you normally are: a sentence about your order, then your phone number. 10 to 20 seconds is enough. Then tap Stop.

The microphone is off until you tap Record.

Advanced

Microphone echo cancellation browser noise suppression auto gain the browser's own processing; applies to the next recording

load a recording instead of the mic hear the cleaned sound live while recording (headphones)

high-pass filter cut below removes rumble, hum and handling noise

Denoiser: none RNNoise Speex GTCRN RNNoise: the classic neural denoiser. Speex: light, old-school. GTCRN: a newer small neural model.

level gate opens above closes below hold a plain loudness gate; mutes anything quieter than the threshold

speech gate (Silero VAD) mute non-speech cut non-speech out starts at ends below pre-roll hangover min speech the same kind of gate the agent uses: only stretches with speech reach the transcriber

normalize level speech to brings a far or quiet voice up to a steady level, never clipping

measure	before	after	what it means

How this maps to the live system. The capture flags are what the browser does before audio leaves the caller's device; the call page already turns them on. High-pass, denoiser and level gate can run in the caller's browser or on the server before the transcriber; phone calls only get the server version. The speech gate mirrors the agent's own gate, with the agent's current values as defaults. Normalize is a server-side candidate. The downloads are exactly what the transcriber would receive.

Mic Lab

1 · Record

2 · Listen