If your keyboard clatter, PC fans, or a barking dog leak into every quiet moment of your stream, a noise gate is the tool that cleans it up. It is one of the highest-impact audio filters you can add, and it costs nothing but a few minutes of tuning. Here is how it works and how to set it without cutting off your own words.
How a noise gate works
A noise gate is a volume automation that mutes your microphone when the sound falls below a set level and opens it when you speak. It does not remove noise while you talk; it silences the gaps between sentences where background hum would otherwise be exposed. Think of it as a door that stays shut until your voice is loud enough to push it open.
The four controls that matter
| Control | What it does | Typical range |
|---|---|---|
| Threshold | Level that opens the gate | -45 to -30 dB |
| Attack | How fast it opens | 1–10 ms |
| Hold | Keeps it open between words | 100–300 ms |
| Release | How fast it closes | 100–250 ms |
Tuning it without chopping your voice
Set the threshold just above your background noise level: speak normally and lower the threshold until the gate opens reliably on every word, then nudge it up until the silence between sentences goes quiet. Too high and your soft words get cut; too low and the gate never closes. A hold of around 150–200 ms stops the gate from “chattering” open and shut on natural pauses, and a gentle release avoids an abrupt cutoff at the end of sentences.
Gate versus noise suppression
A gate only helps in silence; it does nothing about fan hiss while you are talking. That is the job of noise suppression (like RNNoise or an AI filter), which reduces steady background noise even during speech. The best chain uses suppression first to tame constant hiss, then a light gate to clean the gaps. On a good dynamic mic in a quiet room, a gate alone is often enough.
When you barely need one
A dynamic microphone placed close to your mouth rejects room noise so well that the gate can sit at a low threshold and rarely engage. A condenser mic in an untreated room picks up everything, so it leans harder on both suppression and gating. If you find yourself setting an aggressive gate, the real fix may be a closer mic or a bit of acoustic treatment.
Building the gate into a full chain
A gate rarely works alone; it is one link in a short chain that together makes speech sound broadcast-clean. The reliable order is noise suppression first to tame constant hiss, then the gate to silence the gaps, then a compressor to even out your level, and finally a limiter as a safety catch. Put in that sequence, each filter handles the mess the previous one leaves behind, and the gate only has to deal with genuine silence rather than fighting steady background noise.
The single biggest thing that lets you run a gentle, forgiving gate is mic technique. A dynamic microphone positioned a fist’s width from your mouth captures your voice loud and the room quiet, so the gap between speech and background is wide and the gate can sit at a low, safe threshold. Back away to arm’s length and that gap collapses, forcing an aggressive gate that clips your soft words. If tuning the gate feels like a constant battle, move closer to the mic before you touch another setting; distance fixes more than any filter can.
FAQ
Why does my voice cut out mid-sentence?
Your threshold is too high or your hold is too short. Lower the threshold until soft words pass, and raise hold to about 200 ms so natural pauses do not slam the gate shut.
Should the gate come before or after other filters?
Put noise suppression before the gate, and compression after. That order cleans steady noise first, then gates the silence, then evens out your levels.
Bottom line
A noise gate mutes the quiet gaps where background sound would otherwise leak, making your stream feel clean and professional. Set the threshold just above your room noise, add a little hold and release, and pair it with suppression for constant hiss. It is free, fast, and one of the biggest easy wins in stream audio.
