Start by finding out whether the noise is audible under your voice, only between phrases, or both. Reduce the source and improve microphone placement first; use suppression for mild, steady noise under speech, and a gate or expander mainly to lower noise during pauses.
A gate cannot remove a fan or keyboard sound while you are speaking, because it opens to let your voice through. If continuous noise remains during speech, you need to address the room or use suppression and then listen for any damage to the voice.
Find when and where the noise occurs
Listen to the actual microphone input that reaches your broadcast, not only to what you hear in the room. In OBS, check which microphone is selected and watch its meter while you speak, pause, and make the noise you are trying to diagnose. If you use another audio app, confirm whether OBS receives the physical mic or a virtual mic processed by that app.
Make a short recording with three parts: a few seconds of room silence, ordinary speech at your usual distance, and a pause after a sentence. Include a quiet word or sentence ending as well as normal-volume speech. Listen on headphones, since laptop speakers or a phone at low volume can hide hiss, clipping, or abrupt cut-offs.
The timing helps identify the right fix. A constant fan hum under speech is different from a keyboard click between phrases; room echo is different again. A gate can reduce sound when the microphone signal falls below its threshold, but it cannot distinguish a fan from your voice when both are present at once. Suppression may help with mild, continuous background sound; neither setting should be treated as a promise of silence.
Also check whether the noise is really coming through the microphone. A soundtrack in the scene, desktop audio, an alert, or a second microphone can sound like room noise in the finished stream. Mute or solo sources during a local recording to narrow it down before changing filters. If the stream uses a prerecorded loop, the audio-sync troubleshooting guide covers a separate problem: audio that drifts out of alignment rather than noise in the mic.
Reduce the source and adjust mic placement
The simplest filter is often a smaller sound at the microphone. If a desk fan points towards the mic, move the fan or turn it away; if a computer fan is the source, try a different mic position that is farther from the computer without making you speak from across the room. Avoid placing the mic directly beside a keyboard, a hard desk surface that reflects sound, or a speaker playing the stream back into the room.
Keep the microphone close enough that your voice is clear at a comfortable speaking level, and point its active side towards you if it is directional. Do not assume every mic works best when spoken into from the front: check the model’s own guidance. A closer, well-aimed mic can make your voice easier to capture relative to distant room sounds, but it does not make a noisy room disappear. Listen for plosives and breath noise as you adjust distance and angle.
Use a stable stand or position rather than holding a microphone during a long broadcast. Handling noise, cable bumps, and contact with a vibrating desk can enter the recording even when the room itself is quiet. If moving the mic makes the voice too quiet, raise its input level carefully and check that loud syllables do not clip. Avoid compensating for a distant mic by turning up every audio source indiscriminately.
Room changes need not begin with purchases. Try closing a door, switching off a non-essential appliance, or moving away from a reflective corner, then record the same test again. Soft furnishings may change reflections, but they will not necessarily resolve a mechanical hum or a nearby click. Change one thing at a time so you can tell what helped.
For a devotional channel, for example, a ceiling fan may be audible continuously while a bell or keyboard appears only in pauses. Moving the mic closer to the speaker and away from the fan may improve both cases; suppression is a later step for the remaining steady sound. For an unattended channel, remember that the room and mic still matter while the microphone is live. Guidance on running a YouTube radio stream with your computer off addresses the broadcast arrangement, not a substitute for clean source audio.
Try OBS Noise Suppression for continuous noise
OBS Project describes its Noise Suppression filter as useful for mild background or white noise, including fan and environmental noise, and notes that it is generally ineffective when there is a large amount of noise in a loud room. It is available on Windows, macOS, and Linux. That scope matters: a filter is a reasonable trial for a quiet, steady fan, not a fix for a room full of loud competing sound. See the OBS Noise Suppression documentation for current method details.
Add the filter to the microphone source that the stream actually uses, then record a sample with it off and another with it on. OBS documents RNNoise as its higher-quality method, with more CPU use than Speex; Speex has a configurable suppression level. The choice is not a universal ranking for your voice or computer. If you try Speex, make a modest change, listen, and avoid increasing the setting simply because the room still sounds imperfect.
OBS also lists NVIDIA Noise Removal as a method, but it requires the NVIDIA Broadcast SDK redistributable. It is distinct from the optional NVIDIA Broadcast application and is not a feature that every OBS installation has ready to use. Check current OBS documentation and system compatibility before choosing it. Do not stack several suppression effects without testing: overlapping processing can make speech sound less natural while adding little practical benefit.
Listen to speech, not just silence, when judging suppression. A filter can make gaps quieter and still leave a fan audible under words. Strong processing may make consonants dull, add watery or metallic texture, or cause parts of a voice to seem to disappear. If you hear that, reduce the effect or remove it; a slightly audible room is often preferable to hard-to-understand speech.
Use a gate or expander for pauses
A noise gate is designed to reduce background sound while you are not talking. In OBS, its close threshold should sit above the room-noise level and its open threshold slightly below the level of your voice, according to the OBS Noise Gate guide. These are relationships, not fixed settings: your mic gain, voice, and room determine where the thresholds belong.
If the close threshold is too high, quiet words and sentence endings can be cut off. If it is too low, the gate may stay open through the noise you hoped to reduce. Set it while speaking naturally, including soft phrases, and listen through pauses. Pay particular attention to an initial consonant at the start of a line and a quiet final syllable at the end; a meter alone will not tell you whether the words remain intelligible.
An expander can lower sounds that fall below its threshold rather than shutting them off as abruptly. OBS explains that it can reduce lower-level sounds such as fans and keyboard clicks, and cautions that a threshold set too high can cut off speech. A lower ratio gives lighter reduction. The OBS Expander guide explains the controls; treat its example values as starting information from OBS, not as settings that will suit every mic.
Gates and expanders are most useful when noise is noticeable in gaps. Neither can mute a sound that happens at the same time as speech without also affecting some part of the speech signal. If a keyboard clack lands over a spoken word, try changing keyboard placement or technique; if a fan hum sits under every sentence, first reduce it at the source and test suppression. This distinction prevents you from chasing a gate setting that cannot solve the problem you hear.
Consider virtual-microphone processing
Optional tools such as NVIDIA Broadcast or Krisp can process microphone audio before OBS receives it. They are separate applications, not built-in OBS features. For the path to work, OBS must use the relevant virtual microphone as its input; merely installing or enabling an effect in another app does not change the microphone OBS is capturing.
For NVIDIA Broadcast, select your physical microphone inside the app, enable the intended noise-removal effect, then select “Microphone (NVIDIA Broadcast)” as the mic input in OBS. NVIDIA’s Broadcast setup guide recommends recording with background noise and comparing with the effect toggled. Its FAQ states hardware and operating-system requirements, including supported NVIDIA graphics hardware and Windows; those requirements can change, so check the current NVIDIA Broadcast page before relying on it. Room echo removal addresses reverberation, a different issue from continuous fan noise.
Krisp documents a different route: add Krisp Microphone as an OBS Audio Input Capture source and listen to a local recording. Its setup material describes filtered voice reaching the stream, but that is vendor guidance rather than an independent comparative test. Neither app is automatically the right choice for every machine or voice. Follow the selected vendor’s current compatibility and setup instructions.
Use only one noise-removal path at a time while comparing. NVIDIA advises users to disable overlapping noise-removal effects in the app or device when troubleshooting. The same practical caution applies when testing processing chains generally: if Broadcast, an OBS suppressor, and another microphone effect are all active, it is hard to know which one caused a muffled voice or helped with the fan. Select the cleanest input route, then add other effects only when you can explain what each one is doing.
If you are running a loop rather than speaking live, be clear about which audio is being processed. A microphone filter affects microphone input, not necessarily the music or recorded programme track. The article on playing different videos automatically in a 24/7 stream deals with programme scheduling; it does not make background noise in a live mic disappear.
Test speech clarity and artifacts
Compare recordings at the volume you expect to use on air. Make one untreated recording, then one per processing change, keeping your mic position and speaking level as consistent as possible. Include the ordinary noise source if it is safe and practical to do so. Listen first for intelligibility, then for how much noise remains during speech and pauses.
Check normal speech and the less forgiving moments: a soft opening word, a quiet phrase, a breath, a pause, and the end of a sentence. Suppression can distort a voice when pushed strongly, and an expander or gate can clip speech if its threshold is poorly set. If a word loses its beginning or the voice turns watery, undo the last change and compare again rather than adding another filter to compensate.
A short test is useful, but a long channel should be checked under its real conditions too. Room noise can change when an air conditioner starts, a door opens, or someone begins working nearby. Record a representative stretch and listen to it from another device, as a viewer would. Monitor the stream’s actual microphone source after any app or device change, because selecting the wrong input can leave OBS listening to an unprocessed mic or to no mic at all.
If other people help operate the channel, write down the input name and the one or two settings that sounded acceptable. A named setup is easier to restore after a software update or source change than a vague instruction such as “turn noise removal on”. Keep an untreated copy of the test where possible, so you can compare future changes with the same source audio.
Choose the lightest effective processing
Choose a fix based on when the noise is audible, how much of it remains after changing the source, and whether your system and mic path support the tool. The table summarises the intended use, not a controlled quality comparison. Product documentation describes separate workflows and limitations; it does not establish that one method sounds best for every setup.
| Approach | Most useful when | Main trade-off |
|---|---|---|
| Source reduction and mic placement | Noise is close to the mic, or the room is loud | Requires changing the physical setup; does not always remove noise completely |
| OBS Noise Suppression | Mild, steady noise continues under speech | Can affect voice quality when pushed; methods differ in configurability and CPU demand |
| OBS gate | Noise is most distracting between phrases | Can cut off quiet words; does not remove noise beneath open-mic speech |
| OBS expander | You want quieter gaps to fade down less abruptly | Needs a careful threshold; excessive settings can affect speech |
| Virtual-microphone processing | You need a separate app’s microphone processing and its requirements suit your system | Adds an input route to select and verify; avoid overlapping suppression |
A practical order is to remove or move the noise source, position and level the mic, test OBS suppression for mild continuous noise, and then decide whether pauses need a gate or expander. Consider a virtual microphone only if you can route it correctly and a recording shows that it helps your own voice. If suppression leaves words unclear, back off; do not trade intelligibility for an empty-sounding pause.
For a channel that must keep playing while you are away, separate microphone cleanup from keeping the programme on air. A computer running OBS requires its own audio and broadcast checks; an uploaded-file workflow can remove the need to leave your own computer running, but it does not clean a noisy recording after the fact. StreamNeo can take the computer-off broadcast burden out of that workflow when you have a prepared video file, while mic noise still needs to be handled in the recording itself.
Before committing, compare the operating options on the pricing page. When the file and channel are ready, start free — 24-hour trial, no card.
FAQ
Will a noise gate remove a fan while I am speaking?
No. A gate reduces the mic signal when it falls below its threshold, which is why it can help during pauses. While it is open for your voice, a fan underneath that voice remains audible; reduce the fan at its source or test suppression for mild continuous noise.
Should I use OBS suppression and NVIDIA Broadcast together?
Start with one noise-removal method so you can hear what it changes. NVIDIA’s troubleshooting guidance advises disabling overlapping removal effects, and multiple filters can make it difficult to locate the cause of muffled or unnatural speech. Compare recordings before adding another stage.
What should I do if noise suppression makes my voice sound strange?
Lower or remove the effect and record the same phrase again. Check consonants, quiet words, and sentence endings, not only the silence between phrases. If the sound remains unclear, improve placement or reduce the noise source instead of increasing processing.
Does microphone noise processing clean the music in a prerecorded stream?
Usually, a microphone filter acts on the selected microphone input, not the prerecorded programme audio. If noise is already in the video’s soundtrack, clean or replace that source file and test it before broadcasting. Confirm which source OBS or your chosen workflow is processing.