How to reduce background noise when recording video
Hear the problem, change one thing, and test again. Get a clear spoken recording without turning your room into a studio.
Your explanation sounds fine while you're saying it. Play the video back, though, and a fan competes with every sentence. Recording the whole answer again without changing the setup will probably give you the same problem.
To reduce background noise when recording video, first record a short sample in your actual filming position. Listen for the sound that's interfering, quiet the source or change your location, and bring the microphone closer to your voice where practical. Repeat the sample before recording the full answer. A useful target is speech you can follow comfortably at a normal listening volume.
For a short video of yourself speaking, start with the phone and room you already have. Here's a way to choose the next adjustment by what you hear.
Record a sound check that includes your real movements
Use the camera app, microphone, framing, and speaking position you intend to use for the video. A voice memo held near your mouth won't tell you what a phone across the room will capture.
Record a few quiet seconds, say part of your answer at your normal speaking volume, then make any movement the video requires. Stop and listen through headphones. UC ANR's recording guidance recommends a short test, headphone playback, and another test after adjusting microphone position. It also suggests recording the background alone to help diagnose unusual sounds.
Here's an original sound-check script you can adapt:
[Stay still without speaking.]
This is where I'll stand for the video. Before choosing your paper, compare the two samples beside each other.
[Lift the samples and turn them as you will in the demonstration.]
I'll keep them here while I explain the difference.
[Stay still again, then stop recording.]
Replace the paper example with your actual subject. The quiet sections reveal the background; the movement tests a part of filming that “testing, one, two” misses. Listen for a necklace brushing a lapel mic, paper crackling beside it, or a bump when you touch the phone's support.
Match the sound to one change
These are starting points for diagnosis, not certain explanations of every noise. Compare another recording after each change.
| What you hear | First change to try | What to listen for afterward |
|---|---|---|
| A continuous fan or appliance sound | Pause a nonessential source you control, or move farther from it | Whether that particular sound drops during speech as well as between sentences |
| Traffic, conversation, or occasional loud interruptions | Close the window or door; try another location or a quieter time | Whether interruptions still obscure words |
| A roomy tail after your words | Try a spot with more soft furnishings and less exposed hard surface | Whether sentence endings sound less washed out |
| Low buffeting when a breeze reaches the mic | Move to shelter; use suitable wind protection for an external mic | Whether gusts still overwhelm the voice |
| Scratches or thumps when you move | Keep fabric and jewelry clear of the mic; avoid touching its cable or support | Whether the same movement is now quiet enough |
Shure's home-recording guide covers background sources, room reflections, and sample recordings in different positions. Use your playback to choose the location rather than assuming the room that looks best will sound best.
Soft furnishings can help with reflected sound inside a room. They aren't a promise that traffic outside will disappear. If passing vehicles cover your words, changing the time or location may be the useful adjustment.
Outdoors, use the wind protection intended for your microphone and conditions. RØDE's windshield guidance distinguishes light-wind use of its supplied foam from stronger-wind protection. A cover doesn't make every outdoor position workable; listen to another sample in shelter before committing to the take.
Bring the microphone closer while keeping the shot useful
A wide shot can put a phone's built-in microphone farther from your voice than you expect. Try a closer framing and repeat the same lines at the same speaking volume. Digital zoom changes the picture framing; it doesn't physically move the microphone toward you.
Shure's microphone techniques guide explains that reducing the voice-to-microphone distance increases direct voice relative to room ambience. This helps explain why moving closer can be useful even when you haven't made the room silent.
Check the picture too. If the closer position cuts off the hands or sample your explanation needs, it doesn't solve the whole recording problem. An external microphone, if you already have a compatible one, lets you try a position closer to your voice while leaving the camera farther away. Follow its placement guidance and test the actual recording app with it connected.
There's no single distance that suits every phone, microphone, room, and demonstration. Keep the position where your words are clear, your voice sounds comfortable, and the useful action remains visible.
Work through a setup before recording the full answer
Imagine you're filming a comparison of two paper finishes at a workshop table. The situation and decisions below are fictional teaching examples, not results from a recording test.
Your first sample contains a desk fan throughout, a distant voice, and a scrape when you lift the paper. Instead of changing everything together, plan these checks:
| Sample | Change from the previous setup | Decision to make from playback |
|---|---|---|
| A | Original position and normal demonstration | Identify when each interfering sound occurs |
| B | Pause the desk fan for the short test, if practical | Is the continuous sound reduced, or is another source still audible? |
| C | Bring the phone closer, keeping both samples visible | Is speech easier to follow without losing the comparison? |
| D | Keep the paper away from the microphone as you lift it | Does the scrape disappear while the sample stays in view? |
These are questions to answer from your own files. If sample B makes no useful difference, check another source. If C loses the demonstration, restore the framing and try another microphone position or location.
Keep a simple note with the setup you choose:
Video and room:
Camera app and microphone used:
Sound that interfered:
One change tried:
Sample filename:
Speech clear? Required movement visible?
Keep this setup / try next change:
Once a sample works, record the complete explanation in that setup. If a sudden noise covers a sentence, wait for it to pass and repeat the whole thought. That gives you a complete replacement to choose later.
Decide whether an existing noisy take is worth keeping
If you've already recorded, preserve the original and try any cleanup on a copy. Test a passage containing both speech and background sound before processing everything.
For example, Audacity's Noise Reduction documentation describes an effect for steady sounds such as hum and hiss, with limits for irregular noise. It warns that excessive reduction can damage the audio you want to keep. Those limits describe that effect, rather than every audio tool.
Listen for lost syllables or an unnatural voice in the processed version. If the words still require guessing, a fresh take in a better setup may be the more useful choice. Turning the whole clip down also turns down your voice. Cutting silent gaps won't remove noise underneath spoken words; the silence-removal guide covers that separate editing task.
Finish the clear take
Once you can follow the recording comfortably, move on to the edit. The talking-head video guide covers the wider filming-to-finished-video process.
For a portrait take in your iPhone camera roll, Remixie can add captions and a chosen style, with preview and export. Listen to the finished result and check the captions against your actual words before sharing it.
Start with one short sound check today. Find the sound that interferes most, change one thing, and repeat the same lines. Choose the setup by the recording you hear, then film the answer you came to share.