Yes with a notch filter or with the silence finder.

That's not how db works in audacity. 0db is the max before clipping.

Adjust your input so you're peaking at -1db or below.

If you have too much background noise you need to mitigate that before you hit record. Change locations or put up sound barriers between the mic and source of the noise.

After you do that it's easy to clean up any remaining background noise with the noise cancellation function in the program. Noise gate plugins are also useful.

You can use a noise gate or the envelope tool to silence the track when you aren't speaking but the background noise will still be there otherwise.

The professional thing to do is remove the source of the noise and re-record.

What is the noise? And did you try adjussting the settings on the NR?

Use Krisp. You replace this software mic while using audacity. It works flawlessly. I love it. It uses on device AI to reduce/block background noises like kids crying, fan sound, airport, coffeeshop sounds etc. read the FAQ if you are concerned about data collection. TLDR, they don't collect your voice records, just telemetry on app usage. thats all. https://ref.krisp.ai/u/ua14699990

Be warned that amplifying your actual noise for the noise suppression sample will have an effect on your recording quality. For example, fan hums (if your recording doesnt normally have that) will thin out your voice's lower ranges.

Don't get me wrong, noise suppression is great, but don't exaggerate your noise levels for the sample.

Either buy the studio version or expose your footage differently to compensate for the added noise in post. Those are your best options.

Widely respected anti noise plugin. (Studio is an amazing deal and worth getting) Neat Video

Best way is to Buy studio

You keep asking if you're shooting correctly and yet you say that this problem only occurs when you didn't have enough light . Well that's your answer - stop asking. Shooting in Log generally requires that you overexpose to avoid noise. If you are simply stuck in low light it may help to use a slower shutter speed. You can shoot 24fps at 1/24 sec or 30fps at 1/30 and often get away with little to no motion blur. I do it all the time. Otherwise you have to fix it in Post but that's pretty easy these days with Neat or Studio .

Best and easiest way is to buy studio.

I understand what you’re saying with their noise reducer. I have two options, but unfortunately neither are free:

1. I was able to get the izotope basic package for like $30 on sale and their “noise de-hum” is better than audacity’s noise reduction. You can use it as a plug in on Audacity
2. I just made the jump to Adobe audition and their noise reducer is much much better than Audacity’s.

And as you mentioned, a booth or other set up with also help with reducing the background noise from the recording

Noise reduction can be good, but the first thing you always hear in a recording is the room. Even if you have a great mic and interface, the room is the first thing that anyone will hear. When I've been recording in my PVC and Blanket booth, I've had to make sure that the cats were away, the HVAC was turned off in the house, and the kids were in bed. Also, make sure that the PC fans are not interfering as well.

When I first started, I was using a Yeti (non-blackout) and I was consistently getting coil whine in my recordings. Tried different USB cables and ports, but the Yeti just always produced that noise. The Audacity plugin was able to get rid of the noise generally, but it WOULD affect my voice significantly as well. Getting even an inexpensive XLR microphone and interface should clean up that audio significantly. (Something like a Scarlett Solo and an MXL990).

That being said, as u/FionaAudronVO mentioned, a better plugin might still be worthwhile to see if that helps. Either the Waves or iZotope noise reduction plugins will be better than the standard Audacity stuff. Ultimately, though, no matter how good the software is, the best thing you can do is fix the signal to noise ratio before you do any editing.

If you have too much background noise, you're most likely going to get that robotic effect from any noise reduction program. First of all, make sure the gain on your mic is an appropriate level. There should be a knob for this on the mic. There are plenty of videos and stuff online that explain gain if needed. If possible, have some sort of barrier between your mic and your laptop to reduce the noise from it. In my booth, I keep the laptop under my desk and connected a screen with HDMI, and use a cheap wireless keyboard and mouse so I don't have to bend over every time I want to use it. I imagine you could go without the screen/keyboard/mouse with the right placement. Get a boom arm for your mic and attach it to something that doesn't have anything on it that can emit vibrations (or just make sure your stand isn't on such a surface if the boom arm isn't an option). For example, you don't want your laptop and mic sitting on the same surface, the vibrations will come through, especially on a Yeti. Also just icing on the cake, you could get a shock mount (or make one) to reduce vibration affecting your mic. Make sure you don't have fans or anything that makes emits noise in the room and I would continue using the closet. Throw a thick blanket over your door and any other hard surfaces. If you don't have a crapton of clothes hanging up, start hanging up more or drape blankets or any thick items over the rods to absorb sound. Try to record away from windows or outside walls and do it when there's not a lot of activity in and outside of the house (television on, lawnmowers, trucks driving by, etc.) Finally, you can look at a program called Reaper that is free to try and has a Reafir plugin that you can set up to record the ambient sound in your space and will basically make a threshold for that while recording in real-time.

I set up a booth in my closet. Bought some cheap acoustic foam (spent I think just under $50 for 24 2x12x12 panels) and filled in the rest by cutting up a mattress foam pad. Put a blanket down on the desk surface and let it fall over the desk so I can place my laptop under it. Also put my mic on a boom arm coming from an upper shelf (the arm hangs upside down) so there are no electronics that can transfer vibrations. Good luck to you!

What is your noise floor at? How much noise are you trying to get rid of? I've had good luck with the noise reduction as long as I keep the noise floor under -45db, and making sure to do the noise reduction after I've edited anything I need to, but before doing any amplification, normalization, or compression.

If your noise floor is high, then you're looking at more reducing the noise in your recording, or investing in other software (izotope is a great option).

The solution to getting rid of noise is lowering the gain on the mic, which will make everything sound quieter. To counter this you get right up on the microphone so that it is close to your mouth. This will also add some bass to your voice which you can counter with a high pass filter in audacity.

You are looking for a noise gate and or a denoiser.

Audacity has a noise removal tool and is free.

Dunno how to completely remove it, but I get a big kick out of noise that becomes apparent in my separated stems. In vocal tracks, I can hear rustling noise, false starts, spit sounds and so on. In split instrument tracks, I can hear what sounds like hum, interference, switching noises, razor blade tape edits, keyboard clicks, and more. This provides a slim additional peek into how Udio works.

As a guy who did lot of noise removals (like for thousands of interviews and such), first thing I propose - do not remove it :-) Just test on different people. If they notice it without you telling them and complain - then only proceed with it.

Try Bandlab, there may some tools in there that could help - New Project - Studio (bandlab.com)

Audacity works well for removing background noise, but if you want a simpler process, uniconverter can help clean up your track with its noise reduction feature. It’s great for reducing unwanted sounds, giving you more time to focus on the creative side of your song without worrying about re-recording.

>"... Limiter, noise gate ...".

Can cause buzzing and clicking, but will not cure them. Insufficient high frequencies which adds a lisp: "thrilling" is frilling & some "series" sound like theories. De-esser, (not EQ), to tame sibilance. De-clicker to, (you guessed it), remove clicks.

Worth checking that you're addressing the mic correctly ... https://youtu.be/iyQ4nJgGHZk?&t=20

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Edison has a tool for removing noise