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Background Noise Reduction App
Are there any apps out there that can take a live instrument recording and get rid of the background noise? Any help is appreciated. 
Merry Christmas.
Comments
It depends on the relative levels of background noise to desired content, but sometimes a noise gate can help. It will only be able to cut the background noise during gaps though.
Hi Mr Music Maker,
I've worked and played with acoustics for almost all my life so maybe I can help you here.
You didn't specify which type of background noise you have. Noise comes in many flavours, continuous, non-tonal, tonal, intermittent, or any combination of these and many others. The way to reduce these varies according to the type.
In general, clicking noises such as vinyl pops and tonal noise such as feedback are quite easy to eliminate or greatly reduce using notch or 1/3rd octave filters with very little degradation of sound. Most filter apps can assist here.
Continuous, non-tonal noise (think tape noise) is an integral part of the sound wave and impossible to eliminate without seriously degrading the sound quality. Many methods have been used, the Dolby system of the 70s being one of the most successful.
So, if your background noise is bangs or thumps or other such rapid rise, narrow frequency sounds, use a 1/3rd octave filter, if it is tonal use a notch.
Another interesting point about fast rise, ultra short duration noise is that you can delete it completely and leave a complete silence where the noise was. Your brain will fill in the missing sound! This is how check-sum in digital recordings works, if there's an error a silence is inserted - this happens many times in virtually every digital recording and you never hear them.
Hope that helps.
That's really interesting Yan. By background noise, I mean that steady "tshhhhhhh" sound when recording using a microphone. I don't have a properly treated recording room yet. I can remove noise quite easily on the PC, but since my current PC is crap, and the iPad has a better array of music apps, I'd likemy workflow to remain 100% on the iPad.
PaulB, any suggestions on apps that have a gate of some sort? (Definitely not my favorite noise removal method though.)
Where is the mike? At the instrument or at the speaker outlet - what is the instrument?
Some apps that I'm aware of with noise gates are JamUpPro, Ampkit, and Hokusai.
One or two of the DAWs have them.
@funjunkie27, Hokusai looks like the app I'd probably get, but $9.99 USD to unlock the complete package will take some time to save for. Spent most of my holiday money on just about everything else, lol.
@PaulB, which ones? Is there one in Cubasis I'm not aware of?
@Yan, vocals in this case. The mike would be near the mouth. I'm using the iRig mic.
Not an answer to the question as you mentioned your not looking to do this on your pc but incase anyone else might be looking at this thread Audacity is useful for many things including noise removal and free for both mac and pc.
http://audacity.sourceforge.net/
Meteor has one for £1.49, I imagine Auria must have one, Cubasis hasn't, but I did clean up a hissy 25 year old cassette recording quite well using the EQ insert effect.
BM2 has one too.
I've never used a gate for noise removal because I find the end result more irritating than the noise itself. If the signal is suddenly removed because the level falls beneath the threshold, the absence of the noise is very noticeable and makes it more pronounced when it returns. You can hear this clearly in many cheaply remastered analogue CDs.
The other problem is with music that has a wide dynamic range - where do you set your level?
In my reel-to-reel days I found the judicious used of high frequency filters was the best method of removing the worst of the tape hiss. One simple and effective means was a piece of light cardboard placed in front of the tweeter!
Mr Music, You haven't mentioned what you think is the source of the noise?
Hi Paul,
That well-calibrated cassette wow brings memories...
Cleaning noise from cassettes does not normally create problems because the upper frequencies are normally missing anyway. So, even harsh filtering will have minimal negative effect. That's not true for live recordings where the high-end harmonics are crucial to ensure the 'presence'' of the music is not affected.
BTW is that a 70s TV theme, or James Bond theme??? I can't place it.
It's a theme I wrote with old 70's TV adventure serials in mind, with a bit of a nod to Thomas Dolby in there as well. As far as I know, it's original.
@Yan, it's like a background white noise. It's noticeable enough to cause mild irritation.
This video not only shows an example of what I mean by background noise, it also shows the type of noise removal/clean up method I'm looking for.
@PaulB, fantastic piece of music.
That said, I'm not sure purchasing Meteor would be worth that. Bit too much money just for one function. (Not just the 1.49, but also having to pay the original price).
@noisyninja, I usually use Edison in FL Studio to clean up noise when I'm producing on the PC. The idea is to move away from the PC and onto the iPad.
I'm not at all convinced by the demo here. Voice has very limited frequency range - and next to zero high frequency component. Good high and low pass filters could achieve similar results I would imagine. He also is using fan noise -which is very tonal. If the problem is truly white noise with no tones then you can only reduce the noise by filtering which will remove components of your music harmonics.
The one true solution is to trace the source of the interference and eliminate it. Somewhere in your chain there is likely to a substandard or faulty part - it might even be the iPad input.
Any new apps that can help with this issue?
Any new apps that can help with this issue? basically room noise
Denoise does an excellent job with this specific kind of noise. Someone else recommended it a few months ago. It's had regular updates, and that dev's video stabilizer is very good too.
Not sure what you are doing if you have audio interface, wires that may cause, or particular apps or headphones.
OR PLUGGED IN WHILE USING.
So many things.
I find turning down volume of the ipad and finding ways to boost levels per apps is best sssss removal.
AUFX:Push is a well-regarded, standalone compressor/limiter/noise gate for US$5: https://itunes.apple.com/us/app/aufx-push/id958106165?mt=8
Noise gating is different from noise reduction. Gating just silence the parts below a certain threshold: it won’t remove hiss or noise from a performance, so a noise gate has a limited utility. The OP is searching for a noise reduction algorythm like Waves’ X-Noise or Izotope’s RX DeNoiser. I think the only option of the kind in iOS is the Noise Reduction function inside the paid version of Hokusai. I use it extensively and find it as reliable as the said Desktop plug-ins, albeit much less feature packed, and much simpler to use. Cheers!
Since I got rid of all vinyl stuff I didn't buy the Hokusai noise reduction IAP, but suppose it's better than the Fruity example above, which is plain rubbish with all the artifacts it introduces into the main part.
Or the operator had no idea what he was doing...