Hard to remove electrical noise from guitar audio

Help for Audacity on Windows.
Forum rules
ImageThis forum is for Audacity on Windows.
Please state which version of Windows you are using,
and the exact three-section version number of Audacity from "Help menu > About Audacity".


Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
Post Reply
joshendy
Posts: 3
Joined: Wed Apr 14, 2021 5:45 am
Operating System: Windows 10

Hard to remove electrical noise from guitar audio

Post by joshendy » Wed Apr 14, 2021 5:55 am

Hi there, I'm using Audacity 3.0.0 on Windows 10.

I've got an electric guitar with some experimental electronics installed which are in-circuit with the guitar's pickup. Electrical noise is being transferred from a switching regulator to the audio signal. The switching occurs between 600-1000 kHz. With my limited knowledge I'm struggling to figure out how to remove this noise in Audacity. I've tried noise reduction, notch filter etc. I will fix this properly electrically but in the meantime I was hoping I could clean up the audio.

I've attached a short sample WAV of the guitar's output and it's quite obvious to hear the horrible electrical noise. I was hoping someone might be able to take a look and see if they can spot the issue and perhaps what might work to remove it (if possible).

Thanks,
Joshua
Attachments
test.wav
(1.18 MiB) Downloaded 11 times

kozikowski
Forum Staff
Posts: 68881
Joined: Thu Aug 02, 2007 5:57 pm
Operating System: macOS 10.13 High Sierra

Re: Hard to remove electrical noise from guitar audio

Post by kozikowski » Wed Apr 14, 2021 8:30 am

Now post a sound test with some silence in it. We can't do anything with a fuzz guitar performance.

Koz

joshendy
Posts: 3
Joined: Wed Apr 14, 2021 5:45 am
Operating System: Windows 10

Re: Hard to remove electrical noise from guitar audio

Post by joshendy » Sun Apr 18, 2021 7:32 am

The problem is there is no fuzz in the silence, the regulator powers LED lights that react to the guitar so they're off when the guitar isn't playing. The only time the noise occurs is when the LED's are on which is while the guitar is being played.

kozikowski
Forum Staff
Posts: 68881
Joined: Thu Aug 02, 2007 5:57 pm
Operating System: macOS 10.13 High Sierra

Re: Hard to remove electrical noise from guitar audio

Post by kozikowski » Sun Apr 18, 2021 9:45 am

It still sound just like a normal fuzz guitar performance to me. I don't hear anything I would call electrical interference. Any way to post a sound test without the extra electronics so we know what "normal" is.

I don't think there's any way to fix that into a normal-sounding guitar. Once you distort the sound enough, you're recording the distortion, not the performance. There's no guitar in there to "clean up."

Koz

joshendy
Posts: 3
Joined: Wed Apr 14, 2021 5:45 am
Operating System: Windows 10

Re: Hard to remove electrical noise from guitar audio

Post by joshendy » Mon Apr 19, 2021 7:21 am

I've attached a audio clip of the guitar (not being played) with just the LEDs going on and off so you can hear the electrical noise that's being introduced by the electrical regulator. That same screech in this clip is present in the previous.
Attachments
guiitar_led_noise.wav
(861.18 KiB) Downloaded 4 times

steve
Site Admin
Posts: 80659
Joined: Sat Dec 01, 2007 11:43 am
Operating System: Linux *buntu

Re: Hard to remove electrical noise from guitar audio

Post by steve » Mon Apr 19, 2021 11:35 am

"Noise Reduction" is your best tool, but you will only be able to reduce the noise and not remove it entirely.
https://manual.audacityteam.org/man/noi ... ction.html

This has had noise reduction applied. It's a matter of opinion whether this sounds any better:
guiitar-nr.wav
(1.18 MiB) Downloaded 3 times
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)

Post Reply