Removing background noise
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This 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.
Removing background noise
How do I remove background noise? I have a recording where music is playing in the background. I want to isolate the people speaking in the recording.
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Gale Andrews
- Quality Assurance
- Posts: 41761
- Joined: Fri Jul 27, 2007 12:02 am
- Operating System: Windows 10
Re: Removing background noise
You don't. That is not noise, like steady hum or hiss which can usually be reduced.
It is part of what you recorded.
Gale
It is part of what you recorded.
Gale
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Re: Removing background noise
I cannot provide a concrete solution. But I know that great progress has been made in the area of speech recognition. This works even with a good portion of background noise, as can be verified with an off-the-shelf Smart-phone. I'm not that much an expert on speech recognition, but AFAIK it is based on detecting formants to a large extend. So, if speech can be extracted successfully from a "noisy" signal, it should also be possible to do it the other way around, i.e. filter out all the rest. You would pretty much zero out those frequencies where you have not detected speech (formants) in the current frame. However I don't know if anybody has actually tried that before...
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Gale Andrews
- Quality Assurance
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- Joined: Fri Jul 27, 2007 12:02 am
- Operating System: Windows 10
Re: Removing background noise
We have a proposal for source separation ( http://wiki.audacityteam.org/wiki/Sourc ... tion_Notes ) that would work on sources identified by audio diff ( http://wiki.audacityteam.org/wiki/Audio_Diff_Notes ).Gunnar wrote:great progress has been made in the area of speech recognition. This works even with a good portion of background noise, as can be verified with an off-the-shelf Smart-phone. I'm not that much an expert on speech recognition, but AFAIK it is based on detecting formants to a large extend. So, if speech can be extracted successfully from a "noisy" signal, it should also be possible to do it the other way around, i.e. filter out all the rest. You would pretty much zero out those frequencies where you have not detected speech (formants) in the current frame. However I don't know if anybody has actually tried that before...
It's some way in the future.
Gale
________________________________________FOR INSTANT HELP: (Click on Link below)
* * * * * Tips * * * * * Tutorials * * * * * Quick Start Guide * * * * * Audacity Manual
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kozikowski
- Forum Staff
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- Joined: Thu Aug 02, 2007 5:57 pm
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Re: Removing background noise
Number four.
The Four Horsemen of Audio Recording (reliable, time-tested ways to kill your show)
-- 1. Echoes and room reverberation (Don't record the show in your mum's kitchen.)
-- 2. Overload and Clipping (Sound that's recorded too loud is permanently trashed.)
-- 3. Compression Damage (Never do production in MP3.)
-- 4. Background Sound (Don't leave the TV on in the next room.)
Koz
The Four Horsemen of Audio Recording (reliable, time-tested ways to kill your show)
-- 1. Echoes and room reverberation (Don't record the show in your mum's kitchen.)
-- 2. Overload and Clipping (Sound that's recorded too loud is permanently trashed.)
-- 3. Compression Damage (Never do production in MP3.)
-- 4. Background Sound (Don't leave the TV on in the next room.)
Koz