How to clean up audio files (i.e. remove background noise)

Started by joeblow, April 20, 2009, 12:39:57 PM

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joeblow

April 20, 2009, 12:39:57 PM
How to clean up audio files (i.e. remove background noise)

1. Download WavePad.
2. High Pass Filter -> 200.
3. Noise Reduction -> Auto Spectral Subtraction -> 30%.
4. Automatic Gain Control.
5. Noise Reduction -> Auto Spectral Subtraction -> 30%.
6. Amplify 200%.
7. Save as Stero 128 kps 44.1 khz MP3.

sullivan

#1
April 20, 2009, 03:14:26 PM
Quote from: "joeblowman"1. Download WavePad.
Or Audacity (audacity.sourceforge.net) with lame encoder (http://lame.buanzo.com.ar/).  No nags to buy, no disabled options.
"The real menace of our Republic is the invisible government which like a giant octopus sprawls its slimy legs over our cities, states and nation. At the head is a small group of banking houses generally referred to as \'international bankers.\' This little coterie... run our government for their own selfish ends. It operates under cover of a self-created screen, seizes our executive officers, legislative bodies, schools, courts, newspapers and every agency created for the public protection."
John F. Hylan (1868-1936) - Former Mayor of New York City

joeblow

#2
April 20, 2009, 03:50:53 PM
Quote from: "sullivan"
Quote from: "joeblowman"1. Download WavePad.
Or Audacity (audacity.sourceforge.net) with lame encoder (http://lame.buanzo.com.ar/).  No nags to buy, no disabled options.

But Senor, the problem is that it doesn't have those features above^

sullivan

#4
April 20, 2009, 04:17:15 PM
Quote from: "joeblowman"I examined the Audacity Wiki and doing the same thing is extremely confusing:

http://audacityteam.org/wiki/index.php? ... -recorders

http://audacityteam.org/wiki/index.php? ... se_Removal
It isn't that confusing. High pass filtering just has more parameters, but you can stick with the defaults for everything but the cutoff frequency.
For noise removal, you select a portion of the file that has just noise, and build a 'noise profile'. You then use that noise profile to run noise reduction on the whole file. This method may be more convoluted, but gives more accurate results.
"The real menace of our Republic is the invisible government which like a giant octopus sprawls its slimy legs over our cities, states and nation. At the head is a small group of banking houses generally referred to as \'international bankers.\' This little coterie... run our government for their own selfish ends. It operates under cover of a self-created screen, seizes our executive officers, legislative bodies, schools, courts, newspapers and every agency created for the public protection."
John F. Hylan (1868-1936) - Former Mayor of New York City

joeblow

#5
April 20, 2009, 04:22:16 PM
Quote from: "sullivan"
Quote from: "joeblowman"I examined the Audacity Wiki and doing the same thing is extremely confusing:

http://audacityteam.org/wiki/index.php? ... -recorders

http://audacityteam.org/wiki/index.php? ... se_Removal
It isn't that confusing. High pass filtering just has more parameters, but you can stick with the defaults for everything but the cutoff frequency.
For noise removal, you select a portion of the file that has just noise, and build a 'noise profile'. You then use that noise profile to run noise reduction on the whole file. This method may be more convoluted, but gives more accurate results.

Would you be kind enough to edit Ognir's latest audio, then we can compare the results with what I did?

sullivan

#6
April 20, 2009, 09:37:41 PM
Quote from: "joeblowman"Would you be kind enough to edit Ognir's latest audio, then we can compare the results with what I did?
This isn't a competition! I just recommend Audacity, which I use regularly even though I have Ableton and Cakewalk Sonar to play with. Anyway, I've saved my version as VBR Joint Stereo and it can be found at http://www.megaupload.com/?d=78I3DP87
"The real menace of our Republic is the invisible government which like a giant octopus sprawls its slimy legs over our cities, states and nation. At the head is a small group of banking houses generally referred to as \'international bankers.\' This little coterie... run our government for their own selfish ends. It operates under cover of a self-created screen, seizes our executive officers, legislative bodies, schools, courts, newspapers and every agency created for the public protection."
John F. Hylan (1868-1936) - Former Mayor of New York City
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