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Noise Reduction in Audition

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Camille KatzNoise Reduction in Audition
by on Dec 27, 2012 at 11:44:29 pm

Hi everyone,

I have a clip of birds tweeting that has traffic noise in the background. I removed most of the noise with Adaptive Noise Reduction (not sure if that's the best way or if there's a better way?)and it works fine except that it always leaves 1 second of noise in the very beginning which can be very annoying as it sometimes is right on the tweet that i want to keep.
I'm new to all this so don't know much about it.
Why does Audition leave some noise and get rid of the rest?
Has it something to do with a decay level?
sorry for the stupid questions but i'm just 16!

Thanks a lot in advance!
Camille


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Angelo LorenzoRe: Noise Reduction in Audition
by on Dec 27, 2012 at 11:53:38 pm

Reverse the clip, process it and reverse it again so it's normal and you will have noised reduce the beginning of the clip. If adaptive noise reduction gives you an acceptable result (to you) then go with it.

--------------------
Angelo Lorenzo

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Camille KatzRe: Noise Reduction in Audition
by on Dec 28, 2012 at 12:09:52 am

Oh what a good idea!! thanks! it works really well!!
Is there a better way you find to reduce noise more profesionally?
thanks a lot!


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Angelo LorenzoRe: Noise Reduction in Audition
by on Dec 29, 2012 at 9:33:28 pm

There are. I'll try not to get two technical but there are two types of audio noise: broadband noise and narrowband noise. Think of broadband noise as trying to make out the figure of a person in fog. You have to remove a lot of fog to see the person. Narrowband noise is like seeing a painting that's all green but has one red dot. It's usually pretty simple to remove the one red dot without leaving a trace, or maybe a small trace.

Broadband noise is reduced with Adobe Audition's reduce noise filter. This filter allows you to select an area in your file that is all noise. The filter will create a noise "fingerprint" from the sample. You can then select the entire wave file and apply noise reduction. Many people try to reduce all the noise in one pass but I suggest taking a fingerprint and reducing noise in small amounts, taking another fingerprint, reducing a little more noise, and so on.

Narrowband noise can sometimes be removed with Audition's spectral healing tool (I suggest you look at Audition's help file). This is useful for removing brief noises that aren't part of the frequencies that make up human speech. Think of the beep of a fire alarm.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks


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Camille KatzRe: Noise Reduction in Audition
by on Jan 1, 2013 at 4:10:31 pm

Thank you very much for your good advice! It has helped me a lot!
May you have a wonderful new year!

Camille


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