Re: Noise Reduction
Re: Noise Reduction
- Subject: Re: Noise Reduction
- From: Andy Peters <email@hidden>
- Date: Wed, 26 Sep 2012 10:28:13 -0700
On Sep 11, 2012, at 10:35 AM, Seth Willits wrote:
>
>
> I have a need to apply some filtering to an audio track to cut out the background hiss/noise. I believe what I'm after is a Noise Gate. In Audacity and Amadeus Pro there is a feature to do this, where you select a region which has just the background noise, it profiles it, and then you can apply the filter to the entire track. I figured something like this would be commonly available from somebody as an Audio Unit (if not Apple themselves), but I haven't found one.
>
> Anybody know of a go-to solution for this?
I can't think of a go-to solution for it, but you don't want a noise gate -- you want an adaptive noise canceler. The code for the noise canceler is relatively straightforward; the filter itself is the typical FIR and the adaption loop is either the standard Least-Mean-Square (LMS) algorithm or a variant. Lots of literature about it.
This is something that I've threatened to write as my way of learning how to do an Audio Unit, but I can't get past the basics of AU quite yet, and every time I sit down to try, the tools change.
All of that doesn't help, of course ...
-a
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