[linux-audio-user] Noise removal, what filter is best?

[RTaylor]

On Mon, 25 Aug 2003 22:17:43 +0100
Tim Beauregard <helycos at lycos.co.uk> wrote:

This looks impressive
http://www.csounds.com/developers/html/dnoise_8c-source.html

This is impressive
http://www.fmah.com/NewSite/HTML/Open/FMAH%20Open%20Denoising.html

But I think it's only windows. It would be cool if maybe you could talk
him into porting it though. :}

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> Hi,
> 
> I'm looking for a filter/software to remove noise from a sound file.
> I'm not an audio expert so will try to describe the noise in a way that
> you out there might be able to put a name to it and recommend a suitable
> filter/software to remove it.
> 
> It is a short sharp blip, fairly high frequency, sounds like a compass
> point stabbing glass.  It occurs as often as every minute or so in the
> two hour sound file.  I obtained this file by recording DAB radio here
> in the UK.  I'm presuming the noise is derived from errors in the
> transmission or analogue to digital conversion phase of the broadcast.
> I think it is due to a signal exceeding line volume.
> 
> I've tried the gramofile filter 'Conditional Median Filter II', which
> failed to remove the noise.
> 
> If necessary I could email a sample of the noise.
> 
> I'm using Debian 3.0r0, 2.4.18 kernel.
> 
> Thank you in advance :-)
> 
> Tim Beauregard
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