Terje,

Try Cinelerra filters "EQ Parametric" and "DenoiseFFT".

For DenoiseFFT, you'll need an uninterrupted noise sample, longer is
better (see the filter settings for exact length). Paste the noise
sample at the beginning of your audio tracks immediately preceding your
valued content (exclude from rendering with in/out points or markers).
Too much Denoise power adds unpleasant artifacts to your audio. My
experience so far is that DenoiseFFT can improve the clarity somewhat,
but forget about perfection. Good luck!

Craig.


Stefan de Konink wrote:
> On Tue, 1 Jan 2008, Terje J. Hanssen wrote:
>
>   
>> Typical audio problems when recorded with the built-in mic on camcorders
>> can be:
>>
>> - outdoor wind noise (too weak person voice)
>>     
>
> This is hard to compensate. Noise is generally a distribution of 'sound'
> on all frequencies. Some techniques like selecting a speakers speech
> frequency can be done with tools like 'Praat'. But seriously, these things
> are beginner errors, and should be teached how to avoid, not mask...
>
>   
>> - "zoom or direction stereo mic" decreasing bass and increasing treble
>>     
>
> I think any serious Linux audio tool can do this. Audicity[1], Praat[2],
> Ardour[3]...
>
>   
>> - other background noise in between (too weak voice)
>>     
>
> If you are able to design or use a designed filter (mathematically) you
> can use it within Praat. So export a wav, process and save. Maybe in the
> future Praat will support video, but now there are other priorities ;)
>
>
>
> Stefan
>
> [1] audicity.sf.net
> [2] praat.org
> [3] ardour.org
>
>
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>
>
>   

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