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denoising tips

 
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alansilv



Joined: 07 Feb 2008
Posts: 31
Location: Southern California, USA

PostPosted: Wed May 14, 2008 6:09 pm    Post subject: denoising tips Reply with quote

i'm puzzled by the settings for the denoise tool in the effects menu. thru trial & error i've achieve ok results, but would like to know when to go for 'long fft' or 'short fft,' 'peaked' vs 'smooth' and how to set the sensitivity. any info is appreciated.
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Wed May 14, 2008 6:28 pm    Post subject: denoising tips Reply with quote

My recollection is that this is a variant of the "Wiener" or optimized
filter. In essence, one must have an estimate of the frequency spectrum
of the noise (peaked or smooth) and an estimate of the power (I think
this probably in the sensitivity factor.

Other notes -- it often helps to avoid artifacts if the sample noise is
copied to a new file, attenuated and then selected as the noise source.
It won't do as good a job at removing noise, but the artifacts will be less.

Chuck

alansilv wrote:
Quote:
i'm puzzled by the settings for the denoise tool in the effects menu. thru trial & error i've achieve ok results, but would like to know when to go for 'long fft' or 'short fft,' 'peaked' vs 'smooth' and how to set the sensitivity. any info is appreciated.




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Charles D. Jonah CDJonah@anl.gov
630-252-3471
Chemistry Division
Argonne National Laboratory
Argonne, IL 60439



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0db



Joined: 01 Feb 2007
Posts: 36
Location: San Francisco

PostPosted: Thu May 22, 2008 1:00 am    Post subject: Re: denoising tips Reply with quote

cd Jonah said:

Quote:
...it often helps to avoid artifacts if the sample noise is
copied to a new file, attenuated and then selected as the noise source.
It won't do as good a job at removing noise, but the artifacts will be less.


Mr Jonah: that's really cute- I like that one!

0db
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