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All I can say for now is that it's our most often-requested feature,
and that we're not ignoring that.
One thing I would appreciate is if you could send me a small example
of a file you'd like denoised. I'm trying to collect a bunch of
examples so I'll be able to test this feature while writing it.
If you use Windows, CoolEdit has a denoising feature. It works well
for removing hissing and other constant background noises. Click and
pop removal is totally separate, and I'm afraid not my area of
> Hi, Dominic.
> Are there any plans to incorporate any denoising/hiss/click-removal
> functions in Audacity? It seems that you've got a lot of the basic
> mechanisms required (but not being an audio expert I'm not sure how much
> more work it would actually take).
> Otherwise, any advice on other options for denoising software that might be
> available out there in Webland?
> Martin Davis, Senior Technical Specialist
> Vivid Solutions Inc.
> Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
> Phone: (250) 385 6040 Fax: (250) 385 6046
> EMail: mbdavis@... Web: http://www.vividsolutions.com
> Wow, quick work! The sample sounds pretty good, and you're right, I think
> it's comparable to what CoolEdit or Acoustica produces. The tin-can effect
> is pretty noticeable, though. The other apps allow some tuning of the
> filter parameters (LOTS of tuning, in CoolEdit's case), which I have use to
> trade off some noise for less tin-canning. Can you expose some of the
> parameters in the UI? One thing that seems to make a lot of difference in
> CE is to increase the number of samples in the noise extract, and increase
> the number of FFT points.
Right now I have a parameter which controls the noise threshold (in dB),
I can also easily add FFT size as a parameter. I tried to add some
but it didn't seem to help much with your recording.
When I tried doing noise reduction on recordings I made that had far
noise, the results were much better. So I'm guessing that your
is contributing to those artifacts, and there's only so much you'll be
able to do.
> There's a good thread about it at
Thanks, there were some interesting points there.
> It's interesting that there are even better solutions... there's a challenge
> for you (as well as a way to make a real name for Audacity!)
I've been discussing this with Paul, who wrote some of the other effects
Audacity and is studying this type of thing in school right now. He
he can improve on this algorithm and he'll do so when he has time. In
meantime I'm happy that Audacity has something at least half-decent for
If you have access to a Mac or Linux system I can send you the program
try out; otherwise you'll have to wait a while for the Windows version;
Windows project files are in pieces on the floor. :)