Here’s the real-world sample. From vinyl, complete with vinyl surface noise and hum.
– Bill
I remember that in that very long thread I started when I first joined this forum I posted a few samples of my tests with the T-Bone USB micplug that were noisy. I can also record a few more samples if you’re interested.
I have started a wiki page here: Missing features - Audacity Support
I think I have covered most of those points, but I have done so following the standard wiki Proposal format.
I’ll upload, or link to some suitable test samples shortly, but at present Flac files cannot be uploaded to the wiki.
If anyone has good real-world test samples, please post them here.
Test samples should be in Flac or WAV format, and should contain both “noise only” and “noise+signal”.
Maximum file size should be 1 MB.
Maximum file size should be 1 MB.
I still don’t think three seconds is enough for good analysis, particularly if you have to wait for a silent portion in the performance.
Koz
1 MB in FLAC format will allow about 10 seconds stereo 16 bit 44.1 kHz.
I’ve been testing the new “Noise Coring” effect by Jérôme M. Berger http://wiki.audacityteam.org/wiki/Proposal_Noise_Removal
Here’s a sample of the effect.
The first sound is the original unprocessed sound. It is followed by a “cleaned” copy using the Noise Removal effect in Audacity 1.3.13, and finally a copy of the original that has been processed with the Noise Coring effect.
On my ears it sounds better than audacity’s noise removal 
The sound is not so muffled, keeping some of the brightness of the original recording.
I agree, and another notable feature is that it does not have any of the metallic/bubbly artefacts that are common with Noise Removal.
The effect is specifically designed to deal with “hiss” type noise and I think that it’s showing great potential.
I’d score it 8-2 to coring. The first half second of the Noise Removal attempt sounds really clean to me (better than coring), but then it deteriorates like Steve describes and gets more muffled (borne out by Plot Spectrum, almost nothing above 6000 Hz in the Noise Removal sample after about half a second). But I get a pulsing artefact at 23 s with coring in the dying away that is more noticeable than in noise removal (it is more evident in speakers than headphones).
I’m a bit concerned with yet another effect to try and get your noise removed whereas most software only has one effect. How many controls does noise coring have? I never tried the patch.
Gale
What were the settings in the Audacity Noise Removal effect? That’s some pretty extreme noise removal.
I still think Davies’ DeNoise sounds better His maximum setting is 25 dB NR, after that the control just reads “maximum reduction”. Even at that setting there is little if any dulling of the guitar sound.
– Bill
It’s still quite early days for the Noise Coring effect.
Currently there are 4 controls, two of which set the “noise profile”, 1 sets the FFT size (which can probably be fixed as the default seems to work well with everything), and the 4th slider sets the amount of reduction. If the effect used a “Get Noise Profile” method, then the number of controls could probably be reduced to just one slider, or even be completely automatic.
If this effect was separate from the Noise Removal effect, then I’d suggest calling it “Hiss Removal” (or something similar), and for users it could be a much simpler option than “Noise Removal”.
Alternatively it could perhaps be included in the current Noise Removal effect.
The Noise Coring effect is only suitable for broadband noise (hiss), but that is a very common type of noise, and this effect looks like it will be highly effective and simple to use.
I’ll post again when there’s more news.
There are a few great looking noise filters ive seen that look like they got stuck in development.
Im wondering when these are likley to make it in to audacity?
Or if there is a way to get a build with these already implemented?
These two:
Noise Coring
http://wiki.audacityteam.org/wiki/Proposal_Noise_Removal#Noise_Coring
( https://forum.audacityteam.org/t/disabled-features/201/1 )
( http://audacity.238276.n2.nabble.com/Noise-coring-filter-td7555895.html )
Spectral Subtraction
http://wiki.audacityteam.org/wiki/Proposal_Noise_Removal#Spectral_subtraction
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Any updates on the progress of this noise coring?
Please stop making similar posts in different topics. They only have to be moved by a moderator 
Gale
Unfortunately we’ve not heard from Jérôme M. Berger for several years, so until unless developer decides to continue that project we are not going to see it progress.
Noise coring is now available as a LADSPA plugin here: https://bitbucket.org/jmb/ladspa-noisecoring/
Hi Jérôme, nice to hear from you again
I’ve just downloaded the Linux build, and from a quick initial test it looks very impressive.
Could I suggest that you start a new topic for your new LADSPA plug-in (new topics tend to get more attention than old threads).
Do you refer to carving out noise frequencies as known from CoolEdit 2000 (long time ago)? I liked the preview and the option to define the frequency range of the carving.
This thread shows that there is a lack of documentation of the used noise reduction philosophy. After having used Audactiy for decades now, I think a noise gate alike trigger policy is used, hence the noise flags. Also I learned that deep frequencies like net hum is not regarded as “noise” which, hence the low freq ignorance. The subtractive policy should be nice, also a visual preview of the applied alogrithm.
The built in filters should also offer a “dry” playback to compare the result without applying. But this is something for the feature request.
I appreciate the open source concept and the new wide range for third party plugins.
P.S.: Do you know the high blend filter FM tuners use to eliminate spherical noise in high frequency bands by partial mono-mixing?