Hi, anyone knows a plugin to remove noise already recorded tracks for use in ardour?
Yeah, I have yet to get GWC to do anything but crash on large WAV and AIF files.
When I have tried smaller files, and it didnât outright crash, I couldnât get anywhere near the results that the author shows in his demos.
GWC tends to suffer from the, âIt may be good but dang if I can figure it outâ side of things. I havenât actually heard good results that compare to Izotope RX2 for example out of it.
Wasnât ignoring your question by the way, but others have touched on it, do you want me to go into details still?
Seablade
Sophisticated NR plugins require a substantial investment of time and resources, to do right, and no one has been willing to do that, yet.
If it is just hi-freq-noise, what about an equalizer?
ânoiseâ is a pretty vague term.
Look at http://www.cedar-audio.com/ for a broad range of techniques for dealing with different problems that can all be described as ânoiseâ. (None of them is free, though)
The noise removal plugin that comes with audacity is good for tape hiss, AC power hum or anything else with a constant level and frequency. It works by subtracting the noise spectrum from the signal. Itâs useless for many other types of noise. I donât know if that can be made to work with Ardour.
Reducing randomly timed clicks and crackles like those on old vinyl records can also be done effectively by a quite different technique, and there are many software tools dedicated to that function.
seablade: I have no other professional tool to compare, but if you say so.
What is the reason for this? Are the good noise cleaning algorithms all under some patents so we donât find any of the good ones in FLOSS tools?
In any case, I imagine that if professional quality is that important, one would not record with low quality hardware from the start (well I guess I actually do see one case where you want to do this still for professional reason: when you want to recover very old recording, of high artistic quality).
The short is it doesnât come close to comparing to professional solutions, it is vastly better than it was a few years ago yes, but still not much of a comparison.
But if quality isnât that important, then go ahead and give it a shot;)
Seablade
Hi,
I donât know if thatâs appropriate on these forums to speak of another program, but I did this kind of thing with Ardour just a few days ago to clean very bad audio recorded with the crappy integrated sound card of my laptop.
I used the noise removal effect: http://wiki.audacityteam.org/index.php?title=Noise_Removal
And it worked pretty well. So obviously the best is to have good hardware (sound card, microphone, etc.) so that you donât have to clean anything; but other than that, it is a nice use of Audacity.
Now I donât know much about Ardour or any other program (not even about Audacity). I am not a professional audio guy, so my opinion is worth what itâs worth.
Nothing thatâs good enough to actually use.
I had to compile GWC from source and tweak a little bit to get it, but I did a good work restoring an old cassette tape. You canât edit, cut files with it because it crashes a lot (I used Audacity for that), but I could remove a lot of hiss a clicks better than audacity.
Hi, this was a good start for me:
http://www.penguinproducer.com/
⌠under: Documentation > Tip > LADSPA Noise Removal.
Hope it helps.
Cheers.
I havenât tried this but I was reading that if you leave some âsilenceâ on your track and select a segment of it (that has a guitar hum or whatever noise youâre trying to get rid of) then copy it to a new track and duplicate the copied region so that it fills the same time frame as the other track. Then you can reverse the phase on the second track and it should cancel out the noise in the first track.
That âreverse phaseâ cancellation doesnât work. The copied ânoiseâ wonât correlate with the noise you are trying to cancel, so youâll end up just adding more noise. I think somebody has misunderstood the Audacity noise reduction tool I descried in an earlier post on this thread, which does take a sample of the pure noise, but then does something much more sophisticated with it.
If itâs a very constant frequency hum or other periodic tone, you might be able to adjust the timing do do it that way, but it would be very tricky and unreliable (half a cycle out and youâre DOUBLING the noise!) and youâre probably much better off with a sharp notch filter or delay+invert set to 1 period of the tone you wish to cancel in that case.
Maybe you should first locate the noise-source.
Probably a noise reducing plugin for Ardour would not be the ticket at all.
Does the noise come from your (maybe even analog and not yet sampled) audio source?
Does the noice come from Ardour?
Is the noise reasoned by some signal-source behind Ardour?
So far I know is the noise-distance even in the cheapest audio-cards far away from bad.
The software or the switching of registers doesnât (so far I am right) lever the noise as well so you are probably working with quite a good signal/noise ratio as is.
Iâd check your equipment and in particular cable-connections.
Tremendues noise can result from bad connections, cold soldering etc.
Greets
Gee
PS: any additional plugin in the chain (even hypotetically) adds another noise-source, we are clear about that right?
ah sorry mistake on my side , now it worksâŚ
Iâm working on one. Itâs in lv2 format. To this day itâs pretty alfa but itâs working. Itâs called noise repellent. Check it out https://github.com/lucianodato/noise-repellent