Hi I noticed that the new noise reduction does not seem to have the attack time adjustment that the older version had. This makes it very difficult if not impossible to clear all the low frequency noise out. I can get the highs and mids clear , but not frequencies below 100 hz. and into the sub sonic region. Since I have the old version on a windows 7 machine and the newer one on a windows 10 I could do some filtering on the new one and then transfer to the older one to finish the job but it would be nice if the newer one was adjustable. Any tricks up your sleeve?
How old is your old version of Audacity? The Noise Reduction effect has not changed significantly for many years. Is the effect called “Noise Reduction” in both versions of Audacity?
It is old like 2.0 something , I haven’t had that one on in a while but I think it is noise "removal ". In order to take it all out , it takes several passes sampling the noise each time but it is possible to remove most if not all the noise with it. I restored some old cassette tapes using it and it was a lot of work but it sure made a difference. With digital recordings it’s much easier because there isn’t as much there to begin with. If I could some how take that noise removal and plop it into the newer version I would be dancing.
The old Noise Removal effect is only available in old versions of Audacity, because it is a built-in effect.
The “Noise Reduction” effect is a slightly tweaked version of the old “Noise Removal” effect, with a lot of bug fixes. In extensive testing, the new version was found to be as least as effective as the old effect in nearly all cases, though requiring different slider settings from the old version.
The name was changed from “Noise Removal” to “Noise Reduction” because we found that a lot of users were trying to completely remove background noise rather than just reduce the level of background noise, but this kind of effect works best when you tweak it to reduce the level of background noise but not so much as will cause noticeable squeaks (metallic bubbly noises).
Old versions of Audacity are available from FossHub.com.
Hi I know how easy it is to distort the signal if you try to remove too much too soon but that’s why I take several passes and start with low depth and long attack time then with sampling the noise before each pass , and increasing the amount or depth gradually,while shortening the attack time , it was possible to remove all the noise without producing any noticeable distortion . Then the lows can be boosted without sub sonic rumble becoming a problem. Then reverb can be added in a similar way to take the place of the noise floor. I also use acoustic damping to reduce the natural room reverb and limit room modes. I could have reduced e.m. noise further with a Faraday cage around the framing before dry wall , but it would have raised the cost too much. I think a good feature would be a way of measuring distortion , maybe built into the spectral analysis.
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