el Mon, 25 Aug 2003 23:56:36 +0100 Tim Beauregard <helycos(a)lycos.co.uk> escribió: i can't remember if it was already present in 1.1.3, but in 1.2.0 there's a noise removal plugin (not the fft filter plugin). it works like many other similar plugins: first you select a portion of your file where there's only noise, no signal, then the program designs an fft filter based on that noise. that filter is later used it to remove that noise from all the file or whatever part of it you select. i used to use a similar plugin in windows, this one is simpler but seems to work in it's way. the principle is simple enough. i _think_ snd has a similar function, but you won't find it in any menu, you'll have to type some command in the listener (never leaned to properly use snd myself...).

On Mon, 2003-08-25 at 18:56, Tim Beauregard wrote: I'm using version 1.2. Select a portion of your noise, select the "Noise Removal" option from the effects menu and follow the instructions in the dialog box. -lee

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Anahata wrote: | Noise removal tools like that in audacity are for removng a constant | background hiss or hum and would not be suitable for an occasional loud | sqeak. I'm surprised that gramofile does not do anything for it, but I I could wade through all the filters and tweak them til I get a (near) satisfactory result. | think your best bet in this case may be to use a sound editing tool like | audacity and manually cut the noise blips. If they are much highe | amplitude than the normal sound they should show up on the display; | otherwise you'll just have to locate them by ear. When you find one you | can either cut the noise out (shortening the recording by the length of | the section you've cut out) or use the amplitude envelope tool to make a | rapid fade out/fade in over the noise. The first method will cause a | time discontinuity: the second may cause an audible droput in the sound. | It depends on the nature of the recorded material and the length of the | noise burst and you'll have to experiment to see which is the least | objectionable. Good advice, sometimes I can see the sound, sometimes not. Will try the fading technique. | If the noise is at exactly one frequency, it may be possible to select | a short section containing the noise and apply a filter with audacity, | with a deep notch at the frequency of the noise. I wouldn't advise | applying such a filter all through the recording because it would | probably not sound very nice, and it's a pity to spoil a minute or good | sound just to reduce the effect of a fraction of a second of noise. | Again you'd have to do this for each noise burst, but with a bit of luck | (i.e. if the frequency is the same each time) the same filter setting will | work on each one. And this is worth a try too. Lots to get my teeth into. Thanks aplenty. Tim |

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 RTaylor wrote: | On Tue, 26 Aug 2003 08:38:07 +0100 Anahata <anahata(a)treewind.co.uk> wrote: | | I have a bunch of files like that... | | I used a demo denoiser that I mistook as freeware... and stupidly deleted | the originals before I listened to the real output of the program. | | The only way to really remove them is to cut them out. Seeing as they're | evenly placed... You can create some nifty sound samples by altering the | pitch a bit and putting a delay on them. Some of it sounds pretty gorgeous. | | The best thing I've found for noisecarving is a program called in-tune | {Australian... I believe it's been competed away by some commercial | program called intune} It's windows like d/noise. If you can find it {I | can't} it seems like it might run under wine. {It may have even come with | source} Seems to me a lot of small windows sound utilities might.} | | I have had good luck at cleaning stuff up with just the basic tools in | snd {{reverb dontcha' know...} :} You can twist the hell out of it too.} | You might try some of the FFT stuff or even get fancy like this: | | http://ccrma-www.stanford.edu/guides/planetccrma/node48.html | | ...Maybe try mixing it with another file... | OK been wading through your suggestions, and have decided the suggestion of manual alteration of the noise within audacity will be my method. I can't get my head around the more complex software, even though I'm sure they can do what I need. Thanks so much to everyone who contributed answers. Tim

There is also: http://gwc.sourceforge.net/ - Gnome Wave Cleaner /Robert