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 (nobody)...and 180 guests Last 5 registered Oplandisks nothingstar N_loop yipe foxtrotromeo Browse members... |
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I remember using noise reduction in cool edit years back- basically highlight a "quiet" (in the sense that it only had the background hum/whatever you were trying to eliminate) bit, then get it to remove similar frequencies/sound from the whole file. Nothing miraculous, but it improved things a bit. I was just wondering what the contemporary standard for noise removal is and if there are any programs/plugins you could recommend for it? TIA |
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What kind of noise? You can use vocal reduction techniques to remove hums. |
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Perhaps we should all just shut the fuck up! Hows that for noise-reduction? A plugin mostly used on other kinds of pigs, is the Apple. Usually it's big enough to keep any noise from coming out, while still allowing the subject to breath. And it's biologically approved too! |
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yeah - the waves bundle has some great noise reduction plugins |
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Audacity has a noise remover, but I've never actually used it to remove proper noise... |
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i know this guy on this message board that goes by the name "Noise" i'm trying to get rid of him >_> <_< |
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A few different kinds (in different files) but all reasonably low frequency, so highpass filtering should be an option too. Loudly humming boiler in one, some weird tone that I can't work out what it was (constant pitch like a fire alarm in the distance). Ta for the recommendations. |
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Constant pitch should be easy to remove. Do an audio analysis of a quiet section with the tone present. i.e. a FFT or whatever, so long as it is in the frequency domain, locate the fundamental and harmonics of the tone and apply digital notch filters on the whole track to kill them dead. The digital filter can have mad settings like 1Hz bandwidth and also doesn't cause phase shifts like a 'real' filter, so it can be used like a scalpel with surgical precision. Best cure for noise is not to introduce it in the first place. Use balanced cables where ever possible and avoid ground loops. [sound on sound did an excellent article on this a while back. I'm currently too tired to attempt a link, but google it by all means] Optimise levels to get the best signal to noise ratio and try and drive A/D converters as close to 0dBFS (i.e. max input) as possible so quantisation noise has less effect. Use the lowest noise amps as the main gain elements. Ensure inputs are high impedance, and outputs low impedance. Do not use those 2 into 1 plugs, use a proper mixer so all the inputs are isolated and buffered. Use decent cables. Run D/A converters as loud as possible in software and then reduce volume on the mixer, this stops bit reduction. Since digital won't add noise, it's best from a noise perspective to digitise a signal with a good A/D converter as soon as possible and leave it in the digital domain for as long as possible. I'm afraid my knowledge is from an electronic perspective, not audio, can't help to much with backround noise on field recordings! |
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The one in cooledit is still brilliant. You just have to use it the right way. Remove the noise, but not 100%, more like, 40% or something, and then create a new noise profile, set it to 70%, and then a new, and then a 100%. You won't get that metallic/digital sound to it. |
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