It can remove pre-amp noise, noise from the microphone circuitry, cooling fan noise from some video cameras, airconditioning, road hum etc., and if reasonably constant some types of wind noise.īy keeping the original file, you have access to the unedited version if the noise reduction proves detrimental. You run noise reduction once on the selected ' noise' to calibrate and a second time having selected the whole recording to remove the noise. For long recordings this may occur naturally and one should be included in each sub-file you have created from the master. You need to select a part of the recording that represents a typical sample of the noise you are trying to remove the selection area will have a clear background.įor any recording you should include a few seconds without the birdsong or other extraneous noise - this is the typical sample of noise mentioned below. Normally for bird identification purposes you can use noise reduction if the noise to signal ratio gives the signal a chance - practice gives you experience. Noise Reduction will only efficiently remove a background hiss or other noise that is fairly constant - clearly anything in the same frequency range as your noise will be degraded to an extent that varies with each recording for some uses noise reduction may be counter productive.
The software will recommend a figure and this will usually prove optimum. You then amplify it with the clipping box unticked. If you have a very long recording you will frequently find that editing it into suitable shorter sections makes any corrections easier and more effective.Īmplification for very weak/low amplitude recordings may well give noise reduction a better chance to identify and subtract noise without too great an adverse effect on the recording.įor this one merely selects the whole of the recording or sub-section. Usually the first thing folks do is noise reduction, though this may well prove to be the wrong first step. The functions are accessed through the Effects Tab Copy it into and edit in a different folder. You are quite right, repeated re-editting is not good which is why rule No 1 is to keep your original somewhere safe where you are not going to overwrite it.
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