Five Tips to Reduce Noise in Audio Files
One of the reasons that digital audio is so popular is the almost complete lack
of noise in professionally recorded music. Those of you old enough to remember
vinyl records can also remember the pops and scratches that where an inevitable
part of the medium.
That doesn't mean, however, that all digital audio is noise free. Many types of
recordings done under non-professional conditions may have background noise or
even digital distortion. If you have a noisy audio file, here are a few tips to
make it sound better.
1. Use your ears to determine the source of the noise. For example, a voice
recording may have background noise below a certain level. Recordings made from
cassettes or records may have a constant hiss or popping noise. The type of
noise will determine how you can reduce it.
2. Choose the appropriate software for reducing the type of noise in your
recording. Some software is specifically designed for transferring analog
recording such as cassette tapes and vinyl records to the digital format. This
type of software has special filters for reducing the type of noise found on
this media.
3. Don't try to remove all of the noise. It is usually impossible to remove only
the noise -- you will also be taking out some of the source audio that you wish
to keep. There is a balance between the amount of noise reduction that can be
achieved without deteriorating the source material.
4. Try to use a filter which targets the audio spectrum of the noise source. For
example, background noise may be removed by applying a gate which only allows
audio above a certain threshold to be heard.
5. Be prepared to experiment with different settings to get the best results.
Sometimes allowing a little extra noise to remain also gives the resulting audio
much more presence resulting in a better sounding and more lively recording.
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