noise reduction allows you to remove or
reduce background noise from your
recordings
in this tutorial you will learn how to
reduce noise and audacity
open your audio file in audacity we will
be using an example file for this
demonstration
note the noise in the background
in this video we will show you how to
use the noise reduction tool in audacity
start by selecting a section of the
audio containing only the noise that you
want to reduce or remove
try the beginning or the end of your
recording or look for a good pause
somewhere in your track
you want to select enough of the audio
in order to get a good analysis of the
noise
now go into the effect menu
and scroll down to noise reduction
then click on get noise profile this
will close the dialog box and create a
sample of your noise audacity uses that
sample to analyze and extract the noise
from your signal now select your entire
timeline by double clicking on your
audio track
then go back into the effect menu and
select noise reduction again
there are three adjustable settings that
you can use to fine-tune your noise
reduction
each of these controls affects the way
in which the noise is reduced
raising them too high will remove more
noise but at the expense of some of your
audio quality
setting them too low will keep more of
your desired audio signal but it can
also retain some of the noise
so adjust these to the levels that are
satisfactory to you
the first control is noise reduction
amount
this setting reduces the identified
noise in decibels
adjust it to a point where you feel
enough of your noise has been removed
you can click on the preview button to
hear the results of your settings as you
alter them
the sensitivity setting controls how
much of the audio is considered noise
setting the sensitivity too low can
result in higher frequency distortions
in the audio
therefore set this to the lowest level
that achieves a satisfactory amount of
noise removal without introducing
distortions
the final control is frequency smoothing
this control helps smooth out possible
distortions that occur due to increasing
the frequency range of the noise being
reduced
a higher setting will make your audio
signal less clear so keep it low or even
off
the default settings work well for basic
noise removal another way to hear the
effect of your settings is to listen to
only the parts of the signal being
removed
you can do this by selecting the residue
option in the noise setting
select this option and press preview
[Music]
this is useful for finding the optimum
settings that do not damage the audio if
you can hear recognizable bits of the
desired sound in the residue it is
likely that you have set noise reduction
or sensitivity too high
now change the noise setting back to
reduce and then press
okay in this video we will show you how
to use the noise reduction tool in
audacity