For
people who
listen to
music on their
computer, a big
problem is the varying
volume which the
sound comes out of the
speakers. This problem is especially bad with headphones. As an example, someone is listening to
Nirvana and they have adjusted the volume to their liking. Nirvana's
song ends and
Soundgarden comes on. Soundgarden's music
file may specify a different volume, making the sound very loud or very quiet.
Volume normalization
attempts to take care of this. By analyzing the volume on each file, it can try to
compensate for the ones which are
louder or
softer, making them come out of the speakers all at about the same volume.