On Thu, 12 Oct 2006 06:10:55 +0200 'Thorsten Duhn'
posted this onto alt.comp.freeware:
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Hello,
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> MP3Gain does not just do peak normalization, as many> normalizers do. Instead, it does some statistical analysis to> determine how loud the file actually sounds to the human ear. How can it do that? How loud a noise sounds to the human ear will vary from one person to another. If the normalise level is set to high, the output will sound distorted at peak levels. If too low, it will need a high volume level on the player which will introduce excessive background noise (hiss etc).
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as it's said in short description (and I also included allnecessary links), it's not precise, it's about approximation,"some statistical analysis"...http://en.wikipedia.org/wiki/Replay_Gain
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This appears to be describing a commercial implementation of music
player features which have been around in s/w like CoolEdit and others
for years and is known as 'normalisation'.
The difference being that CE normalises the original .wavfile
whereas this technique adjusts the final player output level but
the volume levels are likely to be extremely similar at a given player
volume setting level as I described in my other post to RDF.
ReplayGain appears to scan and adjust music which has not been
previously correctly normalised and then produces a standard output
volume level to avoid the need for the user to continually adjust the
player between tracks/albums and CDs. To this extent I can see a use
for it since the variation of normalisation on commercial CDs is
appalling. Maybe one day they'll get round to doing it in TV sets too!
I tested WavGain and it adjusted a wavfile to 100% normalisation
according to CE although in CE I can choose what level to use.
That maybe possible with WavGain too.
MP3Gain does a similar thing but operates on MP3 files.
I've been using CE for 6-7 years and normalise all my music tracks
to 95-96% before burning and which delivers a perfect and consistent
output sound for all my tracks before CD burning. In this scenario,
having a player with built-in ReplayGain is superfluous.
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What you talk about is within other extreme. When I use MP3GainI mostly adjust by 1,5 to max 6 db. This is not really wherebackground noise comes in, it's just what is it's written purpose,have the files sound mostly in comparable volume. And for me itworks.
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I was simply trying to explain that when the normalisation level is
set too low in a music file, the user needs to turn up the volume to
hear it at his/her preferred volume level. This then introduces the
inherent background noise which exists in electronic players - ie
the signal/noise ratio deteriorates. That's why I always normalise
to 95-96% which means I get the highest signal/noise ratio without
background noise, no clipping at peak levels and consistency between
CDs. (Obviously in CE I also do a lot of other things too like remove
snaps/crackles/pops/clicks/scratches/hiss etc before burning.)
REQ:Volume gain for wav-files
Linear Mode
