[LAU] Normalizing Audio Levels using RMS

[Peder Hedlund]

Quoting Paul Davis <paul at linuxaudiosystems.com>:

> On Tue, Apr 14, 2009 at 10:23 AM, ben <brouits at free.fr> wrote:
>> Viktor Mastoridis a écrit :
>>>
>>> Hi Linux Audio Geeks
>>>
>>> In my musical prehistory, while I was on Windows, I used to use a
>>> program called SoundForge that had one very useful feature: normalizing
>>> audio levels with RMS, even using the Equal Loudness Contour
>>>
>> - normalize, a simple batch with CLI [nomralize-audio, in debian]
>>  http://normalize.nongnu.org/
>
> AFAIK, neither of these programs normalize using RMS

 From what I can see in the README  
(http://normalize.nongnu.org/README.html) normalize uses RMS, or at  
least an implementation of it:

"The volumes calculated are RMS amplitudes, which correspond (roughly)  
to perceived volume. Taking the RMS amplitude of an entire file would  
not give us quite the measure we want, though, because a quiet song  
punctuated by short loud parts would average out to a quiet song, and  
the adjustment we would compute would make the loud parts excessively  
loud."