Re: Software for loudness equalization?

[Ralph Muehleisen <muehleisen@xxxxxxx>]

As Mattias said, Adobe Audition will do that loudness normalization.

I've never checked to see if the loudness calc is accurate or not
(actually I don't know if it even outputs a loudness number), but even
if it is not exact, if it is close and consistent, it should do what
you want.

Ralph


Ralph Muehleisen, Ph.D., P.E., LEED AP, FASA, INCE Bd. Cert.
Adjunct Associate Professor, Illinois Institute of Technology
Principal Building Scientist at Argonne National lab
muehleisen@xxxxxxx


Ralph Muehleisen, Ph.D., P.E., LEED AP, FASA, INCE Bd. Cert.
Adjunct Associate Professor, Illinois Institute of Technology
Principal Building Scientist at Argonne National lab
muehleisen@xxxxxxx



On Tue, Apr 10, 2012 at 10:39 AM, Dave Benson <davehbenson@xxxxxxxxx> wrote:
> Dear list,
>
> I have a largish (600 item) collection of short musical sound files that I'd
> like to equalize in loudness. Specifically, I'd like to scale each file so
> that the peak of its loudness function is equal to a particular value, in
> sones, that I specify.  Is anyone aware of a software package that can
> perform this sort of equalization?
>
> I've found several implementations of loudness models online (see below) but
> they all seem designed to solve a slightly different problem. Namely, they
> take audio files as input and produce loudness values as output.  I'm
> interested in the inverse operation: taking a target loudness (and a set of
> unscaled files) as input, and producing set of scaled audio files as output.
>
> I'm aware that this problem could be solved using an iterative technique
> (i.e., by repeated adjusting each file's scaling factor until its loudness
> is close to the target), and writing a script to do this would be relatively
> straightforward.  Before writing it, though, I wanted to make sure that a
> similar script (or perhaps a more elegant solution to the problem) hadn't
> already been written by someone else in the community.
>
> Again, is anyone aware of an existing software package for equalizing a set
> of audio files in loudness?
>
> Many thanks for your help,
>
>
> Dave Benson
> PhD Candidate, Sound Recording department
> Schulich School of Music of McGill University
>
>
> * The loudness model implementations I'm referring to are
> - command line utilities from Prof. Brian Moore's lab at the University of
> Cambridge (http://hearing.psychol.cam.ac.uk/Demos/demos.html)
> - Psysound3 (http://code.google.com/p/psysound3/)
> - the Loudness Toolbox from Genesis Acoustics
> (http://www.genesis-acoustics.com/index.php?page=32)