Re: mixing, acoustics question


Subject: Re: mixing, acoustics question
From: Philippe-Aubert Gauthier (Philippe-Aubert.Gauthier@USherbrooke.ca)
Date: Thu Jul 29 2004 - 15:24:55 EDT


In a theoretical world, we could say that x+x+x=3x. So you simply increase the
amplitude.

In a real world, any time delay between the signals (bad positionning in your
multitrack editor, anything that give you a delay - even one sample!) will give
rise to comb-filter effects. Depending on the relative polarity of each of your
track, you will either get some dips or peaks in your freq. response. If you
send those three channels over different loudspeakers, you will get a
comb-filtering effect arising from the propagation time delay between the
listener and each of the loudspeaker. You get this even in anechoic chamber
where the comb filter is even worst when you move (you clearly feel the peak
(or the dip) moving in the freq. domain).

Selon Mediadrome@aol.com:

> What happens acoustically, if you duplicate a track on digital recorder so
> that you have 2 or 3 tracks playing the same stuff (they're all panned the
> same
> way). Theoretically, should you get phase problems? chorusing?
> thanks
>
> mediadrome
> international audiochrome, inc.
>
>

%====================================================================%
% Philippe-Aubert Gauthier, B.Ing, M.Sc. %
% Étudiant au doctorat en reproduction de champs acoustiques %
% %
% GAUS (Groupe d'Acoustique et de vibrations de l'Université de %
% [ Sherbrooke) %
% CIRMMT (Centre for Interdisciplinary research in Music, Media %
% [ and Technology) %
% %
% http://www3.sympatico.ca/philippe_aubert_gauthier/acoustics.html %
%====================================================================%



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