[vorbis-dev] Re: Speex: Open-source, patent-free speech coding

[DSPguru]

Hi Jean-Marc,

> The only potential problem is the one where two people are talking at
> the same time. In this case, the solution could be to just boost the
> bit-rate for a couple frames.

are you sure this will give us good results for both voiced and unvoiced sounds ?
i'm asking because this could raise an alternative solution.
assuming with have two speech signals, s1,s2. if Speex can encode
s1+s2, it should be able to encode s1-s2, as well. right ?
in this case, our "common" track could be the original english (s1)
soundtrack encoded at ~100kbps vorbis, and the german track (s2) would
be encoded as speex of s1-s2.
that way we have better compression-gain, and better quality for the
default soundtrack.
Beware, developers, we would need to define some comments strategy to
the ogg, to be able to hold info about languages. 
so in the future, each user could choose its prefered langauge, and the
player should be able to supply it by default (if available).

<p>> 
> > the first step is :
> > - decide how we extract the 'common' track
> 
> I'll leave that one to you. I have no idea about the properties of the
> different tracks.

ok. maybe anyone else in the list have ideas ?

<p>Best Regards,
Dg. http://DSPguru.doom9.net

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