Vorbis dev - Aug 1999 - Re: Tr: patent free format

> >  So
> >  it's closer to Dolby AC-X than to VQ. Unfortunately, I'm not
sure that
it's
> >  not patended by Dolby.
>
> Could you be more specific?  More than anything else, we need to know more
> about the patent waters we're navigating.
>
> Monty
As Dolby AC-X is using enveloppe of the sound since several years, and as it
seems that Dolby was the first one to use it, I think that using the
envelope of sound is perhaps patended by dolby.

Regards,

Gabriel Bouvigne - France
bouvigne@multimania.com
icq: 12138873

MP3' Tech: www.mp3tech.org

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> 
> > >  So
> > >  it's closer to Dolby AC-X than to VQ. Unfortunately, I'm
not sure that
> it's
> > >  not patended by Dolby.
> >
> > Could you be more specific?  More than anything else, we need to know
more
> > about the patent waters we're navigating.
> >
> > Monty
> 
> As Dolby AC-X is using enveloppe of the sound since several years, and as
it
> seems that Dolby was the first one to use it, I think that using the
> envelope of sound is perhaps patended by dolby.
This has been a technique in speech compression practically since speech
compression and synthesis began.  I doubt Dolby was using this in the 50s and
60s... Levinson-Durbin itself practically predates electrical computers.

I have a nice thick list of references if needed ;-)

But if they *do* have a patent, it's something we'd need to know about. 
The
patent would be bogus, but worth knowing about.

Monty

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