[vorbis-dev] patents and separate entropy coding

[Jack Moffitt]

Exactly.  This is hte kind of observations and dicussion which will get
us more data than we already have.  With specific references we can
create a living document about it and post it online.

Please keep it up :)  And don't limit yourselves to the one patent :)

It would be best to attack the Mid/Side stereo patent, since that is the
most evil for us.

jack.

On Fri, Dec 15, 2000 at 03:17:27PM -0500, Borgerding, Mark A. wrote:
> You've probably already attacked this claim, but here's my $0.02:
> 
> 	Claim # 10
> 	10. A coding process according to claim 9, further comprising the
> steps of: 
> 	utilizing different code tables for different spectral ranges; and 
> 	setting borders between the different spectral ranges dependent upon
> the signal. 
> 
> Since Vorbis does not separate the frequency ranges via a filter bank, it
> cannot use "different code tables for different spectral ranges".  Right?
> 
> 
> > -----Original Message-----
> > From: owner-vorbis-dev at xiph.org [mailto:owner-vorbis-dev at xiph.org]On
> > Behalf Of Jack Moffitt
> > Sent: Friday, December 15, 2000 3:09 PM
> > To: vorbis-dev at xiph.org
> > Subject: Re: [vorbis-dev] patents and separate entropy coding
> > 
> > 
> > > Roger, sorry 'bout that. I am talking about patent claim #US5579430
> > > which is entitled Digital encoding process and can be found at
> > > http://www.delphion.com/details?pn=US05579430__
> > 
> > You are talking about patent #US5579430
> > 
> > What you quoted from the patent is NOT a claim, even though it is
> > similar.  It's just the abstract.  Abstracts tend to be broad.
> > 
> > Clicking on "expand details" and hunting down the page for "Claims"
> > Gives us:
> > 
> > Under Claim #1, it says "transforming the samples of said acoustical
> > signal using a transform/filter bank"
> > 
> > Note "transform/filter bank".
> > 
> > Vorbis does not use a filterbank.  This is a specific reference to the
> > polyphase filterbank stage that is BEFORE teh mdct in Mpeg audio
> > encoder.  Vorbis does not use this stage, and therefore our audio
> > encoding process is different.
> > 
> > This patent is broad though.  You could claim it covered many things,
> > including things like jpeg.  I don't think claim #1 would stand up.
> > Some of the more specific claims (delphion shows a total of 
> > 32 claims).
> > 
> > So now that we all understand how to reference patents and 
> > claims, this
> > discussion should get much more to the meat of any problems :)
> > 
> > jack.
> > 
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