[vorbis-dev] patents and separate entropy coding

[Borgerding, Mark A.]

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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