[vorbis-dev] patents and separate entropy coding

Monty xiphmont at xiph.org
Fri Dec 15 12:04:54 PST 2000

> 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__
> It patents "A digital encoding process for transmitting and/or storing
> acoustical sigs and, in particular, music signals, in which scanned
> values of the acoustical signal are transformed by means of a
> transformation or a filter bank into a sequence of second scanned
> values, which reproduce the spectral composition of the acoustical
> signal, and the sequence of second scanned values is quantized in
> accordance with the requirements with varying precision and is partially
> or entirely encoded by an optimum encoder, and in which a corresponding
> decoding and inverse transformation takes place during the
> reproduction."
> I'd say that that is what Vorbis does, although I haven't looked at the
> algorithm very closely.

READ THE ENTIRE FRICKING PATENT PLEASE.  Sorry for the all caps folks,
but your arguments thus far are totally irrelevant.  The description
is a general abstract.  It holds no water.  Only the claims matter
POSTING ANYTHING MORE.  You're all generating misrumors that will just
come back to bite.

Jack, do you think it's a good idea to post my detailed patent reading
we did as a first round for the original IP work?  It's good meat, but
would potentially be giving the meat of our argument away to Thomson
if this ever does come to litigation.  Regardless I think it's best to
have it out in the open.


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