Subject: RE: [linux-audio-dev] digigram's "ethersound"
From: John Lazzaro (lazzaro_AT_CS.Berkeley.EDU)
Date: Sat Jun 22 2002 - 00:13:44 EEST
> From: "Men Muheim" <muheim_AT_gmx.ch>
>
> > I wrote
> > http://www.cs.columbia.edu/~hgs/rtp/history.html
>
> this link seems a bit out of date! Six years is eternity in this
> business...
>
> -- men
Yes, but the expired patent mentioned is still expired:
April 1977
J. Flanagan (of BTL) applied for a patent on Packet Transmission of Speech.
July 1978
US patent 4,100,377 granted to J. Flanagan.
And this classic patent is still unexpired:
May 1988
US patent 4,748,620, Time stamp and packet virtual sequence numbering
for reconstructing information signals from packets granted to Harry
W. Adelmann and James D. Tomcik
I haven't read either of these, but I'd guess these are the baseline
intellectual property for packetizing audio, and newer patents build
on them -- if you're worried about IP on this issue, start worrying
with these, not Gibson or Digigram ...
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John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley
lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro
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