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From: janowsky@huma1.UUCP
Newsgroups: comp.dcom.telecom
Subject: Re: phonevision
Message-ID: <2241@husc6.UUCP>
Date: Mon, 8-Jun-87 14:24:43 EDT
Article-I.D.: husc6.2241
Posted: Mon Jun  8 14:24:43 1987
Date-Received: Fri, 12-Jun-87 05:39:02 EDT
References: <8706052153.AA20677@jade.berkeley.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: harvard!huma1!janowsky%seismo.CSS.GOV@buit1.bu.edu (Steve Janowsky)
Distribution: world
Organization: Harvard University Physics Department
Lines: 22
Keywords: data compression
Approved: telecom@buit1.bu.edu
Summary: Data compression allows faster refresh


In article <8706052153.AA20677@jade.berkeley.edu> SPGDCM@CMSA.BERKELEY.EDU
(Doug Mosher) writes:
.>
.> MINX adds what they call "voice and full-motion video" to PC communication
.> networks. It appears that you add a Datapoint monitor-camera combination to
.> some sort of IBM PC; presumably the same monitor is used at other times for
.> high quality color graphic monitor use.
.>
.> I have no idea what quality; certainly some teleconferencing video is
.> limited scan, like 2 per second or whatever; their term "full-motion"
.> is interesting.

I believe that data compression techniques allow something like "full-motion"
video.  When you're speaking (for example) your lips move but most of the
tv screen remains constant -- and thus only the lips need to be re-
transmitted.

Of course this is a gross oversimplification, but...

Steve Janowsky	(janowsky@huma1.harvard.edu
		 ...harvard!huma1!janowsky)