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From: nzm10@amdahl.UUCP (Neal Macklin)
Newsgroups: net.graphics
Subject: Re: Stereo Picture TV
Message-ID: <1762@amdahl.UUCP>
Date: Tue, 9-Jul-85 22:43:39 EDT
Article-I.D.: amdahl.1762
Posted: Tue Jul  9 22:43:39 1985
Date-Received: Wed, 10-Jul-85 19:20:40 EDT
References: <8794@ucbvax.ARPA> <814@turtlevax.UUCP>
Distribution: na
Organization: Amdahl Corp, Sunnyvale CA
Lines: 39

> In article <8794@ucbvax.ARPA> bradley@esvax.UUCP (Paul Bradley) writes:
> >
> >   It seems like all that is needed is an electrically controllable
> >polarizer in front of the screen...
> 
> This is exactly what a company in Mill Valley (I believe), California is
> marketing.  One problem is that the refresh rate per eye is only 30 Hz,
> whereas normal television is 60.  The flicker is noticeable, and you do
> have to wear glasses with electrical wires attached...
> 
> Ken Turkowski @ CADLINC, Menlo Park, CA

I think the vertical resolution is also halved, because they transmit
both left and right frames within one vertical sweep interval. (To use
standard TV bandwidth).  You then modify your TV's vertical sweep to go
twice as fast and their box connects the glasses to automatically
switch left and right as the appropriate half is being scanned.

I saw the system at NCGA two years ago and they were showing "House of
Wax" (?).  It looked pretty good to me.  The flicker wasn't annoying.
You could see the spaces between the scan lines, but they claimed you
could play with the focus to make the scan spot taller.  They also
showed a still image of a 3D line drawing which took some staring at
(at least by me) until I saw it in the proper perspective.

I don't remember the name of the company, but I remember the president's
name:  Lenny Lipton.  He wrote a book on stereoscopy that I've been
meaning to send for.  I remember him because he would pull the glasses
out of your hand if you tried to touch the lens.  He also didn't
like it if you held the glasses up to your ear so you could hear
them buzzing.  I've heard he's been better behaved at other trade shows.
I think the glasses need quite a high voltage to work, so maybe he was
worried I'd get a shock.
-- 
				Neal Macklin
				(408) 737-5214
				...{hplabs,ihnp4}!amdahl!nzm10

              [There are no opinions expressed in this article].