From: salnick@dejavu.spk.wa.us (Bob Salnick)
Subject: Re:  Low end VR
Date: 9 Oct 91 04:31:04 GMT



I have been following this discussion with more than a little interest.  The 
subject below is, of course, standard interlaced NTSC video.  

[brief digression...]

There are several devices of the sort that synch LCD shutter glasses (XSpecs 
for the Amiga come to mind - but then I use that machine...) to the vertical 
synch pulses in the video.  The net result is that each eye gets to see only 
half of the frames that are displayed.  I have some neat demo software, and 
libraries which programmers can use to make more displays...

[now the connection...]

It shouldn't be a huge hardware hack to take the signal which would be used to
feed the XSpecs (or whatever) and use it to control a fast rf flip-flop to push
video to alternating displays.  Of course, some difficulties with loosing
horizontal synch in the blank period between frames might be expected (or 
countered by feeding *only* the h-synch to the blanked display).

Each display should get 1/60 second frames every 1/30 second.  There will
undoubtedly be flicker, but this is low-end VR.

bob

Bob Salnick, Spokane,WA |  USENET:     oliveb!isc-br!tau-ceti!DejaVu!salnick
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