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From: rrw@naucse.cse.nau.edu (Robert Wier)
Newsgroups: sci.electronics
Subject: TV remote control codes
Message-ID: <3282@naucse.cse.nau.edu>
Date: 5 Feb 91 09:12:00 GMT
Article-I.D.: naucse.3282
Organization: Northern Arizona University, Flagstaff AZ
Lines: 35


 Occasionally I have seen discussions here regarding the 
 remote controls used in tv/vcr/etc circuits.  All of a 
 sudden I need some information on this quickly (for a 
 student demo lab we are trying to set up by Feb 22nd).
 I have an IR receiver circuit, and have been looking at
 the pulses coming out of it (from a Magnavox remote) on 
 a scope.  What looks like is happening is that there 
 is an initial burst of information which is complex, followed
 by much simpler repeats.  I seem to recall that the initial
 burst is a manufacturer/device ID so that conflicts between
 different pieces of equipment can be avoided.  The pulses are
 sent at about 40khz.

  Widths between pulses (which I assume denote a new
 "number") are on the order of 1.8 ms.  

 So I'm seeing a lot of stuff, but I don't know what I'm looking
 at!  I'm certain that Don Lancaster or Steve Circida (sp?) has
 had things on this in the past.  If anyone had been experimenting
 with this, I'd greatly appreciate any suggestions on reference 
 materials (RE? Byte? Circida's Circuit Cellar? IEEE? ... etc).

 If there is a standard on this, I'd really appreciate a reference.

 Please either e-mail me or post here.  THANKS!


 - Bob Wier

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                      College of Engineering
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