Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!im4u!ut-sally!seismo!cmcl2!beta!unm-la!unmvax!charon!deimos!f12008ad
From: f12008ad@deimos.UUCP
Newsgroups: sci.electronics
Subject: Re: Full duplex intercoms?
Message-ID: <649@charon.UUCP>
Date: Wed, 25-Mar-87 12:26:21 EST
Article-I.D.: charon.649
Posted: Wed Mar 25 12:26:21 1987
Date-Received: Sat, 28-Mar-87 02:45:14 EST
References: <1922@ihlpl.ATT.COM> <562@puff.WISC.EDU> <3972@fritz.UUCP> <18003@ucbvax.BERKELEY.EDU>
Sender: news@charon.UUCP
Reply-To: f12008ad@deimos.UUCP ()
Organization: University of New Mexico Computing Center
Lines: 13


	Concerning the half-duplex situation with intercoms...

I believe the reason why only one person can talk at once is simple.     
Most intercoms have a flush-mount speaker, as opposed to a headset.
If there were dulex communications going on, the other party would here their   own voice relayed back to them.  There also might be one heck of a feedback
own voice relayed back to them.  There also might be one heck of a feedback
problem.  Isolated microphones/speakers would solve the problem, but then you   might as well use a telephone.
might as well use a telephone.

Hope I'm correct with this assumption!

Ollie - N6LTJ