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Date:      Fri, 17 May 1996 01:21:40 -0700
From:      "Amancio Hasty Jr." <hasty@rah.star-gate.com>
To:        "Christoph P. Kukulies" <kuku@gilberto.physik.rwth-aachen.de>
Cc:        multimedia@freebsd.org
Subject:   Re: full duplex observations 
Message-ID:  <199605170821.BAA02406@rah.star-gate.com>
In-Reply-To: Your message of "Fri, 17 May 1996 09:21:10 %2B0200." <199605170721.JAA12644@gilberto.physik.rwth-aachen.de> 

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> 
> Now after doing some testing with a colleague I found out that the
> nasty echo effect doesn't stem from the GUS wiring mic to local speakers.
> 
> It's simple. You hear your own voice delayed by the packet travel
> time fed back to your opponents mic.
> 
> When he switched off his speakers the echo was gone. So either you use
> a head set on both sides or you refrain from using full duplex.

If you switch the <full duplex> option on vat, it has the interesting
effect of not performing echo cancellation. I believe that the
sgi version of vat or at least the one that I have used in the past
has full duplex enabled by default so switch it off.


	Enjoy,
	Amancio






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