[AG-TECH] RAT : "Monodirectional" sound ?

Thibault Daoulas thibault.daoulas at canterbury.ac.nz
Thu Mar 26 20:52:38 CDT 2009

Hi John,
I couldn't hear myself speaking, and did not check the audio card's 
loopback. I'm going to check all that you mentioned, thanks for your 
suggestions !
Oh and by the way yes, in the title I meant monodirectional, not 
monodimensional ;)


John I. Quebedeaux, Jr wrote:
> I can think of one instance, yes, when echo canceling is improperly setup -
> canceling oneself off or the other side off inadvertently.
> Long ago I remember this happening when someone's audio wasn't configured
> properly for echo canceling.
> Be sure that you are using only the audio coming from the remote site for
> echo canceling reference. This is usually referenced as the 'speaker' as in
> the audio that comes from your audio speakers - but that can be problematic
> if you're reinforcing your own audio into your own room - i.e. If you're
> hearing your own microphone in your speakers. Properly one should only
> cancel the remote audio (from the computer/rat specifically).
> One quick test, do you hear yourself when you speak even without any remote
> sites set to speak? Is the audio card's loopback muted? (on windows, that's
> the line in channel on the card is muted).
> The only other thing I can think of is an audio card is monodirectional... I
> forget the actual term.
> Perhaps there is something else, but those are off the top of my head... And
> perhaps they're not related... but I know to check these things!
> -John Q.

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