Ivan R. Judson judson at mcs.anl.gov
Mon Dec 17 07:35:12 CST 2001

I think the goal of an audio configuration document needs to be high-enough
level to capture the "intent" but not the "implementation".

This would make the document clear enough to be a recipe for configuring
audio with different equipment.



> -----Original Message-----
> From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]On
> Behalf Of Mustafa Varank
> Sent: Monday, December 17, 2001 7:11 AM
> To: Allan Spale
> Cc: ag-tech at mcs.anl.gov
> Subject: Re: [AG-TECH] XAP 800
> Allan,
> Thank you for the advices but XAP 800 does look different. There are
> processors ( no sub?) on XAP800 and you should set "EC Reference and PA"
> differently. Even i tried to set it, it did not work...I am doing
> something
> wrong but i could not find...
> Could you please tell me also where did you put speakers on your sample
> matrix picture?
> I will be waiting to see the updated web site...
> Thanks,
> Mustafa
> At 03:26 PM 12/16/2001 -0600, you wrote:
> >Mustafa,
> >
> >I have been working on creating a more up-to-date Gentner configuration
> >document, so I will attach an image from the document that will
> eventually
> >appear in the AGDP.
> >
> >I am not sure how ifferent the XAP 800 is from an AP 400, but I would
> >imagine that the echo cancellation should be similar.
> >
> >In the matrix, notice that Output D is labeled "Ghost Output".  This
> >output, which should have nothing connected to it physically,
> will be used
> >in echo cancellation.  This is demonstrated by looking at the bottom of
> >the image where you will select which output to serve as echo
> >cancellation.
> >
> >You want to echo cancel anything that would come out of your speakers so
> >that the Gentner does not think that this is regular audio going into the
> >mics (or something like that...I am not a complete expert on this audio
> >stuff).  Specifically, this would be sound from your telco and audio from
> >the AG.  The AG sound should be entering an input, and the sound from the
> >telco should be "Telco in".
> >
> >Create a crosspoint on the "Ghost Output" and the AG audio in
> row (RX from
> >AG) and the "Telco In" row.
> >
> >In the "Echo Cancellation Setup", select the output channel that
> >corresponds to the output designated as the "Ghost Output".  Please note
> >that the scenario described above is for the net-telco preset (preset 1).
> >For preset 2 (concerning the "Ghost Output" only and not the other mics,
> >inputs, outputs, an stuff), only have the telco crosspoint set in the
> >"Ghost Ouput" column.  For preset 3, only have the RX from AG
> (or whatever
> >you named that input that receives audio from the AG) crosspoint set in
> >the "Ghost Output" column.
> >
> >Also as far as general guidelines, make sure that your gain is
> not set too
> >high on the mics or this will cause echo.  Aditionally, make sure that
> >your mics are not too close to the speakers or else you may have echo
> >problems.
> >
> >Best of luck in figuring this problem out.
> >
> >
> >Allan
> >EVL at UIC
> >node-op
> >
> >
> >On Sun, 16 Dec 2001, Mustafa Varank wrote:
> >
> > > Hello,
> > > Can anybody send me some suggestions about how to set echo
> cancellation on
> > > XAP 800? I am having hard time to figure it out. And if you
> can send it
> > > today or  early monday morning that would be great...
> > > Thanks
> > >

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