[AG-TECH] echo-cancellation on the cheap?

[Tom Coffin]

so - do you think it's viable? what is your conclusion?

_______________________________
On Fri, 8 Feb 2002, JSalva wrote:

    > FYI -
    > We took the initiative to bring in one of these GT1524 devices and prove
    > whether or not it is a viable alternative. Based on the specs - it should
    > plug and play - but here is what we found:
    > 
    > Follow this line swapping routine as you swap out the 400 with the 1524 -
    > AP 400 :	Output1		Output A 	Mic	Input A
    >     		     |		    |		  |	   |
    > GT1524 :	Line Out	Aux Out	Mic	Aux In
    > 
    > Initially we were able to receive audio on our node with the default GT1524
    > settings, but we were not getting anything transmitted to the other standard
    > node (which is using the AP400)
    > After a series of test and reset configurations...  on our node with the
    > GT1524, we adjusted Mic Gain Level to 10 & the Mic line input needed to be
    > set to 25db
    > 
    > Best Regards,
    > 
    > 
    > Jon Salva
    > 
    >  -----Original Message-----
    > From: 	owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]  On
    > Behalf Of JSalva
    > Sent:	Friday, February 01, 2002 12:04 PM
    > To:	David E. Bernholdt; ag-tech at mcs.anl.gov
    > Cc:	bernholdtde at ornl.gov
    > Subject:	RE: [AG-TECH] echo-cancellation on the cheap?
    > 
    >  << File: Gentner GT1524.pdf >> I just received this from our Gentner rep -
    > Spec sheet on the 1524 - this by definition should work just fine.
    > 
    > I am creating an offer to any non profit agency - if anyone needs one - I'll
    > pass through our cost of the device  = under $2k - hope this helps.
    > Best Regards,
    > 
    > 
    > Jon Salva
    > 
    > Best Regards,
    > 
    > 
    > Jon Salva
    > 
    >  -----Original Message-----
    > From: 	owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]  On
    > Behalf Of David E. Bernholdt
    > Sent:	Friday, February 01, 2002 11:08 AM
    > To:	ag-tech at mcs.anl.gov
    > Cc:	bernholdtde at ornl.gov
    > Subject:	Re: [AG-TECH] echo-cancellation on the cheap?
    > 
    > On Fri, 01 Feb 2002 10:11:27 -0600  JSalva wrote:
    > > On another note - if you are seeking to use a small node configuration for
    > a
    > > personal use within your facility - I know that Gentner has a single port
    > > cancellation device that supports the same logic as their 400 and 800
    > > devices - that should cost much less.
    > 
    > I followed this up with Jon & Darryl just now and to satisfy
    > everyone's curiousity, the unit is the GT1524, which lists for $2500
    > and includes a telephone interface.
    > 
    > In locating it on the web I also ran across the Gentner VTC AccuMic,
    > an echo cancelling mic listing for $550.  Undoubtedly one of many
    > examples which might work in a smaller room.
    > 
    > And finally, I've noted that some of the Polycom speakerphones seem to
    > have audio line out jacks.  But so far as I can tell, they seem to be
    > limited to the most expandable models, which are of course also the
    > most expensive (~$1500 if memory serves).  And I'm not sure it really
    > provides the capability you want -- I don't think you could play the
    > computer's sound over the Polycom speakers, and I don't know what
    > effect that might have on the echo cancellation capabilities.
    > 
    > --
    > David E. Bernholdt                   |   Email: bernholdtde at ornl.gov
    > Oak Ridge National Laboratory        |   Phone: +1 (865) 574 3147
    > http://www.csm.ornl.gov/~bernhold/   |   Fax:   +1 (865) 574 0680
    > 
    > 


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