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

[Jon Salva]

Hi Tom,
To embellish on my previous email -
The device successfully integrated - but with the minor modifications.
The quality was not impaired & it worked great. The nice thing is that it is
of the same manufacture.
A drawback that I did not mention, because I didn't think it was necessary,
is the 'only configuration interface at this time is the front panel'. This
may too play factor for some.

My opinion - relative to those who 'must use an alternative' due to a cost
constraint = certainly viable.

My opinion - relative to others = I do not recommend limiting one's options.

Hope this helps...

Jon Salva
Imprint Systems
630-505-1700
(Outside IL)800-433-4512
jsalva at imprintsys.com



----- Original Message -----
From: "Tom Coffin" <tcoffin at ncsa.uiuc.edu>
To: "JSalva" <agtech at imprintsys.com>
Cc: <ag-tech at mcs.anl.gov>
Sent: Saturday, February 09, 2002 8:11 AM
Subject: RE: [AG-TECH] echo-cancellation on the cheap?


>
> 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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