[AG-TECH] Fw: Configuración Clearone - Santiago

[Natalia Costas Lago]

Hi Leslie,


How do u manage to compensate quiet and loud talkers in a room?. Maybe with 
the compressor feature?.
I send u a copy of our XAP settings (the report).
It seems that sound in our rooms is more stable with AGC enabled, some of 
our rooms are very noisy, we need about 10 dB of noise cancelation in order 
to get a clean audio signal. There probably is a problem when AGC works with 
a signal that suffered an big noise cancellation and echo cancellation 
process (noise cancellation is performed before automatic gain control... 
there might be a problem with this?).


  ----- Original Message ----- 
  From: Leslie Grant
  To: Natalia Costas Lago ; Paul Kuchar
  Cc: ag-tech ; Vicente Goyanes - UVIGO ; Raul Ferreira ; Amândio Antunes ; 
JM Rodriguez Quintas - UVIGO ; Celso Caride - UVIGO ; gcastro at uvigo.es ; 
Ignacio Lopez
  Sent: Thursday, February 17, 2005 6:34 PM
  Subject: RE: [AG-TECH] XAP setup - urgent


  I never use AGC as a way to compensate for loud and quiet talkers in a 
room. Keep in mind that if you are trying to pick up the quiet talked in the 
room from 20 feet away by using AGC you are going to also boost all the 
noise that accompanied that signal. The nose is a constant level while the 
talker audio will attenuate as it travels. What type of microphones are you 
using, where are they placed and how many do you have?



------------------------------------------------------------------------------
  From: Natalia Costas Lago [mailto:natalia at cesga.es]
  Sent: Thursday, February 17, 2005 10:16 AM
  To: Paul Kuchar
  Cc: ag-tech; Vicente Goyanes - UVIGO; Raul Ferreira; Amândio Antunes; JM 
Rodriguez Quintas - UVIGO; Celso Caride - UVIGO; gcastro at uvigo.es; Ignacio 
Lopez; Tech Mailbox
  Subject: Re: [AG-TECH] XAP setup - urgent



  Hi Paul,

  I think we do really need the AGC settings, the audio levels are 
uncontrolled without it. We avoid echo issues with them, maybe do you use 
the Compressor feature?.

  There is some trouble with people that speak louder or lower. I think 
there has to be a right way to set it...
  I am CC'ing clearone tech guys, maybe they have some advice?

  Kind regards,
  Natalia.

    ----- Original Message ----- 
    From: Paul Kuchar
    To: 'Natalia Costas Lago'
    Sent: Thursday, February 17, 2005 5:54 PM
    Subject: RE: [AG-TECH] XAP setup - urgent


    Dear Natalia,

    We advise AG nodes to use the default value of OFF for AGC/SL as trying 
to configure it causes all kinds of strange audio noises.



    This is also the advice from inSORS.



    AGC tries to control the gain and SL expands the sound of anything 
quiet.

    Unless you make any progress with the parameters, try switching AGC/SL 
off.



    Regards,

    Paul Kuchar, AGSC

    Collaborative Working Developments

    ===============================

    Manchester Computing, Kilburn Building

    University of Manchester, M13 9PL,

    United Kingdom

    ===============================

    Tel: +44(0)161-275 0668

    Fax: +44(0)161-275 6800 / 6040

    Email: Paul.Kuchar at manchester.ac.uk




----------------------------------------------------------------------------

    From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov] On 
Behalf Of Natalia Costas Lago
    Sent: 17 February 2005 16:25
    To: ag-tech
    Subject: [AG-TECH] XAP setup - urgent







    Dear all,





    We are quite in an emergency: our inauguration is about to happen (25th 
february). And we still have too many audio problems. I've followed some 
advices given here and given by te people from clearone and they helped us 
to understand the proceedings to configure the XAP settings. However there 
are some issues still. I hope someone out there with much experience in this 
equipment (and in audio systems) could help us:



    - We would like to know how to set the best AGC parameters (most 
importance) and Gating parameters. I think proper AGC settings would solve a 
big part of our problems.

    - The group the mics belong is set to none, I hope this involves only 
gating issues (we want to hear whatever speaker wanna say, so we are not 
interested in priority of one mic over another mic). May we have any 
problems derived from this point?





    Any help is greatly appreciated.



    Thanx a lot.

    Kind regards.



    Natalia.



    -----------------------------------
    Natalia Costas Lago
    email: natalia at cesga.es

    Centro de Supercomputacion de Galicia (CESGA)
    Avenida de Vigo, s/n Campus Sur
    15706 Santiago de Compostela - SPAIN
    Tel:   +34  981 56 98 10
    Fax:  +34  981 59 46 16
    http://www.cesga.es/
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