Fw: [AG-TECH] XAP setup

Tue Dec 28 05:35:19 CST 2004

The problem is solved setting the Non Linear Processing parameter to 
"Aggresive" in the AEC menu. I noticed the following effects:

- There is more echo than ever (it seemed like "Aggressive" was "Off" and 
viceverse). I can hardly appreciate any difference between "Soft" and 
"Medium" (there is still the full-duplex issue with those settings).

- There is complete full duplex.

I tested it and can repeat the procedure getting the same effect. So, the 
question is:

- Are the levels for NLP: "Off", "Soft", "Medium" and "Aggresive" inverted?

Any suggestions about how to ease the AEC process.. so i dont loose so much 
full duplex capabilities with soft or medium NLP level?

This is weird!!

Ah... I upgraded to 2.0.1 firmware lately, and I am using 5.0.2 version of 
Gware... The problem started prior to the upgrade.

Any help or new ideas are greatly appreciated.

Kind regards,
Natalia.

PS: I'll try to contact Clearone and keep you up to date with this funny 
thing.

-----------------------------------
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/

----- Original Message ----- 
From: "Natalia Costas Lago" <natalia at cesga.es>
To: "Natalia Costas Lago" <natalia at cesga.es>; <peirce at maine.edu>; "Robert 
Olson" <olson at mcs.anl.gov>
Cc: "ag-tech" <ag-tech at mcs.anl.gov>
Sent: Tuesday, December 28, 2004 11:16 AM
Subject: Re: Fw: [AG-TECH] XAP setup

>
> - NOM is deactivated.
> - Only one microphone unmuted.
>
> Each time I check "Enable Acoustic Echo Canceller (AEC)" or set Non Linear 
> Processing (NLP) to "Soft" (instead of "Off") I get this effect. Cant 
> speak on my node at the same time a PIG is playing an audio file.
>
> Mi question is, has someone done the same test? I cant really appreciate 
> the problem that much just with normal speech. It must be a continuous 
> sound (playing music por example). Maybe this is normal?
>
> ----- Original Message ----- 
> From: "Natalia Costas Lago" <natalia at cesga.es>
> To: <peirce at maine.edu>
> Cc: "ag-tech" <ag-tech at mcs.anl.gov>
> Sent: Tuesday, December 28, 2004 9:34 AM
> Subject: Re: Fw: [AG-TECH] XAP setup
>
>
>>
>> I've read about mics gain adjustment, but i am unsure about what is best 
>> about gain from "Rx from Codec" input (it is better to send the loudest 
>> level from PC audio, so I will have a strong signal on the XAP input? or 
>> that doesnt matter?)
>>
>> I'll think about NOM parameter, that is something i missed to think 
>> about.
>>
>> ----- Original Message ----- 
>> From: <peirce at maine.edu>
>> To: "Natalia Costas Lago" <natalia at cesga.es>
>> Sent: Monday, December 27, 2004 9:47 PM
>> Subject: Re: Fw: [AG-TECH] XAP setup
>>
>>
>>> Natalia,
>>> The XAPs (I use XAP800's in other projects) are capable of full
>>> duplex with AEC.
>>> You might start by checking what your AEC reference for the
>>> microphones is comprised of. It should be made up of the lines
>>> sources coming into the room (remote sites, locally reinforced line
>>> inputs like VCRs).  I'm wondering if you may have the microphones
>>> themselves included.
>>>
>>> You should also check your gain staging (using the meters) so that
>>> the levels are appropriate at every input and output stage.
>>>
>>> Might you have NOM enabled on the outputs to remote sites?
>>> This might be altering output levels as the number of mics changes.
>>>
>>> Have you tried contacting ClearOne support?
>>>
>>>
>>> On 27 Dec 2004 at 20:29, Natalia Costas Lago wrote:
>>>
>>>>
>>>> I think we have identified when the problem occurs,... when setting
>>>> the AEC or NLP (not neccesarily AEC selected) the full duplex
>>>> capabilities are lost (i play a sound with a PIG and talk at the same
>>>> time... my voice is completely atenuated!).
>>>>
>>>> Is this all I can get from the XAP?. There's no way to get _complete_
>>>> full duplex and AEC free?. Our users have noticed the effect (when
>>>> people talk at the same time one is atenuated).
>>>>
>>>> Any hint about this? Can any site have a test with us?
>>>>
>>>> ----- Original Message ----- 
>>>> From: "Natalia Costas Lago" <natalia at cesga.es>
>>>> To: <ag-tech at mcs.anl.gov>
>>>> Sent: Monday, December 27, 2004 7:32 PM
>>>> Subject: [AG-TECH] XAP setup
>>>>
>>>>
>>>> >
>>>> >
>>>> >
>>>> > Hi,
>>>> >
>>>> > I was wondering wether someone out there could help me to solve some
>>>> > issues regarding the XAP. It would be good if he/she had the VNC on
>>>> > the control PC, so i can have a look at the audio levels on the
>>>> > different stages. I think part of the current problem might be
>>>> > missconfigured audio levels (i know about theory in mics level.. but
>>>> > i am unsure about the input audio theory).
>>>> >
>>>> > We've been working hard on these issues and we are still having
>>>> > trouble. I would greatly appreciate some more help and patience from
>>>> > AG community...
>>>> >
>>>> > Kind regards and thanx in advance,
>>>> > Natalia.
>>>> >
>>>> >
>>>> > -----------------------------------
>>>> > Natalia Costas Lago
>>>> > mailto: natalia at cesga.es
>>>> >
>>>> > Centro de Supercomputacion de Galicia (CESGA)
>>>> > Avenida de Vigo, s/n Campus Sur
>>>> > 15705 Santiago de Compostela - SPAIN
>>>> > Tel: +34  981 56 98 10
>>>> > Fax: +34  981 59 46 16
>>>> > http://www.cesga.es/
>>>> >
>>>> >
>>>> >
>>>> >
>>>>
>>>
>>>
>>> Garry Peirce   peirce at maine.edu   1-207-581-3539
>>> ============================================
>>> ==                   Network Analyst
>>> ==     UNET Technology Services, Network Operations
>>> ==              University of Maine System
>>> ============================================
>>>
>>>
>>>
>>>
>>
>>
>
> 