That's a good point to start with. I'll try to test that tomorrow if I can get someone to help me in this matters from our university partners.
I'll keep you and the list informed about the results and improvements. Thanx a lot. > If you are using 2 superceded mics and have 6 to 8 people talking and > they are not all directly in front of one or the other of these > microphones then indeed the levels will vary greatly. The pickup > pattern is typically designed to reject audio that is out side of > approximately 60 degrees. Some of the other reasons for your levels > fluctuating would include having PA adapt mode off as well as first mic > priority. With first mic priority off the two microphones you have will > fluctuate between the different sources or might even allow one talker > to gat them both on and cause phasing that will attenuate the signal > and affect its' tonality. PA adapt mode help the AEC to handle the echo > in your room, If it is disable the AEC may add suppression that will > attenuate the level you send to other nodes. This coupled with NLP off > and you will get either bursty echo or a loss of duplex with other > nodes. > > -----Original Message----- > From: Natalia Costas Lago [mailto:nata...@cesga.es] > Sent: Thursday, February 17, 2005 2:40 PM > To: tcof...@ncsa.uiuc.edu > Cc: nata...@cesga.es; paul.kuc...@manchester.ac.uk; > ag-t...@mcs.anl.gov; vg...@uvigo.es; r...@scom.uminho.pt; > Amân...@cesga.es; aman...@scom.uminho.pt; mquin...@uvigo.es; > ccar...@uvigo.es; gcas...@uvigo.es; nlo...@cesga.es; Tech Mailbox > Subject: Re: [AG-TECH] XAP setup - urgent > > > > mmm.... that doesnt seem to be an acceptable solution for us. > > What I have experienced in our meetings is that we can have up to 6-8 > people talking to 2 supercardioid microphones and each of them speak at > a different level. It is too hard (impossible) for a tech to try to > adjust the level each time any of them speak (sometimes some of them at > the same time :)))). > > I recall a sentence I read in one of those accessgrid papers... "for > the tech to vanish...". That's what we want, the less a tech has to > care about the better. I think the XAP should be able to do AGC > (automatic gain control) if it is set properly. We do not have problems > with noise level increase if there is a proper threshold set, maybe.. > do some other problems appear?. > > Personally, what I get out of my experience is that I rather prefer our > system after enabling the AGC than before. But I think our settings can > be improved, that's why I am cc'ing clearone tech staff, they are the > ones who can tell us what we can get out of the XAP. > > > >> >> We run into people with different speaking levels a lot during >> meetings here at ACCESS. The way we handle it is to try and identify a >> microphone for the soft spoken speaker and boost the fine gain >> control for it using gware. >> >> >> _______________________________________________ >> At 12:16 PM 2/17/2005, Natalia Costas Lago wrote: >>>"urn:schemas-microsoft-com:vml" xmlns:o = >>>"urn:schemas-microsoft-com:office:office" xmlns:w = >>>"urn:schemas-microsoft-com:office:word" xmlns:st1 = >>>"urn:schemas-microsoft-com:office:smarttags"> >>> >>>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: <mailto:paul.kuc...@manchester.ac.uk>Paul Kuchar >>>To: <mailto:nata...@cesga.es>'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: >>><mailto:paul.kuc...@manchester.ac.uk>paul.kuc...@manchester.ac.uk >>> >>> >>>---------- >>>From: owner-ag-t...@mcs.anl.gov [mailto:owner-ag-t...@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: <mailto:nata...@cesga.es>nata...@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/>http://www.cesga.es/ >> >> >> ___________________________________________________________ >> Tom Coffin .......................... tcof...@ncsa.uiuc.edu >> >> NCSA-ACCESS cel: 703-477-5948 >> 901 North Stuart Street, #800 tel: 703-248-0105 >> Arlington, Virginia 22203 fax: 703-248-0100 >> >> _________________________ http://www.ncsa.uiuc.edu/~tcoffin > > > > ----------------------------------- > Natalia Costas Lago > mailto: nata...@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/ ----------------------------------- Natalia Costas Lago mailto: nata...@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/
