[AG-TECH] audio levels and sound quality

Michael Daw michael.daw at manchester.ac.uk
Mon Feb 7 09:07:39 CST 2005


Plans are underway for such a reference site that will be usable by UK AG
nodes and (but don't tell anyone!) probably everyone else too. I don't have
a clear idea of how long this will be, but funding has been secured and work
is starting... No good to you now, Natalia, but maybe next time.

  _____  

From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov] On Behalf
Of Osland, CD (Chris)
Sent: 07 February 2005 14:24
To: Natalia Costas Lago; ag-tech
Subject: RE: [AG-TECH] audio levels and sound quality


I offered to set up a reference site which emitted a number of
audio test streams (white noise, pink noise cyclically looped, music,
speech, whale sounds (!)) some years back but the funding didn't
come through from the UK sources funding the rollout of AG
system at UK eScience centres.  And I'm not allowed to work on
something that isn't funded.
 
But it's still a really good idea, if someone else doesn't have my
funding restrictions.  Each source could come from the same
machine on a different stream, and users could use a particular
one by muting all but one of them at a time.
 
There could even be an extension where a software sound meter
on the reference machine showed the incoming level from a given
site - a software generated video stream.
 
Without such a reference, you just have to go through the
whole level-determining sequence that has been described before:
 
    in ClearOne:
       mic coarse gain
        mic fine gain
        mic channel output level
        output channel level
 
    in RAT:
        SEND level
 
    in computer:
        LINE input level
        LINE output level
 
    in RAT:
        RECEIVE level
 
    in ClearOne
        line input gain
        output channel leve
 
    on speaker (or amplifier if speakers are passive):
        gain
 
getting everything around the 0 dB / yellow area.
 
If you have a sound level meter, the level of speech
within the room used for testing should be around 70 dBA,
as should the level of speech being replayed through
the speakers.
 
Cheers
 
Chris
    

____________________________________________________________________ 
Chris Osland                                               Office tel: +44
(0) 1235 446565 
Digital Media and Access Grid                          Medialab tel: +44 (0)
1235 446459 
BIT Department                                     Access Grid room tel: +44
(0) 1235 445666 
e-mail:   C.D.Osland at rl.ac.uk                                       Fax: +44
(0) 1235 445597 
CCLRC Rutherford Appleton Laboratory (Bldg. R18) 
Chilton, DIDCOT, Oxon OX11 0QX, UK 
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-----Original Message-----
From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]On Behalf
Of Natalia Costas Lago
Sent: 07 February 2005 12:15
To: ag-tech
Subject: [AG-TECH] audio levels and sound quality


 
Hi everybody,
 
 
We are trying to set all the audio levels of our 6 AG nodes in a proper way.
I am looking for a way to check that all audio levels are the same (is there
any audio tool available?).
 
Any help about this matters would be greatly appreciated. We are having lots
of problems to get good audio.
 
Thanx in advance.
 
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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