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: [email protected] Fax: +44
(0) 1235 445597
CCLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK
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-----Original Message-----
From: [email protected] [mailto:[email protected]]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: [email protected]<mailto:[email protected]>
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/
