Hi Stephen!
We usually use wireless microphones from Sennheiser and AKG. These are
usually already in the room to amplify the lecturer.
If you really use a headset with a pocket transmitter you should have a
audio without echo and reverberation:
http://www.sennheiser.com/sennheiser/home_en.nsf/root/professional_wireless-microphone-systems_headsets_ew-300-g3_021203
But these systems are quite expansive compared to blutooth headsets. But
the bluetooth devices are mostly very limited in quality as they are
designed for telephones that only use a small spectrum.
From our experience I must confess that most lecturer don't like
headsets at all. They just want something that they hang around their
neck and that they can forget about. So we mostly attach the microphones
directly to the pocket transmitter and put a stripe on it so that they
hang it around the neck. But the quality especially for the speech
recognition will not be as good as the professional headset microphones.
Rüdiger
Stephen Marquard wrote:
Hi all,
I was wondering what microphones people are planning to use?
Some early experiments I have been doing with CMU Sphinx show that the
speech recognition engine is very sensitive to echo and reverberation
(as well as background noise), so we are looking at lapel mics and
head-mounted mics.
For venues where amplification isn't necessary for the audience, I was
also wondering whether bluetooth headsets would be an option?
Regards
Stephen
--
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Rüdiger Rolf, M.A.
Universität Osnabrück - Zentrum virtUOS
Heger-Tor-Wall 12, 49069 Osnabrück
Telefon: (0541) 969-6511 - Fax: (0541) 969-16511
E-Mail: [email protected]
Internet: www.virtuos.uni-osnabrueck.de
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