 July
Meeting Notice
July
2004 Meeting Notice
| Subject: | Test methods and safety of communications
headsets | | Speakers: | Osman Isvan, Allen Woo | | Place: | Plantronics,
345 Encinal Street, Santa Cruz, CA 95060 | | Time and Date: | July
27th, 7:30 PM (refreshments at 7:00 PM) |
This presentation is an introduction to special techniques for measuring
acoustic parameters of headphones and headset microphones. The focus will be on
the types of ear simulators and their proper use. The choice of an
appropriate ear simulator is critical because the presence of the user's ear
alters the sound field of the headphone and the presence of the headphone alters
the Head Related Transfer Function. Conversions between free field and diffuse
field sound pressure and sound pressure referred to common reference points such
as ear Drum Reference Point (DRP) and Ear ReferencePoint (ERP) will be
discussed.
Inappropriate use of headsets can lead to hearing damage from excessive acoustic
exposure. Two elements contribute to assuring acoustic safety: Oneis to
determine the maximum safe acoustic output; the second is to design atest method
for measuring the maximum acoustic output of a headset. These elements are
governed by various national and international standards. The latest activities
of these organizations will be presented.
Osman Isvan has worked in the audio industry for 20 years. His focus is the
translation between sound fields and audio signals. For the last 4 years he has
been an acoustics engineer designing wired and wireless communications headsets
at Plantronics. Prior to that, he worked in R&D teams at Bose Corporation
and Gibson Guitar, specializing on transducer design and sound system
optimization. He holds a Master of Science degree in Mechanical Engineering from
Tufts University. He has 3 patents issued and several patents pending.
Allen Woo started his audio and acoustics career in the late '80s. He holds a
Master of Science degree in Mechanical Engineering from university of Utah. He
co-developed the first noise exposure measurement system for headset
applications for OSHA in 1989. Allen started as an acoustic design
engineer at Plantronics in 1990 and was promoted to principal engineer in 2001.
Currently, he is an active member of various industry standard
committees, including IEEE, ITU-T, TIA, ETSI, ANSI, ISO, IEC. His area of
interests are acoustic measurement and safety of telecommunication terminals.
Directions
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