<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.3562" name=GENERATOR></HEAD>
<BODY><!-- Converted from text/plain format -->
<H1><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: PT; mso-fareast-language: PT; mso-bidi-language: AR-SA"><IMG
height=360 src="cid:829451013@16072009-190F" width=300
v:shapes="_x0000_i1025"></SPAN></H1>
<H1>Bone Conduction Communication System ?</H1>
<P><FONT face=Verdana><STRONG>Bone Conduction</STRONG> (BC) could be used for
two-way communication systems in extremely noisy environments which require
hearing protection devices in the ear-canals.</FONT></P>
<P><FONT face=Verdana>A report on ScienceDaily says new technology to hear
vibrations through the skull bone has been developed at Chalmers University of
Technology. </FONT></P>
<P><FONT face=Verdana>Besides investigating the function of a new implantable
bone conduction hearing aid, Sabine Reinfeldt has studied the sensitivity for
bone conducted sound and also examined the possibilities for a two-way
communication system that is utilizing bone conduction in noisy
environments.</FONT></P>
<P><FONT face=Verdana>In two-way communication systems, Bone Conduction (BC) is
believed to improve the sound quality when used in extremely noisy environments
which require hearing protection devices in the ear-canals.</FONT></P>
<P><FONT face=Verdana>Several studies were performed to investigate the
possibilities for a BC communication system and to increase the general
knowledge of BC sound perception.</FONT></P>
<P><FONT face=Verdana>The low-frequency increase in perceived BC sound when
wearing ear-plugs and/or ear-muffs is called the occlusion effect. This effect
was studied by different methods and it was found that it is lower for deeper
insertion of ear-plugs and for larger ear-muffs, and that it varies for
different stimulations.</FONT></P>
<P><FONT face=Verdana>Read the full ScienceDaily article 'Better Than A Hearing
Aid? Better Hearing With Bone Conducted Sound' at<BR></FONT><A
href="http://www.sciencedaily.com/releases/2009/06/090622194227.htm"
target=_blank><FONT
face=Verdana>http://www.sciencedaily.com/releases/2009/06/<BR>090622194227.htm</FONT></A></P>
<P><FONT face=Verdana>Chalmers University of Technology press
release<BR></FONT><A
href="http://chalmersnyheter.chalmers.se/chalmers03/english/Article.jsp?article=13768"
target=_blank><FONT
face=Verdana>http://chalmersnyheter.chalmers.se/chalmers03/<BR>english/Article.jsp?article=13768</FONT></A></P>
<P><FONT face=Verdana>Army Research Laboratory (ARL) - Bone Conduction: Anatomy,
Physiology, and Communication<BR></FONT><A
href="http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=ADA468459&Location=U2&doc=GetTRDoc.pdf"
target=_blank><FONT
face=Verdana>http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=ADA468459<BR>&Location=U2&doc=GetTRDoc.pdf</FONT></A></P>
<P><FONT face=Verdana>Fonte: Science Daily</FONT></P></BODY></HTML>