Re: AUDITORY Digest - 2 Dec 2002 to 6 Dec 2002 (#2002-205) (Jont Allen )


Subject: Re: AUDITORY Digest - 2 Dec 2002 to 6 Dec 2002 (#2002-205)
From:    Jont Allen  <jba(at)auditorymodels.org>
Date:    Tue, 10 Dec 2002 09:55:58 -0500

Neil, I just heard a very nice talk on exactly this subject at the Cancun ASA meeting, by Doug Brungart Talk 2aPP7. With the use of double ear protectors (plugs plus muffs), the transmission level is reduced to the bone conduction level (at high frequencies), and the ability to localize goes away. Jont Automatic digest processor wrote: >There are 2 messages totalling 58 lines in this issue. > >Topics of the day: > > 1. Air to bone transmission characteristics (2) > >---------------------------------------------------------------------- > >Date: Fri, 6 Dec 2002 20:28:45 +0000 >From: Neil Todd <todd(at)FS4.PSY.MAN.AC.UK> >Subject: Air to bone transmission characteristics > >Dear List > >As some of you will know I have been interested in the physiology and >perception of loud sounds and music. I wonder if anyone could point me to >some literature in relation to the transmission of sound from air to bone. >I am particularly keen to find out what are the transfer characteristics of >the skull. I have read somewhere that the approximate difference in HL >between air and bone conducted hearing is about 40 dB. Thus with a naive >kind of calculation one might expect that with perfect ear plugs (or total >loss of the middle ear) that if you were standing in front of a loud rock >band playing at 120 dB SPL that you would perceive this to be about 80 dB. >Is this any where near the truth? > >Any help gratefully received. > >Neil Todd > >------------------------------ > >Date: Fri, 6 Dec 2002 16:08:15 -0500 >From: Mike Ravicz <mer(at)EPL.MEEI.HARVARD.EDU> >Subject: Re: Air to bone transmission characteristics > >>...transmission of sound from air to bone. >> > >Elliott Berger has done quite a bit of work on this recently, and Stefan >Stenfelt and we have looked it some as well. Our recent paper [J Acoust >Soc Am 109: 216-231 (2001)] includes several useful references, including >Berger's "Laboratory attenuation of earmuffs and earplugs both singly and >in combination" [Am Ind Hyg Assoc J 44: 312-329 (1983)], Schroeter and >Poesselt [J Acoust Soc Am 80: 505-527 (1986)], and Khanna et al. [J Acoust >Soc Am 60: 139-154 (1976)]. Berger had a paper Wed. at the ASA conference >[3aNS4, p. 2294] that I believe touches on these issues. You may find >Stenfelt's recent paper [J Acoust Soc Am 111: 947-959 (2002)] useful. The >military has been quite interested in sound transmission as well. > >>I have read somewhere that the approximate difference in HL >>between air and bone conducted hearing is about 40 dB. >>Is this any where near the truth? >> > >Pretty close - the difference is frequency dependent, and the minimum is >38-40 dB near 2 kHz. > >Mike Ravicz, Eaton-Peabody Lab., Mass. Eye & Ear Inf., Boston MA 02114 USA >+1 (617) 573-5591/3747; FAX +1 (617) 720-4408; mer(at)epl.meei.harvard.edu >"The ears are the vestibule of the soul." - Zippy > >------------------------------ > >End of AUDITORY Digest - 2 Dec 2002 to 6 Dec 2002 (#2002-205) >************************************************************* > -- Jont B. Allen, jba(at)auditorymodels.org; 908/654-1274voice; 908/789-9575 fax 382 Forest Hill Way Mountainside NJ 07092 http://auditorymodels.org/jba ``A paradox is simply an error out of control'' --E.T. Jaynes, Chapter 15 of http://bayes.wustl.edu/etj/prob/


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