Re: Individualized HRTF measurements (Elena Grassi )

Subject: Re: Individualized HRTF measurements From: Elena Grassi <elena.grassi@xxxxxxxx> Date: Mon, 7 Mar 2016 09:48:54 -0600 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY> --001a11431a64e444df052d776652 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Thibaud, years ago i carried out HRTF's measurements using microphones Knowles FG3329 and I have used other similar microphones by the same company. You can find a description of the procedure in http://www.isr.umd.edu/Labs/NSL/Files/grassi_ICAD2003.pdf The microphones were surrounded by a layer of swimming ear plug silicon and then embedded into silicon moulding material (normally used for making ear impressions for hearing aids). The compound hardens within minutes, conforming to the shape of the ear canal and sealing it. For hygiene purposes, the ear molding impression material was changed for each subject (also to have a better seal of the earcanal). The microphone itself never came into contact with the ear canal, and we cleaned the wires with alcohol. Hope this helps, good luck with your measurements. -elena On Fri, Mar 4, 2016 at 2:52 AM, Thibaud <thibaud.leclere@xxxxxxxx> wrote: > Dear List, > > > > I intend to carry out some individualized HRTF measurements. I thought > some device would exist in purpose of such measurement by including tiny > microphones and a system to maintain their position into the ear canal bu= t > I feel more like each team uses its =E2=80=9Chomemade=E2=80=9D setup=E2= =80=A6 I only saw a > =E2=80=9Cbinaural microphone=E2=80=9D designed by Bruel and Kjaer which i= s very expensive. > > > > I was then wondering what microphone do you use/propose/advice for > individualized HRTF measurements ? Do you also know a way to hold the > microphone in position during the measurement procedure ? And finally, do > you use any type of protection in between the microphone and the ear cana= l > in order to avoid a direct contact and then get the measurement more > hygienic (given that the microphones will inserted in several subjects=E2= =80=99 ear > canals=E2=80=A6) ? > > > > Any help or advice on these matters would be very appreciated. > > Thank you very much by advance, > > > > *Thibaud LECLERE* > > > -------------------------------------------------------------------------= ---------------- > > PostDoc Researcher > > Universit=C3=A9 de Lyon - =C3=89cole Nationale des Travaux Publics de l'= =C3=89tat (ENTPE) > > Laboratoire G=C3=A9nie Civil et B=C3=A2timent (LGCB) > > Rue Maurice Audin - 69518 Vaulx-en-Velin - France > > Office B022 > > Tel : (+33)4.72.04.70.36 > > > --001a11431a64e444df052d776652 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Hi Thibaud, years ago i carried out HRTF's measurement= s using microphones Knowles FG3329 and I have used other similar microphone= s by the same company. You can find a description of the procedure in=C2=A0= <a href=3D"http://www.isr.umd.edu/Labs/NSL/Files/grassi_ICAD2003.pdf">http:= //www.isr.umd.edu/Labs/NSL/Files/grassi_ICAD2003.pdf</a><div><div>The micro= phones were surrounded by a layer of swimming ear plug silicon and then emb= edded into silicon moulding material (normally used for making ear impressi= ons for hearing aids). The compound hardens within minutes, conforming to t= he shape of the ear canal and sealing it.</div><div>For hygiene purposes, t= he ear molding impression material was changed for each subject (also to ha= ve a better seal of the earcanal). The microphone itself never came into co= ntact with the ear canal, and we cleaned the wires with alcohol. </div><= /div><div>Hope this helps, good luck with your measurements.</div><div>-ele= na</div></div><div class=3D"gmail_extra"> <div class=3D"gmail_quote">On = Fri, Mar 4, 2016 at 2:52 AM, Thibaud <<a href=3D"mailt= o:thibaud.leclere@xxxxxxxx" target=3D"_blank">thibaud.leclere@xxxxxxxx<= /a>> wrote: <blockquote class=3D"gmail_quote" style=3D"margin:= 0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Dear List, =C2=A0 I intend to carry out some individualized HRTF= measurements. I thought some device would exist in purpose of such measure= ment by including tiny microphones and a system to maintain their position = into the ear canal but I feel more like each team uses its =E2=80=9Chomemad= e=E2=80=9D setup=E2=80=A6 I only saw a =E2=80=9Cbinaural microphone=E2=80= =9D designed by Bruel and Kjaer which is very expensive. =C2=A0 I was then wondering what microphone do you us= e/propose/advice =C2=A0for individualized HRTF measurements ? Do you also k= now a way to hold the microphone in position during the measurement procedu= re ? And finally, do you use any type of protection in between the micropho= ne and the ear canal in order to avoid a direct contact and then get the me= asurement more hygienic (given that the microphones will inserted in severa= l subjects=E2=80=99 ear canals=E2=80=A6) ? =C2=A0 Any help or advice on these matters would be v= ery appreciated. Thank you very much by advance, =C2=A0 Thibaud LECLERE ----------------------------------------------= ------------------------------------------- PostDoc Researcher Universit=C3=A9 de Lyon - =C3=89cole Nationale= des Travaux Publics de l'=C3=89tat (ENTPE) Laboratoire G=C3=A9nie Civil et B=C3=A2timent = (LGCB) Rue Maurice Audin - 69518 Vaulx-en-Velin - Fra= nce Office B022 Tel=C2=A0: <a href=3D"tel:%28%2B33%294.72.04.7= 0.36" value=3D"+33472047036" target=3D"_blank">(+33)4.72.04.70.36</a></span= > =C2=A0</blockquote></div> </div> --001a11431a64e444df052d776652--

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