Subject: Re: [AUDITORY] Microphones for HRTF measurement From: Florian Denk <florian.denk@xxxxxxxx> Date: Thu, 3 Jun 2021 10:30:14 +0200This is a multi-part message in MIME format. --------------5210FB6573E4D502FE63FF5C Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by edgeum4.it.mcgill.ca id 1538UID6095923 Dear Isaac, we have been using MEMS microphones a lot for such purposes,=20 specifically the Knowles SPH1642HT5H. This particular microphone has a=20 top-port configuration, which makes it convenient to solder. Generally,=20 MEMS microphones have good frequency response, distortion and noise=20 specs, which are by now (to my best knowledge) at least as good or=20 better than in electret condenser microphones (ECM) of comparable size.=20 One benefit of MEMS against ECM microphones that should be considered=20 specifically for measurements in the ear is their much lower variation=20 of sensitivity with temperature. Also, I would like to point out an anthropometric earplug for HRTF/HpTF=20 measurements that holds such a MEMS microphone in place, which Fabian=20 Brinkmann from TU Berlin and myself developed:=20 http://doi.org/10.5281/zenodo.2574395. It can simply be 3D printed from=20 the published stl files. Best, Florian Am 02.06.2021 um 11:55 schrieb Engel Alonso Martinez, Juan I: > > Dear all, > > I am looking to purchase some microphones for HRTF measurements,=20 > ideally with minimal noise and distortion, and a wide and flat=20 > frequency response. > > I have come across some email threads from 2009 in which they=20 > recommended the Sennheiser KE 4-211-2, but those were already=20 > discontinued back then. Does anyone have any more up-to-date=20 > suggestions, by any chance? > > Thank you, > > -- > > Isaac Engel > > PhD student > > Dyson School of Design Engineering > > Imperial College London > > https://www.imperial.ac.uk/people/isaac.engel=20 > <https://www.imperial.ac.uk/people/isaac.engel> > --=20 Dr. Florian Denk Deutsches H=C3=B6rger=C3=A4te Institut GmbH (German Institute of Hearing Aids) Ansch=C3=BCtzstra=C3=9Fe 1 23562 L=C3=BCbeck http://www.dhi-online.de Telefon: +49 (0) 451 305051 15 Fax: +49 (0) 451 305051 99 E-Mail: f.denk@xxxxxxxx Amtsgericht L=C3=BCbeck: HRB-Nr. 4500 Finanzamt L=C3=BCbeck: Steuer-Nr. 29112165 Ust-IdNr: DE197458095 Gesch=C3=A4ftsf=C3=BChrer: Dr. Hendrik Husstedt, Matthias Reichert --------------5210FB6573E4D502FE63FF5C Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by edgeum4.it.mcgill.ca id 1538UID6095923 <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF= -8"> </head> <body> <p>Dear Isaac,</p> <p>we have been using MEMS microphones a lot for such purposes, specifically the Knowles SPH1642HT5H. This particular microphone has a top-port configuration, which makes it convenient to solder. Generally, MEMS microphones have good frequency response, distortion and noise specs, which are by now (to my best knowledge) at least as good or better than in electret condenser microphones (ECM) of comparable size. One benefit of MEMS against ECM microphones that should be considered specifically for measurements in the ear is their much lower variation of sensitivity with temperature.<br> Also, I would like to point out an anthropometric earplug for HRTF/HpTF measurements that holds such a MEMS microphone in place, which Fabian Brinkmann from TU Berlin and myself developed: <a class=3D"moz-txt-link-freetext" href=3D"http://doi.org/10.5281/z= enodo.2574395">http://doi.org/10.5281/zenodo.2574395</a>. It can simply b= e 3D printed from the published stl files.<br> </p> <p>Best,<br> Florian</p> <pre class=3D"moz-signature" cols=3D"72"> </pre> <div class=3D"moz-cite-prefix">Am 02.06.2021 um 11:55 schrieb Engel Alonso Martinez, Juan I:<br> </div> <blockquote type=3D"cite" cite=3D"mid:PAXPR06MB8030820F90742494AA898641D33D9@xxxxxxxx= .prod.outlook.com"> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DU= TF-8"> <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"> <style>@xxxxxxxx {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;}@xxxxxxxx {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0cm; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-fareast-language:EN-US;}span.EmailStyle17 {mso-style-type:personal-compose; font-family:"Calibri",sans-serif; color:windowtext;}.MsoChpDefault {mso-style-type:export-only; font-family:"Calibri",sans-serif; mso-fareast-language:EN-US;}div.WordSection1 {page:WordSection1;}</style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> <div> <div class=3D"WordSection1"> <p class=3D"MsoNormal">Dear all,<o:p></o:p></p> <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p> <p class=3D"MsoNormal">I am looking to purchase some microphone= s for HRTF measurements, ideally with minimal noise and distortion, and a wide and flat frequency response.<o:p></o:p= ></p> <p class=3D"MsoNormal">I have come across some email threads from 2009 in which they recommended the Sennheiser KE 4-211-2, but those were already discontinued back then. Does anyone have any more up-to-date suggestions, by any chance?<o= :p></o:p></p> <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p> <p class=3D"MsoNormal">Thank you,<o:p></o:p></p> <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p> <p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-G= B">--<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-G= B">Isaac Engel<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-G= B">PhD student<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-G= B">Dyson School of Design Engineering<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-G= B">Imperial College London<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"mso-fareast-language:EN-G= B"><a href=3D"https://www.imperial.ac.uk/people/isaac.engel" moz-do-not-send=3D"true">https://www.imperial.ac.uk/peopl= e/isaac.engel</a><o:p></o:p></span></p> <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p> </div> </div> </blockquote> <p><br> </p> <pre class=3D"moz-signature" cols=3D"72">--=20 Dr. Florian Denk Deutsches H=C3=B6rger=C3=A4te Institut GmbH (German Institute of Hearing Aids) Ansch=C3=BCtzstra=C3=9Fe 1 23562 L=C3=BCbeck=20 <a class=3D"moz-txt-link-freetext" href=3D"http://www.dhi-online.de">http= ://www.dhi-online.de</a> Telefon: +49 (0) 451 305051 15 Fax: +49 (0) 451 305051 99 E-Mail: <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:f.denk@xxxxxxxx= nline.de">f.denk@xxxxxxxx</a> Amtsgericht L=C3=BCbeck: HRB-Nr. 4500 Finanzamt L=C3=BCbeck: Steuer-Nr. 29112165 Ust-IdNr: DE197458095 Gesch=C3=A4ftsf=C3=BChrer: Dr. Hendrik Husstedt, Matthias Reichert</pre> <pre class=3D"moz-signature" cols=3D"72"> </pre> </body> </html> --------------5210FB6573E4D502FE63FF5C--