Subject: [AUDITORY] A question about calibration of very high frequencies From: =?iso-8859-1?Q?H=E9bert_Sylvie?= <sylvie.hebert@xxxxxxxx> Date: Wed, 29 May 2019 20:29:26 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--_005_D91464ED25F7Fsylviehebertumontrealca_ Content-Type: multipart/alternative; boundary="_000_D91464ED25F7Fsylviehebertumontrealca_" --_000_D91464ED25F7Fsylviehebertumontrealca_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear List, We would like to calibrate our equipment to verify that it is capable to se= nding low-intensity narrowband noises just above auditory threshold. We hav= e found that the baseline noise levels were exceptionally high for band fre= quencies above 8kHz. Can anyone explain why this may be the case? Does anyo= ne have any suggestions for how to approach measuring very low-intensity so= unds? Thanks, Sylvie H=E9bert, Ph.D., Professor School of Speech pathology and audiology Pavillon 7077, Parc ave. - 3rd floor - room 3001-34 Faculty of medicine | Universit=E9 de Montr=E9al [Universit=E9 de Montr=E9al]<http://www.umontreal.ca/> Address : c.p. 6128, succ. Centre-ville, Montr=E9al, H3C 3J7 Tel: (514) 343-6111 #2594 www.eoa.umontreal.ca<http://www.eoa.umontreal.ca/> Regular member International laboratory for Brain, Music, and Sound Research (BRAMS) Center for Research on Brain, Language, and Music --_000_D91464ED25F7Fsylviehebertumontrealca_ Content-Type: text/html; charset="iso-8859-1" Content-ID: <9F16B75DD328544188461AA163CFBE85@xxxxxxxx> Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-= 1"> </head> <body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin= e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami= ly: Calibri, sans-serif;"> <div> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> Dear List,</p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <br> </p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> We would like to calibrate our equipment to verify that it is capable to se= nding low-intensity narrowband noises just above auditory threshold. We hav= e found that the baseline noise levels were exceptionally high for band fre= quencies above 8kHz. Can anyone explain why this may be the case? Does anyone have any suggestions for how= to approach measuring very low-intensity sounds?<o:p></o:p></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <o:p> </o:p></p> </div> <span id=3D"OLK_SRC_BODY_SECTION"> <div xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micro= soft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" x= mlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:/= /www.w3.org/TR/REC-html40"> <div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"> <div class=3D"WordSection1"> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a= lt:auto"><o:p></o:p></p> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a= lt:auto">Thanks,</p> </div> </div> </div> </span> <div><br> </div> <div> <div> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b style=3D"font-size: 11pt;"><span style=3D"font-size: 10pt; font-family: = Arial, sans-serif; color: rgb(35, 48, 145);">Sylvie H=E9bert, </span><= /b><b style=3D"font-size: 11pt;"><span style=3D"font-size: 8pt; font-family= : Arial, sans-serif; color: rgb(35, 48, 145);">Ph.D., Professor</span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b style=3D"font-size: 11pt;"><span style=3D"font-size: 8pt; font-family: A= rial, sans-serif; color: rgb(35, 48, 145);">School of Speech pathology and = audiology</span></b></p> <p class=3D"MsoNormal" style=3D"margin: 0cm 0cm 3pt;"><b><span style=3D"fon= t-size: 7pt; font-family: Arial, sans-serif; color: rgb(127, 127, 127);">Pa= villon 7077, Parc ave. - 3rd floor - room 3001-34<o= :p></o:p></span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b><span style=3D"font-size: 9pt; font-family: Arial, sans-serif; color: rg= b(35, 48, 145);">Faculty of medicine </span></b><span style=3D"font-si= ze: 9pt; font-family: Arial, sans-serif; color: rgb(35, 48, 145);"> |&= nbsp;<b>Universit=E9 de Montr=E9al</b></span></p> <table class=3D"MsoNormalTable" border=3D"0" cellspacing=3D"0" cellpadding= =3D"0" style=3D"color: rgb(0, 0, 0); font-family: Calibri; font-size: 14px;= margin-left: -7.1pt; border-collapse: collapse;"> <tbody> <tr style=3D"height: 19.7pt;"> <td width=3D"95" style=3D"width: 70.9pt; padding: 0cm 5.4pt; height: 19.7pt= ;"> <p class=3D"MsoNormal" align=3D"center" style=3D"margin-top: 0cm; margin-ri= ght: -5.4pt; margin-left: -5.4pt; text-align: center;"> <a href=3D"http://www.umontreal.ca/"><span style=3D"color: rgb(31, 73, 125)= ; text-decoration: none;"><img border=3D"0" width=3D"79" height=3D"31" id= =3D"Image_x0020_5" src=3D"cid:00D01C46-46E9-499A-91F7-A71728209CCF" alt=3D"= Universit=E9 de Montr=E9al" type=3D"image/png"></span></a><span style=3D"fo= nt-size: 10pt; font-family: Arial, sans-serif; color: rgb(31, 73, 125);"><o= :p></o:p></span></p> </td> <td width=3D"317" valign=3D"top" style=3D"width: 238.1pt; padding: 0cm 5.4p= t; height: 19.7pt;"> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: -5.4pt;"> <span style=3D"position: absolute; z-index: 251671552; left: 0px; margin-le= ft: 1px; margin-top: 5px; width: 295px; height: 1px;"><img width=3D"295" he= ight=3D"1" src=3D"cid:4BA072F5-E1B7-419E-93EB-41418849E974" v:shapes=3D"Ima= ge_x0020_6" type=3D"image/png"></span><b><span style=3D"font-size: 5pt; fon= t-family: Arial, sans-serif; color: rgb(127, 127, 127);"><o:p></o:p></span>= </b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: -5.4pt;"> <b><span style=3D"font-size: 7pt; font-family: Arial, sans-serif; color: rg= b(127, 127, 127);"><br> </span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: -5.4pt;"> <b><span style=3D"font-size: 7pt; font-family: Arial, sans-serif; color: rg= b(127, 127, 127);">Address : c.p. 6128, succ. Centre-ville, Montr=E9al,&nbs= p;</span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: -5.4pt;"> <b><span style=3D"font-size: 7pt; font-family: Arial, sans-serif; color: rg= b(127, 127, 127);">H3C 3J7 </span></b><b style=3D"font-size: 11pt;"><s= pan style=3D"font-size: 7pt; font-family: Arial, sans-serif; color: rgb(127= , 127, 127);">Tel: (514) 343-6111 #2594</span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: -1.2pt;"> <b><span style=3D"font-size: 6pt; font-family: Arial, sans-serif; color: gr= ay;"><a href=3D"http://www.eoa.umontreal.ca/"><span style=3D"color: gray;">= www.eoa.umontreal.ca</span></a><o:p></o:p></span></b></p> </td> </tr> </tbody> </table> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b><span style=3D"font-size: 10pt; font-family: Arial, sans-serif;"> <= /span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b><span style=3D"font-size: 9pt; font-family: Arial, sans-serif; color: rg= b(35, 48, 145);"> </span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b><font color=3D"#233091" face=3D"Arial,sans-serif"><span style=3D"font-si= ze: 8pt;">R</span></font><font color=3D"#233091" face=3D"Arial,sans-serif" = size=3D"2">e</font><font color=3D"#233091" face=3D"Arial,sans-serif"><span = style=3D"font-size: 8pt;">gular member</span></font></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b><span style=3D"font-size: 8pt; font-family: Arial, sans-serif; color: rg= b(35, 48, 145);">International laboratory for Brain, Music, and Sound Resea= rch (BRAMS)</span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm; margin-= left: 0cm;"> <b><span style=3D"font-size: 8pt; font-family: Arial, sans-serif; color: rg= b(35, 48, 145);">Center for Research on Brain, Language, and Music</span></= b></p> </div> </div> <style><!-- /* Font Definitions */ @xxxxxxxx {font-family:"Cambria Math"; 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