Subject: Re: [AUDITORY] A question about calibration of very high frequencies From: "Bernstein,Leslie" <lbernstein@xxxxxxxx> Date: Fri, 31 May 2019 13:59:13 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--_004_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_ Content-Type: multipart/alternative; boundary="_000_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_" --_000_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable True-- regardless of the source, however, if it shows up in the earphone me= asures, then it shows up in the ear canal. Again, we're working in the dar= k here. :-) On 5/31/2019 5:22 AM, Etienne Gaudrain wrote: Dear Sylvie, I also wondered what you meant by "exceptionally high"? Is that that in pre= vious measures you didn't have this noise? Or is it that it is high in abso= lute terms (what are the numbers then)? High frequency noise can come from fans, neon lights, screens... Although t= he latter two tend to have narrow spectra. Faulty preamp on our sound level= meter has also displayed HF noise in the past. -Etienne On Fri, 31 May 2019, 06:09 Bernstein,Leslie, <lbernstein@xxxxxxxx<mailto:lb= ernstein@xxxxxxxx>> wrote: Hello-- In order to help, much more information is required: Exactly what equipment is it that you wish to calibrate? What equipment are you using or do you have available to make the measures = of the desired signal and the associated noise floor? There are quite a few explanations for what you have found that can be narr= owed down based on the answers to the questions above. Given reasonable as= sumptions of linearity and availability of precision attenuators, it is oft= en not necessary at all to make such measures at low levels. Whether that'= s true in your case will depend upon the details. Les On 5/30/2019 12:18 AM, H?bert Sylvie wrote: 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?bert, Ph.D., Professor School of Speech pathology and audiology Pavillon 7077, Parc ave. - 3rd floor - room 3001-34 Faculty of medicine | Universit? de Montr?al [Universit? de Montr?al]<https://urldefense.proofpoint.com/v2/url?u=3Dhttp-= 3A__www.umontreal.ca_&d=3DDwMFAw&c=3DEZxp_D7cDnouwj5YEFHgXuSKoUq2zVQZ_7Fw9y= fotck&r=3D2Pw2GwelGcMR4953G-STHGpPJm2-pYYYSPmTwJk3sWM&m=3DOkvFOa7K4fB1QBWJH= QgEB73pmn6Idw1HPEAnKHorrwk&s=3DSzYSjQbUnlR95fFm1YA1M5QOfS2ztq9rwWYdOMngcBQ&= e=3D> Address : c.p. 6128, succ. Centre-ville, Montr?al, H3C 3J7 Tel: (514) 343-6111 #2594 www.eoa.umontreal.ca<https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__= www.eoa.umontreal.ca_&d=3DDwMFAw&c=3DEZxp_D7cDnouwj5YEFHgXuSKoUq2zVQZ_7Fw9y= fotck&r=3D2Pw2GwelGcMR4953G-STHGpPJm2-pYYYSPmTwJk3sWM&m=3DOkvFOa7K4fB1QBWJH= QgEB73pmn6Idw1HPEAnKHorrwk&s=3DjobSo3da4u4GsD0TrMWG7CiKqXl6nc4Tx6V0Vuy-J1g&= e=3D> Regular member International laboratory for Brain, Music, and Sound Research (BRAMS) Center for Research on Brain, Language, and Music -- Leslie R. Bernstein, Ph.D. | Professor Depts. of Neuroscience and Surgery (Otolaryngology)| UConn School of Medici= ne 263 Farmington Avenue, Farmington, CT 06030-3401 Office: 860.679.4622 | Fax: 860.679.2495 [cid:part5.BEEC4A1D.EB39E8C2@xxxxxxxx -- Leslie R. Bernstein, Ph.D. | Professor Depts. of Neuroscience and Surgery (Otolaryngology)| UConn School of Medici= ne 263 Farmington Avenue, Farmington, CT 06030-3401 Office: 860.679.4622 | Fax: 860.679.2495 [cid:part7.F1E231FA.E11C374A@xxxxxxxx --_000_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > </head> <body text=3D"#000000" bgcolor=3D"#FFFFFF"> <font size=3D"-1"><font face=3D"Verdana">True-- regardless of the source, h= owever, if it shows up in the earphone measures, then it shows up in the ea= r canal. Again, we're working in the dark here. <span class=3D"moz-smiley-s1"><span>:-)</span></span></font></font><br> <br> <div class=3D"moz-cite-prefix">On 5/31/2019 5:22 AM, Etienne Gaudrain wrote= :<br> </div> <blockquote type=3D"cite" cite=3D"mid:CAMf-+3bdK6RyN=3Dj7_Netn8oZ6V35z1= x8iebrQpX-92y3ZJiTZw@xxxxxxxx"> <div dir=3D"auto"> <div>Dear Sylvie,</div> <div dir=3D"auto"><br> </div> <div dir=3D"auto">I also wondered what you meant by "exceptionally hig= h"? Is that that in previous measures you didn't have this noise? Or i= s it that it is high in absolute terms (what are the numbers then)?</div> <div dir=3D"auto"><br> </div> <div dir=3D"auto">High frequency noise can come from fans, neon lights, scr= eens... Although the latter two tend to have narrow spectra. Faulty preamp = on our sound level meter has also displayed HF noise in the past.</div> <div dir=3D"auto"><br> </div> <div dir=3D"auto">-Etienne</div> <div dir=3D"auto"><br> <br> <div class=3D"gmail_quote" dir=3D"auto"> <div dir=3D"ltr" class=3D"gmail_attr">On Fri, 31 May 2019, 06:09 Bernstein,= Leslie, <<a href=3D"mailto:lbernstein@xxxxxxxx" moz-do-not-send=3D"true"= >lbernstein@xxxxxxxx</a>> wrote:<br> </div> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=0A= .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div text=3D"#000000" bgcolor=3D"#FFFFFF"><font size=3D"-1"><font face=3D"V= erdana">Hello--<br> <br> In order to help, much more information is required:<br> <br> Exactly what equipment is it that you wish to calibrate?<br> What equipment are you using or do you have available to make the measures = of the desired signal and the associated noise floor?<br> <br> There are quite a few explanations for what you have found that can be narr= owed down based on the answers to the questions above. Given reasonab= le assumptions of linearity and availability of precision attenuators, it i= s often not necessary at all to make such measures at low levels. Whether that's true in your case will d= epend upon the details.<br> <br> Les<br> </font></font><br> <br> <div class=3D"m_-8781448731275442526moz-cite-prefix">On 5/30/2019 12:18 AM,= Hébert Sylvie wrote:<br> </div> <blockquote type=3D"cite"> <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 sending low-intensity narrowband noises just above auditory threshold. = We have found that the baseline noise levels were exceptionally high for band frequencies 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?</p> <p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm;margin-left= :0cm"> </p> </div> <span id=3D"m_-8781448731275442526OLK_SRC_BODY_SECTION"> <div> <div link=3D"blue" vlink=3D"purple" lang=3D"EN-US"> <div class=3D"m_-8781448731275442526WordSection1"> <p class=3D"MsoNormal">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 Hébert, </span><= /b><b style=3D"font-size:11pt"><span style=3D"font-size:8pt;font-family:Ari= al,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:= Arial,sans-serif;color:rgb(35,48,145)">School of Speech pathology and audio= logy</span></b></p> <p class=3D"MsoNormal" style=3D"margin:0cm 0cm 3pt"><b><span style=3D"font-= size:7pt;font-family:Arial,sans-serif;color:rgb(127,127,127)">Pavillon 7077= , Parc ave. - 3rd floor - room 3001-34</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-size:= 9pt;font-family:Arial,sans-serif;color:rgb(35,48,145)"> | <b>Univ= ersité de Montréal</b></span></p> <table class=3D"m_-8781448731275442526MsoNormalTable" style=3D"color:rgb(0,= 0,0);font-family:Calibri;font-size:14px;border-collapse:collapse" cellspaci= ng=3D"0" cellpadding=3D"0" border=3D"0"> <tbody> <tr style=3D"height:19.7pt"> <td style=3D"width:70.9pt;padding:0cm=0A= 5.4pt;height:19.7pt" width=3D"95"> <p class=3D"MsoNormal" style=3D"margin-top:0cm;text-align:center" align=3D"= center"><a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__ww= w.umontreal.ca_&d=3DDwMFAw&c=3DEZxp_D7cDnouwj5YEFHgXuSKoUq2zVQZ_7Fw= 9yfotck&r=3D2Pw2GwelGcMR4953G-STHGpPJm2-pYYYSPmTwJk3sWM&m=3DOkvFOa7= K4fB1QBWJHQgEB73pmn6Idw1HPEAnKHorrwk&s=3DSzYSjQbUnlR95fFm1YA1M5QOfS2ztq= 9rwWYdOMngcBQ&e=3D" target=3D"_blank" rel=3D"noreferrer" moz-do-not-sen= d=3D"true"><span style=3D"color:rgb(31,73,125);text-decoration:none"><img i= d=3D"m_-8781448731275442526Image_x0020_5" src=3D"cid:part1.BA6F76FC.2829C84= D@xxxxxxxx" alt=3D"Université de Montréal" type=3D"image/png"= moz-do-not-send=3D"true" width=3D"79" height=3D"31" border=3D"0"></span></= a><span style=3D"font-size:10pt;font-family:Arial,sans-serif;color:rgb(31,7= 3,125)"></span></p> </td> <td style=3D"width:238.1pt;padding:0cm=0A= 5.4pt;height:19.7pt" width=3D"317" valign=3D"= top"> <p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm"><span styl= e=3D"margin-left:1px;margin-top:5px;width:295px;height:1px"><img src=3D"cid= :part3.38C987DF.E8C8B595@xxxxxxxx" type=3D"image/png" moz-do-not-send=3D"tr= ue" width=3D"295" height=3D"1"></span><b><span style=3D"font-size:5pt;font-= family:Arial,sans-serif;color:rgb(127,127,127)"></span></b></p> <p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm"><b><span s= tyle=3D"font-size:7pt;font-family:Arial,sans-serif;color:rgb(127,127,127)">= <br> </span></b></p> <p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm"><b><span s= tyle=3D"font-size:7pt;font-family:Arial,sans-serif;color:rgb(127,127,127)">= Address : c.p. 6128, succ. Centre-ville, Montréal, </span></b><= /p> <p class=3D"MsoNormal" style=3D"margin-top:0cm;margin-right:0cm"><b><span s= tyle=3D"font-size:7pt;font-family:Arial,sans-serif;color:rgb(127,127,127)">= H3C 3J7 </span></b><b style=3D"font-size:11pt"><span style=3D"font-siz= e: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"><b><span s= tyle=3D"font-size:6pt;font-family:Arial,sans-serif;color:gray"><a href=3D"h= ttps://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.eoa.umontreal.ca_&= amp;d=3DDwMFAw&c=3DEZxp_D7cDnouwj5YEFHgXuSKoUq2zVQZ_7Fw9yfotck&r=3D= 2Pw2GwelGcMR4953G-STHGpPJm2-pYYYSPmTwJk3sWM&m=3DOkvFOa7K4fB1QBWJHQgEB73= pmn6Idw1HPEAnKHorrwk&s=3DjobSo3da4u4GsD0TrMWG7CiKqXl6nc4Tx6V0Vuy-J1g&am= p;e=3D" target=3D"_blank" rel=3D"noreferrer" moz-do-not-send=3D"true"><span= style=3D"color:gray">www.eoa.umontreal.ca</span></a></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 face=3D"Arial,sans-serif" color=3D"#233091"><span style=3D"f= ont-size:8pt">R</span></font><font size=3D"2" face=3D"Arial,sans-serif" col= or=3D"#233091">e</font><font face=3D"Arial,sans-serif" color=3D"#233091"><s= pan 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 Research= (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> </blockquote> <br> <br> <div class=3D"m_-8781448731275442526moz-signature">-- <br> <b><span>Leslie R. Bernstein, Ph.D. </span></b><b><span>| </span></b><span>= Professor</span><span></span><span><br> Depts. of Neuroscience and Surgery (Otolaryngology)| UConn School of Medici= ne </span> <br> <span></span><span>263 Farmington Avenue, Farmington, CT 06030-3401</span><= br> <span></span><span>Office: 860.679.4622 | Fax: 860.679.2495<br> <br> <img alt=3D"" src=3D"cid:part5.BEEC4A1D.EB39E8C2@xxxxxxxx" moz-do-not-send= =3D"true" width=3D"125" height=3D"48"><br> </span></div> </div> </blockquote> </div> </div> </div> </blockquote> <br> <br> <div class=3D"moz-signature">-- <br> <title></title> <b><span style=3D"font-size:10.0pt;font-family:"Arial",sans-serif= ;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#002048"">Leslie R. Bernstein, Ph.D. </span></b><b><span style=3D"font-size:10.0pt;font-family:"Arial"= ,sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858"">| </span></b><span style=3D"font-size:10.0pt;font-family:"Arial",sa= ns-serif;mso-fareast-font-family:"Times=0A= New Roman \;color\:\#585858"">Professor</span><span style=3D"m= so-fareast-font-family: "Times New Roman""><o:p></o:p></span><spa= n style=3D"font-size:10.0pt;font-family:"Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""><br> Depts. of Neuroscience and Surgery (Otolaryngology)| UConn School of Medici= ne </span> <br> <span style=3D"font-size:10.0pt;font-family:"Arial",sans-serif;= =0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""></span><span style=3D"font-size:10.0pt;fon= t-family:"Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858"">263 Farmington Avenue, Farmington, CT 06030-3401</span><br> <span style=3D"font-size:10.0pt;font-family:"Arial",sans-serif;= =0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""></span><span style=3D"font-size:10.0pt;fon= t-family:"Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858"">Office: 860.679.4622 | Fax: 860.679.2495<br> <br> <img alt=3D"" src=3D"cid:part7.F1E231FA.E11C374A@xxxxxxxx" width=3D"125" he= ight=3D"48"><br> </span></div> </body> </html> --_000_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_-- --_004_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_ Content-Type: image/png; name="uconnhealth_stacked_blue_email.png" Content-Description: uconnhealth_stacked_blue_email.png Content-Disposition: inline; filename="uconnhealth_stacked_blue_email.png"; size=796; creation-date="Fri, 31 May 2019 13:59:13 GMT"; modification-date="Fri, 31 May 2019 13:59:13 GMT" Content-ID: <part7.F1E231FA.E11C374A@xxxxxxxx> Content-Transfer-Encoding: base64 iVBORw0KGgoAAAANSUhEUgAAAH0AAAAwCAMAAAALmIWlAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ bWFnZVJlYWR5ccllPAAAADNQTFRFKzVYHCZM4eLn8PHzpKi30dTbaG+IlZqrs7fDWWB8O0Nkd32U wsXPSlJwhoufDRhA////A68jmAAAABF0Uk5T/////////////////////wAlrZliAAACYklEQVR4 2uzY22KDIAwAUC7e6gjw/187gUC4OetaupflaTXKWSuBKNMuJptC+QMCP20auPHBQCubBWU46K24 uB7NfZ58ZqaMP8D8AEBHtT/goXnB8WPwBf8r1WYUXWxUOZobHcJXIMcfONclmE4s0lrRzYBIOjvT jX5WV6YbP2ZQJ6TWjfiAbuYzHW7p+xpuolQrP83sjQ5nupnu6LqaJ92MbnSznulcfkBHpNXNY6y+ c0JKnWX1eFeflQt5qcNESKnrQMrf6LSAXeiWkEoXdOU4nZBKxzPnoTohtW5ZZyK8W09Io6tYjyP1 iDS6XbAeh815S0irS6zHUfXuB0Ok1S3W41AdEWh1/Nb7UD1bWytd0LY4ThdnerYbBJ1taT5XBmy4 J8mNnWagp5fbba6HeiTdneK6vNgoFj0EhyO4eSZT6AlpdNXoNzqYi94GbIU0eqhHp3d5drRf4heZ Uo9Iq8vYptup6VB37H6m/W6m0hFpdaxH3/yK9cHpVq5Zy59n2GMV/QxPGdV9NElPE9njyOozsfWW Kq6j7bLuw97KPBnM/mX86//6n+tH/yLKP7AUXcyd80Lx53WnspB47ty5qKND1gLockfIFzHR7srp Q7X0+6GgHPNFXedPyaN1CPFli71z+ZBeTxbcI2RXxwOQj/lW/Ui610Z6gA4a32WRrssXYbO76V/Z y6FLnZVj/qCnqGcdZE1DeFKcntWrMV/RZXCh7B/fpF/+8tQQx6J74y9/Oeuyrm75+Jyf8oKWH9CL 1SYNJtJ91HTOAD2fdjPN9UcsumwmDNYXqvPtOLa9pH8LMACnoV0siZAyOAAAAABJRU5ErkJggg== --_004_04428976413d4d8c95fa3c0d22d5458aNSOITEXCMB21uchcnet_--