Re: [AUDITORY] A question about calibration of very high frequencies ("Bernstein,Leslie" )


Subject: Re: [AUDITORY] A question about calibration of very high frequencies
From:    "Bernstein,Leslie"  <lbernstein@xxxxxxxx>
Date:    Thu, 30 May 2019 13:35:05 +0000
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

--_006_1ffcf2e0cd044070b5bd207f9e158e18NSOITEXCMB21uchcnet_ Content-Type: multipart/alternative; boundary="_000_1ffcf2e0cd044070b5bd207f9e158e18NSOITEXCMB21uchcnet_" --_000_1ffcf2e0cd044070b5bd207f9e158e18NSOITEXCMB21uchcnet_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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=E9bert 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=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]<https://urldefense.proofpoint.com/v2/url?u=3Dh= ttp-3A__www.umontreal.ca_&d=3DDwMFAw&c=3DEZxp_D7cDnouwj5YEFHgXuSKoUq2zVQZ_7= Fw9yfotck&r=3D2Pw2GwelGcMR4953G-STHGpPJm2-pYYYSPmTwJk3sWM&m=3DOkvFOa7K4fB1Q= BWJHQgEB73pmn6Idw1HPEAnKHorrwk&s=3DSzYSjQbUnlR95fFm1YA1M5QOfS2ztq9rwWYdOMng= cBQ&e=3D> Address : c.p. 6128, succ. Centre-ville, Montr=E9al, 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 --_000_1ffcf2e0cd044070b5bd207f9e158e18NSOITEXCMB21uchcnet_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-= 1"> </head> <body text=3D"#000000" bgcolor=3D"#FFFFFF"> <font size=3D"-1"><font face=3D"Verdana">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.&nbsp; 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.&nbsp; Whether that's true in your case will d= epend upon the details.<br> <br> Les<br> </font></font><br> <br> <div class=3D"moz-cite-prefix">On 5/30/2019 12:18 AM, H=E9bert Sylvie wrote= :<br> </div> <blockquote type=3D"cite" cite=3D"mid:D91464ED.25F7F%25sylvie.hebert@xxxxxxxx= eal.ca"> <div> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm;=0A= margin-left: 0cm;"> Dear List,</p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm;=0A= margin-left: 0cm;"> <br> </p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right: 0cm;=0A= 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;=0A= margin-left: 0cm;"> <o:p>&nbsp;</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 link=3D"blue" vlink=3D"purple" lang=3D"EN-US"> <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:=0A= 0cm; margin-left: 0cm;"> <b style=3D"font-size: 11pt;"><span style=3D"font-size: 10pt;=0A= font-family: Arial, sans-serif; color: rgb(35, 48,=0A= 145);">Sylvie H=E9bert,&nbsp;</span></b><b style=3D"font-si= ze:=0A= 11pt;"><span style=3D"font-size: 8pt; font-family: Arial,=0A= sans-serif; color: rgb(35, 48, 145);">Ph.D., Professor</span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right:=0A= 0cm; margin-left: 0cm;"> <b style=3D"font-size: 11pt;"><span style=3D"font-size: 8pt;=0A= font-family: Arial, sans-serif; color: rgb(35, 48,=0A= 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;=0A= color: rgb(127, 127, 127);">Pavillon 7077, Parc ave. - &nbs= p;3rd floor&nbsp; -&nbsp;&nbsp; room 3001-34<o:p></o:p></span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm; margin-right:=0A= 0cm; margin-left: 0cm;"> <b><span style=3D"font-size: 9pt; font-family: Arial,=0A= sans-serif; color: rgb(35, 48, 145);">Faculty of medicine&n= bsp;</span></b><span style=3D"font-size: 9pt;=0A= font-family: Arial, sans-serif; color: rgb(35, 48, 145);">&nb= sp;|&nbsp;<b>Universit=E9 de Montr=E9al</b></span></p> <table class=3D"MsoNormalTable" style=3D"color: rgb(0, 0, 0);=0A= font-family: Calibri; font-size: 14px; margin-left: -7.1pt;=0A= border-collapse: collapse;" cellspacing=3D"0" cellpadding=3D"0"= border=3D"0"> <tbody> <tr style=3D"height: 19.7pt;"> <td style=3D"width: 70.9pt; padding: 0cm 5.4pt; height:=0A= 19.7pt;" width=3D"95"> <p class=3D"MsoNormal" style=3D"margin-top: 0cm;=0A= margin-right: -5.4pt; margin-left: -5.4pt;=0A= text-align: center;" align=3D"center"> <a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.umontr= eal.ca_&amp;d=3DDwMFAw&amp;c=3DEZxp_D7cDnouwj5YEFHgXuSKoUq2zVQZ_7Fw9yfotck&= amp;r=3D2Pw2GwelGcMR4953G-STHGpPJm2-pYYYSPmTwJk3sWM&amp;m=3DOkvFOa7K4fB1QBW= JHQgEB73pmn6Idw1HPEAnKHorrwk&amp;s=3DSzYSjQbUnlR95fFm1YA1M5QOfS2ztq9rwWYdOM= ngcBQ&amp;e=3D" moz-do-not-send=3D"true"><span style=3D"color: rgb(31,=0A= 73, 125); text-decoration: none;"><img id=3D"Image_= x0020_5" src=3D"cid:part1.BA6F76FC.2829C84D@xxxxxxxx" alt=3D"Universit=E9 d= e Montr=E9al" type=3D"image/png" class=3D"" width=3D"79" height=3D"31" bord= er=3D"0"></span></a><span style=3D"font-size: 10pt; font-family: Arial,=0A= sans-serif; color: rgb(31, 73, 125);"><o:p></o:p></sp= an></p> </td> <td style=3D"width: 238.1pt; padding: 0cm 5.4pt; height:=0A= 19.7pt;" width=3D"317" valign=3D"top"> <p class=3D"MsoNormal" style=3D"margin-top: 0cm;=0A= margin-right: 0cm; margin-left: -5.4pt;"> <span style=3D"position: absolute; z-index: 251671552;=0A= left: 0px; margin-left: 1px; margin-top: 5px;=0A= width: 295px; height: 1px;"><img src=3D"cid:part3.38C= 987DF.E8C8B595@xxxxxxxx" v:shapes=3D"Image_x0020_6" type=3D"image/png" clas= s=3D"" width=3D"295" height=3D"1"></span><b><span style=3D"font-size: 5pt; = font-family: Arial,=0A= sans-serif; color: rgb(127, 127, 127);"><o:p></o:p>= </span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm;=0A= margin-right: 0cm; margin-left: -5.4pt;"> <b><span style=3D"font-size: 7pt; font-family: Arial,=0A= sans-serif; color: rgb(127, 127, 127);"><br> </span></b></p> <p class=3D"MsoNormal" style=3D"margin-top: 0cm;=0A= margin-right: 0cm; margin-left: -5.4pt;"> <b><span style=3D"font-size: 7pt; font-family: Arial,=0A= sans-serif; color: rgb(127, 127, 127);">Address : c= .p. 6128, succ. 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Bernstein, Ph.D. </span></b><b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;= ,sans-serif;=0A= mso-fareast-font-family:&quot;Times New Roman=0A= \;color\:\#585858&quot;">| </span></b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sa= ns-serif;mso-fareast-font-family:&quot;Times=0A= New Roman \;color\:\#585858&quot;">Professor</span><span style=3D"m= so-fareast-font-family: &quot;Times New Roman&quot;"><o:p></o:p></span><spa= n style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif;=0A= mso-fareast-font-family:&quot;Times New Roman=0A= \;color\:\#585858&quot;"><br> Depts. of Neuroscience and Surgery (Otolaryngology)| UConn School of Medici= ne </span> <br> <span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif;= =0A= mso-fareast-font-family:&quot;Times New Roman=0A= \;color\:\#585858&quot;"></span><span style=3D"font-size:10.0pt;fon= t-family:&quot;Arial&quot;,sans-serif;=0A= mso-fareast-font-family:&quot;Times New Roman=0A= \;color\:\#585858&quot;">263 Farmington Avenue, Farmington, CT 06030-3401</span><br> <span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif;= =0A= mso-fareast-font-family:&quot;Times New Roman=0A= \;color\:\#585858&quot;"></span><span style=3D"font-size:10.0pt;fon= t-family:&quot;Arial&quot;,sans-serif;=0A= mso-fareast-font-family:&quot;Times New Roman=0A= \;color\:\#585858&quot;">Office: 860.679.4622 | Fax: 860.679.2495<br> <br> <img alt=3D"" src=3D"cid:part5.BEEC4A1D.EB39E8C2@xxxxxxxx" width=3D"125" he= ight=3D"48"><br> </span></div> </body> </html> --_000_1ffcf2e0cd044070b5bd207f9e158e18NSOITEXCMB21uchcnet_-- --_006_1ffcf2e0cd044070b5bd207f9e158e18NSOITEXCMB21uchcnet_ Content-Type: image/png; 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