Re: [AUDITORY] DPOAE system frequency response for testing mice (Markus Drexl )

Subject: Re: [AUDITORY] DPOAE system frequency response for testing mice From: Markus Drexl <markus.drexl@xxxxxxxx> Date: Thu, 24 May 2018 09:39:01 +0200 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY> This is a multi-part message in MIME format. --------------2622A9E5E2A8F396CCDAC78F Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable Dear Skyler while I haven't worked with the ER10B I am assuming its frequency=20 response is not flat beyond 10 kHz (and probably also changed by some=20 sort of coupler you're using to make the system usable in mice). One=20 solution might be to calculate a compensational impulse response for the=20 microphone. There are some very good papers on the procedures: Siegel J. H., =93Calibrating otoacoustic emission probes,=94 in Otoacoust= ic=20 Emissions: Clinical Applications, 3rd ed., edited by Robinette M. S. and=20 Glattke T. J. (Thieme Medical, NewYork, 2002), pp. 416=96441. Rasetshwane DM, Neely ST. Calibration of otoacoustic emission probe=20 microphones. /The Journal of the Acoustical Society of America/.=20 2011;130(4):EL238-EL243. Hope this helps, Markus Am 24.05.2018 um 00:41 schrieb Skyler Jennings: > > Dear list, > > I am helping a colleague calibrate his ABR / DPOAE system for testing=20 > auditory function in mice. His sound delivery and recording system=20 > includes Tucker Davis EC1 speakers, which are coupled to an Etymotic=20 > ER10B probe microphone system. Recently, I measured the frequency=20 > response of the system with a Larson Davis microphone that is rated=20 > out to 100 kHz. When I =A0remove the ER10B, the output of the speakers=20 > matches the expected frequency response based on TDT=92s specifications= .=20 > When the ER10B is in place, the system output rolls off above 10 kHz.=20 > Etymotic designed the ER10B for testing in humans, and it is rated out=20 > to 10 kHz; however, I have been made aware of several publications=20 > that used this probe for testing in mice. Have any of you successfully=20 > coupled EC1 speakers to an ER10B probe and achieved a flat frequency=20 > response out to 32 kHz? If so, I am hoping you will share some=20 > insights you have on achieving such a frequency response with this syst= em. > > Sincerely, > > Skyler > > -- > > Skyler G. Jennings, Ph.D., Au.D. CCC-A > > Assistant Professor > > Department of Communication Sciences and Disorders > > College of Health University of Utah > > 390 South 1530 East > > Suite 1201 BEHS > > Salt Lake City, UT 84112 > > 801-581-6877 (phone) > > 801-581-7955 (fax) > > skyler.jennings@xxxxxxxx <mailto:skyler.jennings@xxxxxxxx> > --=20 Dr. Markus Drexl Deutsches Schwindel- und Gleichgewichtszentrum (DSGZ) Klinikum der Universit=E4t M=FCnchen Campus Gro=DFhadern Marchioninistr. 15 81377 M=FCnchen Tel.: ++49 89 2180 74340 http://www.ifb.klinikum.uni-muenchen.de --------------2622A9E5E2A8F396CCDAC78F Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dwindows-1252"> </head> <body text=3D"#000000" bgcolor=3D"#FFFFFF"> Dear Skyler while I haven't worked with the ER10B I am assuming its frequency response is not flat beyond 10 kHz (and probably also changed by some sort of coupler you're using to make the system usable in mice). One solution might be to calculate a compensational impulse response for the microphone. There are some very good papers on the procedures: Siegel J. H., =93Calibrating otoacoustic emission probes,=94= in Otoacoustic Emissions: Clinical Applications, 3rd ed., edited by Robinette M. S. and Glattke T. J. (Thieme Medical, NewYork, 2002), pp. 416=96441.</sp= an> Rasetshwane DM, Neely ST. Calibration of otoacoustic emission probe microphones. The Journal of the Acoustical Society of America. 2011;130(4):EL238-EL243. Hope this helps, Markus <div class=3D"moz-cite-prefix">Am 24.05.2018 um 00:41 schrieb Skyler Jennings: </div> <blockquote type=3D"cite" cite=3D"mid:12903_1527134849_5B063A81_12903_92_10_4A5C710244AF2E45ADA18C0= 89FD1B9D3A779E0E1@xxxxxxxx"> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dwindows-1252"> <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"> <style></style> <div class=3D"WordSection1"> Dear list,<o:p></o:p> <o:p>=A0</o:p> I am helping a colleague calibrate his ABR / DPOAE system for testing auditory function in mice. His sound delivery and recording system includes Tucker Davis EC1 speakers, which are coupled to an Etymotic ER10B probe microphone system. Recently, I measured the frequency response of the system with a Larson Davis microphone that is rated out to 100 kHz. When I =A0remove the ER10B, the output of the speakers matches the expected frequency response based on TDT=92s specifications. When the ER10B is in place, the system output rolls off above 10 kHz. Etymotic designed the ER10B for testing in humans, and it is rated out to 10 kHz; however, I have been made aware of several publications that used this probe for testing in mice. Have any of you successfully coupled EC1 speakers to an ER10B probe and achieved a flat frequency response out to 32 kHz? If so, I am hoping you will share some insights you have on achieving such a frequency response with this system.<o:p></o:p> <o:p>=A0</o:p> Sincerely,<o:p></o:p> <o:p>=A0</o:p> Skyler =A0=A0=A0<o:p></o:p> <o:p>=A0</o:p> --<o:p></o:p= > Skyler G. Jennings, Ph.D., Au.D. CCC-A<o:p></o:p> Assistant Professor<o:p></o:p> Department o= f Communication Sciences and Disorders <o:p></o:p> College of Health University of Utah<o:p></o:p> 390 South 15= 30 East<o:p></o:p> Suite 1201 B= EHS<o:p></o:p> Salt Lake Ci= ty, UT 84112<o:p></o:p> 801-581-6877 (phone)<o:p></o:p> 801-581-7955 (fax)<o:p></o:p> <a href=3D"mailto:skyler.jennings@xxxxxxxx" moz-do-not-send=3D"true">skyl= er.jennings@xxxxxxxx</a><o:p></o:p> <o:p>=A0</o:p> </div> </blockquote> <pre class=3D"moz-signature" cols=3D"72">--=20 Dr. Markus Drexl Deutsches Schwindel- und Gleichgewichtszentrum (DSGZ) Klinikum der Universit=E4t M=FCnchen Campus Gro=DFhadern Marchioninistr. 15 81377 M=FCnchen Tel.: ++49 89 2180 74340 <a class=3D"moz-txt-link-freetext" href=3D"http://www.ifb.klinikum.uni-mu= enchen.de">http://www.ifb.klinikum.uni-muenchen.de</a></pre> </body> </html> --------------2622A9E5E2A8F396CCDAC78F--

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