Subject: Re: [AUDITORY] RF Tx Frequencies used by CI Processors and Interference From: =?UTF-8?B?VGFtw6FzIEhhcmN6b3M=?= <tamas.harczos@xxxxxxxx> Date: Wed, 15 Jan 2025 12:27:47 +0100This is a multi-part message in MIME format. --19469b833f018b828717c54ca1 Content-Type: text/plain; format=flowed; charset="UTF-8" Content-Transfer-Encoding: 8bit Dear Sharath, You will find information about RF carriers in the excellent paper from Fan-Gang Zeng et al., see https://doi.org/10.1109/RBME.2008.2008250 . Best, Tamas Am 15. Januar 2025 08:26:08 schrieb Sharath Chandra Ramakrishnan <looplogic@xxxxxxxx>: > Dear all > > I have a few questions regarding RF Tx Frequencies used by CI Processors > and associated interference : > > 1. Can anyone point me to documents or know the values of radio frequencies > used by RF transmitters of the sound processors of cochlear implants? I > know Advanced Bionics uses 49 MHz for some of their processors (Harmony, > Neptune). What about their other processors, and what about Cochlear Corp > and MeD-EL? This information doesn't seem to be captured in their technical > manuals. > > 2. Have there been any studies or reports on RF interference based > disturbances experienced by cochlear implant listeners? For instance, there > are several industrial remote control equipment, baby monitors etc > operating specifically at and around 49 MHz. I am sure there are other > strong RF transmissions that will show harmonics at the CI operational > frequencies, but I am interested in interference caused by equipment > operating specifically at the CI transmitter frequencies. > > 3. While the RF power itself is very low, can one completely rule out cross > interference between CI implant listeners using the same processor while > interacting with each other in close physical proximity ? > > Thanks > Regards > > -- > > Sharath Chandra Ramakrishnan > > (M.S., Ph.D.) > > Assistant Professor > University of Illinois Urbana-Champaign > scram@xxxxxxxx --19469b833f018b828717c54ca1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.= w3.org/TR/html4/loose.dtd"> <html> <body> <div dir=3D"auto"> <div dir=3D"auto">Dear Sharath,</div><div dir=3D"auto"><br></div><div dir= =3D"auto">You will find information about RF carriers in the excellent pape= r from Fan-Gang Zeng et al., see <a href=3D"https://doi.org/10.1109/RBME.20= 08.2008250">https://doi.org/10.1109/RBME.2008.2008250</a> .</div><div dir= =3D"auto"><br></div><div dir=3D"auto">Best, </div><div dir=3D"auto">Ta= mas</div><div dir=3D"auto"><br></div> <div id=3D"aqm-original" style=3D"color: black;"> <!-- body start --> <div class=3D"aqm-original-body"> <div style=3D"color: black;"> <p style=3D"color: black; font-size: 10pt; font-family: sans-serif; margin:= 8pt 0;">Am 15. Januar 2025 08:26:08 schrieb Sharath Chandra Ramakrishnan &= lt;looplogic@xxxxxxxx>:</p> <blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 0.75= ex; border-left: 1px solid #808080; padding-left: 0.75ex;"> <div dir=3D"ltr"><div>Dear all</div><div><br></div><div>I have a few questi= ons regarding RF Tx Frequencies used by CI Processors and associated interf= erence : </div><div><br></div><div>1. Can anyone point me to documents= or know the values of radio frequencies used by RF transmitters of the sou= nd processors of cochlear implants? I know Advanced Bionics uses 49 MHz for= some of their processors (Harmony, Neptune). What about their other proces= sors, and what about Cochlear Corp and MeD-EL? This information doesn't see= m to be captured in their technical manuals.</div><div><br></div><div>2. Ha= ve there been any studies or reports on RF interference based disturbances = experienced by cochlear implant listeners? For instance, there are several = industrial remote control equipment, baby monitors etc operating = specifically at and around 49 MHz. I am sure there are other strong RF tran= smissions that will show harmonics at the CI operational frequencies, = but I am interested in interference caused by equipment operating spec= ifically at the CI transmitter frequencies.</div><div><br></div><div>3. Whi= le the RF power itself is very low, can one completely rule out cross inter= ference between CI implant listeners using the same processor while in= teracting with each other in close physical proximity ?</div><div><br></div= ><div>Thanks</div><div>Regards</div><div><br></div><span class=3D"gmail_sig= nature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature" dat= a-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div dir=3D"ltr"><span sty= le=3D"color:rgb(0,0,0)">Sharath Chandra Ramakrishnan</span><br></div><div><= div style=3D"border:0px;font-stretch:inherit;font-size:12px;line-height:inh= erit;font-family:"Segoe UI Web (West European)","Segoe UI&qu= ot;,-apple-system,"system-ui",Roboto,"Helvetica Neue",s= ans-serif;margin:0px;padding:0px;vertical-align:baseline;color:rgb(0,0,0)">= <b style=3D"color:rgb(19,41,75);font-family:Calibri,sans-serif;font-size:11= pt;font-style:inherit"><i>(M.S., Ph.D.)</i></b><br></div><span style=3D"bor= der:0px;font-stretch:inherit;font-size:11pt;line-height:inherit;font-family= :Calibri,sans-serif;margin:0px;padding:0px;vertical-align:baseline;color:rg= b(19,41,75)"><b><i>Assistant Professor</i></b></span><br style=3D"color:rgb= (0,0,0);font-family:"Segoe UI Web (West European)","Segoe UI= ",-apple-system,"system-ui",Roboto,"Helvetica Neue"= ;,sans-serif;font-size:12px"><span style=3D"border:0px;font-stretch:inherit= ;font-size:11pt;line-height:inherit;font-family:Calibri,sans-serif;margin:0= px;padding:0px;vertical-align:baseline;color:rgb(19,41,75)">University of I= llinois Urbana-Champaign</span><br style=3D"color:rgb(0,0,0);font-family:&q= uot;Segoe UI Web (West European)","Segoe UI",-apple-system,&= quot;system-ui",Roboto,"Helvetica Neue",sans-serif;font-size= :12px"><span style=3D"border:0px;font-stretch:inherit;font-size:14.6667px;l= ine-height:inherit;font-family:Calibri,sans-serif;margin:0px;padding:0px;ve= rtical-align:baseline;color:rgb(0,0,0)"><a href=3D"mailto:scram@xxxxxxxx= u" style=3D"border:0px;font:inherit;margin:0px;padding:0px;vertical-align:b= aseline" target=3D"_blank">scram@xxxxxxxx</a></span><br style=3D"color:= rgb(0,0,0);font-family:"Segoe UI Web (West European)","Segoe= UI",-apple-system,"system-ui",Roboto,"Helvetica Neue&q= uot;,sans-serif;font-size:12px"><br style=3D"color:rgb(0,0,0);font-family:&= quot;Segoe UI Web (West European)","Segoe UI",-apple-system,= "system-ui",Roboto,"Helvetica Neue",sans-serif;font-siz= e:12px"><span style=3D"border:0px;font-stretch:inherit;font-size:14.6667px;= line-height:inherit;font-family:Calibri,sans-serif;margin:0px;padding:0px;v= ertical-align:baseline;color:rgb(0,0,0)"><a href=3D"http://illinois.edu/" s= tyle=3D"border:0px;font:inherit;margin:0px;padding:0px;vertical-align:basel= ine" target=3D"_blank"><img src=3D"https://webtools.illinois.edu/webservice= s/js/ds/signature_logog_165.png" width=3D"165" height=3D"43" style=3D"borde= r:0px;font:inherit;margin:0px;padding:0px;vertical-align:baseline;color:inh= erit;width:165px;height:43px"></a></span><br style=3D"color:rgb(0,0,0);font= -family:"Segoe UI Web (West European)","Segoe UI",-appl= e-system,"system-ui",Roboto,"Helvetica Neue",sans-serif= ;font-size:12px"></div></div></div></div> </blockquote> </div> </div> <!-- body end --> </div><div dir=3D"auto"><br></div> </div></body> </html> --19469b833f018b828717c54ca1--