Subject: [AUDITORY] RF Tx Frequencies used by CI Processors and Interference From: Sharath Chandra Ramakrishnan <looplogic@xxxxxxxx> Date: Wed, 15 Jan 2025 01:16:49 -0600--000000000000b3b713062bb97623 Content-Type: text/plain; charset="UTF-8" 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 <http://illinois.edu/> --000000000000b3b713062bb97623 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <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 :=C2=A0</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= seem to be captured in their technical manuals.</div><div><br></div><div>2= . Have there been any studies or reports on RF interference based disturban= ces experienced by cochlear implant listeners? For instance, there are seve= ral industrial remote control equipment, baby monitors=C2=A0etc operating= =C2=A0specifically at and around 49 MHz. I am sure there are other strong R= F transmissions that will show harmonics=C2=A0at the CI operational frequen= cies, but I am interested in interference=C2=A0caused by equipment operatin= g specifically at the CI transmitter frequencies.</div><div><br></div><div>= 3. While the RF power itself is very low, can one completely rule out cross= interference=C2=A0between CI implant listeners using the same processor wh= ile interacting with each other in close physical proximity ?</div><div><br= ></div><div>Thanks</div><div>Regards</div><div><br></div><span class=3D"gma= il_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signatur= e" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div dir=3D"ltr"><sp= an style=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-heig= ht:inherit;font-family:"Segoe UI Web (West European)","Segoe= UI",-apple-system,"system-ui",Roboto,"Helvetica Neue&q= uot;,sans-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-s= ize:11pt;font-style:inherit"><i>(M.S., Ph.D.)</i></b><br></div><span style= =3D"border:0px;font-stretch:inherit;font-size:11pt;line-height:inherit;font= -family:Calibri,sans-serif;margin:0px;padding:0px;vertical-align:baseline;c= olor:rgb(19,41,75)"><b><i>Assistant Professor</i></b></span><br style=3D"co= lor:rgb(0,0,0);font-family:"Segoe UI Web (West European)","S= egoe UI",-apple-system,"system-ui",Roboto,"Helvetica Ne= ue",sans-serif;font-size:12px"><span style=3D"border:0px;font-stretch:= inherit;font-size:11pt;line-height:inherit;font-family:Calibri,sans-serif;m= argin:0px;padding:0px;vertical-align:baseline;color:rgb(19,41,75)">Universi= ty of Illinois Urbana-Champaign</span><br style=3D"color:rgb(0,0,0);font-fa= mily:"Segoe UI Web (West European)","Segoe UI",-apple-s= ystem,"system-ui",Roboto,"Helvetica Neue",sans-serif;fo= nt-size:12px"><span style=3D"border:0px;font-stretch:inherit;font-size:14.6= 667px;line-height:inherit;font-family:Calibri,sans-serif;margin:0px;padding= :0px;vertical-align:baseline;color:rgb(0,0,0)"><a href=3D"mailto:scram@xxxxxxxx= nois.edu" style=3D"border:0px;font:inherit;margin:0px;padding:0px;vertical-= align:baseline" target=3D"_blank">scram@xxxxxxxx</a></span><br style=3D= "color:rgb(0,0,0);font-family:"Segoe UI Web (West European)",&quo= t;Segoe UI",-apple-system,"system-ui",Roboto,"Helvetica= Neue",sans-serif;font-size:12px"><br style=3D"color:rgb(0,0,0);font-f= amily:"Segoe UI Web (West European)","Segoe UI",-apple-= system,"system-ui",Roboto,"Helvetica Neue",sans-serif;f= ont-size:12px"><span style=3D"border:0px;font-stretch:inherit;font-size:14.= 6667px;line-height:inherit;font-family:Calibri,sans-serif;margin:0px;paddin= g:0px;vertical-align:baseline;color:rgb(0,0,0)"><a href=3D"http://illinois.= edu/" style=3D"border:0px;font:inherit;margin:0px;padding:0px;vertical-alig= n:baseline" target=3D"_blank"><img src=3D"https://webtools.illinois.edu/web= services/js/ds/signature_logog_165.png" width=3D"165" height=3D"43" style= =3D"border:0px;font:inherit;margin:0px;padding:0px;vertical-align:baseline;= color:inherit;width:165px;height:43px"></a></span><br style=3D"color:rgb(0,= 0,0);font-family:"Segoe UI Web (West European)","Segoe UI&qu= ot;,-apple-system,"system-ui",Roboto,"Helvetica Neue",s= ans-serif;font-size:12px"></div></div></div></div> --000000000000b3b713062bb97623--