Re: [AUDITORY] How is the signal of a cochlear implant? [Sound art Project in honor to my deaf sister] (Jan Schnupp )

Subject: Re: [AUDITORY] How is the signal of a cochlear implant? [Sound art Project in honor to my deaf sister] From: Jan Schnupp <000000e042a1ec30-dmarc-request@xxxxxxxx> Date: Tue, 9 Mar 2021 18:21:30 +0800 --00000000000084679a05bd17e455 Content-Type: multipart/alternative; boundary="00000000000084679905bd17e454" --00000000000084679905bd17e454 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dear Hugo, one thing you must appreciate is that, although there are a number of vocoders out there to simulate cochlear implants, aone Alan recommended is perfectly fine, it is nevertheless important to appreciate it is fundamentally impossible to give a true, veridical impression of the sensation cochlear implants create through acoustic stimulation of the normal cochlea. The main reason for this is that the mechanics of the cochlea links temporal stimulation patterns to places of stimulation, and CIs don't do anything like that. Many established CI designs do not pay much attention to the precise temporal patterning of stimuus pulses, so CI users lose important cues for the pitch of complex sounds, for binaural scene analysis and for spatial fearing. What exactly that means cannot be simulated with sound, although "vocoding techniques" give an impression. You may have seen the demo here which I like to use of a Beethoven sonata: http://auditoryneuroscience.com/prosthetics/music If you listen to the original it is very clearly two instruments playing two distinct melodies. The vocoded version sounds much more like a single stream and the melody is much harder to appreciate, but the rhythm is unimpaired. That demo I made with a bit of simple Matlab code, a bank of bandpass followed by envelope extraction, and then I use the envelope to modulate narrow band noise. Happy to share the code but it is pretty trivial. Good luck with your public engagement artwork, and all the best to your sister. Jan --------------------------------------- Prof Jan Schnupp City University of Hong Kong Dept. of Neuroscience 31 To Yuen Street, Kowloon Tong Hong Kong https://auditoryneuroscience.com http://jan.schnupp.net On Tue, 9 Mar 2021 at 13:15, Alan Kan <alan.kan@xxxxxxxx> wrote: > Hi Hugo, > > > > Check out https://cihackathon.com/docs/presentations. It=E2=80=99s a hack= athon > that just finished but they provide Python code for a vocoder that follow= s > the Advanced Bionics cochlear implant signal processing. All you would ne= ed > to do is just run your sound files through it. > > > > Cheers > > > > Alan > > > > --- > *Alan Kan, PhD* > Research Fellow > > *School of Engineering | Macquarie University* > Level 1, 50 Waterloo Road, Macquarie Park, NSW 2113, Australia > > *Australian Hearing Hub* > > Level 1, 16 University Avenue, Macquarie University, NSW 2109, Australia > > > > *T:* +61 (2) 9850 2247 > *E:* alan.kan@xxxxxxxx > *W:* https://researchers.mq.edu.au/en/persons/alan-kan *| **mq.edu.au* > <http://mq.edu.au/> > > *L:* www.linkedin.com/in/alan-kan > > > > *[image: Macquarie University]* <http://mq.edu.au/> > > > > *CRICOS Provider 00002J. ABN: 90 952 801 237. * > > > > > > > *This message is intended for the addressee named and may contain > confidential information. If you are not the intended recipient, please > delete the message and notify the sender. Views expressed in this message > are those of the individual sender and are not necessarily the views of > Macquarie University and its controlled entities.* > > > > > > > > > > *From:* AUDITORY - Research in Auditory Perception < > AUDITORY@xxxxxxxx> *On Behalf Of *Hugo Sol=C3=ADs > *Sent:* Sunday, 7 March 2021 11:55 PM > *To:* AUDITORY@xxxxxxxx > *Subject:* [AUDITORY] How is the signal of a cochlear implant? [Sound art > Project in honor to my deaf sister] > > > > Hi everybody, > > My names is Hugo and I am a sound artist with some background in > computer science. I have a sister that was born fully deaf and she got a > cochlear implant when she was 40 years old. She is now 48. The cochlear > changed too little in my sister's live and she doesn't describe music as > a pleasant experience. > > I want to create a piece of art where hearing people could hear the real > signal that the cochlear implant sends to the brain. I know that the > signal is processed and that pulses are generated on each one of the > electrodes. However I do not nothing about the details of the > transformation. > > I am capable of write code in Python (ussing the Essentia Library > (https://essentia.upf.edu/) in order the emulate the transformation to a > signal but I don=C2=B4t know what is the typical process. I could also wr= ite > the code in SuperCollider (https://supercollider.github.io/) but > although it has tons of unit generators it does not have as many > extractors of audio descriptors and common phsyacoustic process as Python= . > > I am not an audiologist and I have a lack of the signal processing > transformation that happens in a cochlear implant. I do know a lot about > digital signal processing though. > > So I need some basics: > > 1. Code or libraries in any programming code but ideally in Python that > does the emulation. I could write the process but I imagine that many > people has already done this and that there is opensource code already > written. > > 2. Basic reference about the process that happens in the cochlear device > that could help me to either write the code or tuning the opensource > code in order to make my piece. The work will be shown in a exhibition > and I am running out of time. So any help would be more than appreciate i= t. > > I will be forever thankfull with your support. > > Warm regards > > Hugo Sol=C3=ADs > --00000000000084679905bd17e454 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"> <div><div dir=3D"ltr" class=3D"gmail_sig= nature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir= =3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir= =3D"ltr"><div style=3D"font-size:12.8px">Dear Hugo,</div><div style=3D"font= -size:12.8px"> </div><div style=3D"font-size:12.8px">one thing you must = appreciate is that, although there are a number of vocoders out there to si= mulate cochlear implants, aone Alan recommended is perfectly fine, it is ne= vertheless important=C2=A0to appreciate it is fundamentally impossible to g= ive a true, veridical impression of the sensation cochlear implants create = through acoustic stimulation of the normal cochlea. The main reason for thi= s is that the mechanics of the cochlea links temporal stimulation patterns = to places of stimulation, and CIs don't do anything like that. Many est= ablished CI designs do not pay much attention to the precise temporal patte= rning of stimuus pulses, so CI users lose important cues for the pitch of c= omplex sounds, for binaural scene analysis and for spatial fearing. What ex= actly that means cannot be simulated with sound, although "vocoding te= chniques" give an impression. You may have seen the demo here which I = like to use of a Beethoven sonata:=C2=A0<a href=3D"http://auditoryneuroscie= nce.com/prosthetics/music">http://auditoryneuroscience.com/prosthetics/musi= c</a>=C2=A0 =C2=A0If you listen to the original it is very clearly two inst= ruments playing two distinct melodies. The vocoded version sounds much more= like a single stream and the melody is much harder to appreciate, but the = rhythm is unimpaired.=C2=A0</div><div style=3D"font-size:12.8px">That demo = I made with a bit of simple Matlab code, a bank of bandpass followed by env= elope extraction, and then I use the envelope to modulate narrow band noise= . Happy to share the code but it is pretty trivial.</div><div style=3D"font= -size:12.8px"> </div><div style=3D"font-size:12.8px">Good luck with your= public engagement=C2=A0 artwork, and all the best to your sister.</div><di= v style=3D"font-size:12.8px"> </div><div style=3D"font-size:12.8px">Jan<= /div><div style=3D"font-size:12.8px">--------------------------------------= -</div><div style=3D"font-size:12.8px">Prof Jan Schnupp City University = of Hong Kong Dept. of Neuroscience</div><div><div style=3D"font-size:12.= 8px">31 To Yuen Street,=C2=A0</div><div style=3D"font-size:12.8px">Kowloon Tong</div><div style=3D"font-size:1= 2.8px">Hong Kong</div><div style=3D"font-size:12.8px"> </div><a href=3D"= https://auditoryneuroscience.com" target=3D"_blank">https://auditoryneurosc= ience.com</a></div><div><a href=3D"http://jan.schnupp.net" target=3D"_blank= ">http://jan.schnupp.net</a></div></div></div></div></div></div></div></div= ></div></div></div> </div> <div class=3D"gmail_quote"><div dir=3D"ltr= " class=3D"gmail_attr">On Tue, 9 Mar 2021 at 13:15, Alan Kan <<a href=3D= "mailto:alan.kan@xxxxxxxx">alan.kan@xxxxxxxx</a>> wrote: </div><blo= ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left= :1px solid rgb(204,204,204);padding-left:1ex"> <div lang=3D"EN-AU"> <div class=3D"gmail-m_-212532390942490478WordSection1"> Hi Hugo, =C2=A0 Check out <a href=3D"https://cihackathon.com/d= ocs/presentations" target=3D"_blank"> https://cihackathon.com/docs/presentations</a>. It=E2=80=99s a hackathon th= at just finished but they provide Python code for a vocoder that follows th= e Advanced Bionics cochlear implant signal processing. All you would need t= o do is just run your sound files through it. =C2=A0 Cheers =C2=A0 Alan =C2=A0 = ---=C2=A0 Alan Kan, PhD Research Fellow=C2=A0 School of Engineering = | Macquarie University Level 1, 50 Waterloo Road, Macquarie Park, NSW=C2=A02113, Australia<= br> Australian Hearing Hub= Level 1, 16 University Avenue, Macquarie University, NSW 2109, A= ustralia =C2=A0 <s= pan style=3D"color:rgb(51,51,51);border:1pt none windowtext;padding:0cm">T:= =C2=A0+61 (2) 9850 2247=C2=A0 E:=C2=A0 <a href=3D"mailto:alan.kan@xxxxxxxx" tar= get=3D"_blank">alan.kan@xxxxxxxx</a>=C2=A0 W:=C2=A0<a href=3D"https://researchers.mq.edu.a= u/en/persons/alan-kan" target=3D"_blank">https://researchers.mq.edu.au/en/p= ersons/alan-kan</a>=C2=A0| =C2=A0<a href=3D"http://mq.edu.au/" title=3D"Macquarie University" targ= et=3D"_blank">mq.edu.au</a> L:= <a href=3D"http://www.linkedin.com/in/alan-kan" target=3D"_blank">www.linke= din.com/in/alan-kan</a> </= u>=C2=A0 <a href=3D"http://mq.edu.au/" target=3D"_blank"><= span style=3D"font-size:10.5pt;font-family:Corbel,sans-serif;color:rgb(159,= 20,26);border:1pt none windowtext;padding:0cm;background:white;text-decorat= ion:none"><img border=3D"0" width=3D"260" height=3D"58" style=3D"width: 2.7= 083in; height: 0.6083in;" id=3D"gmail-m_-212532390942490478Picture_x0020_1"= src=3D"cid:1781676ec4d4cff311" alt=3D"Macquarie University"></a= > CRICOS Provider 00002J. ABN: 90 952 801 237. This message is intended for the addressee named and may contain confidential information. If you are not the intended recipient, please delete the message and notify the sender. Views expressed in this message are those of the individual sender and are not necessarily the views of Macquarie University and its controlled entities. =C2=A0 =C2=A0 =C2=A0 =C2=A0 <div> <div style=3D"border-right:none;border-bottom:none;border-left:none;border-= top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm"> From: AUDITORY - Research in Auditory Perception <<a href=3D"mailt= o:AUDITORY@xxxxxxxx" target=3D"_blank">AUDITORY@xxxxxxxx</a>&= gt; On Behalf Of Hugo Sol=C3=ADs Sent: Sunday, 7 March 2021 11:55 PM To: <a href=3D"mailto:AUDITORY@xxxxxxxx" target=3D"_blank">AU= DITORY@xxxxxxxx</a> Subject: [AUDITORY] How is the signal of a cochlear implant? [Sound = art Project in honor to my deaf sister] </div> </div> =C2=A0 Hi everybody, My names is Hugo and I am a sound artist with some background in computer science. I have a sister that was born fully deaf and she got a <b= r> cochlear implant when she was 40 years old. She is now 48. The cochlear <br= > changed too little in my sister's live and she doesn't describe mus= ic as a pleasant experience. I want to create a piece of art where hearing people could hear the real <b= r> signal that the cochlear implant sends to the brain. I know that the signal is processed and that pulses are generated on each one of the electrodes. However I do not nothing about the details of the transformation. I am capable of write code in Python (ussing the Essentia Library (<a href=3D"https://essentia.upf.edu" target=3D"_blank">https://essentia.up= f.edu/</a>) in order the emulate the transformation to a signal but I don=C2=B4t know what is the typical process. I could also writ= e the code in SuperCollider (<a href=3D"https://supercollider.github.io" targ= et=3D"_blank">https://supercollider.github.io/</a>) but although it has tons of unit generators it does not have as many extractors of audio descriptors and common phsyacoustic process as Python.<= br> I am not an audiologist and I have a lack of the signal processing transformation that happens in a cochlear implant. I do know a lot about <b= r> digital signal processing though. So I need some basics: 1. Code or libraries in any programming code but ideally in Python that <br= > does the emulation. I could write the process but I imagine that many people has already done this and that there is opensource code already written. 2. Basic reference about the process that happens in the cochlear device <b= r> that could help me to either write the code or tuning the opensource code in order to make my piece. The work will be shown in a exhibition and I am running out of time. So any help would be more than appreciate it.= I will be forever thankfull with your support. Warm regards Hugo Sol=C3=ADs </div> </div> </blockquote></div> --00000000000084679905bd17e454-- --00000000000084679a05bd17e455 Content-Type: image/png; name="image001.png" Content-Disposition: inline; filename="image001.png" Content-Transfer-Encoding: base64 Content-ID: <1781676ec4d4cff311> X-Attachment-Id: 1781676ec4d4cff311 iVBORw0KGgoAAAANSUhEUgAAAQQAAAA6CAMAAAEW1ufHAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ bWFnZVJlYWR5ccllPAAAAyhpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdp bj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6 eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDIxIDc5LjE1 NTc3MiwgMjAxNC8wMS8xMy0xOTo0NDowMCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJo dHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlw dGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAv IiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RS 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maintained by:

DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University