scholarly journals Sound Coding in Cochlear Implants: From electric pulses to hearing

2015 ◽  
Vol 32 (2) ◽  
pp. 67-80 ◽  
Author(s):  
Jan Wouters ◽  
Hugh Joseph McDermott ◽  
Tom Francart
Keyword(s):  
Cochlear Implants ◽  
Electric Pulses ◽  
Sound Coding

scholarly journals Hearing restoration by a low-weight power-efficient multichannel optogenetic cochlear implant system

2020 ◽  
Author(s):  
Lukasz Jablonski ◽  
Tamas Harczos ◽  
Bettina Wolf ◽  
Gerhard Hoch ◽  
Alexander Dieter ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Acoustic Stimulation ◽  
Power Efficient ◽  
Fine Grained ◽  
Sound Coding ◽  
Large Sets ◽  
Current Spread ◽  
Low Weight ◽  
Implant System ◽  
And Control

In case of deafness, cochlear implants bypass dysfunctional or lost hair cells by direct electrical stimulation (eCIs) of the auditory nerve. However, spectral selectivity of eCI sound coding is low as the wide current spread from each electrode activates large sets of neurons that align to a place-frequency (tonotopic) map in the cochlea. As light can be better confined in space, optical cochlear implants (oCIs) promise to overcome this shortcoming of eCIs. This requires fine-grained, fast, and power-efficient real-time sound analysis and control of multiple microscale emitters. Here, we describe the development, characterisation, and application for hearing restoration of a preclinical low-weight and wireless LED-based multichannel oCI system and its companion eCI system. The head-worn oCI system enabled deafened rats to perform a locomotion task in response to acoustic stimulation proving the concept of multichannel optogenetic hearing restoration in rodents.

Gender Categorization in Cochlear Implant Users

2013 ◽  
Vol 56 (5) ◽  
pp. 1389-1401 ◽  
Author(s):  
Zoé Massida ◽  
Mathieu Marx ◽  
Pascal Belin ◽  
Christopher James ◽  
Bernard Fraysse ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Normal Hearing ◽  
Acoustic Parameter ◽  
Sound Coding ◽  
Gender Categorization ◽  
Voice Morphing ◽  
Ambiguous Stimuli ◽  
Voice Processing ◽  
The Voice ◽  
Temporal Degradation

Purpose In this study, the authors examined the ability of subjects with cochlear implants (CIs) to discriminate voice gender and how this ability evolved as a function of CI experience. Method The authors presented a continuum of voice samples created by voice morphing, with 9 intermediate acoustic parameter steps between a typical male and a typical female. This method allowed for the evaluation of gender categorization not only when acoustical features were specific to gender but also for more ambiguous cases, when fundamental frequency or formant distribution were located between typical values. Results Results showed a global, though variable, deficit for voice gender categorization in CI recipients compared with subjects with normal hearing. This deficit was stronger for ambiguous stimuli in the voice continuum: Average performance scores for CI users were 58% lower than average scores for subjects with normal hearing in cases of ambiguous stimuli and 19% lower for typical male and female voices. The authors found no significant improvement in voice gender categorization with CI experience. Conclusions These results emphasize the dissociation between recovery of speech recognition and voice feature perception after cochlear implantation. This large and durable deficit may be related to spectral and temporal degradation induced by CI sound coding, or it may be related to central voice processing deficits.

scholarly journals Deep electrode insertion and sound coding in cochlear implants

2015 ◽  
Vol 322 ◽  
pp. 14-23 ◽  
Author(s):  
Ingeborg Hochmair ◽  
Erwin Hochmair ◽  
Peter Nopp ◽  
Melissa Waller ◽  
Claude Jolly
Keyword(s):  
Cochlear Implants ◽  
Sound Coding ◽  
Electrode Insertion

scholarly journals Comparison of sound perception using CIS and ACE sound coding strategies in cochlear implants

2021 ◽  
Vol 6 (3) ◽  
pp. 8-12
Author(s):  
Oleg V. Kolokolov ◽  
Aleksandr O. Kuznetsov ◽  
Anton S. Machalov ◽  
Alla A. Grigoreva
Keyword(s):  
Speech Recognition ◽  
Cochlear Implants ◽  
Hearing Aids ◽  
Full Range ◽  
Sound Field ◽  
Sound Perception ◽  
Sound Coding ◽  
National Medical ◽  
Coding Strategies ◽  
Digital Hearing Aid

Objectives to study the effect of ACE and CIS sound coding strategies on sound perception in patients with the cochlear implants system produced by Cochlear Limited. Material and methods. The study included 50 patients taking the rehabilitation course in the Astrakhan branch of the National Medical Research Center for Otorhinolaryngology of the Federal Medico-Biological Agency over the past 5 years (from 2014 to 2019). The group of subjects included children over 7 years old and adults, whose success in rehabilitation made it possible to perform a full range of tests. The patients underwent tonal threshold audiometry and speech audiometry in a free sound field; the results obtained were registered in special MS Excel tables and further analysed using statistical methods. Results. There were no statistically significant differences in hearing thresholds on tonal audiometry when using the coding strategies ACE and CIS, however, differences in speech perception were observed on average by 4.2%. The patients experienced in using hearing aids reported improved speech recognition, with scores varying within 5%. Conclusion. Using a higher-resolution coding strategy can significantly improve speech recognition, while lower-resolution coding is beneficial for patients with digital hearing aid experience.

Formant frequency discrimination with a fine structure sound coding strategy for cochlear implants

2020 ◽  
Vol 392 ◽  
pp. 107970
Author(s):  
R. Liepins ◽  
A. Kaider ◽  
C. Honeder ◽  
A.B. Auinger ◽  
V. Dahm ◽  
...  
Keyword(s):  
Fine Structure ◽  
Cochlear Implants ◽  
Frequency Discrimination ◽  
Formant Frequency ◽  
Sound Coding ◽  
Coding Strategy
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