scholarly journals A Vibro-Acoustic Hybrid Implantable Microphone for Middle Ear Hearing Aids and Cochlear Implants

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1117
Author(s):  
Ki Seong ◽  
Ha Mun ◽  
Dong Shin ◽  
Jong Kim ◽  
Hideko Nakajima ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Middle Ear ◽  
Hearing Aids ◽  
Sound Pressure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Micro Electro Mechanical System ◽  
Acoustic Sensors ◽  
Human Temporal Bone ◽  
Implantable Microphone

To develop totally implantable middle ear and cochlear implants, a miniature microphone that is surgically easy to implant and has a high sensitivity in a sufficient range of audio frequencies is needed. Of the various implantable acoustic sensors under development, only micro electro-mechanical system-type acoustic sensors, which attach to the umbo of the tympanic membrane, meet these requirements. We describe a new vibro-acoustic hybrid implantable microphone (VAHIM) that combines acceleration and sound pressure sensors. Each sensor can collect the vibration of the umbo and sound pressure of the middle ear cavity. The fabricated sensor was implanted into a human temporal bone and the noise level and sensitivity were measured. From the experimental results, it is shown that the proposed method is able to provide a wider-frequency band than conventional implantable acoustic sensors.

scholarly journals Implementation of a fully implantable middle-ear hearing device chip

2021 ◽  
Vol 29 ◽  
pp. 399-413
Author(s):  
Jyung Hyun Lee ◽  
Dong Wook Kim ◽  
Ki Woong Seong ◽  
Myoung Nam Kim ◽  
Jin-Ho Cho
Keyword(s):  
Signal Processing ◽  
Middle Ear ◽  
Hearing Aids ◽  
Cmos Process ◽  
Verilog Hdl ◽  
Pulse Density ◽  
Implantable Microphone ◽  
Hearing Device ◽  
Point Fast Fourier Transform ◽  
Signal Processor

BACKGROUND AND OBJECTIVE: Recently, with the increase in the population of hearing impaired people, various types of hearing aids have been rapidly developed. In particular, a fully implantable middle ear hearing device (F-IMEHD) is developed for people with sensorineural hearing loss. The F-IMEHD system comprises an implantable microphone, a transducer, and a signal processor. The signal processor should have a small size and consume less power for implantation in a human body. METHODS: In this study, we designed and fabricated a signal-processing chip using the modified FFT algorithm. This algorithm was developed focusing on eliminating time delay and system complexity in the transform process. The designed signal-processing chip comprises a 4-channel WDRC, a fitting memory, a communication 1control part, and a pulse density modulator. Each channel is separated using a 64-point fast Fourier transform (FFT) method and the gain value is matched using the fitting table in the fitting memory. RESULTS AND CONCLUSION: The chip was designed by Verilog-HDL and the designed HDL codes were verified by Modelsim-PE 10.3 (Mentor graphics, USA). The chip was fabricated using a 0.18 μm CMOS process (SMIC, China). Experiments were performed on a cadaver to verify the performance of the fabricated chip.

scholarly journals An ultra-low noise capacitance to voltage converter for sensor applications in 0.35  µm CMOS

2017 ◽  
Vol 6 (2) ◽  
pp. 285-301 ◽  
Author(s):  
Alexander Utz ◽  
Christian Walk ◽  
Norbert Haas ◽  
Tatjana Fedtschenko ◽  
Alexander Stanitzki ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Signal To Noise Ratio ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Micro Electro Mechanical System ◽  
Low Noise ◽  
Capacitive Pressure Sensor ◽  
Sensor Applications ◽  
Wide Range ◽  
Ultra Low Noise

Abstract. In this paper we present a readout circuit for capacitive micro-electro-mechanical system (MEMS) sensors such as accelerometers, gyroscopes or pressure sensors. A flexible interface allows connection of a wide range of types of sensing elements. The ASIC (application-specific integrated circuit) was designed with a focus on ultra-low noise operation and high analog measurement performance. Theoretical considerations on system noise are presented which lead to design requirements affecting the reachable overall measurement performance. Special emphasis is put on the design of the fully differential operational amplifiers, as these have the dominant influence on the achievable overall performance. The measured input referred noise is below 50 zF/Hz within a bandwidth of 10 Hz to 10 kHz. Four adjustable gain settings allow the adaption to measurement ranges from ±750 fF to ±3 pF. This ensures compatibility with a wide range of sensor applications. The full input signal bandwidth ranges from 0 Hz to more than 50 kHz. A high-precision accelerometer system was built from the described ASIC and a high-sensitivity, low-noise sensor MEMS. The design of the MEMS is outlined and the overall system performance, which yields a combined noise floor of 200 ng/Hz, is demonstrated. Finally, we show an application using the ASIC together with a CMOS integrated capacitive pressure sensor, which yields a measurement signal-to-noise ratio (SNR) of more than 100 dB.

Foundations of Language Development in Deaf and Hard-of-Hearing Infants

2020 ◽  
pp. 19-32
Author(s):  
Dani Levine ◽  
Daniela Avelar ◽  
Roberta Michnick Golinkoff ◽  
Kathy Hirsh-Pasek ◽  
Derek M. Houston
Keyword(s):  
Language Development ◽  
Language Learning ◽  
Cochlear Implants ◽  
Hearing Aids ◽  
Hard Of Hearing ◽  
Social Processes ◽  
Effective Interventions ◽  
Hearing Devices ◽  
Language Input ◽  
Hearing Children

Copious evidence indicates that, even in the first year of life, children’s language development is beginning and is impacted by a wide array of cognitive and social processes. The extent to which these processes are dependent on early language input is a critical concern for most deaf and hard-of-hearing (DHH) children, who, unlike hearing children, are usually not immersed in a language-rich environment until effective interventions, such as hearing aids or cochlear implants, are implemented. Importantly, some cognitive and social processes are not dependent on the early availability of language input and begin to develop before children are fitted for hearing aids or cochlear implants. Interventions involving parent training may be helpful for enhancing social underpinnings of language and for maximizing DHH children’s language learning once effective hearing devices are in place. Similarly, cognitive training for DHH children may also provide benefit to bolster language development.

scholarly journals Integrated Bimodal Fitting for Unilateral CI Users with Residual Contralateral Hearing

2021 ◽  
Vol 11 (2) ◽  
pp. 200-206
Author(s):  
Gennaro Auletta ◽  
Annamaria Franzè ◽  
Carla Laria ◽  
Carmine Piccolo ◽  
Carmine Papa ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Hearing Aids ◽  
Speech Intelligibility ◽  
Hearing Aid ◽  
Performance Difference ◽  
Test Conditions ◽  
Significant Difference ◽  
Noisy Conditions ◽  
New Formula ◽  
Better Than

Background: The aim of this study was to compare, in users of bimodal cochlear implants, the performance obtained using their own hearing aids (adjusted with the standard NAL-NL1 fitting formula) with the performance using the Phonak Naìda Link Ultra Power hearing aid adjusted with both NAL-NL1 and a new bimodal system (Adaptive Phonak Digital Bimodal (APDB)) developed by Advanced Bionics and Phonak Corporations. Methods: Eleven bimodal users (Naìda CI Q70 + contralateral hearing aid) were enrolled in our study. The users’ own hearing aids were replaced with the Phonak Naìda Link Ultra Power and fitted following the new formula. Speech intelligibility was assessed in quiet and noisy conditions, and comparisons were made with the results obtained with the users’ previous hearing aids and with the Naída Link hearing aids fitted with the NAL-NL1 generic prescription formula. Results: Using Phonak Naìda Link Ultra Power hearing aids with the Adaptive Phonak Digital Bimodal fitting formula, performance was significantly better than that with the users’ own rehabilitation systems, especially in challenging hearing situations for all analyzed subjects. Conclusions: Speech intelligibility tests in quiet settings did not reveal a significant difference in performance between the new fitting formula and NAL-NL1 fittings (using the Naída Link hearing aids), whereas the performance difference between the two fittings was very significant in noisy test conditions.

Plasticity of tonotopic maps in humans: influence of hearing loss, hearing aids and cochlear implants

2009 ◽  
Vol 130 (3) ◽  
pp. 333-337 ◽  
Author(s):  
Hung Thai-Van ◽  
Evelyne Veuillet ◽  
Arnaud Norena ◽  
Jeanne Guiraud ◽  
Lionel Collet
Keyword(s):  
Hearing Loss ◽  
Cochlear Implants ◽  
Hearing Aids

Pollen-Shaped Hierarchical Structure for Pressure Sensors with High Sensitivity in an Ultrabroad Linear Response Range

2020 ◽  
Vol 12 (49) ◽  
pp. 55362-55371
Author(s):  
Tingting Zhao ◽  
Li Yuan ◽  
Tongkuai Li ◽  
Longlong Chen ◽  
Xifeng Li ◽  
...  
Keyword(s):  
Hierarchical Structure ◽  
Linear Response ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Response Range ◽  
Linear Response Range

scholarly journals Benefits of bilateral cochlear implants and/or hearing aids in children

2006 ◽  
Vol 45 (sup1) ◽  
pp. 78-91 ◽  
Author(s):  
Ruth Y. Litovsky ◽  
Patti M. Johnstone ◽  
Shelly P. Godar
Keyword(s):  
Cochlear Implants ◽  
Hearing Aids ◽  
Bilateral Cochlear Implants
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