A PC-based speech processor for cochlear implant fitting that can be adjusted in real-time

Morbiwala, Tasnim A.; Svirsky, Mario A.; El-Sharkway, M.; Rizkalla, Maher

doi:10.1109/mwscas.2005.1594350

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…The simulator used herein is that of Kaiser and Svirsky (2000) as further modified by Morbiwala et al (2005) and Fitzgerald et al (2013). Briefly, the acoustic signal was digitized, low pass filtered, and divided into adjacent frequency bands by a bank of analysis filters.…”

Section: Methodsmentioning

confidence: 99%

Information theoretic evaluation of a noiseband-based cochlear implant simulator

Aguiar

Taylor

et al. 2016

Hearing Research

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Noise-band vocoders are often used to simulate the signal processing algorithms used in cochlear implants (CIs), producing acoustic stimuli that may be presented to normal hearing (NH) subjects. Such evaluations may obviate the heterogeneity of CI user populations, achieving greater experimental control than when testing on CI subjects. However, it remains an open question whether advancements in algorithms developed on NH subjects using a simulator will necessarily improve performance in CI users. This study assessed the similarity in vowel identification of CI subjects and NH subjects using an 8-channel noise-band vocoder simulator configured to match input and output frequencies or to mimic output after a basalward shift of input frequencies. Under each stimulus condition, NH subjects performed the task both with and without feedback/training. Similarity of NH subjects to CI users was evaluated using correct identification rates and information theoretic approaches. Feedback/training produced higher rates of correct identification, as expected, but also resulted in error patterns that were closer to those of the CI users. Further evaluation remains necessary to determine how patterns of confusion at the token level are affected by the various parameters in CI simulators, providing insight into how a true CI simulation may be developed to facilitate more rapid prototyping and testing of novel CI signal processing and electrical stimulation strategies.

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Section: Methodsmentioning

confidence: 99%

Information theoretic evaluation of a noiseband-based cochlear implant simulator

Aguiar

Taylor

et al. 2016

Hearing Research

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“…Toward this goal, we have developed a real-time processor that enables an individual to adjust the frequency map in real time while they listen to running speech [11], [12]. One advantage of a real-time processor is that the listener can rapidly adjust the frequency map until he or she reaches a preferred map; such a process is not possible using currently available clinical software.…”

Section: Introductionmentioning

confidence: 99%

Customized selection of frequency maps in an acoustic simulation of a cochlear implant

Fitzgerald¹,

Morbiwala²,

Svirsky³

2006

2006 International Conference of the IEEE Engineering in Medicine and Biology Society

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Cochlear implants can restore hearing to deaf individuals by electrically stimulating the auditory nerve. They do so by assigning different frequencies to different stimulating electrodes via a frequency map.We have developed a device that enables us to change the frequency map in real time. Here, in normal-hearing adults listening to an acoustic simulation of a cochlear implant, we investigate what frequency maps are initially preferred, and how the ability to understand speech with that preferred map compares with two other maps. We show that naïve listeners prefer a map that balances the need for low-frequency information with the desire for a naturally-sounding stimulus, and that initial performance with this listener-selected map is better than that with a map that distorts the signal to provide low-frequency information.

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Speech Processor Design for Cochlear Implants

Kumarappan

Ramakrishna

2012

Progress in VLSI Design and Test

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A PC-based speech processor for cochlear implant fitting that can be adjusted in real-time

Cited by 7 publications

References 2 publications

Information theoretic evaluation of a noiseband-based cochlear implant simulator

Information theoretic evaluation of a noiseband-based cochlear implant simulator

Customized selection of frequency maps in an acoustic simulation of a cochlear implant

Speech Processor Design for Cochlear Implants

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