THE EFFECT OF CHANGING THE INPUT DYNAMIC RANGE ON THE CI PATIENTS' SPEECH PERFORMANCE

Document Type : Preliminary preprint short reports of original research

Authors

1 aAudio-vestibular Medicine Unit, Department of Otorhinolaryngology, Faculty of Medicine, Alexandria University, Alexandria, Egypt.

2 Department of Otorhinolaryngology, Audiology unit, Faculty of Medicine Alexandria University Egypt

3 Department of Otorhinolaryngology, Audiology Unit, Department of Chest Diseases, Faculty of Medicine, Alexandria University

4 Department of Otorhinolaryngology, Audiology Unit, Faculty of Medicine, Alexandria University

Abstract

Cochlear implant is a surgically placed device that aims to replace the function of a damaged inner ear in patients with sensory-neural hearing loss.
In normal hearing the outer hair cells amplify and tunes basilar membrane motion. To replace the function of lost OHCs compression is an essential component of the CI processor.
The range of acoustic input levels that are mapped onto the CI user’s electrical dynamic range are commonly referred to as the input dynamic range. The electrical dynamic range is defined as the difference in clinical units from threshold to the most comfortable loudness level (T and MCL levels) on individual electrodes. In general, studies have shown that an IDR wider than 30 dB is needed in CI systems for optimal speech recognition.
Studies agreed that dynamic range can affect the speech perception abilities of CI users. The perceived loudness of an acoustic stimulus will also depend on the shape of the input-output function of the system. The main part of the function is not linear because an instantaneous weighting function or ‘maplaw’ is applied to the output levels in order to provide loudness growth similar to that achieved in normal acoustic hearing.

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ALEXMED ePosters
Volume 6, Issue 4
September 2024
Pages 55-56

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