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Objective Assessment of Multichannel Cochlear Implants: Comparison Between Different Strategies for Vowel Recognition

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In order to improve and facilitate the assessment of speech recognition performances with cochlear implants (CIs), we have proposed a method [1] based on the processing of large speech databases by the CI and the transfer of the implant output signals on computer for the purpose of automatic classification into phonetic categories (TRANSCLAS method). Automatic assessments obtained with a Digisonic DX 10 suggested that correct classification of vowels is better with the "Mel" tuning strategy, in which Digisonic channels are equally spaced on a psychoacoustic scale, than with the "Linear" strategy, in which channel frequencies are equally spaced in Hz. The better performance of the Mel strategy was due to a higher channel density in the vowel formant frequency range. The main purpose of the present work is to see if the implant performance can be improved by a further increase of channel density in the formant frequency range and by using an energy gain of 6 dB per octave ("Mel Modified High Shaping Strategy", or "MMHS"). Automatic assessments suggest that these strategy modifications have a slight negative effect when all 15 channels are active. However, vowel recognition is more resistant to signal distortions with the MMHS strategy.
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Document Type: Research Article

Publication date: September 1, 1998

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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