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Speech Modifications to Increase the Intelligibility of Vocal Messages Broadcast by Driving Assistance Systems Intended For Hearing-Impaired Drivers

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The purpose of the AIDA (Automobile Intelligible pour Déficients Auditifs - Intelligible automobile for hearing impaired) project is to develop speech modifications tools to increase the intelligibility of voice messages broadcast by driving assistance systems embedded in personal vehicles. The target audience for this project is people suffering from mild and moderate hearing loss. This article presents an approach to increase the intelligibility of natural speech signals by signal processing methods based on filtering and dynamic compression. The magnitude of the filter was defined from a global SII (Speech Intelligibility Index) optimisation method in a driving situation incorporating hearing loss via the use of a hearing loss simulator. The effect of these speech modifications on intelligibility level was assessed using a word test on ten hearing-impaired subjects. The results show a significant increase in the speech reception threshold (SRT) in two different in-car noises. The SRT was shifted by about –9 dB to –11 dB depending on the in-car noise compared to unmodified words with identical sound pressure levels.
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Document Type: Research Article

Publication date: July 1, 2018

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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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