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An Improved Hyperbaric Speech Transcoder

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This paper deals with a technique for improving the restoration of the spectral properties of the speech of deep-sea divers operating under various conditions of gas mixtures and diving depths. The method used here is based on the modified digital channel vocoder. Intelligibility problems linkes to hyperbaric speech are briefly described. The limits of the usual channel vocoder for this kind of correction are also discussed, particularly those concerning the frequency domain of application of Fant-Lindquist's formant law. In some cases, the use of this law in its indirect form may lead to the calculation of the square root of a negative number. Solutions are then put forward, and hyperbaric speech records from "Hydra IV" (physiological experiments using pressurised helium diving) are processed to validate the proposed method.
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Document Type: Research Article

Publication date: January 1, 2001

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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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