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The effect of talker-listener angle on word intelligibility. II. In an open field

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Two experiments were conducted to study the effects on speech intelligibility of talker angle and listener angle and the distance between talker and listener under free-field conditions. Some findings were that (1) speech intelligibility falls off with distance in a manner consistent with a 3 dB per distance doubled fall-off in speech sound pressure level; (2) the intelligibility in a broad arc from −45° to +45° in front of the talker was essentially equal; (3) the effect of turning the listener 15° to 75° away from the talker was a mean gain of about 4% or a gain equivalent to about 3.5 m in distance; (4) the observed directional aspect of intelligibility agreed quite well with SPL measurements made by other investigators around the heads of a model and a human; and (5) the effects of distance and wind in this study were in general agreement with the results of previous studies.
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Document Type: Research Article

Publication date: January 1, 1964

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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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