Sound diffraction in the vicinity of the humanear
The experiment was designed to investigate the relative diffraction and shadow effects in the vicinity of the human ear, with a view to finding the optimum position for microphone mounting of an ear-level hearing aid. Five microphone positions, two in front of, and three behind, the ear were investigated using 0.1 octave bandwidth noise with centre frequencies of 800, 1600, 2400, 3200 and 4000 c/s. Results were obtained using ten adult subjects and showed that a microphone situated in the ear, or just in front of the ear on the cheek, gives consistently higher outputs of as much as 4 dB than for any in the behind the ear mounting positions for sound azimuths (Θ) of −60° ≦ Θ ≦60°; the 0° azimuth occurs when the subject is directly facing the sound source.
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Document Type: Research Article
Publication date: January 1, 1965
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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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