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Propagation of Sound in a Refracting Medium

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The reflexion of a sound-wave is studied at an inhomogeneous layer with parallel surfaces separating two homogeneous semi-infinite media having different indices. By means of an appropriate change of function, Helmholtz's variable-coefficient equation is split up into a pair of equations of the same type, but with constant coefficients in which there appear “virtual sources” containing the unknown field. By using Green's function in. expressing the solution, these equations can be transformed into an integro-differential equation for the field and an integral equation for the virtual sources. The latter equation is solved numerically and hence the coefficient of reflexion of the plate is deduced.
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Document Type: Research Article

Publication date: February 1, 1972

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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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