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This paper is concerned with studying the problem of scattering of a spherical wave by a thin hard barrier on a hard plane. This problem is relevant to investigating the eect on the early part of the sound ®eld of a large room, when a simple, thin and hard strip-like element is set horizontally on a side wall. This scattering element may be a sound reinforcing re ̄ector or an idealisation of a side balcony. Three dierent calculation models based on ray acoustic concepts and on solutions to the problem of diraction by a half plane are dealt with and compared to each other. For the case of the half plane, one of the models, the Biot±Tolstoy theory of diraction, is a treatment in the time domain whereas the two other ones are approximate and give solutions in the frequency domain (one of them is the Geometrical Theory of Diraction). The expression of the diracted ®eld in the time domain approach is exact but quite complicated so that, it has not been possible to give its Fourier transform in an exact form. In an earlier publication on this subject, the problem is overcome by making a simple analytical approximation of the early part the diracted ®eld, and then, adding to its exact Fou

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Author

D. Ouis

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0003-682X)

Published

2000

Language

EN

Field

Engineering (Physical Sciences)