| 摘要 |
Noise reducing screen disposed between an elongated noise source formed by a motorway or a railway and a building located along one side of this noise source and to be shielded therefrom. This noise reducing screen comprises a continuous wall portion having a whole length 2d, built up between the elongated noise source and the building on both sides of a perpendicular drawn from the building point the most remote from the noise source and located at a distance D therefrom to the elongated noise source and a plurality of variably spaced apart posts aligned with said wall portion, these posts having a length a and a width b repectively parallel and perpendicular to the elongated source, the spacing between the nth and (n-1)th post being at most equal to DPN + (A-D)PN-1 WITH N</=2 (AND DP OR N=1) WHERE P IS THE RATIO D/(D-b) It results from this spacing that all rectilinear noise propagation paths from the noise source to the building are intercepted by the posts.
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