Abstract
The study of the effect of a horizontal hard striplike element on a side wall is presented. This may give an estimate of the usefulness of such elements in reinforcing the early sound components in a listening room. The theoretical calculations are based on geometrical assumptions in combination with a diffraction model to take into account the diffraction by the edge of the scattering element. This latter is based on the time-domain theory of Biot and Tolstoy for the diffraction by a hard wedge applied to the half-plane. An accurate and useful approximation for the diffracted field in the frequency domain using Fresnel integrals is presented. Some measurements on a scale model are also presented.
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