Diffraction at an Imhomogeneous Plane the Boundary Integral Equation Method

Propagation of sound above a plane of finite impedance has been the subject of many papers.-Recent examples giving accurate expressions for the propagation of sound from harmonic point and line sources respectively are [l] and [2].Meteorological effects, variation of ground height and impedance, limit the application of these results to environmental sound propagation.Various authors, attending to the third of these factors, have developed calculation methods for propagation from a point source over a two impedance piane