Abstract
A class of methods for speedily estimating the acoustic impedance of surfaces is presented. The methods utilize a lattice search algorithm to estimate the impedance that will validate analytical expressions for ground attenuation of sound, using experimental measurements of continuous-wave sound attenuation changes between two above-ground sound source locations with respect to a single microphone close to the ground. In the two cases considered, opportunities appear to exist for a considerable reduction in computation complexity: in the first case, the arrangement allows spherical spreading components of the excess attenuation terms to essentially cancel out. In the second case, the arrangement allows the boundary loss factor to remain constant while the source sound location changes. Variations in meteorological parameters between the two sound source locations are assumed negligible. These proposed analytical and experimental arrangements display the potential to provide a means of obtaining speedy and efficient estimates of ground impedance for various surfaces. [Work supported by the U.S. Army Research Office.]
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