Evaluation of a boss model and subtraction technique for predicting wideband scattering phenomena in room acoustics

Journal article, 2006

Scattering from a hard hemisphere on an infinite plane is studied experimentally and theoretically in a laboratory environment using a subtraction technique. With this technique, the scattered field is determined by subtracting the transient responses from the plane with and without the boss present. Scattering for different combinations of transducer and hemisphere positions are then classified into a number of cases, denoted in-plane/off-plane and back-/forward/mixed scattering. Theoretical and experimental results are compared and evaluated from an auralization point of view using a one-third octave band smoothing of the contribution from the hemisphere. With the smoothing used, average intensity level discrepancies typically less than 3 dB are obtained for a 6 octaves wide ka -interval, where a equals the hemisphere radius. © 2006 Acoustical Society of America.