Scattering from a hemisphere on a plane - a validation of the boss model for applications in room acoustics

Paper in proceeding, 2006

Acoustic scattering from isolated objects on planar surfaces, such as semi-cylindrical columns or hemispherical armatures on walls, is a common phenomenon in room acoustics. Therefore, fast and sufficiently accurate prediction models of this for auralization purposes are of great importance in the design, improvement and analysis of auditoria. Scattering from a hemisphere on a infinite plane is studied experimentally and theoretically in a laboratory environment using a subtraction technique. Theoretical and experimental results are compared and evaluated from an auralization point of view using a 1/3 octave band level 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.