STSF

Spatial Transformation of Sound Fields (STSF) is a method for mathematically describing the sound field based on a set of measurements. The system is unique in giving detailed information on the sound field both close to the test object (near field) and further away from the test object (far field) in one measurement. As the name suggests, STSF takes the sound field measured in one plane and uses various algorithms to transform it spatially to other planes, giving the resulting sound field in this new plane. This allows a whole range of sound field parameters to be calculated at any point in the vicinity of the test object including pressure distribution, intensity mapping and vector intensity for the near field and directivity patterns, SPL along a line, and contribution analysis in the far field. Usefully, "what if" scenarios can be played out allowing you to investigate the effect in the far field of changes made to the noise source.