Incorporating Loudspeaker Directivity in Array Design for Increased Spatial Aliasing Frequency in Wave Field Synthesis
* Präsentierender Autor
Zusammenfassung:Wave Field Synthesis aims at a physically accurate synthesis of a desired sound field inside a target region. Typically, the region is surrounded by a finite number of discrete loudspeakers. For practical loudspeaker setups, this spatial sampling causes spatial aliasing artefacts and does not allow for an accurate synthesis over the entire audible frequency range. Recently, the authors proposed a geometric model to predict the so-called aliasing frequency up to which the spatial aliasing is negligible for a specific listening position or area. Optimal discretisation schemes to increase this frequency for a given array geometry and desired sound field assuming omnidirectional loudspeakers were presented. This contribution extends prior work towards directive drivers as they are used in standard multi-way loudspeakers. Well-established radiation models such as the circular or line piston are investigated. The derived discretisation patterns are compared to the ones for the omnidirectional case via numerical simulations of the synthesised sound fields. The results show an increase of the aliasing frequency for the patterns optimised with the extended approach.