Local wave field synthesis of a moving point source using temporal bandlimitation

Firtha, Gergely and Hahn, Nara and Schultz, Frank and Fiala, Péter (2024) Local wave field synthesis of a moving point source using temporal bandlimitation. Proc. of DAGA 2024: 50. Jahrestagung für Akustik. pp. 1-4.

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Abstract

Wave Field Synthesis (WFS) aims at the reproduction of a desired target wavefront by driving an ideally continuous point source distribution with properly chosen secondary source driving signals. In practical applications, a finite number of closely spaced loudspeakers are used, resulting in the presence of spatial aliasing wavefronts that significantly degrade synthesis accuracy. Local Wave Field Synthesis (LWFS) approaches seek to mitigate aliasing wavefronts within a limited control region, at the cost of bandlimiting the synthesis outside this area. Recently, a novel LWFS approach has been introduced by the present authors, relying merely on temporal driving function filtering. However, a notable limitation of this technique is that the synthesis bandwidth depends on the spatial characteristics of the virtual sound field, even within the control region. This contribution addresses this limitation by allowing minor aliasing contributions to achieve fullband synthesis in the predefined listening position. The performance of this solution is assessed through the synthesis of a dynamically changing virtual field, specifically the reproduction of a moving point source.

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