Local Wave Field Synthesis by Temporal Bandlimitation

Firtha, Gergely and Hahn, Nara and Schultz, Frank and Fiala, Péter (2023) Local Wave Field Synthesis by Temporal Bandlimitation. Proc. of I3DA: Immersive and 3D Audio: from Architecture to Automotive. pp. 1-10.

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Abstract

Wave Field Synthesis (WFS) aims at the reproduction of a desired target wavefront by driving an ideally continuous loudspeaker distribution with properly chosen secondary source driving signals. In practical applications, using a discrete set of loudspeakers degrades the accuracy of reproduction heavily due to the violation of the theoretical requirements. As a result, spatial aliasing wavefronts emerge from the individual loudspeaker elements in addition to the intended virtual wavefront, perceived as strong coloration above the so-called spatial aliasing frequency. Local Wave Field Synthesis (LWFS) approaches improve the reproduction accuracy over a limited listening area by allowing stronger artifacts outside the control region. The present contribution discusses a novel LWFS approach, relying on the transformation of spatially defined antialiasing filters into an equivalent temporal filter bank. The resulting antialiased driving functions ensure aliasing-free synthesis at a predefined listening position at the cost of temporally bandlimited sound field at other listening regions. The results of the proposed approach are compared with a recent LWFS approach employing direct spatial bandlimitation.

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