Physical Properties of Local Wave Field Synthesis using Circular Loudspeaker Arrays

Invited paper

Fiete Winter

University of Rostock

Monday 1 june, 2015, 11:20 - 11:40

0.3 Copenhagen (49)

The reproduction accuracy of sound field synthesis techniques, like e.g. Wave Field Synthesis (WFS) or near field compensated Higher-Order Ambisonics, is limited due to practical aspects. For the audible frequency range the desired sound field can not be synthesized aliasing-free over an extended listening area, which is surrounded by a discrete ensemble of individually driven loudspeakers. However, it is suitable for certain applications to increase reproduction accuracy inside a smaller (local) listening region while stronger artifacts outside are permitted. A local Wave Field Synthesis method utilizes focused sources as a distribution of virtual loudspeakers which are placed more densely around the local listening area. These virtual loudspeakers are then driven by WFS techniques. This paper establishes an analytical framework to analyze the physical properties of this approach for circular loudspeaker arrays.

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