Wave field synthesis (WFS) is a spatial sound reproduction technique that facilitates a high number of loudspeakers (secondary sources) to create a virtual auditory scene for a large listening area. It requires a sensible selection of the loudspeakers that are active for the reproduction of a particular virtual source. For virtual point sources and plane waves suitable intuitively derived selection criteria are used in practical implementations. However, for more complex virtual source models and loudspeaker array contours the selection is not straightforward. In a previous publication the author proposed a secondary source selection criterion on basis of the sound intensity vector. This contribution will extend this criterion to data-based rendering and focused sources, and will discuss truncation effects.
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