We present physical models for the sound field radiated by plates of finite size and spheres vibrating in higher modes. The intention is obtaining a model that allows for controlling the perceived spatial extent of a virtual sound source in model-based sound field synthesis. Analytical expressions for the radiated sound fields are derived and simulations of the latter are presented. An analysis of interaural coherence in a virtual listener, which has been shown to serve as an indicator for perceived spatial extent, provides an initial proof of concept.
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