In this paper, we present a novel representation and rendering model for extended (or, volumetric) sound sources, i.e., sound sources that have a defined size and/or shape. Specifically, we focus on so-called heterogeneous extended sound sources, which are extended sound sources that have a specific non-uniform spatial audio characteristic over their spatial extent. The described representation and rendering model enable a realistic and efficient representation and rendering of sound sources with a defined size, which adds to the overall feel of immersion and enables a wide range of new dynamic experiences for listeners while exploring an XR scene. The paper describes the concept of heterogenous extended sound sources, as well as technical details about their rendering. The concept as described in this paper has been adopted into the new MPEG-I Immersive audio standard for 6DoF VR and AR audio, and the integration of the concept into this standard is briefly described as well.
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