Following recent trends of fully immersive virtual reality (VR) and augmented reality (AR) applications, ISO/IEC JTC1 SC29 WG6, MPEG Audio coding, decided to create the MPEG-I Audio work-item for standardizing a solution for audio rendering in such applications, in which the user can navigate and interact with the environment using 6 degrees of freedom (6DoF). One of the main capabilities of MPEG-I Audio will be the support of real-time modeling of acoustic occlusion and diffraction effects for geometrically complex VR/AR scenes, including a high degree of user interactivity. This can be achieved by employing a voxel-based representation of sound-occluding scene elements in combination with computationally efficient rendering algorithms, operating on uniform 3D voxel grids and their 2D projections. This paper describes the chosen reference model architecture for voxel-based acoustic occlusion and diffraction modeling, operating modes and envisioned applications. In addition, it summarizes the current status of the MPEG-I Audio standardization process.
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