	US 12,245,017 B2
	Methods, apparatus and systems for diffraction modelling based on grid pathfinding
Leon Terentiv, Erlangen (DE); Daniel Fischer, Fuerth (DE); Christof Fersch, Neumarkt (DE); and Panji Setiawan, Munich (DE)
Assigned to Dolby International AB, Dublin (IE)
Appl. No. 17/914,736
Filed by Dolby International AB, Amsterdam (NL)
PCT Filed Mar. 29, 2021, PCT No. PCT/EP2021/058105 § 371(c)(1), (2) Date Sep. 26, 2022, PCT Pub. No. WO2021/198152, PCT Pub. Date Oct. 7, 2021.
Claims priority of provisional application 63/004,539, filed on Apr. 3, 2020.
Claims priority of application No. 20167907 (EP), filed on Apr. 3, 2020.
Prior Publication US 2023/0188920 A1, Jun. 15, 2023
Int. Cl. H04S 7/00 (2006.01)

CPC H04S 7/302 (2013.01)

17 Claims

1. A method of processing audio content for rendering in a three-dimensional audio scene, wherein the audio content comprises a sound source at a source position, the method comprising:

obtaining a voxelized representation of the three-dimensional audio scene, wherein the voxelized representation indicates volume elements in which sound can propagate and volume elements by which sound is occluded;

obtaining a two-dimensional projection map for the audio scene, wherein the two-dimensional projection map is related to the voxelized representation by a projection operation that projects onto a horizontal plane, wherein the projection map comprises a grid with each element of the grid representing a horizontal position in the audio scene and indicating whether at least one volume element at that horizontal position in the voxelized representation is a volume element in which sound can propagate; and

determining parameters indicating a virtual source position of a virtual sound source based on the source position, a listener position, and the projection map, to simulate, by rendering a virtual source signal from the virtual source position, an impact of acoustic diffraction by the three-dimensional audio scene on a source signal of the sound source at the source position.