Coding And Decoding Of Spherical Coordinates Using An Optimized Spherical Quantization Dictionary

Abstract: The invention relates to a method for coding or decoding a spatial direction of a sound source, in which a spherical quantization dictionary is defined on a 3D sphere by coding elevation and azimuth, giving at least one coded elevation index (i) on a number of elevation levels (N?) and a number of points per level (Ny?(i)) determined on the basis of two successive cumulative cardinality values (cumN (i), cumN (i — 1)), the cumulative cardinality value (cumN(i)) being representative of a number of points proportional to a total number of points and according to the area of a spherical region comprising at least one region delimited by the upper horizontal plane (? = (i + ½)d?) of the positive elevation level of the coded elevation index (i) and a lower horizontal plane of the sphere.

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