Patent ID: 8014532
Filing Date: 2011-09-06
Classification: G06F,H04S

Abstract:
1. A method for determining filtering combinations of a spatial processing operation, the filtering combinations being intended to be applied to an initial sound field representation formed by coefficients representative of the initial sound field in time and in the three spatial dimensions, in order to provide a modified sound field representation formed by coefficients representative field representative of that field in time and in the three spatial dimensions, the method comprising: defining (2) via a programmed computer processor the processing operation by a set of at least one directivity function, defining via a programmed processor a predetermined operation applied on the initial sound field representation and the set of at least one directivity function, establishing (4) via a programmed computer processor spherical harmonic coefficients of each directivity function; determining via a programmed processor weighting coefficients (c) associated with the predetermined operation, wherein determining (6) filtering combinations comprises determining (30) each filtering combination from a linear combination of the spherical harmonic coefficients (G) with the weighting coefficients (c), and determining (6) via a programmed computer processor the filtering combinations from the spherical harmonic coefficients.