Patent ID: 8014532

Claim:
A method for determining filtering combinations of a spatial processing operation, the filtering combinations ( C l , m l ′ , m ′ ) being intended to be applied to an initial sound field representation ( P l , m ( I ) ) 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 ( P l , m ( T ) ) 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.