US 8,014,532 B2Granted

Method and system for processing a sound field representation

AssigneeTrinnov Audio

InventorsRémy Bruno, Arnaud Laborie, Sébastien Montoya

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Abstract

A method of processing a sound field representation which can be used to provide a representation which has been modified by at least spatial processing. The method includes: the establishment of an initial representation of the sound field and the establishment of a representation which has been modified by filtering combinations corresponding to the processing operation. The method also includes a step which defines the processing operation and which includes: a step involving the establishment of a set of directivity functions, which is representative of the processing and which takes the form of a set of coefficients corresponding to the spherical harmonic decomposition of the functions; and a step in which the filtering combinations are determined from the decomposition so that another step involving the application of the defined filtering combinations can be performed.

Claims18

Dependent claims

A method for determining filtering combinations of a spatial processing operation, the filtering combinations

(
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being intended to be applied to an initial sound field representation
(
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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
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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.

34 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/528,762Filed 22 Sep 2003
Priority: FR 02 1173923 Sep 2002
Published: US 2006/0126852 A115 Jun 2006
Granted: 6 Sep 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04S 1/002
Two-channel systems: non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
G06F 17/14
Complex mathematical operations: fourier, Walsh or analogous domain transformations , e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
H04S 2420/03
Techniques used stereophonic systems covered by H04S but not provided for in its groups: application of parametric coding in stereophonic audio…
H04S
Stereophonic systems