Audio Directivity Coding

Abstract: The application discloses techniques for compressively encoding and decoding an audio signal representing a directivity pattern, the audio values having different values according to different discrete positions defined on an unit sphere. The audio signal values are encoded in a bitstream as prediction residual values. The prediction residual values being used in sequences to obtained predicted audio signal values by moving on positions defined on parallel lines, parallel to an equator of the sphere, the parallel lines defined from a first pole toward a second pole of the sphere. The predicted values are obtained based on an initial prediction sequence, on adjacent discrete positions preceding a given position or interpolated versions of the audio values of a previously predicted adjacent parallel line.

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