US 11,922,959 B2
Spatialized audio coding with interpolation and quantization of rotations
Stéphane Ragot, Chatillon (FR); and Pierre Mahe, Chatillon (FR)
Assigned to ORANGE, Issy-les-Moulineaux (FR)
Appl. No. 17/436,390
Filed by ORANGE, Issy-les-Moulineaux (FR)
PCT Filed Feb. 10, 2020, PCT No. PCT/EP2020/053264
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/177981, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 19305254 (EP), filed on Mar. 5, 2019.
Prior Publication US 2022/0148607 A1, May 12, 2022
Int. Cl. G10L 19/032 (2013.01); G10L 19/002 (2013.01); G10L 19/008 (2013.01); G10L 19/06 (2013.01)
CPC G10L 19/032 (2013.01) [G10L 19/002 (2013.01); G10L 19/008 (2013.01); G10L 19/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of encoding for compression of audio signals forming, over time, a succession of sample frames, in each of N channels in an ambisonic representation of order higher than 0, the method being implemented by an encoding device and comprising:
forming, based on the channels and for a current frame, a matrix of inter-channel covariance, and searching for eigenvectors of said covariance matrix with a view to obtaining a matrix of eigenvectors,
testing the matrix of eigenvectors to verify that the matrix represents a rotation in an N-dimensional space, and if not, correcting the matrix of eigenvectors until a rotation matrix is obtained, for the current frame, and
applying said rotation matrix to the signals of the N channels before encoding of said signals.