Patent ID: 11922959
Assignee: ORANGE
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. An encoding device comprising:
a processing circuit configured to compress 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, by:
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.