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

Claim 17:
18. A non-transitory computer-readable medium comprising a computer program stored thereon comprising instructions for implementing a method of encoding for compression of audio signals, when said instructions are executed by a processor of a processing circuit, the audio signals forming, over time, a succession of sample frames, in each of N channels in an ambisonic representation of order higher than 0, wherein the instructions configure the processing circuit to:
form, 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,
test 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
apply said rotation matrix to the signals of the N channels before encoding of said signals.