Patent ID: 9269360
Filing Date: 2016-02-23
CPC Classification: G10L

Claim Text:
1. A method performed by a device for deriving M output audio signals from one or more input audio signals, the method comprising: receiving the one or more input audio signals; analyzing the one or more input audio signals to derive one or more non-diffuse audio signals and N diffuse audio signals, wherein M is greater than N and is greater than two; processing the one or more non-diffuse audio signals to derive M processed non-diffuse audio signals; deriving K intermediate audio signals from the N diffuse audio signals such that each of the K intermediate audio signals is psychoacoustically decorrelated with each of the N diffuse audio signals and, if K is greater than one, is psychoacoustically decorrelated with all other of the K intermediate audio signals, wherein K is greater than or equal to one and is less than or equal to M−N; mixing the N diffuse audio signals and the K intermediate audio signals to derive M diffuse audio signals, wherein the mixing is performed according to a system of linear equations with coefficients of a matrix that specify a set of N+K vectors in an M-dimensional space, and wherein at least K of the N+K vectors are substantially orthogonal to all other vectors in the set of N+K vectors; and combining the M processed non-diffuse audio signals and the M diffuse audio signals to generate the M output audio signals.