Multi channel audio processing for upmixing/remixing/downmixing applications

Abstract

A method for determining a decoding L×K matrix for decoding incoming L-dimensional channel audio into outgoing K-dimensional channel audio where L≥2 and K≥1 is provided. The method comprising: determining a panning control parameter p and a sample component d that minimizes a first difference metric between an L-dimensional input sample x and an estimation of the input sample xest=d a, where a=A(p) and where A(p) is a first pre-set mapping function that returns an L-dimensional panning vector a for a given panning control parameter p; generating a K-dimensional raw output sample yraw=d s, where s=S(p) and where S(p) is a second pre-set mapping function that returns a K-dimensional panning vector s for a given panning control parameter p, and; determining the decoding L×K matrix M by solving an optimization problem that minimizes a second difference metric between the K-dimensional raw output sample yraw and the decoded input sample x M. A method for decoding incoming L-dimensional channel audio into outgoing K-dimensional channel audio using the decoding L×K matrix is also provided.

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