Method and apparatus for performing an adaptive down- and up-mixing of a multi-channel audio signal

摘要

A method and apparatus for performing an adaptive down-mixing of a multichannel audio signal comprising a number of input channels, wherein a signal adaptive transformation of said input channels is performed by multiplying the input channels with a downmix block matrix comprising a fixed block for providing a set of backward compatible primary channels and a signal adaptive block for providing a set of secondary channels.

主权项

1. A method for performing an adaptive down-mixing of a multi-channel audio signal comprising a number of input channels, the method comprising:
multiplying the input channels and a fixed block to provide a set of backward compatible primary channels that enable backward compatibility of the multi-channel audio signal; and multiplying the input channels and a signal adaptive block to provide a set of secondary channels that enable preserving spatial characteristics of the multi-channel signal; wherein the fixed and signal adaptive blocks are part of a downmix block matrix and the signal adaptive block depends on an interchannel covariance of said input channels and includes an auxiliary covariance matrix determined by an orthonormal transform.