METHOD FOR DECODING AND ENCODING A DOWNMIX MATRIX, METHOD FOR PRESENTING AUDIO CONTENT, ENCODER AND DECODER FOR A DOWNMIX MATRIX, AUDIO ENCODER AND AUDIO DECODER

摘要

A method is described which decodes a downmix matrix for mapping a plurality of input channels of audio content to a plurality of output channels, the input and output channels being associated with respective speakers at predetermined positions relative to a listener position, wherein the downmix matrix is encoded by exploiting the symmetry of speaker pairs of the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels. Encoded information representing the encoded downmix matrix is received and decoded for obtaining the decoded downmix matrix.

主权项

1. A method for decoding a downmix matrix for mapping a plurality of input channels of audio content to a plurality of output channels, the input and output channels being associated with respective speakers at predetermined positions relative to a listener position, wherein the downmix matrix is encoded by exploiting the symmetry of speaker pairs of the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels, the method comprising:
receiving encoded information representing the encoded downmix matrix from an encoder; and decoding the encoded information for acquiring the decoded downmix matrix, wherein respective pairs of input and output channels in the downmix matrix comprise associated respective mixing gains for adapting a level by which a given input channel contributes to a given output channel, and wherein the method further comprises:
decoding from the information representing the downmix matrix encoded significance values, wherein respective significance values are assigned to pairs of symmetric speaker groups of the input channels and symmetric speaker groups of the output channels, the significance value indicating if a mixing gain for one or more of the input channels is zero or not; anddecoding from the information representing the downmix matrix encoded mixing gains.