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

A method for encoding 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 encoding the downmix matrix comprises exploiting the symmetry of speaker pairs of the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels.

A non-transitory computer product including a computer-readable medium storing instructions for carrying out 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;
• and
• decoding the encoded information for obtaining the decoded downmix matrix.

A non-transitory computer product including a computer-readable medium storing instructions for carrying out a method for encoding 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 encoding the downmix matrix comprises exploiting the symmetry of speaker pairs of the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels

An encoder for encoding 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, the encoder comprising:

• a processor configured to encode the downmix matrix, wherein encoding the downmix matrix comprises exploiting the symmetry of speaker pairs in the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels.

A decoder 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 decoder comprising:

• a processor configured to receive encoded information representing the encoded downmix matrix, and to decode the encoded information for obtaining the decoded downmix matrix.

An audio encoder for encoding an audio signal, comprising an encoder for encoding 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, the encoder comprising:

• a processor configured to encode the downmix matrix, wherein encoding the downmix matrix comprises exploiting the symmetry of speaker pairs in the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels.

An audio decoder for decoding an encoded audio signal, the audio decoder comprising a decoder 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 decoder comprising:

• a processor configured to receive encoded information representing the encoded downmix matrix, and to decode the encoded information for obtaining the decoded downmix matrix.