Bitstream representing audio in an environment

An apparatus comprising:

• a first receiver circuit,
• wherein the first receiver circuit is arranged to receive audio data for a plurality of audio elements,
• wherein the plurality of audio elements represents audio sources in an environment;
• a second receiver circuit,
• wherein the second receiver circuit is arranged to receive a bitstream,
• wherein the bitstream comprises metadata for the audio data for the plurality of audio elements,
• wherein each of the plurality of audio elements represent audio sources in the environment,
• wherein the metadata comprises acoustic environment data for the environment,
• wherein the acoustic environment data describes a plurality of properties affecting sound propagation for the audio sources in the environment,
• wherein at least a portion of the acoustic environment data is applicable to a plurality of listening poses in the environment,
• wherein the plurality of properties affecting sound propagation comprises static properties and dynamic properties;
• and
• a renderer circuit, wherein the renderer circuit is arranged to generate output audio data for the environment in response to the audio data and the acoustic environment data;
• wherein the acoustic environment data comprises a first data group and at least one second data group,
• wherein the first data group describes an orientation representation format for representing a plurality of orientation properties,
• wherein the orientation representation format selected from the group consisting of an indication of a predetermined default orientation representation, a plurality of predetermined angles and angles on a quantized grid,
• wherein the at least one second data group comprises data describing an orientation property of the plurality of properties affecting sound propagation using the orientation representation format.

A method comprising:

• generating metadata for audio data for a plurality of audio elements,
• wherein each of the plurality of audio elements represent audio sources in an environment,
• wherein the metadata comprises acoustic environment data for the environment,
• wherein the acoustic environment data describes a plurality of properties affecting sound propagation for the audio sources in the environment,
• wherein at least a portion of the acoustic environment data is applicable to a plurality of listening poses in the environment,
• wherein the plurality of properties affecting sound propagation comprises static properties and dynamic properties;
• and
• generating a bitstream,
• wherein the bitstream comprises the metadata,
• wherein the acoustic environment data comprises a first data group and at least one second data group,
• wherein the first data group describes an orientation representation format for representing a plurality of orientation properties,
• wherein the orientation representation format selected from the group consisting of an indication of a predetermined default orientation representation, a plurality of predetermined angles and angles on a quantized grid,
• wherein the at least one second data group comprises data describing an orientation property of the plurality of properties affecting sound propagation using the orientation representation format.

A method comprising:

• receiving audio data for a plurality of audio elements representing audio sources in an environment;
• receiving a bitstream comprising metadata for the audio data for the plurality of audio elements,
• wherein the plurality of audio elements represents audio sources in the environment,
• wherein the metadata comprises an acoustic environment data for the environment,
• wherein the acoustic environment data describes a plurality of properties affecting sound propagation for the audio sources in the environment,
• wherein at least a portion of the acoustic environment data is applicable to a plurality of listening poses in the environment,
• wherein the plurality of properties affecting sound propagation comprises static properties and dynamic properties;
• and
• generating output audio data for the environment in response to the audio data and the acoustic environment data;
• wherein the acoustic environment data comprises a first data group and at least one second data group,
• wherein the first data group describes an orientation representation format,
• wherein the orientation representation format represents a plurality of orientation properties,
• wherein the orientation representation format selected from the group consisting of an indication of a predetermined default orientation representation, a plurality of predetermined angles and angles on a quantized grid,
• wherein the at least one second data group comprises data describing an orientation property of the plurality of properties affecting sound propagation using the orientation representation format.

An apparatus comprising:

• a processor circuit and a memory circuit, wherein the memory is arranged to store instructions for the processor circuit,
• wherein the processor circuit is arranged to generate metadata for audio data for a plurality of audio elements,
• wherein each of the plurality of audio elements represent audio sources in an environment,
• wherein the metadata comprises acoustic environment data for the environment,
• wherein the acoustic environment data describes a plurality of properties affecting sound propagation for the audio sources in the environment,
• wherein at least a portion of the acoustic environment data is applicable to a plurality of listening poses in the environment and wherein the plurality of properties affecting sound propagation comprises static properties and dynamic properties,
• wherein the processor circuit is arranged to generate a bitstream,
• wherein the bitstream comprises the metadata;
• wherein the acoustic environment data comprises a first data group and at least one second data group,
• wherein the first data group describes an orientation representation format for representing a plurality of orientation properties,
• wherein the orientation representation format selected from the group consisting of an indication of a predetermined default orientation representation, a plurality of predetermined angles and angles on a quantized grid,
• wherein the at least one second data group comprises data describing an orientation property of the plurality of properties affecting sound propagation using the orientation representation format.