The IA parser follows user preferences and playback device layout when selecting a Mix Presentation from multiple options, with loudness information being used directly for normalization if there is a mismatch between loudness_layout and the playback layout. A limiter can also be used to preserve energy instead of using normalization factors.

The specification includes preferred dynamic down-mixing matrices generated by the down-mixing mechanism specified in Annex A2.2: Down-Mix Mechanism (Informative), as well as static down-mix matrices for 3.1.2ch from 5.1.2ch, 5.1.4ch, 7.1.2ch, and 7.1.4ch.

To better understand how this works in practice, let’s take an example: imagine you have a movie with surround sound that you want to watch on your phone without headphones or expensive equipment. The Immersive Audio Model for Mobile Devices would combine the audio streams from all of the speakers into one immersive listening experience using Ambisonics representation and 3D sound technology, allowing you to hear sounds as if they were coming from different directions around you on your phone’s speaker.

This is achieved by reconstructing the Audio Element in a specific order based on input channel layout following ACN channel ordering and SN3D normalization. The IA parser follows user preferences and playback device layout when selecting a Mix Presentation from multiple options, with loudness information being used directly for normalization if there is a mismatch between loudness_layout and the playback layout.

For example, let’s say you have a 5.1 surround sound system at home but want to watch a movie on your phone while traveling without headphones or expensive equipment. The Immersive Audio Model for Mobile Devices would combine the audio streams from all of the speakers into one immersive listening experience using Ambisonics representation and 3D sound technology, allowing you to hear sounds as if they were coming from different directions around you on your phone’s speaker.

The specification includes preferred dynamic down-mixing matrices generated by the down-mixing mechanism specified in Annex A2.2: Down-Mix Mechanism (Informative), as well as static down-mix matrices for 3.1.2ch from 5.1.2ch, 5.1.4ch, 7.1.2ch, and 7.1.4ch.

Overall, the Immersive Audio Model for Mobile Devices provides a more immersive listening experience without requiring expensive equipment or headphones, making it accessible to everyone regardless of their budget or location.