MPEG-H Audio

The Next Generation of Broadcast Audio

While Dolby Atmos and DTS:X have dominated the cinematic audio conversation, MPEG-H Audio has quietly become a major force in the worlds of broadcasting and streaming. Developed by the Fraunhofer Institute (the creators of the MP3) and the MPEG standards group, MPEG-H was designed from the ground up to be a comprehensive and flexible audio solution for the future of media consumption. Its design philosophy extends beyond simple immersiveness to include unprecedented levels of interactivity and accessibility. It is a core component of new broadcast standards like ATSC 3.0 (‘NextGen TV’) in the United States and is the sole audio standard for 4K UHD broadcasts in South Korea and Brazil. This focus on broadcast and streaming gives it a different set of priorities and features compared to its cinema-focused rivals.

Key Features: Immersiveness and Interactivity

MPEG-H’s capabilities can be broken down into two main categories:

1. Immersive Sound: Like other next-gen codecs, MPEG-H supports fully immersive 3D audio. It can deliver sound using a combination of channels, sound objects, and Higher-Order Ambisonics (HOA), a format ideal for capturing and recreating a complete 360-degree soundfield, which is particularly useful for virtual and augmented reality applications.

2. Interactivity and Personalization: This is MPEG-H’s defining feature. It allows the end-user to customize their audio experience. The broadcaster or streaming service can provide multiple ‘presets’ or allow direct user control over elements within the audio stream. For example:

   • Dialogue Enhancement: Users can independently increase the volume of the dialogue track, a game-changing accessibility feature for the hard of hearing.
   • Custom Sports Mix: During a live sports event, a viewer could choose between the home or away commentators, or turn the commentary off entirely and listen only to the stadium atmosphere.
   • Multiple Languages: All language tracks can be contained within a single audio stream, allowing for seamless switching.

This interactivity is not an afterthought; it is a foundational part of the MPEG-H standard, designed to create a more engaging and accessible listening experience.

Adoption and Use Cases

Beyond its adoption in international broadcast standards, MPEG-H has found a prominent place in the music industry as the technological backbone of Sony’s 360 Reality Audio format. This platform uses MPEG-H’s object-based capabilities to create immersive music mixes that place the listener in the center of the performance. This demonstrates the codec’s versatility, as it can be adapted for a wide range of content, from live television to feature films to music. As streaming services seek to differentiate their offerings, the advanced personalization and accessibility features of MPEG-H make it a compelling choice for the future of at-home and mobile entertainment.