ISO/IEC 23008-3:2022

Overview

ISO/IEC 23008-3:2022 - "Information technology - High efficiency coding and media delivery in heterogeneous environments - Part 3: 3D audio" specifies technologies for efficient transmission and flexible playback of immersive audio. The standard defines decoder architectures, metadata formats and rendering approaches to support 3D audio over diverse listening scenarios, including home theatre (3D loudspeaker and 22.2 systems), automotive entertainment, and headphone playback from mobile devices.

Key topics and technical requirements

• MPEG‑H 3D audio core decoder: Syntax, data structures and tool descriptions for the MPEG‑H 3D audio core decoder (profiles, levels and contribution modes).
• Decoder architecture and processing domains: Block diagrams, rule sets for processing in time and QMF domains, sample-rate conversion and decoder delay considerations.
• Coding tools and signal processing: Transform splitting, multichannel coding, tonal component coding, frequency‑domain prediction, LPD and bandwidth extension, high resolution envelope processing (HREP), and more.
• Object metadata and rendering: Object metadata configuration, low‑delay metadata payloads, object rendering algorithms (including loudspeaker mesh, imaginary loudspeakers and HOA rendering matrices).
• Dynamic range control (DRC) and loudness: Loudness metadata, DRC metadata syntax and decoding, selection of DRC sets, loudness normalization and peak limiting for different rendering contexts.
• SAOC 3D and scene-aware tools: Support for scene-adaptive object coding (SAOC 3D), synchronization and payload definitions for spatial object coding.
• Operational constraints and buffers: Minimum decoder input buffer, bit reservoir behavior and maximum bit rate considerations; stream access point and inter-frame dependency rules.
• Interoperability elements: Downmix matrices, compatible profile/level sets and configuration descriptors to enable flexible rendering across heterogeneous playback devices.

Applications

• Delivering immersive audio for home theatre systems, including 3D loudspeaker and 22.2 setups.
• Enabling spatial audio in automotive entertainment (in‑car rendering and loudness/DRC management).
• Streaming object‑based, immersive audio to headphones, tablets and smartphones, with metadata-driven rendering for listener personalization.
• Broadcast, streaming and on‑demand services seeking efficient coding and adaptive rendering for many playback endpoints.

Who should use this standard

• Audio codec and media delivery implementers (encoder/decoder vendors).
• Consumer electronics manufacturers (AV receivers, TVs, mobile devices, car audio).
• Streaming and broadcast engineers integrating immersive audio workflows.
• App developers and content creators producing object‑based or scene‑based 3D audio content.
• Test labs and integrators ensuring interoperability and conformance with MPEG‑H 3D audio profiles/levels.

Related standards

• Other parts of the ISO/IEC 23008 series covering high efficiency coding and media delivery (refer to ISO catalog for adjacent parts).
• Industry specifications referencing MPEG‑H formats and metadata practices for immersive audio delivery.

Keywords: ISO/IEC 23008-3:2022, 3D audio, MPEG‑H 3D audio, immersive audio, high efficiency coding, media delivery, object metadata, dynamic range control, SAOC 3D, HOA rendering.