ISO IEC 23091-3-2018 amd1-2022 PDF

Full title and description

ISO/IEC 23091-3:2018/Amd 1:2022 — Information technology — Coding‑independent code points — Part 3: Audio — Amendment 1: Headphone support. This amendment extends ISO/IEC 23091-3:2018 by adding code points and metadata elements related to headphone rendering and headphone-specific support for coding‑independent audio description.

Abstract

The base document ISO/IEC 23091-3:2018 defines coding‑independent code points (CIP) and fields that describe properties of an audio stream independent of compression encoding and bit rate. Amendment 1 (2022) adds headphone support — i.e., additional code points/fields to convey information useful for headphone rendering or headphone‑specific playback behavior. The amendment is intended to improve interoperability of audio metadata across encoders, decoders and playback devices when headphones are used.

General information

• Status: Published.
• Publication date: 12 April 2022.
• Publisher: ISO/IEC (published as an international amendment to ISO/IEC 23091-3 by ISO in cooperation with IEC/IEC webstore listings).
• ICS / categories: 35.040.40 (Coding of audio, video, multimedia and hypermedia information).
• Edition / version: Edition 1 (ISO/IEC 23091-3:2018) with Amendment 1 issued 2022 (ISO/IEC 23091-3:2018/Amd 1:2022).
• Number of pages: 10 (amendment document length).

Scope

This amendment applies to ISO/IEC 23091-3:2018 and introduces headphone‑specific code points and metadata to describe audio properties and rendering guidance for headphone playback. The overall series defines code points that convey interpretation and characteristics of audio streams independent of encoding and bit rate; the amendment focuses on ensuring interoperable headphone support across devices and content workflows.

Key topics and requirements

• Definition and registration of coding‑independent code points (CIP) for audio stream properties (channel configuration, signal type, etc.).
• Addition of headphone support code points and associated metadata fields to signal headphone rendering expectations or parameters.
• Guidance to ensure metadata is encoder/decoder‑agnostic so playback devices (including headphone-equipped endpoints) can interpret and apply headphone‑specific rendering.
• Backwards compatibility with ISO/IEC 23091‑3:2018 — amendment augments the existing code point registry rather than replacing the base standard.
• Intended interoperability across content production, distribution and playback ecosystems (streaming services, device manufacturers, authoring tools).

Typical use and users

Primary users include audio codec and metadata implementers, device and headset manufacturers, streaming and broadcast system designers, content creators and post‑production tool vendors. The amendment is used to convey headphone rendering intent or parameters in metadata so that renderers and playback devices can provide consistent headphone playback.

Related standards

Part of the ISO/IEC 23091 series of coding‑independent code points. Closely related documents include ISO/IEC 23091‑1 (Systems), ISO/IEC 23091‑2 (Video), and ISO/IEC TR 23091‑4 (usage guidance for video signal type code points). Implementers should consider the other parts of the 23091 series when integrating audio code points into broader systems and workflows.

Keywords

Coding‑independent code points, CIP, audio metadata, headphone support, ISO/IEC 23091, audio interoperability, headphone rendering, metadata fields, audio stream properties.

FAQ

Q: What is this standard?

A: It is ISO/IEC 23091-3:2018 Amendment 1 (2022), an amendment to Part 3 (Audio) of the ISO/IEC 23091 series that adds headphone support code points and metadata elements to the existing audio CIP specification.

Q: What does it cover?

A: The amendment covers additional code points and metadata for headphone‑related audio rendering and playback guidance; the base Part 3 defines coding‑independent descriptors for audio streams so they can be interpreted consistently across encoders, decoders and players.

Q: Who typically uses it?

A: Audio codec developers, device and headset manufacturers, streaming and broadcast engineers, content creators and metadata tool vendors — essentially anyone needing interoperable audio metadata for headphone playback.

Q: Is it current or superseded?

A: The amendment was published and is active (published 12 April 2022) as an official amendment to ISO/IEC 23091-3:2018; it augments rather than supersedes the 2018 base document. Users should check the ISO/IEC catalog for any subsequent revisions to the part or further amendments after 2022.

Q: Is it part of a series?

A: Yes — it is part of the ISO/IEC 23091 series (Coding‑independent code points), which includes Part 1 (Systems), Part 2 (Video), Part 3 (Audio) and related technical reports (e.g., TR 23091‑4).

Q: What are the key keywords?

A: Coding‑independent code points, audio metadata, headphone support, ISO/IEC 23091, interoperability, metadata fields, headphone rendering.