This document standardizes the AC-4 audio system for use in the ATSC 3.0 Digital Television System. It describes the characteristics of the AC-4 audio system and establishes a set of constraints on ETSI TS 103 190-2 for use within ATSC 3.0 broadcast emissions. The ATSC 3.0 audio system provides an enhanced feature set and improves upon the capabilities of past ATSC audio systems. The system provides listeners with both a personalized and an immersive experience. The ATSC 3.0 audio system establishes a common framework for multiple Next Generation Audio (NGA) systems, both current and future. The AC-4 audio system is one of the NGA systems standardized in ATSC 3.0.
Download current version: A/342:2022-03 Part 2, “AC-4 System”, published 31 March 2022. This version of the Standard is normatively referenced in A/300:2022-04.
There are multiple versions of this document. Please be sure to download the desired version. For amendments, the text includes a list of changes, the rationale for the changes, and compatibility considerations.
Download A/342:2017 Part 2, “AC-4 System”, approved 23 February 2017. This version is referenced by A/300:2019 and A/300:2020.
Download A/342:2021 Part 2, “AC-4 System”, approved 10 March 2021. This version is referenced by A/300:2021.
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Advanced Television Systems Committee, Inc.
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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.