A/334, “Audio Watermark Emission”Approved: 14 April 2026

This document specifies the VP1 audio watermark for use with systems conforming to the ATSC 3.0 family of specifications. The document specifies the format in which the audio watermark resides in a PCM audio signal. Emission by a broadcaster of the audio watermark is optional.

Download current version: A/334:2026-04, “Audio Watermark Emission”, 14 April 2026. This version of the Standard is normatively referenced in A/300:2026-04.

Previous Versions

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. The following documents are listed by date, with the most recent first.

2025

Download A/334:2025-07, “Audio Watermark Emission”, 17 July 2025. This version of the Standard is normatively referenced in A/300:2025-07.

2024

Download A/334:2024-04, “Audio Watermark Emission”, 3 April 2024. This version of the Standard is normatively referenced in A/300:2024-04.

2023

Download A/334:2023-03, “Audio Watermark Emission”, 28 March 2023. This version of the Standard is normatively referenced in A/300:2023-03.

2022

Download A/334:2022-03, “Audio Watermark Emission”, 31 March 2022. This version of the Standard is normatively referenced in A/300:2022-04.

2016

Download A/334:2016, “Audio Watermark Emission”, approved 19 September 2016. This version of the Standard is normatively referenced in A/330:2019, A/300:2020, and A/300:2021.