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A/334, “Audio Watermark Emission”Approved: 17 July 2025

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

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.

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.

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

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

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

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ATSC, the Broadcast Standards Association, is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. Serving as an essential force in the broadcasting industry, ATSC guides the seamless integration of broadcast and telecom standards to drive the industry forward. Currently, the ATSC 3.0 Standard is providing the best possible solution for expanding the potential of the broadcast spectrum beyond its traditional application to meet changing needs. From conventional television to innovative digital data services, ATSC has one clear goal: to empower the broadcasting ecosystem like never before.

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