ATSC 3.0 : Candidate Standards
A Candidate Standard has received significant review within a Specialist Group. Advancement of a document to Candidate Standard is an explicit call to those outside of the related Specialist Group for implementation and technical feedback. This is the phase at which the Specialist Group is responsible for formally acquiring that experience or at least defining the expectations of implementation.
Documents are provided in the links below in the Acrobat (PDF) format.
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A/341:2019 Amendment No. 2, ST 2094-40Most Recent Document Approved: 31 March 2021
This amendment clarifies the term “access unit” and identifies a CMAF Media Profile for ST 2094-10. It also standardizes the emission of dynamic metadata based on SMPTE ST 2094-40:2020 “Dynamic Metadata for Color Volume Transform — Application #4” (henceforth, identified as “ST 2094-40”) in the ATSC 3.0 system as specified by CTA-861-H. Some editorial items are also improved.
Download A/341:2019 Amendment No. 2, “Candidate Standard – 2094-40”, approved 31 March 2021. The Candidate Standard period extend until 31 July 2021.
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A/344:2021 Candidate Standard RevisionMost Recent Document Approved: 14 June 2021
This document describes the interactive content environment provided by an ATSC 3.0 receiver. This environment is comprised of a standard W3C User Agent with known characteristics, a WebSocket interface for obtaining information from the receiver and controlling various receiver functionality, and an HTTP interface for accessing files delivered over broadcast. This document also specifies the life cycle of the interactive content when delivered over broadband or broadcast or both.
Download ATSC Candidate Standard: “Revision of A/344:2021, ATSC 3.0 Interactive Content”, and accompanying schema, approved 14 June 2021. The Candidate Standard period extends until 30 November 2021. The following additional documents are provided:
Word redline showing changes relative to A/344:2021 as published.
A change log summarizing the changes contained in this revision.
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A/360:2019 Amendment No. 3, cbcsMost Recent Document Approved: 15 June 2021
This document adds the CENC encryption mode ‘cbcs’ to the allowable content encryption methods. The current A/360 text references a no-longer-current version of the CENC standard, and only allows use of two encryption modes: CTR (‘cenc’) and CBC (‘cbc1’). There is significant interest in allowing the use of CBCS (‘cbcs’) – which is a likely mode common to most services (ATSC and otherwise).
Download ATSC Candidate Standard: “A/360:2019 Amendment No. 3, cbcs”, approved 15 June 2021. The Candidate Standard period extends until 31 December 2021.
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