Candidate Standards

A Candidate Standard is a document that 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.


A/323: ATSC Candidate Standard: Dedicated Return Channel for ATSC 3.0

Approved 2 November 2017. The CS period ends 31 January 2018.

This document describes a Dedicated Return Channel (DRC) system for the ATSC 3.0 next generation broadcast standard. Both the physical layer and Media Access Control (MAC) layer specifications are detailed.

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ATSC Candidate Standard: A/341 Amendment – Picture Timing Information

Approved 6 November 2017. Updated 15 December 2017. The CS period ends on 31 January 2018.

This document describes constraints on HEVC streams redistributed to viewers over MVPD systems in regards to carriage of HEVC Picture Timing SEI messages as documented in ANSI/SCTE 215-1 “HEVC Video Constraints for Cable Television Part 1-Coding”. If approved by the ATSC, A/341:2017, “Video-HECV”, would be amended according to the edits described herein. A redline is […]

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ATSC Proposed Standard: A/341 Amendment – SL-HDR1

Approved 26 December 2017. This document is currently at ballot as a Proposed Standard.

This document describes constraints and usage of ETSI TS 103 433 (SL-HDR1) SEI messages for enabling delivery of SDR-to-HDR dynamic SEI messages along with an SDR stream in ATSC 3.0 video services. If approved by the ATSC, A/341:2017, “Video–HEVC,” would be amended according to the edits described herein.

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