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.


This document specifies information describing the availability of broadcast services over time within a broadcast region. Broadcast receivers may use this information to help construct a list of services that may be available to them. Additionally, the information provides a schedule that allows receivers to maintain an up-to-date service list. This document describes how the […]

Read More Download PDF File Download Zip File

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

Approved 2 November 2017. Updated 30 May 2018. The CS period ends 31 July 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. A redline Word document is available showing changes from the previous version.

Read More Download PDF File

This document specifies the technical mechanisms and procedures pertaining to service signaling and IP-based delivery of a variety of ATSC 3.0 services and contents to ATSC 3.0-capable receivers over broadcast, broadband and hybrid broadcast/broadband networks. The service signaling functionality defines the data formats and information components necessary to discover and acquire user services. The IP-based […]

Read More Download PDF File Download Zip File

ATSC Candidate Standard: A/341 Amendment – 2094-40

Approved 20 February 2018. The CS period ends 30 November 2018.

This document describes technology documented in ST 2094-40 “Dynamic Metadata for Color Volume Transform — Application #4” which is a technology for the use of dynamic metadata for HDR content. If approved by the ATSC, A/341:2018, “Video – HEVC,” (“A/341”) would be amended according to the edits described herein.

Read More Download PDF File

A/344: ATSC Candidate Standard: Revision of ATSC 3.0 Interactive Content

Approved 27 April 2018. The CS period ends 31 July 2018.

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 […]

Read More Download PDF File