Technology Group 3

Scope of TG3

The ATSC Technology Group 3 (TG3), with due regard for existing standards organizations and activities, develops and maintains voluntary, international technical Standards, Recommended Practices and other documents for the distribution of television programs and other data using advanced terrestrial broadcast technology, Internet and other transports. Technologies considered may be improvements to current systems or entirely new systems that are compatible or incompatible with current systems. As appropriate, TG3 may engage in activities to address implementation issues regarding ATSC Standards and other documents.


TG3: Chair – Madeleine Noland, LG

Madeleine Noland began her television career with Backchannelmedia (BCM) in 2004. BCM created Clickable TV®, an end-to-end interactive television system for local broadcast stations based on EBIF technology.
She then became the ATSC member rep for BCM. After BCM, she moved onto Telvue, successfully guiding the company to consensus on its product roadmap and acting as “product owner” in an agile development process. She continued her participation in ATSC as a member rep for Telvue. Noland joined LG in 2013 and will become the ATSC TG3 Chair in May, 2018.Noland is the recipient of the 2016 ATSC Bernard J Lechner Outstanding Contributor Award.

TG3 Specialist Groups

TG3/S31: System Requirements and Program Management

Chair: Skip Pizzi, NAB
Vice-Chair: Ms. Madeleine Noland, Zenith Electronics LLC


The Specialist Group on ATSC 3.0 System Requirements and Program Management (called TG3/S31) will solicit use cases and develop scenarios, and examine them within various industry contexts for the next-generation digital television broadcast system (ATSC 3.0). These scenarios will be used to derive a set of System Requirements and the associated Glossary for ATSC 3.0, which will in turn enable the development of Technical Standards and Recommended Practices for such future service by TG3 and its other subgroups. The group will manage the ongoing development and documentation of these System Requirements and Glossary as appropriate over time.

The group will assist in the review, coordination and consolidation of work within TG3’s subgroups, including reviewing subgroup output for adherence to the System Requirements, coordinating interdependent deliverables and timelines, assisting in identifying and resolving work overlaps or gaps between groups, drafting outlines and shared sections of documents requiring multiple subgroup input, and other similar tasks as assigned by TG3.


The Specialist Group on System Requirements and Program Management, TG3/S31, has developed Requirements for the ATSC 3.0 system, based on its solicitation and collection of use cases for a next-generation television system from around the world the group, and extraction of 13 “Usage Scenarios” describing the desired attributes of the ATSC 3.0 system. From these scenarios the group developed an initial set of System Requirements that TG3 assigned to various other Specialist Groups as guidance for the drafting of language for the ATSC 3.0 standard.

The group has moved into a maintenance mode on this front, where additional Requirements are no longer actively solicited. Reevaluation of existing Requirements may still be considered should adequate cause to do so be presented.

The group has also engaged in other activities regarding prioritization and the coordination of Requirements’ fulfillment by other Specialist Groups in TG3, as well as drafting of the overall “System Standard” (A/300) for ATSC 3.0.


TG3/S32: Specialist Group on Physical Layer for ATSC 3.0

Chair: Luke Fay, Sony
Vice-Chair: Mr. William Hayes, IEEE — Broadcast Technology Society


The Specialist Group on Physical Layer for ATSC 3.0 (called TG3/S32) will examine, assess, and possibly recommend technical proposal(s) for the physical layer(s) of the next generation digital terrestrial television broadcast system (ATSC 3.0). Interoperability with non-broadcast distribution systems (both traditional and non-traditional) will be considered. The term “television” should not in any way constrain the Specialist Group from considering physical layer technologies, systems and services that may currently fall outside the traditionally defined boundaries of television broadcasting.


The Specialist Group on Physical Layer for ATSC 3.0, TG3/S32, has delivered A/321 “System Discovery and Signaling” and A/322 “Physical Layer Protocol” specifications in 2016.  There have been three Plug Fests where functional verification of the standards was conducted with many participants of modulator and demodulator prototypes. Each one was successful in demonstrating mandatory modes of the physical layer.

As depicted in the physical layer architecture, the scheduler and interface to the middle layer of ATSC 3.0 requires description.  A/324 “Studio to Transmitter Link” was drafted to fulfill this need and is now a Candidate Standard.  A Plug Fest is planned in early 2017 to functionally verify operation of prototype studio to transmitter equipment from many vendors.

A dedicated return link standard is a work in progress.  Now that the physical layer downlink is defined, the required links for the return channel can now be finalized.

Recommended Practices are being written for testing the physical layer.  These are open for any organization to use and ATSC hopes that results can be shared with S32 to complete the full picture of what the ATSC 3.0 Physical Layer can achieve.

TG3/S33: Specialist Group on Management and Protocols

Chair: Dr. Youngkwon Lim, Samsung Electronics America, Inc.
Vice-Chair: Mr. Charles Lo, Qualcomm, Inc.
Vice-Chair: Ralf Schaefer, Technicolor


The Specialist Group on Management and Protocols (called TG3/S33) will solicit, examine and assess technical proposals and develop Standards and Recommended Practices related to technologies for the management and delivery of ATSC 3.0 services and associated metadata, over terrestrial broadcast channels and, if appropriate, broadband/bi-directional networks, to fulfill the relevant ATSC 3.0 System Requirements.


The Specialist Group on Management & Protocols, TG3/S33, was formed to primarily focus on technologies for the management and delivery of ATSC 3.0 services and associated metadata. S33 has formed three ad hoc groups. The first ad-hoc group (S33-1) is working on service delivery and synchronization while the second ad-hoc group (S33-2) is working on service announcement and personalization. The third ad-hoc group (S33-3) is working on interactive services, companion screen services, and redistribution support. S33 and each of its ad-hoc groups has delivered several standards, A/330 “Link-Layer Protocol,” A/332 “Service Announcement,” A/333 “Service Usage Reporting,” A/334 “Audio Watermark Emission,” A/335 “Video Watermark Emission,” A/336 “Content Recovery in Redistribution Scenario,” and A/338 “Companion Device.” S33-1 is currently finalizing a standard on delivery, synchronization and Forward Error Correction (FEC) utilizing Dynamic Adaptive Streaming over HTTP (DASH), MPEG Media Transport (MMT) and Real-Time Object Delivery over Unidirectional Transport (ROUTE) protocol. S33-3 is also finalizing a standard on interactive application signaling.

TG3/S34: Specialist Group on Applications and Presentation for ATSC 3.0

Chair: Chris Homer, PBS


The Specialist Group on Presentation for ATSC 3.0 (called TG3/S34) will examine and assess technical proposals and develop Standards and Recommended Practices for presentation of the next generation digital terrestrial television broadcast system to fulfill the relevant ATSC 3.0 System Requirements. The Specialist Group will primarily focus on the portion of the ATSC 3.0 platform that defines the user experience. The work may include, but is not limited to, content essence (video, audio, captions), formats, support for audio and video codec systems, linear TV services, accessibility (including video description and closed captions) and other features as defined by evolving system requirements across a multi-path delivery, multi-device ecosystem.


The Specialist Group on Applications & Presentation, TG3/S34, was formed to focus on the portion of the ATSC 3.0 platform that defines the user experience. S34 formed five ad hoc groups whose tasks are roughly divided as follows: video, audio, conceptual model/framework, interactivity, and accessibility. The video group responsible for defining video formats including interlace/progressive scan, frame rate, spatial resolution, dynamic range, color gamut, layering technologies (e.g., SHVC) etc. has completed their work, A/341, with the exception of documenting 2094-40 which is currently in Candidate Standard. They may look at advanced video codecs in the future. The audio group selected two systems, AC-4 and MPEG-H, A/342 Parts 1-3, and will be working on an audio Recommended Practice shortly. The conceptual model/framework group completed their work which is now part of A/300 Annex C. The accessibility group has completed a standard for Closed Captions, A/343, using technologies based on IMSC1 and will continue their work in S34, such as drafting a Recommended Practice on Closed Captions. The interactivity group has moved to Specialist Group S38 and is documenting a system based on W3C technologies. S34 continues working closely with other ATSC 3.0 groups to ensure its work plan conforms to the overall ATSC 3.0 target schedule, to the extent possible.

TG3/S35: Specialist Group on ATSC 3.0 Ecosystem

Chair: S. Merrill Weiss, Merrill Weiss Group
Vice-Chair: Peter Sockett, WRAL-HD


The TG3/S35 Specialist Group on the ATSC 3.0 Ecosystem will model and evaluate the environment in which ATSC 3.0 systems will be deployed. The processes of modeling and evaluation will consider the flow of content from acquisition through post production, distribution, emission, and redistribution. The Specialist Group will examine each of the types of content and functionality impacting on a fully operational ATSC 3.0 broadcast system. The examination will include such layers as video, audio, captioning, interactivity, program and service management and announcements (including emergency alerting), content identification, security, synchronization, monitoring, and redistribution by other delivery methods. The models developed will include at least block diagrams that cover the typical content and data workflows that will feed into and be associated with ATSC 3.0 emissions. This work will be published to facilitate decisions made by other ATSC Specialist Groups and to instigate development of standards by ATSC and/or other standards development organizations when gaps in required standards are found.

TG3/S36: Specialist Group on ATSC 3.0 Security

Chair: Adam Goldberg, AGP LLC
Vice-chair: Chris Homer, Gian Solutions



The TG3/S36 Specialist Group on the ATSC 3.0 Security will develop standards and other documents that describe the security and conditional access infrastructure of the ATSC 3.0 system, including mechanisms for supporting conditional access features like pay-per-view and subscription services. This also includes mechanisms for cryptographically protecting communications within the ATSC 3.0 system and cryptographic verification of downloaded applications.


TG3/S36 is examining the requirements for security and existing standards for meeting those requirements. It is anticipated that some existing standards may be used as a basis for the ATSC 3.0 security standard.

TG3/S37: Specialist Group on Conversion and Redistribution of ATSC 3.0 Service

Chair: Steve Calzone
Vice-Chair: Jeff Hamilton, Hamilton Technologies


ATSC TG3/S37 develops and maintains Recommended Practices, Standards, and other documents relating to the conversion and redistribution of ATSC 3.0 services.

TG3/S38: Specialist Group on Interactive Environment

Chair: Mark Corl, Triveni Digital
Vice-Chair: Luke Fay, Sony


Scope under development.

TG3/S39: Specialist Group on ATSC 1.0

Chair: Michael Dolan
Vice-Chair: Mark Corl, Triveni Digital


The Specialist Group on ATSC 1.0 scope is under review.


TG3/S39 is currently (January 2019) working on a standard to assist in the frequency “repack” by announcing over ATSC “1.0” the channel frequency transitions and timing.  This is called the Regional Service Availability Table (RSAT) and its Candidate Standard draft is here.