Digital TV Group

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IndustryDigital TV, technology, television, standards
HeadquartersLondon, United Kingdom,
Vauxhall, London, England
Area served
UK, Australia, New Zealand, South Africa, Ghana and Europe
Key people
  • David Docherty (Chairman)
  • Richard Lindsay-Davies (CEO)
DTG - The centre of UK digital TV

The DTG (Digital TV Group) is the association for British digital television broadcasters and annually publish and maintain the technical specifications for digital terrestrial television (DTT) in the United Kingdom, which is known as the D-Book[1] and is used by Freeview, Freeview HD, FreeSat and YouView. The association consists of over 120 UK and international members[2] who can participate in DTG activities to varying degrees, depending on their category of membership.


The DTG is the UK's centre for digital media technology. Since 1995, it has been vital to the distribution of TV in the UK – digital TV, interactive TV, the digital TV switchover, on-demand TV, HDTV and UHD TV. The DTG supports the development of pay-TV and other platforms.


The DTG was formed in 1995 by the BBC, BSkyB, BT Group, Channel 4, ITV, NTL Incorporated, Pace and Sony to set technical standards for the implementation of digital terrestrial television in the UK.

From these initial eight members, the DTG has grown to include over 120 UK and international members and played an important role in the success of the UK television industry.[3]

Current work[edit]

The DTG, working with its members, has identified six priority television technologies. These are:

  • Ultra high definition: working through the DTG UK UHD Forum.[4]
  • Digital terrestrial television: maintenance of the technical specification (D-Book).[5]
  • Video-to-mobile: improving the delivery and consumer experience of streaming video on portable devices using mobile data.[6]
  • Spectrum: driving full value by managing change/coexistence through supporting the introduction of new services.[7]
  • Connected TV: developing industry-wide ad insertion and home-networking solutions.[8]
  • Accessibility: improving the experience of TV for viewers with accessibility requirements.[9]


The DTG is a membership association with four categories of membership:[10]

  1. Full Member for organisations who are active in the UK market.
  2. New Entrant for new organisations in their first two years of operation.
  3. World Member for organisations who are interested in, but not active, in the UK market.
  4. Affiliate Member for charities, governments and regulators with an interest in the UK market and/or technical aspects of the television industry.

DTG Testing[edit]

DTG Testing - Orange with Icon

DTG Testing is a vital resource for the TV and IP industries and a trusted partner to the regulators. The team works to maintain standards across digital TV platforms. Each year DTG technicians produce real-world test reports, white papers, practice guidelines and the D-Book, a list of specifications for UK digital TV. The Zoo at DTG Testing is the UK's only comprehensive testing and accreditation centre for digital TV devices and services.

The DTG owns and operates DTG Testing, an ISO 17025 accredited test laboratory in Central London.[11] DTG Testing ensures that digital television products in the United Kingdom conform to the D-Book specification[12] – a requirement of obtaining the Freeview trade mark licence.[13]

DTG Testing also provide access to:

  • the UK's over-air download channel[14]
  • a receiver collection (The Zoo[15]) representing 95% of the UK's deployed free-to-air receivers
  • the Test and Innovation Centre,[16] incorporating the UK's largest commercial GTEM Cell.[17]
  • Consultancy[18]
  • Training[19]

The D-Book[edit]

The DTG has published the D-Book since 1996, updating the specification annually to keep apace of the development of UK DTT. The D-Book defines the DTT platforms in the UK and provides requirements for interoperability. Based on international standards it is produced by a collaborative approach of industry experts. Where appropriate it delivers harmonisation with other international bodies, enabling manufacturers and service providers to deliver products to market.

The DTGs D-Book 10, published November 2017, provides support on the development of HD products and services, with the introduction of Single Frequency Network (SFN) support for the migration of COM 7&8 DVB-T2 multiplexes into the 700 MHz band. Also included is an IP Software Upgrade Option in response to the requirements of manufacturers handling software upgrades to today's complex TVs, which avoids the need for SSU Broadcast updates.

D-Book 10 covers a range of new topics and continues to support all UK DTT-based platforms including Freeview Play, Freeview HD, YouView, EETV, Now TV and the UK DSAT platform, Freesat, as well as several international adaptations. DTT delivers to the largest viewing audience.

The industry's not-for-profit test centre, DTG Testing, continues to offer conformance tests and testing services in support of Freeview HD, and Freeview Play and HbbTV. and D-Book 10 Conformance Tests will be available in April 2018.

See also[edit]


  1. ^ "What is the D-Book?". Digital TV Group, Technical, DTT. 12 August 2014. Retrieved 12 August 2014.
  2. ^ "Current DTG Members". Digital TV Group membership website. 12 August 2014. Retrieved 12 August 2014.
  3. ^ Vaizey, Ed (20 May 2014). "Ed Vaizey Speech to Digital TV Group Summit 2014". Ed Vaizey MP announcements. Department for Culture, Media & Sport and Ed Vaizey MP. Retrieved 12 August 2014.
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  11. ^ "Home | DTG Testing". Retrieved 7 March 2018.
  12. ^ "Conformance product testing | DTG Testing". Retrieved 7 March 2018.
  13. ^ "Obtain Freeview logos | DTG Testing". Retrieved 7 March 2018.
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  17. ^ "GTEM Cell Hire | DTG Testing". Retrieved 7 March 2018.
  18. ^
  19. ^ "DTG Testing Training | DTG Testing". Retrieved 7 March 2018.

External links[edit]