Digital TV Group - 1 Nine Elms Lane, Vauxhall, London, UK
T: +44 (0) 207 501 4300 F: +44 (0) 207 501 4399
office@dtg.org.uk
© DTG 2010
UK Digital TV Receiver Recommendations
Version 1.7
May 2010
© DTG 2010 19 May 2010 Page 2 of 34
Table of Contents
0 INTRODUCTION ............................................................................................................................................. 4
1 SD MPEG-2 DVB-T RECEIVER ......................................................................................................................... 5
1.0 INTRODUCTION ................................................................................................................................................. 5
1.1 SERVICES ......................................................................................................................................................... 5
1.1.1 Time-exclusive services ......................................................................................................................... 5
1.1.2 Video and Audio Decoding .................................................................................................................... 5
1.1.3 Subtitles................................................................................................................................................. 5
1.1.4 Audio Description .................................................................................................................................. 5
1.1.5 Active Format Descriptions ................................................................................................................... 5
1.1.6 Service component changes .................................................................................................................. 5
1.2 FRONT END ...................................................................................................................................................... 6
1.3 SERVICE INFORMATION & SELECTION .................................................................................................................... 6
1.3.1 Logical channel numbers ....................................................................................................................... 6
1.3.2 Identification of service changes ........................................................................................................... 7
1.3.3 Basic navigation .................................................................................................................................... 7
1.3.4 Now and Next ....................................................................................................................................... 7
1.3.5 EPG ........................................................................................................................................................ 8
1.3.6 Private descriptor tags .......................................................................................................................... 9
1.3.7 Channel change information ................................................................................................................. 9
1.3.8 Text presentation .................................................................................................................................. 9
1.4 SET-UP AND CONNECTIONS ................................................................................................................................. 9
1.4.1 User documentation.............................................................................................................................. 9
1.4.2 Support package ................................................................................................................................... 9
1.4.3 Diagnostics ............................................................................................................................................ 9
1.4.4 External connections ........................................................................................................................... 10
1.5 USER INPUT CONTROLS .................................................................................................................................... 10
1.5.2 General principles in remote control design ....................................................................................... 10
1.5.3 Recommendations for remote control button labelling ...................................................................... 14
1.5.4 Recorder labelling recommendations ................................................................................................. 18
1.5.5 Recorder Functional Groups ................................................................................................................ 21
1.5.6 Receiver with integrated display labelling recommendations ............................................................ 21
1.6 INTERACTIVITY ................................................................................................................................................ 22
1.6.1 MHEG 5 ............................................................................................................................................... 22
1.7 COMMON INTERFACE ....................................................................................................................................... 22
1.8 MAINTENANCE & UPGRADE ............................................................................................................................... 22
1.8.1 Auto-upgrade of firmware .................................................................................................................. 22
1.9 COMPLIANCE .................................................................................................................................................. 22
1.9.1 Energy efficiency ................................................................................................................................. 22
1.9.2 Other standards and regulations ........................................................................................................ 22
2 SD MPEG-2 DVB-T RECORDER ..................................................................................................................... 23
2.1 SERVICES ....................................................................................................................................................... 23
2.2 FRONT END .................................................................................................................................................... 23
2.3 SERVICE INFORMATION & SELECTION .................................................................................................................. 23
2.3.1 Recording split-events and series events ............................................................................................ 23
2.3.2 Pause live TV ....................................................................................................................................... 23
2.3.3 One touch recording (OTR).................................................................................................................. 23
2.3.4 Selection from EPG .............................................................................................................................. 24
2.3.5 Scheduled Recordings Display ............................................................................................................. 24
2.3.6 Recommendations .............................................................................................................................. 24
2.3.7 Tracking schedule changes ................................................................................................................. 24
2.3.8 Modification of the recording schedule .............................................................................................. 24
2.3.9 Accuracy of recording ......................................................................................................................... 25
2.3.10 Conflict resolution ............................................................................................................................. 25
2.3.11 Use of Alternate Instance Information .............................................................................................. 25
2.3.12 Trailer booking .................................................................................................................................. 25
2.3.13 Recording capacity ............................................................................................................................ 25
2.3.14 Runaway recordings .......................................................................................................................... 25
© DTG 2010 19 May 2010 Page 3 of 34
2.3.15 Replay Functions ............................................................................................................................... 26
3 HD AVC DVB-T2 RECEIVER ........................................................................................................................... 27
3.1 SERVICES ....................................................................................................................................................... 27
3.1.1 Video and Audio Decoding .................................................................................................................. 27
3.1.3 Subtitles............................................................................................................................................... 27
3.1.4 Audio Description ................................................................................................................................ 27
3.1.5 Active Format Descriptions ................................................................................................................. 27
3.1.6 User Interface ...................................................................................................................................... 27
3.2 FRONT END .................................................................................................................................................... 28
3.3 SERVICE INFORMATION & SELECTION .................................................................................................................. 28
3.3.1 Logical channel numbers ..................................................................................................................... 28
3.3.2 SD/HD Event Linkage .......................................................................................................................... 28
3.3.3 String compression .............................................................................................................................. 28
3.3.4 Content Management ......................................................................................................................... 28
3.4 CONNECTIONS ................................................................................................................................................ 29
3.4.4 External connections ........................................................................................................................... 29
3.5 INTERACTIVITY ................................................................................................................................................ 30
3.5.1 HD MHEG 5 ......................................................................................................................................... 30
3.5.2 MHEG 5 Interaction Channel ............................................................................................................... 30
3.5.3 Non-destructive tuning ....................................................................................................................... 30
3.5.4 Downloadable fonts ............................................................................................................................ 30
3.6 MAINTENANCE & UPGRADE ............................................................................................................................... 30
4 HD AVC DVB-T2 RECORDER ......................................................................................................................... 31
4.1 SERVICES ....................................................................................................................................................... 31
4.3 SERVICE INFORMATION & SELECTION .................................................................................................................. 31
4.3.1 EPG ...................................................................................................................................................... 31
4.3.2 SD/HD Event Linkage .......................................................................................................................... 31
4.3.3 Guidance ............................................................................................................................................. 31
4.3.4 Trailer booking and recommendations ............................................................................................... 31
4.4 Broadcast Record Lists ........................................................................................................................... 31
4.5 INTERACTIVITY ................................................................................................................................................ 32
4.51 MHEG 5 ................................................................................................................................................ 32
4.6 CONTENT MANAGEMENT .................................................................................................................................. 32
5 REFERENCES ................................................................................................................................................ 33
© DTG 2010 19 May 2010 Page 4 of 34
This chapter is provided as a guide for manufacturers to develop products that will give an acceptable user
experience of UK DTT services. It therefore specifies a set of requirements with which receivers shall comply
when in the receiver‟s DTT mode. These requirements can then be referenced by Freeview as part of their
Trade Mark License (TML) and by the Department of Business Enterprise and Regulatory Reform (BERR) as
part of the Digital Tick TML.
The detailed technical requirements are specified in the DTG D-Book [1].
There are many types of receiver available for use with UK DTT services. For the purposes of this chapter,
the term “receiver” refers to the complete product that the consumer purchases in order to use UK DTT
services. Some examples are:
television receiver
digital video recorder
set top box
portable receiver
PC card and its associated application software
Four classes of receiver are considered in this chapter, each with their own set of requirements. They are:
Standard definition MPEG-2 DVB-T receiver (see Section 1);
Standard definition MPEG-2 DVB-T recorder (see Section 2);
High definition AVC DVB-T2 receiver (see Section 3);
High definition AVC DVB-T2 recorder (see Section 4).
All receivers shall comply with Section 1 whilst additional compliance with the other sections depends upon
the class of receiver. This chapter is applicable when receivers are operating exclusively in a mode where they
can receive services compliant with this document. This means that, for example, multi-function devices are in
their UK DTT mode.
0 Introduction
© DTG 2010 19 May 2010 Page 5 of 34
1.0 Introduction
This section sets out the requirements on receivers that are able to receive and decode SD MPEG-2 services
transmitted on DVB-T multiplexes. Additional requirements for receivers with enhanced capabilities are set
out in following sections.
1.1 Services
Receivers shall be capable of decoding all UK free-to-air DVB-T broadcasts of television, radio and enhanced
services. This shall include the capability to:
present MHEG services (see Section 1.6);
present subtitles (where broadcast) if selected by the viewer (see Section 1.1.3);
handle both widescreen and 4:3 picture and display formats as required (see Section 1.1.5 below).
The support of Audio Description (as defined in Section 1.1.4 below) is recommended.
1.1.1 Time-exclusive services
Some services, called time exclusive services, only broadcast for part of each day and share their multiplex
capacity with other services.
The receiver shall handle the transition between the active and inactive states of a time exclusive service
presenting clean transitions into and out of video, audio and MHEG streams without presentation of any
content or application not intended for the selected service.
1.1.2 Video and Audio Decoding
All receivers shall include MPEG-2 video (ISO/IEC 13818-2 [4]) decoding, as constrained by the ETSI TS 101
154 Specification[3] for the use of Video and Audio Coding in Broadcasting Applications based on the MPEG-2
Transport Stream. As a minimum, the following resolutions (at interlaced 25 frames/s) shall be supported:
720x576, 544x576, 480x576 and 352x576.
All receivers shall include MPEG-2 audio (ISO/IEC 13818-3) [5] decoding, as constrained by ETSI TS 101 154
[3].
1.1.3 Subtitles
All receivers shall be capable of decoding and presenting DVB subtitles in accordance with EN 300 743 [9].
1.1.3.1 Simultaneous display of subtitles and MHEG
Not all receivers are able to present subtitles and MHEG graphics together effectively. Receivers capable of
simultaneously presenting both subtitles and MHEG application graphics shall observe the rules enabling MHEG
applications to suspend presentation of subtitles where editorially required.
1.1.4 Audio Description
Receivers that support audio description shall provide a means of adjusting the relative levels of the main audio
and the audio description channel.
1.1.5 Active Format Descriptions
Active format descriptions (AFDs) as defined in ETSI TS 101 154 [3] are broadcast to describe the portion of
the 16:9 or 4:3 coded frame that is “of interest”. Receivers shall be able to present the video for the type of
display in use according to the AFDs transmitted.
Receivers shall comply with the mandatory requirements set out in Chapter 24. If the user has selected HDMI
as the primary output, any other outputs may follow the HDMI video format with appropriate signalling.
1.1.6 Service component changes
Receivers shall continually monitor the PSI (PAT and PMT) for changes and act accordingly
1 SD MPEG-2 DVB-T Receiver
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