SIST ETS 300 472 E1:2005

• Abstract:

  Method by which ITU-R System B Teletext, also known as World System Teletext (WST), may be carried in DVB bitstreams. This transport mechanism is intended to satisfy the following requirements: 1. Support the transcoding of Teletext data into the Vertical Blanking Interval (VBI) of analogue video, compatible with existing TV receivers with Teletext decoders. 2. Maximum data rate for each Teletext service is equivalent to 16 lines per field so that the service is always suitable for transcoding into the VBI. 3. Transmission mechanism capable of transmitting subtitles with accurate timing with respect to the video, i.e. within or near frame accuracy. A more general data transport mechanism for conveying new types of data services is outside the scope of this document, but the transport syntax specified here can also be adapted for other data.

• Status: Published
• Publication Date: 31-Oct-2005
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-2005
• Due Date: 01-Nov-2005
• Completion Date: 01-Nov-2005
• Mandate: T-304
• Ref Project: ETSI ETS 300 472 ed.1 (1994-12) - Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams

Overview

SIST ETS 300 472 E1:2005 establishes the standardized method for conveying ITU-R System B Teletext-also known as World System Teletext (WST) or EBU Teletext-within Digital Video Broadcasting (DVB) bitstreams. Developed by the Slovenski inštitut za standardizacijo (SIST) in alignment with European Broadcasting Union (EBU) and the European Telecommunications Standards Institute (ETSI), this standard ensures compatibility between digital broadcast systems and teletext features widely used in analog television.

The primary focus is on the reliable transport of teletext data, particularly subtitles and information pages, through DVB multiplexes in a way that maintains compatibility with existing TV receivers and supports transcoding into the Vertical Blanking Interval (VBI) of analog video signals.

Key Topics

• Conveyance of ITU-R System B Teletext in DVB: Defines mechanisms for the carriage of EBU Teletext in digital MPEG-2 transport streams so that the data can be later transcoded into the analog VBI.
• Data Rate Limitation: Ensures that each teletext service in the stream transmits at a maximum rate equivalent to 16 lines per video field, thereby guaranteeing ongoing compatibility for transcoding into the VBI.
• Accurate Subtitle Synchronization: Outlines requirements for subtitle transmission, delivering near frame-accurate timing in relation to the associated video content, which is crucial for accessibility and viewer experience.
• Packet Structure: Specifies the encapsulation of teletext data as Packetized Elementary Stream (PES) packets, carried within MPEG-2 Transport Stream packets, with identification parameters for teletext streams and descriptors.
• Teletext Decoder Model: Includes conceptual guidelines so that the DVB bitstream structure meets the demands of compliant teletext decoders, ensuring smooth extraction and presentation of teletext data.

Applications

Broadcasting and Media Distribution

• Digital Television: Operators and broadcasters can continue to provide teletext services-such as information pages, news, and subtitles-within DVB-based digital TV services, preserving features familiar to analog TV audiences.
• Subtitles and Accessibility: Ensures robust delivery of subtitles, supporting accessibility for hearing-impaired viewers and multilingual broadcasting.
• Analog-to-Digital Transition: Facilitates a seamless migration of teletext data from traditional analog VBI methods to digital platforms, maintaining legacy service continuity and receiver compatibility.

Equipment and Software Development

• TV Receiver Manufacturers: Provides technical specifications for the handling, decoding, and possible transcoding of teletext data in digital TV receivers and set-top boxes.
• Broadcast Playout Systems: Assists developers in implementing DVB multiplexers and playout solutions capable of properly signaling and multiplexing teletext streams, enabling enhanced interactivity and information services.

Related Standards

• ISO/IEC 13818-1:1994 (MPEG-2 Systems): Underpins the transport stream structure used to convey teletext and other private data within DVB.
• ETS 300 468: Specifies Service Information (SI) for DVB systems, including descriptors necessary for identifying teletext and other data types in the Program Map Table.
• ITU-R BT.653: Defines System B (625/50) teletext specifications for 625-line analog television systems.
• EBU SPB 492: Details the technical specifications of EBU Teletext for 625-line television, closely referenced in transcoding scenarios.

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By utilizing the guidance in SIST ETS 300 472 E1:2005, broadcasters and equipment manufacturers ensure continued access to reliable and interoperable teletext services in the digital age, meeting both current user needs and the technical demands of modern DVB platforms. For engineers and technical implementers, this standard is an essential reference for bridging the gap between legacy analog teletext and today's digital broadcasting workflows.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sistemi digitalne radiodifuzije za televizijske, zvokovne in podatkovne storitve – Specifikacije za prenos teleteksta po standardu ITU-R sistem B v bitnih tokih digitalne videoradiodifuzije (DVB)Digital broadcasting systems for television, sound and data services – Specification for conveying ITU-R System B teletext in digital video broadcasting (DVB) bitstreams33.170Televizijska in radijska difuzijaTelevision and radio broadcastingICS:Ta slovenski standard je istoveten z:ETS 300 472 Edition 1SIST ETS 300 472 E1:2005en01-november-2005SIST ETS 300 472 E1:2005SLOVENSKI
STANDARD
EUROPEANETS 300 472TELECOMMUNICATIONMay 1995STANDARDSource: EBU/ETSI JTCReference: DE/JTC-DVB-4-1ICS:33.160.20, 33.060.140Key words:Broadcasting, digital, MPEG, teletext, TVEBUUEREuropean Broadcasting UnionUnion Européenne de Radio-TélévisionDigital broadcasting systems for television,sound and data services;Specification for conveying ITU-R System B Teletext inDigital Video Broadcasting (DVB) bitstreamsETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1995. All rights reserved.© European Broadcasting Union 1995. . All rights reserved.SIST ETS 300 472 E1:2005

Page 2ETS 300 472: May 1995Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 472 E1:2005

Page 3ETS 300 472: May 1995ContentsForeword.51Scope.72Normative references.73Definitions and abbreviations.73.1Definitions.73.2Abbreviations.84Insertion of teletext into the MPEG-2 transport multiplex.84.1Transport Stream packet format.84.2PES packet format.84.3Syntax for PES data field.94.4Semantics for PES data field.95Teletext decoder model.10History.12SIST ETS 300 472 E1:2005

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Page 5ETS 300 472: May 1995ForewordThis European Telecommunication Standard (ETS) has been produced under the authority of the JointTechnical Committee (JTC) of the European Broadcasting Union (EBU) and the EuropeanTelecommunications Standards Institute (ETSI).This version of the specification for conveying ITU-R System B Teletext in Digital Video Broadcasting(DVB) systems has been produced from the DVB Steering Board draft TM 1241 Rev.1.NOTE:The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of ETSs in thespecific field of radio, television and data broadcasting. The EBU is a professionalassociation of broadcasting organisations whose work includes the co-ordination of itsMembers' activities in the technical, legal, programme-making andprogramme-exchange domains. The EBU has Active Members in about 50 countriesin the European Broadcasting Area; its headquarters is in Geneva *.*European Broadcasting UnionCase Postale 67CH-1218 GRAND SACONNEX (Geneva)SwitzerlandTel:[phone]Fax:[phone]Transposition datesDate of latest announcement of this ETS (doa):31 August 1995Date of latest publication of new National Standardor endorsement of this ETS (dop/e):29 February 1996Date of withdrawal of any conflicting National Standard (dow):29 February 1996SIST ETS 300 472 E1:2005

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Page 7ETS 300 472: May 19951ScopeThis ETS specifies the method by which ITU-R System B Teletext [3], also known as EBU Teletext [4],may be carried in DVB bitstreams. This transport mechanism is intended to satisfy the followingrequirements:-to support the transcoding of the teletext data into the Vertical Blanking Interval (VBI) of analoguevideo. The transcoded signal should be compatible with existing TV receivers with teletextdecoders;-the maximum data rate for each teletext service is equivalent to 16 lines per field so that the serviceis always suitable for transcoding into the VBI;-the transmission mechanism should be capable of transmitting subtitles with accurate timing withrespect to the video (i.e. to within or near frame accuracy).A more general data transport mechanism for conveying new types of data services is outside the scopeof this ETS, but the transport syntax specified here can also be adapted for other data.2Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ISO/IEC 13818-1 (1994): "Information Technology - Generic Coding of MovingPictures and Associated Audio Recommendation H.222.0 (systems)".[2]ETS 300 468: "Digital broadcasting systems for television, sound and dataservices; Specification for Service Information (SI) in Digital Video Broadcasting(DVB) systems".[3]ITU-R Recommendation 653: "System B, 625/50 television systems".[4]EBU SPB 492 (1992): "Teletext specification (625 line television systems)".3Definitions and abbreviations3.1DefinitionsFor the purposes of this ETS, the following definitions apply.MPEG-2: Refers to the standard ISO/IEC 13818 [1]. Systems coding is defined in part 1. Video coding isdefined in part 2. Audio coding is defined in part 3.section: A section is a syntactic structure used for mapping all service information defined inETS 300 468 [2] into ISO/IEC 13818 [1] Transport Stream packets.service: A sequence of programmes under the control of a broadcaster which can be broadcast as part ofa schedule.teletext descriptor: See ETS 300 468 [2], it is used in the Program Specific I
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