SIST EN 300 472 V1.2.2:2005
(Main)Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams
- Abstract
This version contains changes of an entirely editorial nature as follows: 1)add the DVB logo to the front page of the deliverable; 2)change the title from: Digital broadcasting systems for television, sound and data services;etc. to Digital Video Broadcast (DVB);etc.; 3)add in the foreword the DVB acknowledgement.
- Status
- Published
- Publication Date
- 31-Oct-2005
- 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
SIST EN 300 472 V1.2.2:2005 is the Slovenian adoption of EN 300 472 Version 1.2.2, a European standard from ETSI for conveying ITU-R System B Teletext, also known as EBU Teletext, in DVB bitstreams. It specifies how Teletext is mapped into MPEG-2 transport streams and how the packet structure and timing support both direct decoding and transcoding to the vertical blanking interval (VBI).
What does SIST EN 300 472 V1.2.2:2005 specify?
SIST EN 300 472 V1.2.2:2005 specifies the method for carrying ITU-R System B Teletext in DVB bitstreams. In practice, it tells broadcasters and receiver designers how to signal Teletext, packetize it, and preserve the timing needed for subtitles and VBI transcoding.
The document is organized into clauses 1 to 5:
- scope
- normative references
- definitions and abbreviations
- insertion of Teletext into the MPEG-2 transport multiplex
- Teletext decoder model
Clause 1 limits the scope to Teletext carriage and notes that a more general data transport mechanism is outside the document’s purpose.
What are the key requirements of SIST EN 300 472 V1.2.2:2005?
Transport mapping
SIST EN 300 472 V1.2.2:2005 carries Teletext data in Packetized Elementary Stream (PES) packets, which are then carried in Transport Stream (TS) packets. The Packet Identifier (PID) for a Teletext stream is signaled in the Program Map Table (PMT) of the Program Specific Information (PSI), and the Teletext descriptor in EN 300 468 identifies the stream.
This matters because the receiver uses the PMT and descriptor to find the right stream and to treat it as Teletext rather than generic private data.
A service may carry more than one Teletext data stream if each stream uses a different data_identifier and can be distinguished by its Teletext descriptor.
Packet and syntax rules
SIST EN 300 472 V1.2.2:2005 restricts TS packet handling and PES formatting so that Teletext packets align cleanly with TS boundaries and decoder timing. The TS adaptation_field_control is limited to the values “01” and “10”, and the PES stream_id is set to private_stream_1.
For PES packets, the document fixes the header structure, including a data_alignment_indicator of 1 and a fixed PES_header_data_length. In practice, this gives a predictable packet format for multiplexing and decoding.
The PES data field has its own syntax: a data_identifier followed by repeated data_unit_id, data_unit_length and data_field elements. For EBU Teletext data, the data_unit_length is fixed, and only the permitted data_unit_id and line_offset values may be used in streams identified by the DVB Teletext descriptor.
Timing and decoder model
SIST EN 300 472 V1.2.2:2005 defines a conceptual Teletext decoder model that the bitstream must satisfy. A Teletext access unit is one Teletext data packet, and Presentation Time Stamp (PTS) timing applies to the first access unit after the PTS field.
The model uses two buffers, gives a transfer rate between them, and limits how long data may remain in the larger buffer. This matters for implementers because it sets the timing behavior needed for correct on-screen presentation or VBI insertion.
For transcoding, the access unit is released when the matching video line and field parity are available and the system clock has reached the relevant PTS. For direct decoding, release happens when a complete access unit is available and the clock condition is met.
What terms does SIST EN 300 472 V1.2.2:2005 define?
- MPEG-2 - Refers to ISO/IEC 13818-1, which defines the systems coding used for TS and PES.
- section - A syntax structure used to map Service Information into TS packets.
- service - A broadcaster-controlled sequence of programmes that can be scheduled and broadcast together.
- Teletext descriptor - The descriptor in the Program Map Table that identifies streams carrying EBU data.
- PES (Packetized Elementary Stream) - The packet layer used here to carry Teletext data before it is placed into TS packets.
- PTS (Presentation Time Stamp) - The timing reference used to decide when a Teletext access unit should be presented.
- VBI (Vertical Blanking Interval) - The analogue video interval where Teletext may be transcoded for compatibility with existing receivers.
Who uses SIST EN 300 472 V1.2.2:2005?
SIST EN 300 472 V1.2.2:2005 is used by DVB broadcasters, multiplex engineers, service providers, receiver manufacturers, and Teletext or subtitle system developers. They use it to signal Teletext in PSI/PMT data, build compliant transport streams, and design decoders that handle subtitle timing and VBI transcoding correctly.
What changed in SIST EN 300 472 V1.2.2:2005 from the previous edition?
SIST EN 300 472 V1.2.2:2005 is a version that was previously an ETS and was updated with editorial changes only:
- the DVB logo was added to the front page
- the title wording was changed to the DVB form
- the foreword was updated with a DVB acknowledgement
Which standards are used with SIST EN 300 472 V1.2.2:2005?
- ISO/IEC 13818-1 - Supplies the MPEG-2 systems syntax used for TS and PES packet handling.
- EN 300 468 - Provides Service Information, including the PMT and the Teletext descriptor used to identify Teletext streams.
- ITU-R Recommendation 653 - Defines System B, 625/50 television systems and the Teletext packet structure referenced by the standard.
- EBU SPB 492 - Gives the Teletext specification for 625-line television systems that the document follows for EBU Teletext data.
What does the SIST EN 300 472 V1.2.2:2005 document contain?
Clause 4 contains the core packet syntax and semantics, including tables for the PES_data_field, the EBU Teletext data_field, data_identifier, data_unit_id, and line_offset. Clause 5 contains a conceptual decoder model with buffer sizes, transfer rate, and PTS-based presentation rules.
The document also includes the foreword, intellectual property rights notice, contents, and history. These parts help implementers understand how the standard is structured and how the Teletext carriage rules relate to DVB signaling and decoder timing.
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Frequently Asked Questions
SIST EN 300 472 V1.2.2:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams". This standard covers: This version contains changes of an entirely editorial nature as follows: 1)add the DVB logo to the front page of the deliverable; 2)change the title from: Digital broadcasting systems for television, sound and data services;etc. to Digital Video Broadcast (DVB);etc.; 3)add in the foreword the DVB acknowledgement.
This version contains changes of an entirely editorial nature as follows: 1)add the DVB logo to the front page of the deliverable; 2)change the title from: Digital broadcasting systems for television, sound and data services;etc. to Digital Video Broadcast (DVB);etc.; 3)add in the foreword the DVB acknowledgement.
SIST EN 300 472 V1.2.2:2005 is classified under the following ICS (International Classification for Standards) categories: 33.170 - Television and radio broadcasting. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 472 V1.2.2:2005 is associated with the following European legislation: Standardization Mandates: T-304. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 300 472 V1.2.2:2005 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2005
Digitalna videoradiodifuzija (DVB) – Specifikacija za prenos teleteksta po
standardu ITU-R sistem B v bitnih tokih digitalne videoradiodifuzije
Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext
in DVB bitstreams
Ta slovenski standard je istoveten z: EN 300 472 Version 1.2.2
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 300 472 V1.2.2 (1997-08)
European Standard (Telecommunications series)
Digital Video Broadcasting (DVB);
Specification for conveying ITU-R System B Teletext
in DVB bitstreams
European Broadcasting Union Union Européenne de Radio-Télévision
EBU
UER
European Telecommunications Standards Institute
2 EN 300 472 V1.2.2 (1997-08)
Reference
REN/JTC-00DVB-47 (4dc00ipc.PDF)
Keywords
DVB, digital, video, broadcasting, TV, Teletext,
MPEG
ETSI Secretariat
Postal address
F-06921 Sophia Antipolis Cedex - FRANCE
Office address
650 Route des Lucioles - Sophia Antipolis
Valbonne - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
X.400
c= fr; a=atlas; p=etsi; s=secretariat
Internet
secretariat@etsi.fr
http://www.etsi.fr
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997.
© European Broadcasting Union 1997.
All rights reserved.
3 EN 300 472 V1.2.2 (1997-08)
Contents
Intellectual Property Rights.4
Foreword .4
1 Scope.5
2 Normative references .5
3 Definitions and abbreviations .5
3.1 Definitions . 5
3.2 Abbreviations. 6
4 Insertion of Teletext into MPEG-2 transport multiplex.6
4.1 Transport Stream (TS) packet format . 6
4.2 PES packet format . 6
4.3 Syntax for PES data field. 7
4.4 Semantics for PES data field. 7
5 Teletext decoder model.9
History.10
4 EN 300 472 V1.2.2 (1997-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of
ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSI
Web server (http://www.etsi.fr/ipr).
Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
No guarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on
http://www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document.
Foreword
This version, previously as an ETS now an EN, contains changes of an entirely editorial nature as follows:
1) add the DVB logo to the front page of the deliverable;
2) change the title from: "Digital broadcasting systems for television, sound and data services; etc." to "Digital
Video Broadcast (DVB); etc.";
3) add in the foreword the DVB acknowledgement.
This European Standard (Telecommunications series) has been produced by the Joint Technical Committee (JTC) of the
European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the
European Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific field
of broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in the
Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and
television receivers. The EBU is a professional association of broadcasting organizations whose work
includes the co-ordination of its members' activities in the technical, legal, programme-making and
programme-exchange domains. The EBU has active members in about 60 countries in the European
broadcasting area; its headquarters is in Geneva *.
* European Broadcasting Union
Case Postale 67
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: +41 22 717 21 11
Fax: +41 22 717 24 81
Digital Video Broadcasting (DVB) Project
Founded in September 1993, the DVB Project is a market-led consortium of public and private sector organizations in
the television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television
services. Now comprising over 200 organizations from more than 25 countries around the world, DVB fosters market-
led systems, which meet the real needs, and economic circumstances, of the consumer electronics and the broadcast
industry.
Proposed national transposition dates
Date of adoption of ETS 300 472: 18 October 1996
Date of latest announcement of ETS 300 472 (doa): 31 August 1995
Date of latest publication of new National Standard
or endorsement of ETS 300 472 (dop/e): 29 February 1996
Date of withdrawal of any conflicting National Standard (dow): 29 February 1996
5 EN 300 472 V1.2.2 (1997-08)
1 Scope
The present document specifies the method by which ITU-R System B Teletext (ITU-R Recommendation 653 [3]),
also known as EBU Teletext (see EBU SPB 492 [4]), may be carried in DVB bitstreams. This transport mechanism is
intended to satisfy the following requirements:
- to support the transcoding of the Teletext data into the Vertical Blanking Interval (VBI) of analogue video.
The transcoded signal should be compatible with existing TV receivers with Teletext decoders;
- the 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;
- the transmission mechanism should be capable of transmitting subtitles with accurate timing with respect 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 scope of the present
document, but the transport syntax specified here can also be adapted for other data.
2 Normative references
References may be made to:
a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in
which case, subsequent revisions to the referenced document do not apply; or
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) publications without mention of a specific version, in which case the latest version applies.
A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] ISO/IEC 13818-1 (1994): "Information Technology -
...