SIST EN 300 294 V1.3.2:2003

• Abstract:

  Error in table 2 on page 12. In the top left box of table 2 it reads b0b1b0; this should be b0b1b2. Request from Philipps/Thomson .The error is not vey serious because the text above the table is correct. Editorial change & conversion ETS 300 294 Ed.3 into EN 300 294 version 1.3.2.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.160.25 - Television receivers
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 294 V1.3.2 (1998-04) - Television systems; 625-line television Wide Screen Signalling (WSS)

SIST EN 300 294 V1.3.2:2003 is the Slovenian adoption of EN 300 294 Version 1.3.2 from the European Telecommunications Standards Institute (ETSI). It specifies Wide Screen Signalling (WSS) for 625-line television systems. The standard defines the transmitted signal, the coding, and the information carried so broadcasters and receiver designers can signal aspect ratio, subtitle position, film or camera mode, EDTV, surround sound, and copyright status.

What does SIST EN 300 294 V1.3.2:2003 specify?

SIST EN 300 294 V1.3.2:2003 specifies how WSS is carried in 625-line PAL and SECAM systems when broadcasters need wide screen signalling. It covers the signal format on the line, the meaning of the coded bits, and the way the coded information is inserted into the television signal.

The document is organized into scope, one normative reference, definitions and abbreviations, and requirements. It also includes three informative annexes that describe operating rules, recommendations, and copyright guidance.

Annex	What it covers
Annex A	Rules of operation, including receiver display formats, subtitling, and default behaviour when signalling is absent
Annex B	Recommendations for low-pass pre-filtering and receiver response time
Annex C	Guidelines for copyright information

What are the key requirements of SIST EN 300 294 V1.3.2:2003?

SIST EN 300 294 V1.3.2:2003 defines a fixed WSS line code and a compact 14-bit status message. In practice, this means encoders, transmitters, and decoders have to agree on timing, bit order, and the meaning of each bit so the receiver can switch display modes reliably.

Signal location and coding

The WSS data burst is sent in the first part of line 23, and line 23 is occupied by WSS in each frame. The signal uses a 5 MHz clock, bi-phase-L coding, and a specific pulse shape and amplitude. For implementers, this fixes where to look in the video waveform and how to generate or decode the burst.

Bit structure

The message has 14 bits in total, with 13 data bits and one odd parity bit over the first three data bits. The data are split into four groups: aspect ratio, enhanced services, subtitles, and other information. This structure matters because a decoder only needs to examine a short, defined set of bits to know the programme format.

Aspect ratio signalling

The aspect ratio group labels 4:3, 14:9, 16:9, and >16:9 ranges, and it also carries whether the picture is full format or letterbox and whether the letterbox is centred or top aligned. The standard also gives receiver guidance for matching display modes to the signalled format. In practice, this is the core function of WSS - helping the television choose the right display shape.

Enhanced services and reserved bit

The enhanced services group carries the camera or film bit, the colour coding bit, the helper bit, and one reserved bit that should be set to 0. The notes tie film mode to field dominance guidance in EBU Recommendation R62 and limit helper signalling to certain wide formats. This tells implementers when extra enhancement data may be used and keeps one bit available for future use.

Subtitles, surround sound, and copyright

The subtitles group signals whether subtitles are within Teletext and whether they are in the active image area or outside it. The other group carries surround sound information and copyright flags. For broadcasters, these bits help receivers preserve subtitles correctly and pass on rights information with the programme.

What terms does SIST EN 300 294 V1.3.2:2003 define?

• letterbox operation - A picture format with an aspect ratio greater than 1,33 that adds black lines to fit a 4:3 transmission format.
• Wide Screen Signalling (WSS) - The signalling carried in the video signal to tell the receiver about picture format and related service information.
• Enhanced Definition TeleVision (EDTV) - A service category included in the signalling for enhanced television features.
• Phase Alternation Line (PAL) - The colour television system named in the scope as a supported 625-line system.
• Sequentiell E Couleur Avec Memoire (SECAM) - The other supported 625-line colour television system named in the scope.
• Non-Return-to-Zero (NRZ) - A symbol format listed among the abbreviations used in the document.
• Least Significant Bit (LSB) and Most Significant Bit (MSB) - Bit-order terms used to describe how the data bits are arranged and transmitted.

Who uses SIST EN 300 294 V1.3.2:2003?

Broadcasters use SIST EN 300 294 V1.3.2:2003 when they need to signal picture format, subtitles, and service features in 625-line PAL or SECAM services. Television receiver and decoder manufacturers use it to design automatic aspect-ratio handling and WSS decoding.

It is also relevant to system integrators and test engineers working on analogue television broadcasting equipment. They use it to check that transmitted line 23 signalling matches the required coding and that receivers react as intended.

What changed in SIST EN 300 294 V1.3.2:2003 from the previous edition?

SIST EN 300 294 V1.3.2:2003 is an editorial conversion of ETS 300 294 Edition 3 into EN 300 294 Version 1.3.2. The scope note also records a correction in Table 2: the top-left box should read b0b1b2, while the explanatory text above the table is already correct.

Which standards are used with SIST EN 300 294 V1.3.2:2003?

The only normative reference named is EBU Recommendation R62 (1990), "Recommendation dominant field for 625-line 50 Hz processing". The standard uses it for the field-dominance note associated with the film mode bit, so implementers need it when handling film-related signalling.

What does the SIST EN 300 294 V1.3.2:2003 document contain?

The document contains the line code specification, the timing and amplitude of the status-bit burst, and the tables that map bit patterns to aspect ratio, enhanced services, subtitles, surround sound, and copyright information. It also includes Figure 1 for the position of the signalling on line 23, Figure 2 for bi-phase-L coding, and Figure 3 for subtitle placement examples.

Annex A gives operating rules for receiver display formats and subtitling, including what to do when signalling is absent. Annex B gives implementation recommendations on filtering and response time, and Annex C gives guidance on how to interpret the copyright bits.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Television systems; 625-line television Wide Screen Signalling (WSS)33.170Televizijska in radijska difuzijaTelevision and radio broadcasting33.160.25Televizijski sprejemnikiTelevision receiversICS:Ta slovenski standard je istoveten z:EN 300 294 Version 1.3.2SIST EN 300 294 V1.3.2:2003en01-december-2003SIST EN 300 294 V1.3.2:2003SLOVENSKI
STANDARD
European Telecommunications Standards Institute EN 300 294 V1.3.2 (1998-04)European Standard (Telecommunications series)Television systems;625-line televisionWide Screen Signalling (WSS)EBUUEREuropean Broadcasting UnionUnion Européenne de Radio-TélévisionSIST EN 300 294 V1.3.2:2003

EN 300 294 V1.3.2 (1998-04)2ReferenceREN/JTC-WSS-2 (2q000j1c.PDF)KeywordsWide screen, signalling, analogue, TVETSI SecretariatPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail]://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo 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 1998.© European Broadcasting Union 1998.All rights reserved.SIST EN 300 294 V1.3.2:2003

EN 300 294 V1.3.2 (1998-04)3ContentsIntellectual Property Rights.4Foreword.4Introduction.41Scope.52Reference.53Definition, symbols and abbreviations.53.1Definition.53.2Symbols and abbreviations.54Requirements.64.1Line code.64.1.1Position.64.1.2Clock frequency.74.1.3Pulse shape.74.1.4Signal amplitude.74.1.5Modulation coding.74.1.6Preamble.84.1.7Data bits.84.1.8Odd parity bit.84.2Information content of data bits.104.2.1Data group 1.104.2.1.1Aspect ratio.104.2.2Data group 2, enhanced services.114.2.2.1Film bit.114.2.2.2Colour coding bit.114.2.2.3Helper bit.114.2.2.4Bit b7.114.2.3Data group 3, subtitles.124.2.3.1Subtitles within Teletext bit.124.2.3.2Subtitling mode.124.2.4Data group 4, others.124.2.4.1Surround sound bit.124.2.4.2Copyright information.13Annex A (informative):Rules of operation.14A.1Receiver display formats.14A.2Subtitling.14A.3Procedure in absence of signalling.15Annex B (informative):Recommendations.16B.1Low pass pre-filtering.16B.2Response time on a change in the received signalling information.16Annex C (informative):Guidelines.17C.1Copyright information.17History.18SIST EN 300 294 V1.3.2:2003

EN 300 294 V1.3.2 (1998-04)4Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on the ETSI Webserver) which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Joint Technical Committee (JTC) of theEuropean Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and theEuropean Telecommunications Standards Institute (ETSI).NOTE:The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific fieldof broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in theMemorandum of Understanding also CENELEC, which is responsible for the standardization of radio andtelevision receivers. The EBU is a professional association of broadcasting organizations whose workincludes the co-ordination of its members' activities in the technical, legal, programme-making andprogramme-exchange domains. The EBU has active members in about 60 countries in the Europeanbroadcasting area; its headquarters is in Geneva.European Broadcasting UnionCH-1218 GRAND SACONNEX (Geneva)SwitzerlandTel:[phone]Fax:[phone]National transposition datesDate of adoption of this EN:5 Septembre 1997Date of latest announcement of this EN (doa):31 December 1997Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 June 1998Date of withdrawal of any conflicting National Standard (dow):30 June 1998IntroductionFor a smooth introduction of new television services with a 16:9 display aspect ratio in PAL and SECAM standards, it isnecessary to signal the aspect ratio used together with some switching information to the television receiver. Thereceiver should be capable of reacting automatically to this information by displaying the video information in aspecified aspect ratio. This signalling is to be considered separately from the type of system used, but it should allowtransmission of system related switching information as well.The present document permits the later allocation of additional switching information, related to the introduction ofenhanced television services.The present document is applicable for 625-line PAL and SECAM television systems, but there is potential to adopt it toother standards as well.SIST EN 300 294 V1.3.2:2003

EN 300 294 V1.3.2 (1998-04)51ScopeThis European Standard (Telecommunications series) is applicable to 625-line PAL and SECAM systems in use, incase, where wide screen signalling is required by the broadcasters.It specifies the wide screen signalling information, the coding and the way of incorporating the coded information into a625-line system.The wide screen signalling information contains information on the aspect ratio range of the transmitted signal and itsposition, on the position of the subtitles and on the camera/film mode. Furthermore signalling for EDTV and forsurround sound is included. Some bits are reserved for future use.The present document specifies the transmitted signal. Annex A gives the rules of operation for the minimumrequirements for receiver display formats as well as for subtitling. Annex B gives recommendations. Annex C gives aguideline for copyright information.2ReferenceReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)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 samenumber.[1]EBU Recommendation R62 (1990): "Recommendation dominant field for 625-line 50 Hzprocessing".3Definition, symbols and abbreviations3.1DefinitionFor the purposes of the present document, the following definition applie
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