SIST ETS 300 294 E3:2003

• Abstract:

  To include copyright information in bits 12 and 13.

• 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 ETS 300 294 ed.3 (1997-09) - Television systems; 625-line television Wide Screen Signalling (WSS)

SIST ETS 300 294 E3:2003 is the Slovenian adoption of ETS 300 294 Edition 3 from the European broadcasting and telecommunications standards bodies. It specifies Wide Screen Signalling (WSS) for 625-line PAL and SECAM television, including how the signal is coded, where it is inserted, and how copyright information is carried in bits 12 and 13. It is aimed at broadcasters and receiver designers who need televisions to recognise aspect ratio, subtitles, enhanced services, surround sound and related switching information.

What does SIST ETS 300 294 E3:2003 specify?

SIST ETS 300 294 E3:2003 specifies the WSS signal for 625-line PAL and SECAM systems when broadcasters need wide screen signalling. It covers the transmitted signal itself, the information carried by the bits, and the way that coded information is inserted into the television line structure.

The document is organised into four main clauses and three informative annexes:

Part	What it covers
Clause 1	Scope of WSS for 625-line PAL and SECAM systems
Clause 2	Normative reference
Clause 3	Definition, symbols and abbreviations
Clause 4	Signal requirements and bit assignments
Annex A	Rules of operation, including receiver display formats and subtitling
Annex B	Recommendations for filtering and response time
Annex C	Guidelines for copyright information

In practice, this structure lets an encoder designer see how to generate the signal, and lets a receiver designer see how to interpret it and choose a display mode.

What are the key requirements of SIST ETS 300 294 E3:2003?

SIST ETS 300 294 E3:2003 defines a very specific signal format. The most important requirements are the line position and timing, the coding method, the bit layout, and the meaning of each data group.

Signal placement and coding

The WSS bits shall be transmitted as a data burst in the first part of line 23. The start of the burst is positioned at 11.0 µs ± 0.25 µs from the horizontal sync edge, and line 23 shall be occupied with WSS in each frame. This matters because receivers depend on stable timing to find and decode the signal reliably.

The clock frequency is 5 MHz, the pulse shape is approximately sine-squared, the half-amplitude pulse duration is 200 ns ± 10 ns, and the signal amplitude is 0.5 V ± 5% relative to a 700 mV maximum video signal. The data are coded using bi-phase-L. In practice, these details define the electrical shape of the signal so that encoders and decoders stay compatible.

Data structure and error detection

The transmission scheme uses 14 bits in total, with 13 bits available for information and one bit used for error detection by odd parity over the first three data bits of the first group. The preamble includes a run-in and a start code. This gives the receiver a way to lock onto the message and check whether the first data group is valid.

The 13 data bits are split into four groups:

• Group 1: aspect ratio and position
• Group 2: enhanced services
• Group 3: subtitles
• Group 4: other information

This grouping matters because encoder logic and receiver parsing can be built around the same message structure.

Aspect ratio signalling

Group 1 carries the aspect ratio label, the letterbox format and the picture position. The labels cover 4:3, 14:9, 16:9 and greater than 16:9, with centre or top positioning where relevant. Table 3 defines the aspect ratio ranges that belong to each label. For a reader, this is the core WSS function: it tells the receiver how to display the picture without manual switching.

Enhanced services

Group 2 carries the film bit, colour coding bit, helper bit and one reserved bit. The film bit distinguishes camera mode from film mode, and film mode is linked to the field dominance rule in EBU Recommendation R62. The colour coding bit distinguishes standard coding from Motion Adaptive Colour Plus. The helper bit indicates whether a modulated helper signal is present, and it is tied to specific wide screen cases. This group matters for encoders that carry advanced picture handling and for receivers that need to interpret those services correctly.

Subtitles, surround sound and copyright

Group 3 carries the subtitles within Teletext bit and the subtitling mode. The subtitling mode distinguishes no open subtitles, subtitles in the active image area, and subtitles out of the active image area. This helps receiver logic and subtitle handling software preserve readability on both 4:3 and 16:9 displays.

Group 4 carries the surround sound bit plus the copyright information bits. Bit 12 indicates whether copyright is asserted, and bit 13 indicates whether copying is restricted. This is especially important because the scope specifically includes copyright information in bits 12 and 13.

Operational guidance

Annex A gives rules of operation for receiver display formats and subtitling, including how a 16:9 receiver should treat 4:3, 14:9, 16:9 and greater than 16:9 pictures. It also says viewers should be able to override the automatic display choice. Annex B recommends low pass pre-filtering of received status bits and recommends a maximum 120 ms response time to signalling changes. In practice, these notes help receiver designers balance speed, stability and subtitle handling.

What terms does SIST ETS 300 294 E3:2003 define?

• Wide Screen Signalling (WSS) - The coded status information sent in line 23 to tell a receiver how to display a 625-line picture.
• letterbox operation - A picture format wider than 1.33 that is padded with black lines so it fits a 4:3 transmission format.
• Enhanced Definition TeleVision (EDTV) - The term used in the document for enhanced television services that may use extra switching information.
• Phase Alternation Line (PAL) - The colour TV system named in the scope as one of the systems that uses WSS.
• SequentiellE Couleur Avec Memoire (SECAM) - The French colour TV system named in the scope as another system that uses WSS.
• Least Significant Bit (LSB) and Most Significant Bit (MSB) - Bit-order terms used in the transmission tables to show how the information is sent.

Who uses SIST ETS 300 294 E3:2003?

SIST ETS 300 294 E3:2003 is used by broadcasters, transmission engineers, receiver manufacturers and decoder designers working with 625-line PAL and SECAM services. It is also relevant to teams that handle teletext, subtitling, aspect-ratio control and enhanced television features.

In practice, these users apply the standard when:

• encoding WSS into the transmitted video line structure
• designing TV receivers that switch display format automatically
• deciding how subtitles should be signalled and shown
• interpreting copyright and surround sound bits
• checking compatibility between broadcast signalling and receiver behaviour

Which standards are used with SIST ETS 300 294 E3:2003?

The normative reference named in SIST ETS 300 294 E3:2003 is:

• EBU Recommendation R62 (1990), “Recommendation dominant field for 625-line 50 Hz processing” - This is used for the field dominance rule mentioned for film mode.

What does the SIST ETS 300 294 E3:2003 document contain?

The document contains the signalling scheme, the bit definitions, and the receiver guidance needed to implement WSS on 625-line PAL and SECAM systems. Clause 4 includes the line-code details, the transmission scheme, and tables for aspect ratio, enhanced services, subtitles, surround sound and copyright information.

It also includes:

• Figure 1 showing the position of the signalling bits in line 23
• Figure 2 showing the bi-phase-L coding concept
• Figure 3 showing subtitle placement examples
• Tables that map bit combinations to picture formats and service flags
• Annex A examples of receiver display behaviour
• Annex B recommendations on filtering and response time
• Annex C guidance on interpreting the copyright bits

For engineers, the useful part of the document is the set of timing, coding and bit-mapping rules. For quality or compliance work, the annexes help explain how receivers should behave when signalling is present, changed or absent.

SLOVENSKI STANDARD
01-december-2003
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Television systems; 625-line television Wide Screen Signalling (WSS)
Ta slovenski standard je istoveten z: ETS 300 294 Edition 3
ICS:
33.160.25 Televizijski sprejemniki Television receivers
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 294
TELECOMMUNICATION September 1997
STANDARD Third Edition
Source: EBU/CENELEC/ETSI-JTC Reference: RE/JTC-00WSS-1
ICS: 33.020
Key words: Wide screen, signalling, analogue, TV
Union Européenne de Radio-Télévision
European Broadcasting Union
Television Systems;
625-line television
Wide Screen Signalling (WSS)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
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.
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ETS 300 294: September 1997
Whilst 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.

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ETS 300 294: September 1997
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative reference.7
3 Definition, symbols and abbreviations.7
3.1 Definition.7
3.2 Symbols and abbreviations.7
4 Requirements.8
4.1 Line code .8
4.1.1 Position.8
4.1.2 Clock frequency.8
4.1.3 Pulse shape.9
4.1.4 Signal amplitude.9
4.1.5 Modulation coding .9
4.1.6 Preamble.10
4.1.7 Data bits .10
4.1.8 Odd parity bit .10
4.2 Information content of data bits .12
4.2.1 Data group 1.12
4.2.1.1 Aspect ratio.12
4.2.2 Data group 2, enhanced services.13
4.2.2.1 Film bit .13
4.2.2.2 Colour coding bit.13
4.2.2.3 Helper bit .13
4.2.2.4 Bit b .13
4.2.3 Data group 3, subtitles .14
4.2.3.1 Subtitles within Teletext bit .14
4.2.3.2 Subtitling mode.14
4.2.4 Data group 4, others.14
4.2.4.1 Surround sound bit .14
4.2.4.2 Copyright information.15
Annex A (informative): Rules of operation .16
A.1 Receiver display formats.16
A.2 Subtitling.17
A.3 Procedure in absence of signalling .17
Annex B (informative): Recommendations .18
B.1 Low pass pre-filtering .18
B.2 Response time on a change in the received signalling information .18

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ETS 300 294: September 1997
Annex C (informative): Guidelines. 19
C.1 Copyright information. 19
History. 20

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ETS 300 294: September 1997
Foreword
This third edition European Telecommunication Standard (ETS) 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
Code Postal 67
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]
Transposition dates
Date of adoption: 5 September 1997
Date of latest announcement of this ETS (doa): 31 December 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 June 1998
Date of withdrawal of any conflicting National Standard (dow): 30 June 1998
Introduction
For a smooth introduction of new television services with a 16:9 display aspect ratio in PAL and SECAM
standards, it is necessary to signal the aspect ratio used together with some switching information to the
television receiver. The receiver should be capable of reacting automatically to this information by
displaying the video information in a specified aspect ratio. This signalling is to be considered separately
from the type of system used, but it should allow transmission of system related switching information as
well.
This ETS permits the later allocation of additional switching information, related to the introduction of
enhanced television services.
This ETS is applicable for 625-line PAL and SECAM television systems, but there is potential to adopt it to
other standards as well.
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ETS 300 294: September 1997
Blank page
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ETS 300 294: September 1997
1 Scope
This third edition European Telecommunication Standard (ETS) is applicable to 625-line PAL and SECAM
systems in use, in case, 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 a 625-line system.
The wide screen signalling information contains information on the aspect ratio range of the transmitted
signal and its position, on the position of the subtitles and on the camera/film mode. Furthermore
signalling for EDTV and for surround sound is included. Some bits are reserved for future use.
This ETS specifies the transmitted signal. Annex A gives the rules of operation for the minimum
requirements for receiver display formats as well as for subtitling. Annex B gives recommendations.
Annex C gives a guideline for copyright information.
2 Normative reference
This ETS incorporates by dated and undated reference, provisions from another publication. This
normative reference is cited at the appropriate places in the text and the publication is listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this ETS
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] EBU Recommendation R62 (1990): "Recommendation dominant field for
625-line 50 Hz processing".
3 Definition, symbols and abbreviations
3.1 Definition
For the purposes of this ETS, the following definition applies:
letterbox operation: Is the use of a picture format with an aspect ratio greater than 1,33, in such a way
that empty (black) lines are added to conform to a 4:3 transmission format.
3.2 Symbols and abbreviations
For the purposes of this ETS, the following symbols and abbreviations apply:
0 falling sync edge
h
a aspect ratio
EDTV Enhanced Definition TeleVision
F clock frequency
s
LSB Least Significant Bit
MSB Most Significant Bit
NRZ Non-Return-to-Zero
PAL Phase Alternation Line (Colour TV-System)
SECAM SequentiellE Couleur Avec Memoire (French Colour-TV System)
T data bit period
d
T sampling period
s
WSS Wide Screen Signalling
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ETS 300 294: September 1997
4 Requirements
4.1 Line code
The following subclauses specify the line code of the Wide Screen Signalling (WSS).
4.1.1 Position
The signalling bits shall be transmitted as a data burst in the first part of line 23.
The position of the beginning of the Wide Screen Signalling bits shall be 11,0 ± 0,25 μs from 0h of the
horizontal sync, as indicated in figure 1. This figure is intended to illustrate the position of the signalling
bits in line 23. For the purpose of commonality between PAL and SECAM, the colour burst and
chrominance sub-carrier are not shown.
Peak white level
500 mV ± 5 %
h
Sync.
level
1,5 μs
10,5 μs
11,0 μs 27 ,4 μs (n o te)
±0,25 μs
38,4 μs
42,5 μs
NOTE: For optimum decoder performance, it is recomm
...