SIST EN 300 294 V1.4.1:2003
(Main)Television systems; 625-line television Wide Screen Signalling (WSS)
- Abstract
The former EACEM Project Team 1.4 (Data Services) prepared some changes, corrections and additions. The details are given in document J23d06, submitted to the 23rd meeting of JTC Broadcast.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 294 V1.4.1:2003 is the Slovenian adoption of ETSI EN 300 294 V1.4.1, a European telecommunications standard for Wide Screen Signalling (WSS) in 625-line television systems. It specifies the WSS signal, the coding of that signal, and how the coded information is inserted into 625-line PAL and SECAM broadcasts for broadcasters and television receiver designers. In practice, it is used to signal aspect ratio, subtitle placement, camera or film mode, EDTV features, surround sound, and copyright-related status.
What does SIST EN 300 294 V1.4.1:2003 specify?
SIST EN 300 294 V1.4.1:2003 specifies WSS for 625-line PAL and SECAM systems where broadcasters need wide screen signalling. The document covers the transmitted signal, the coding of the information, and the way the coded data is carried in the television line structure.
The standard is organized into four main clauses and four informative annexes. Clause 1 states the scope, clause 2 lists the references, clause 3 gives the definition, symbols and abbreviations, and clause 4 gives the requirements. The annexes cover operating rules, recommendations, copyright guidance, and future use of reserved bit 7.
| Annex | What it covers |
|---|---|
| Annex A | Rules of operation for receiver display formats, subtitling, and behaviour when signalling is absent |
| Annex B | Recommendations for low-pass pre-filtering and response time to changes in signalling |
| Annex C | Guideline for copyright information |
| Annex D | Future use of reserved bit 7, including a method for sending multi-bit information |
What are the key requirements of SIST EN 300 294 V1.4.1:2003?
SIST EN 300 294 V1.4.1:2003 defines both the physical line coding and the meaning of the data bits. For implementers, this means a WSS encoder or decoder has to get the timing, the bit framing, and the bit interpretation right for the receiver to react correctly.
- Clause 4.1.1 places the WSS burst in the first part of line 23, starting at a fixed offset from the horizontal sync, and it says line 23 shall carry WSS in each frame. In practice, a receiver must look for the signalling on that line and in that position.
- Clause 4.1.2 fixes the clock frequency at 5 MHz. This sets the timing base for encoding and sampling.
- Clause 4.1.3 defines the pulse shape as approximately sine square, and clause 4.1.4 sets the signal amplitude relative to the video signal. This matters because a compliant waveform must be shaped and leveled so that decoders can detect it reliably.
- Clause 4.1.5 requires bi-phase-L coding, and clauses 4.1.6 to 4.1.8 define the preamble, the 14-bit structure, and the odd parity bit. In practice, this is the frame format a transmitter must generate and a receiver must decode.
- Clause 4.2.1 assigns data group 1 to aspect ratio and letterbox information. It distinguishes labels such as 4:3, 14:9, 16:9, and >16:9, with centre or top letterbox positions. This tells the receiver how to choose a display mode.
- Clause 4.2.2 assigns data group 2 to enhanced services. It carries the film bit, the colour coding bit, the helper bit, and a reserved bit. This lets the broadcaster signal camera or film mode, standard or Motion Adaptive Colour Plus coding, and whether a helper signal is present.
- Clause 4.2.3 assigns data group 3 to subtitles. It signals whether subtitles are within Teletext and whether they are in the active image area or out of it. This is important for preserving subtitle visibility on both 4:3 and 16:9 receivers.
- Clause 4.2.4 assigns data group 4 to surround sound and copyright information. It carries a surround sound mode flag and copyright status, including whether copying is restricted.
Annex A adds receiver behaviour that matters in use. It describes the minimum display handling expected from a 16:9 receiver for different aspect ratio labels and notes that the viewer should be able to override the automatic choice. It also gives a default mode when signalling is absent. Annex B recommends low-pass pre-filtering before decoding and gives a maximum response time to a change in signalling. Annex D explains how the reserved bit can be used as part of a serial stream for future multi-bit values.
What terms does SIST EN 300 294 V1.4.1:2003 define?
SIST EN 300 294 V1.4.1:2003 defines the term letterbox operation as using a picture with an aspect ratio greater than 1,33 by adding empty black lines to fit a 4:3 transmission format. This is the basic case WSS is meant to signal.
Wide Screen Signalling (WSS) is the signalling method defined by the standard for carrying display and service information in a 625-line television signal. It is the core subject of the document.
Enhanced Definition TeleVision (EDTV) is one of the service areas that can be signalled in the data bits. In practice, it tells the receiver that enhanced television features may be present.
Phase Alternation Line (PAL) is one of the television systems named in the scope and introduction. The standard applies to 625-line PAL broadcasts.
SequentiellE Couleur Avec Memoire (SECAM) is the other television system named in the scope. The standard also applies to 625-line SECAM broadcasts.
Least Significant Bit (LSB) identifies the bit with the smallest value in the data groups. The bit order matters for correct transmission and decoding.
Most Significant Bit (MSB) identifies the bit with the highest value in the data groups. Together with the LSB, it defines the coding order used by the WSS data.
Who uses SIST EN 300 294 V1.4.1:2003?
SIST EN 300 294 V1.4.1:2003 is used by broadcasters, receiver manufacturers, and engineers working on analogue television signalling. It is also relevant to decoder designers, test laboratories, and quality teams that need to check whether a 625-line system can signal aspect ratio, subtitle placement, and service flags correctly.
In practice, broadcasters use it when they need a programme signal to tell receivers how to display the picture. Receiver designers use it to implement automatic aspect-ratio switching and subtitle handling. Quality managers and testers use it to verify that the transmitted WSS line, timing, and bit meanings match the expected behaviour.
What changed in SIST EN 300 294 V1.4.1:2003 from the previous edition?
SIST EN 300 294 V1.4.1:2003 is identified in the document history as a later publication after earlier ETS 300 294 editions, including V1.3.2. The scope also states that the former EACEM Project Team 1.4 prepared changes, corrections and additions, with the details given in document J23d06 submitted to the 23rd meeting of JTC Broadcast.
Which standards are used with SIST EN 300 294 V1.4.1:2003?
The references clause names one external document: EBU Recommendation R62 (1998), “Recommended dominant field for 625-line 50-Hz video processing”. Clause 4.2.2.1 uses it as the field-dominance reference for film mode, so implementers need it when aligning WSS film signalling with video processing practice.
What does the SIST EN 300 294 V1.4.1:2003 document contain?
SIST EN 300 294 V1.4.1:2003 contains the full WSS transmission scheme, including line position, clocking, pulse shape, signal amplitude, bi-phase coding, preamble structure, and the division of bits into four data groups. It includes tables for aspect ratio labels, film mode, colour coding, helper signalling, subtitle signalling, surround sound, and copyright status.
The document also includes figures showing the WSS position on line 23, the bi-phase coding example, subtitle placement in letterbox pictures, and the reserved-bit future-use method. Annex D adds worked message-sequence examples for reusing bit 7 as a serial data stream. Annex A and Annex B provide operating guidance for display behaviour, subtitling, filtering, and response time, which are useful for receiver design, testing, and verification.
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Frequently Asked Questions
SIST EN 300 294 V1.4.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Television systems; 625-line television Wide Screen Signalling (WSS)". This standard covers: The former EACEM Project Team 1.4 (Data Services) prepared some changes, corrections and additions. The details are given in document J23d06, submitted to the 23rd meeting of JTC Broadcast.
The former EACEM Project Team 1.4 (Data Services) prepared some changes, corrections and additions. The details are given in document J23d06, submitted to the 23rd meeting of JTC Broadcast.
SIST EN 300 294 V1.4.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.160.25 - Television receivers. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 294 V1.4.1:2003 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-december-2003
7HOHYL]LMVNLVLVWHPL±6LJQDOL]DFLMD :66 SULãLURNR]DVORQVNLYUVWLþQLWHOHYL]LML
Television systems; 625-line television Wide Screen Signalling (WSS)
Ta slovenski standard je istoveten z: EN 300 294 Version 1.4.1
ICS:
33.160.25 Televizijski sprejemniki Television receivers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
European Standard (Telecommunications series)
Television systems;
625-line television
Wide Screen Signalling (WSS)
European Broadcasting Union Union Européenne de Radio-Télévision
EBU·UER
2 ETSI EN 300 294 V1.4.1 (2003-04)
Reference
REN/JTC-WSS-3
Keywords
analogue, signalling, TV, wide screen
ETSI
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© European Telecommunications Standards Institute 2003.
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ETSI
3 ETSI EN 300 294 V1.4.1 (2003-04)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
1 Scope.5
2 References.5
3 Definition, symbols and abbreviations.5
3.1 Definition.5
3.2 Symbols.5
3.3 Abbreviations.6
4 Requirements.6
4.1 Line code.6
4.1.1 Position.6
4.1.2 Clock frequency.7
4.1.3 Pulse shape.7
4.1.4 Signal amplitude.7
4.1.5 Modulation coding.7
4.1.6 Preamble.8
4.1.7 Data bits.8
4.1.8 Odd parity bit.8
4.2 Information content of data bits .10
4.2.1 Data group 1 .10
4.2.1.1 Aspect ratio.10
4.2.2 Data group 2, enhanced services.11
4.2.2.1 Film bit.11
4.2.2.2 Colour coding bit .11
4.2.2.3 Helper bit.11
4.2.2.4 Bit b .11
4.2.3 Data group 3, subtitles .12
4.2.3.1 Subtitles within Teletext bit .12
4.2.3.2 Subtitling mode.12
4.2.4 Data group 4, others.12
4.2.4.1 Surround sound bit .12
4.2.4.2 Copyright information.13
Annex A (informative): Rules of operation .14
A.1 Receiver display formats.14
A.2 Subtitling.14
A.3 Procedure in absence of signalling.15
Annex B (informative): Recommendations.16
B.1 Low pass pre-filtering .16
B.2 Response time on a change in the received signalling information .16
Annex C (informative): Guidelines .17
C.1 Copyright information.17
Annex D (informative): Future use of bit 7 .18
History .20
ETSI
4 ETSI EN 300 294 V1.4.1 (2003-04)
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 ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
All published ETSI deliverables shall include information which directs the reader to the above source of information.
Foreword
This European Standard (Telecommunications series) has been produced by Joint Technical Committee (JTC)
Broadcast of the European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique
(CENELEC) and the European Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the
specific field of broadcasting and related fields. Since 1995 the JTC Broadcast 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
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: +41 22 717 21 11
Fax: +41 22 717 24 81
National transposition dates
Date of adoption of this EN: 11 April 2003
Date of latest announcement of this EN (doa): 31 July 2003
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2004
Date of withdrawal of any conflicting National Standard (dow): 31 January 2004
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.
The present document permits the later allocation of additional switching information, related to the introduction of
enhanced television services.
The present document is applicable for 625-line PAL and SECAM television systems, but there is potential to adopt it
to other standards as well.
ETSI
5 ETSI EN 300 294 V1.4.1 (2003-04)
1 Scope
The present document 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.
The present document 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. Annex D describes how the one remaining unused bit can be used to convey
multi-bit information.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] EBU Recommendation R62 (1998): "Recommended dominant field for 625-line 50-Hz video
processing".
3 Definition, symbols and abbreviations
3.1 Definition
For the purposes of the present document, the following definition applies:
letterbox operation: 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
For the purposes of the present document, the following symbols apply:
a aspect ratio
F clock frequency
s
0 falling sync edge
h
T data bit period
d
T sampling period
s
ETSI
6 ETSI EN 300 294 V1.4.1 (2003-04)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
EDTV Enhanced Definition TeleVision
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)
WSS Wide Screen Signalling
4 Requirements
4.1 Line code
The following clauses 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 µ s (n o te)
±0,25 µs
3 8,4 µ s
42 ,5 µs
NOTE: For optimum decoder performance, it is recommended that this period is free from other signals.
Figure 1: Position of status bit signalling in line 23
In each frame line 23 shall be occupied with the WSS.
ETSI
7 ETSI EN 300 294 V1.4.1 (2003-04)
4.1.2 Clock frequency
-4
The clock frequency shall be: Fs = 5 MHz (± 1 × 10 );
The period shall be: Ts = 200 ns.
4.1.3 Pulse shape
The pulse shaping function h(τ) shall be approximately a sine square:
2 πτ π
h()τ ≈ sin + ||τ ≤T
S
TT22
2 s
0 els
...