1、ETSI EN 300 294 VI .4.1 (2003-04) European Sfandard (Telecommunicafions series) Television systems; 625-line television Wide Screen Signalling (WSS) 2 ETSI EN 300 294 VI .4.1 (2003-04) The pre ent d Reference REN/JTC-WSS-3 Keywords analogue, signalling, TV, wide screen ETSI 650 Route des Lucioles F-
2、O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: http:lwmv
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5、 a rgltbistat uslstatus .as p If you find errors in the present document, send your comment to: Cori vriaht Notifica tion No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunicatio
6、ns Standards Institute 2003. O European Broadcasting Union 2003. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM
7、 is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI EN 300 294 VI . 4.1 (2003-04) Contents Intellectual Property Rights 4 Foreword . 4 Introduction 4 1 2 3 3.1 3.2 3.3 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.7 4.1.8 4.2 4.2.1
8、4.2.1.1 4.2.2 4.2.2.1 4.2.2.2 4.2.2.3 4.2.2.4 4.2.3 4.2.3.1 4.2.3.2 4.2.4 4.2.4.1 4.2.4.2 Scope 5 References 5 Definition. symbols and abbreviations . 5 5 5 6 Requirements 6 Line code 6 Position . 6 Clock Iiequency 7 Pulse shape 7 Signal amplitude . 7 Modulation coding 7 Preamble . 8 Data bits 8 Odd
9、 parity bit 8 Information content of data bits . 10 Data group 1 . 10 Aspect ratio . 10 Data group 2, enhanced services . 11 11 11 11 Bit b7 . 11 Data group 3. subtitles 12 Subtitles within Teletext bit 12 Subtitling mode 12 Data group 4. other 12 Surround sound 12 Copyright informa 13 Annex A (info
10、rmative): Rules of operation 14 A.l 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): Gui
11、delines . 17 C . 1 Annex D (informative): Future use of bit 7 18 History 20 Copyright information 17 ETSI 4 ETSI EN 300 294 VI .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 the
12、se essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR O00 314: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest u
13、pdates are available on the ETSI Web server (htttwp :l;webawpiwi .c tsi .ordIPR/honie. am). 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 Te
14、chnical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comit Europen 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 t
15、he 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 broadcast
16、ing 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 C
17、H-I218 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: Date of latest announcement of this EN (doa): Date of latest publication of new National Standard or endorsement of this EN (dop/e): Date of withdrawal of
18、any conflicting National Standard (dow): 11 April 2003 3 1 July 2003 3 1 January 2004 3 1 January 2004 I n t rod uct ion 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 som
19、e 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 transmiss
20、ion 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 pote
21、ntial to adopt it to other standards as well. ETSI 5 ETSI EN 300 294 VI .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
22、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 camerdfilm mode. Furthermore signalling for
23、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 give
24、s a guideline for copyright information. Annex D describes how the one remaining unused bit can be used to convey multi-bit information. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are eit
25、her specific (identified by date of publication andor 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 exp
26、ected location might be found at http: /docbcts.etsi.ctrg/Referenct il EBU Recommendation R62 (1 998): “Recommended dominant field for 625-line 50-Hz video processing“. 3 Definition, symbols and abbreviations 3.1 De fin it ion For the purposes of the present document, the following definition applie
27、s: 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 Fs clock frequency Oh fal
28、ling sync edge Td data bit period Ts sampling period ETSI 6 ETSI EN 300 294 VI .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 NFU Non-Return-to-Zero P
29、AL SECAM wss Wide Screen Signalling Phase Alternation Line (Colour TV-System) SequentiellE Couleur Avec Memoire (French Colour-TV System) 4 Requirements 4.1 Line code The following clauses speciSl the line code of the Wide Screen Signalling (WSS). 4.1.1 Position The signalling bits shall be transmit
30、ted 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,O f 0,25 ps from Oh 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 o
31、f commonality between PAL and SECAM, the colour burst and chrominance sub-carrier are not shown. Peak white level / Oh / 5C0mVf5% T - 16:9 Group 1 shall contain 4 bits in which the fiist 3 bits carry data and the last bit shall denote the odd parity bit over the first three data bits. Group 2 shall
32、contain 4 data bits, group 3 shall contain 3 data bits and group 4 shall contain 3 data bits. Aspect ratio range Active lines a 1,90 c 405 The data bits shall be labelled bo up to and including b, combined with b, up to and including b13. b, shall be the odd parity bit as is shown in tables 1 and 2.
33、 The index also indicates the order of transmission: bO shall be the fiist transmitted bit. 4.2.1 Data group 1 4.2.1 .I Aspect ratio bo, b, b,: shall denote the aspect ratio label, the letterbox format and position according to table 2. b, : shall denote the odd parity of bo, bl, b2, b3 according to
34、 table 2. I O00 11 I 4:3 I full format I not applicable I 576 I I 1 O0 I O I 14:9 I letterbox I centre I 504 I pj o11 14:9 16:9 16:9 16:9 14:9 I 1 1 1 I O I 16:9 I full format (anamorphic) I not applicable I 576 I NOTE 1: The number of active lines is only an indication for the exact aspect ratio a
35、= 1,33, a = 1,57 and a = 1,78. NOTE 2: The actual transmitted aspect ratio is 4:3, but a 14:9 centre window should contain all the relevant picture content to encourage a wide screen display on a 16:9 television set. The aspect ratio label indicates a range of possible aspect ratio. All aspect ratio
36、s falling in these ranges shall be labelled by the same code. Table 3 indicates the aspect ratio ranges. ETSI 4.2.2 O 4.2.2.1 b,: camera mode (see note 1) 11 Data group 2, enhanced services Film bit shall denote the film bit in accordance with table 4. Table 4: Film bit 1 ETSI EN 300 294 VI .4.1 (20
37、03-04) film mode (see notes 2 and 3) 4.2.2.2 b, : b6 4.2.2.3 b,: Helper bit I bA I Film bit O No helper Colour coding bit shall denote the colour coding bit in accordance with table 5. 1 Table 5: Colour coding bit Motion Adaptive Colour Plus (see note) NOTE: In film mode (bit b4 = I), Motion Adaptiv
38、e Colour Plus is set to “fixed“ Colour Plus operation, .e. it is not motion adaptive. Modulated helper (see note) Helper bit shall denote the helper bit in accordance with table 6. 4.2.2.4 NOTE: A helper signal may be present only when the aspect ratio label is either “1 6:9 letterbox centre“ or “ 1
39、6:9 letterbox centre“ and the number of active lines 16:9 case 4 A. 1 Receiver dis play formats To ensure automatic selection of the most appropriate display mode, the receiver with a 16:9 display should comply with the following minimum requirements: Case 1: Case 2: Case 3: Case 4: 4:3 Full format:
40、 The 4:3 aspect ratio picture should be displayed centred with black bars at the left and right hand side of the display. Letterbox signalled as 14:9: the 14:9 aspect ratio picture should be displayed using one of the following two methods: a) the 14:9 aspect ratio picture should be displayed centre
41、d with small bars at the left and right hand sides of the display; the 14:9 picture may be displayed filling the full width of the visible screen by incorporating a small horizontal geometrical error, typically 8 %. b) Letterbox signalled as 16:9: the 16:9 aspect ratio picture should be displayed us
42、ing the full width of the screen. Letterbox signalled as 16:9: the 16:9 aspect ratio picture should be displayed using one of the following two methods: a) as under case 3; b) the 16:9 picture may be displayed using the full height of the screen, by rther zooming in. It should be noted that the view
43、er should be free to override the automatically selected display condition. The speed of the automatic change of aspect ratio is limited mainly by the response time of the deflection circuit. A.2 Subtitling When the subtitling of letterboxed pictures is in, or partly in the “out-of active image area
44、“, the new 16:9 receivers will lose this information, unless they display the picture in the 4:3 mode. This would mean that on the 16:9 receiver, black bars would be present all around the active image content and this should be avoided. To serve both the interests of the existing 4:3 and the new 16
45、:9 viewers, it is of great importance, that: - wide screen programmes should always have the subtitling (whether “in active image area“ or “out of active image area“) conveyed as well by means of the Teletext service; new 16:9 receivers, complying with the present document, should be equipped with a
46、 Teletext decoder and always have the possibility of detecting the Teletext presence bit b,. - ETSI 15 ETSI EN 300 294 VI .4.1 (2003-04) A.3 Procedure in absence of signalling In the absence of signalling bits, the receiver should go to a default mode. ETSI 16 ETSI EN 300 294 VI .4.1 (2003-04) Annex
47、 B (informative): Recommendations B.l Low pass pre-filtering It is recommended that the received status bit is low pass filtered before decoding. This low pass filter should preserve the main spectral energy of the status bits signal, which resides in the spectral domain of O MHz up to 1,67 MHz. B.2
48、 Response time on a change in the received signalling information The maximum response time on a change in the received status bits signalling information is recommended to be: 120 ms. ETSI 17 ETSI EN 300 294 VI .4.1 (2003-04) Annex C (informative): Gu id el i nes C. 1 Copyright information The sett
49、ing of data bit b, to “O“ does not mean that there are no constraints on the use of the programme material if copied (as is the case in the absence of signalling bits). b12b13 = OO is identical to the absence of signalling bits (see clause A3). ETSI 18 ETSI EN 300 294 VI .4.1 (2003-04) Framing Bits Annex D (informative): Future use of bit 7 Message Bits Protocol Bit Message Bits Protocol Bit Message Bits Protocol Bit (part 1) (part 2) (part N) Framing Bits Assuming that a single bit is used for a Protocol Bit, the number of bits required in the Framing Code is given b
