IEC_62297-1-2005.pdf

INTERNATIONAL STANDARD IEC62297-1 First edition2005-05 Triggering messages for broadcast applications Part 1:Format Reference number IEC 62297-1:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONAL STANDARD IEC62297-1 First edition2005-05 Triggering messages for broadcast applications Part 1:Format IEC 2005 Copyright-all rights reserved No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch S For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 62297-1 IEC:2005(E)CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms,definitions and abbreviations.6 3.1 Definitions.6 3.2 Abbreviations.8 4 Trigger message.9 4.1 General.9 4.1.1 Viewer interaction.9 4.1.2 Priority ratings.9 4.1.3 Character coding.9 4.1.4 Future compatibility.9 4.2 Life cycles.9 4.2.1 Trigger message and event message life cycle.9 4.2.2 Event message preparation life cycle.10 4.2.3 Application life cycle.11 4.3 Syntax of trigger message.13 4.3.1 General.13 4.3.2 Trigger text length.13 4.3.3 Syntax of trigger text.13 4.3.4 Trigger repetition.17 Annex A(informative)Recommendations.18 Annex B(informative)Code of practice.19 Bibliography.22 Figure 1 Trigger messages and event messages life cycle.10 Figure 2 TriggerObject life cycle.11 Figure 3 ApplicationObject life cycle.12 Figure B.1 Icon bitmap tailored for a display with a resolution of 640 by 480.20 Table 1 Syntax of trigger_message.13 Table 2 Syntax of trigger_text.13 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.62297-1 IEC:2005(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ TRIGGERING MESSAGES FOR BROADCAST APPLICATIONS Part 1:Format FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees(IEC National Committees).The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.To this end and in addition to other activities,IEC publishes International Standards,Technical Specifications,Technical Reports,Publicly Available Specifications(PAS)and Guides(hereafter referred to as“IEC Publication(s)”).Their preparation is entrusted to technical committees;any IEC National Committee interested in the subject dealt with may participate in this preparatory work.International,governmental and non-governmental organizations liaising with the IEC also participate in