1、 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 Ja
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8、ANCHI/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
9、 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:inmail
10、iec.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 FOREWOR
11、D.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 Trig
12、ger 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 A
13、nnex 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_m
14、essage.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 In
15、ternational 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 electr
16、onic 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
