IEC_62777-2016.pdf

IEC 62777 Edition 1.0 2016-02 INTER NA TIONA L STA NDA R D Quality evaluation method for the sound field of directional loudspeak er array systems IEC 62777:2016-02(en)Copyright International Electrotechnical Commission THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC,Geneva,Switzerland All r ights r eserved.Unless otherwise specif ied,no par t of this publication may be reproduced or utilized in any f orm or by any means,electr onic or mechanical,including photocopying and microfilm,without permission in writing f rom either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee f or fur ther information.IEC Central Office Tel.:+41 22 919 02 11 3,r ue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzer land www.iec.ch About the IEC The Inter national Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standar ds f or all electr ical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sur e that you have the latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/cat alogue The stand-alone application for consulting the entir e bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.A vailable for PC,Mac OS,A ndroid Tablets and iPad.IEC publicat ions search-www.iec.ch/searchpub The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdraw n publications.IEC Just Published-webstore.iec.ch/just published Stay up to date on all new IEC publications.Just Published details all new publications released.A vailable online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionar y of electronic and electrical terms containing 20 000 terms and definitions in English and French,with equivalent terms in 15 additional languages.A lso known as the International Electrotechnical Vocabular y (IEV)online.IEC Glossar y -st d.iec.ch/glossary 65 000 electrotechnical terminology entries in English and French ex tracted from the Ter ms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Cust omer Service Centre-webst ore.iec.ch/csc If you wish to give us y our feedback on this publication or need fur ther assistance,please contact the Customer Service Centre:csciec.ch.Copyright International Electrotechnical Commission IEC 62777 Edition 1.0 2016-02 INTERNA TIONA L STA NDA R D Quality evaluation method for the sound field of directional loudspeak er array systems INTER NA TIONAL ELECTROTECHNICAL COMMISSION ICS 33.160.50 ISBN 978-2-8322-3136-4 Registered t rademark of t he Int ernational Electrot echnical Commission W arning!Make sure that you obtained this publication from an authorized distributor.Copyright International Electrotechnical Commission 2 IEC 62777:2016 IEC 2016 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative ref erences.6 3 Terms and def initions.6 4 Personal acoustic zone and sound pressure level.7 4.1 Personal acoustic zone.7 4.2 Personal distance between listeners.8 4.3 Personal distance between a directional loudspeaker array system and a listener.8 4.4 Average sound pressure level at a personal acoustic zone.9 5 Personal acoustic zone index.9 5.1 General.9 5.2 PAZI-x.10 5.3 PAZI-y.10 5.4 PAZI-xy.10 5.5 PAZI-xyz.10 6 Measurement of the sound pressure level f or a personal acoustic zone.10 6.1 General.10 6.2 Characteristics to be specif ied.10 6.3 Method of measurement.11 6.3.1 Directional loudspeaker array system.11 6.3.2 Microphone.11 6.3.3 Test signals.11 6.3.4 Sound pressure level curves.11 6.4 Test environment condition.11 6.4.1 Temperature.11 6.4.2 Humidity.11 7 Indication of the characteristics to be specif ied.11 Annex A(inf ormative)Example of standard specif ications f or a personal audio space.13 Bibliography.14 Figure 1 Personal acoustic zone.8 Figure 2 Personal acoustic zone and sound pressure level.8 Figure 3 Measuring points of the personal acoustic zone.9 Table 1 Characteristics to be specif ied.12 Table A.1 Personal acoustic zone Dimensioned example.13 Copyright International Electrotechnical Commission IEC 62777:2016 IEC 2016 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ _ _ _ _ QUALITY EVALUATION METHOD FOR THE SOUND FIELD OF DIRECTIONAL LOUDSPEAKER ARRAY SYSTEMS FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees(IEC Na