1、 IEC 62777 Edition 1.0 2016-02 INTERNATIONAL STANDARD Quality evaluation method for the sound field of directional loudspeaker array systems IEC 62777:2016-02(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part
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10、us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 62777 Edition 1.0 2016-02 INTERNATIONAL STANDARD Quality evaluation method for the sound field of directional loudspeaker array systems INTERNATIONAL ELECTROTECHNICAL COMMISSIO
11、N ICS 33.160.50 ISBN 978-2-8322-3136-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 62777:2016 IEC 2016 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references. 6 3 Te
12、rms and definitions 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 .
13、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 for a personal acoustic zone 10 6.1 General . 10 6.2 Characteristics to be specified . 10 6.3 Method of measurement 11 6.3.1 Directional louds
14、peaker 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 specified . 11 Annex A (informative) Example of standard specifications for a p
15、ersonal 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 specified . 12 Table A.1 Personal acoustic zone Dimensioned example . 13
16、 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 electr
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26、in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying
27、any or all such patent rights. International Standard IEC 62777 has been prepared by subcommittee subcommittee technical area 11: Quality for audio, video and multimedia systems, of IEC technical committee technical committee 100: Audio, video and multimedia systems and equipment. The text of this s
28、tandard is based on the following documents: FDIS Report on voting 100/2603/FDIS 100/2637/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directive
29、s, Part 2. 4 IEC 62777:2016 IEC 2016 The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be recon
30、firmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IEC 62777:2016 IEC 2016 5 INTRODUCTION Directional loudspeaker array systems provide focused sound for a person to listen alone without disturbing others. This system
31、is convenient for consumers who want to listen to sound without earphones or headphones. This system would be widely used in consumer electronics, for example, smart phone or pad, TV, computer, navigator, and game machine. The applicable area for the system could be fitness club, exhibition room, mu
32、seum, shopping mall, and etc. A simple and easy concept is needed to evaluate the performance of the directional loudspeaker array system for a consumer. It will provide consumers with personalized audio space criteria in order to compare the audio sound field quality between various electronic prod
33、ucts that have a directional loudspeaker array system. It is important to specify the quality evaluation method for the personal audio space and the concept of personal audio space. This standard provides guidelines for general test methods to evaluate the quality of directional loudspeaker array sy
34、stems. 6 IEC 62777:2016 IEC 2016 QUALITY EVALUATION METHOD FOR THE SOUND FIELD OF DIRECTIONAL LOUDSPEAKER ARRAY SYSTEMS 1 Scope This International Standard applies to directional loudspeaker array systems of any kind, and to the parts of which they are composed or which are used as auxiliaries in su
35、ch systems. This standard deals with the determination of the performance of directional loudspeaker array systems, the comparison of these system types, and the determination of their proper practical application, by listing the characteristics which are useful for their specification. It specifies
36、 uniform measurement methods for these characteristics. This standard is restricted to a description of the audio space around a person and the relevant method of measurement. It does not consider characteristics of loudspeakers, which are specified in IEC 60268-5. 2 Normative references The followi
37、ng documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60268-1, Sound
38、 system equipment Part 1: General IEC 60268-2, Sound system equipment Part 2: Explanation of general terms and calculation methods IEC 60268-5, Sound system equipment Part 5: Loudspeakers IEC 61672-1, Electroacoustics Sound level meters Part 1: Specifications 3 Terms and definitions For the purposes
39、 of this document, the following terms and definitions apply. 3.1 personal acoustic zone PAZ acoustic space occupied by a person 3.2 personal distance distance between listeners and a directional loudspeaker array system 3.3 sound pressure level at a personal acoustic zone ij P sound pressure level
40、measured at the center of the surface j of the personal acoustic zone i IEC 62777:2016 IEC 2016 7 3.4 average sound pressure level at a personal acoustic zone i P mean value of the sound pressure levels measured at the centers of the surfaces of the personal acoustic zone i 3.5 personal acoustic zon
41、e index PAZI ratio of the average sound pressure level of the personal acoustic zone for a listener, to the total average sound pressure levels for listeners around the directional loudspeaker array system located at a specified personal distance 3.6 personal acoustic zone index-x PAZI-x ratio of th
42、e average sound pressure level of the personal acoustic zone of a listener in front of the directional loudspeaker array system to the sum of the average sound pressure levels of listeners at the front, the front-right, and the front-left of the system 3.7 personal acoustic zone index-y PAZI-y ratio
43、 of the average sound pressure level of the personal acoustic zone of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of listeners at the front and the rear of the system 3.8 personal acoustic zone index-xy PAZI-xy ratio of the
44、average sound pressure level of the personal acoustic zone of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of listeners at the front, the front-right, the front-left and the rear of the system 3.9 personal acoustic zone index
45、-xyz PAZI-xyz ratio of the average sound pressure level of the personal acoustic zone of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of persons at the front, the front-right, the front-left, and the rear, and the front-upper
46、, and the front-lower of the system 4 Personal acoustic zone and sound pressure level 4.1 Personal acoustic zone The personal acoustic zone (PAZ) is defined as an acoustic space occupied by a person as shown in Figure 1. The dimensions of the personal acoustic zone are defined as W (width), D (depth
47、), and H (height). Considering the standard size of a person, the dimensions of the personal acoustic zone shall be stated. 8 IEC 62777:2016 IEC 2016 Figure 1 Personal acoustic zone 4.2 Personal distance between listeners The personal distance between separate listeners, x and z, shall be defined as
48、 the distance between the centres of their personal acoustic zones, see Figure 2. Considering the standard size of a person, the dimension of the personal distance between listeners shall be stated. Figure 2 Personal acoustic zone and sound pressure level 4.3 Personal distance between a directional
49、loudspeaker array system and a listener The personal distance between a directional loudspeaker array system and a listener, y, shall be defined as a distance from the centre of the directional loudspeaker array system to the IEC x +x +z z +y y z y x P RP UP LP FP DP BDirectional loudspeaker array system IEC W D H IEC 62777:2016 IEC 2016 9 listener in front of the system, as shown in Figure 2. The personal distance shall be specified by the target application area of the directional l
