IEC 62777:2016
(Main)Quality evaluation method for the sound field of directional loudspeaker array system
Quality evaluation method for the sound field of directional loudspeaker array system
IEC 62777:2016 determines of the performance of directional loudspeaker array systems, compares these system types, and determines their proper practical application, by listing the characteristics which are useful for their specification. It specifies uniform measurement methods for these characteristics.
Méthode d'évaluation de la qualité du champ acoustique des systèmes de haut-parleurs directionnels
L'IEC 62777:2016 s'applique à tous les types de systèmes de haut-parleurs directionnels, et aux parties dont ils sont composés ou qui sont utilisées comme auxiliaires dans ces systèmes.
La présente norme se rapporte à la détermination des performances des systèmes de haut-parleurs directionnels, à la comparaison de ces types de systèmes et à la détermination de leur application pratique respective, en dressant la liste des caractéristiques utiles pour leur spécification. Elle définit des méthodes de mesure uniformes pour ces caractéristiques.
La présente norme se limite à une description de l'espace audio qui entoure une personne et à la méthode de mesure correspondante. Elle ne considère pas les caractéristiques des haut-parleurs, qui sont spécifiées dans l'IEC 60268-5.
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IEC 62777 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
Quality evaluation method for the sound field of directional loudspeaker array
systems
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IEC 62777 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
Quality evaluation method for the sound field of directional loudspeaker array
systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.50 ISBN 978-2-8322-3136-4
– 2 – IEC 62777:2016 IEC 2016
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms 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 . 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 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 specified . 11
Annex A (informative) Example of standard specifications for 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 specified . 12
Table A.1 – Personal acoustic zone – Dimensioned example . 13
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 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 this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited 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 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 standard 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 Directives, 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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
INTRODUCTION
Directional loudspeaker array systems provide focused sound for a person to listen alone
without disturbing others. This system 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, museum, 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 products 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 systems.
– 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 such 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 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 following 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 system equipment – Part 1: General
IEC 60268-2, Sound system equipment
...
IEC 62777 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Quality evaluation method for the sound field of directional loudspeaker array
systems
Méthode d'évaluation de la qualité du champ acoustique des systèmes de
haut-parleurs directionnels
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Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
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IEC 62777 ®
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Quality evaluation method for the sound field of directional loudspeaker array
systems
Méthode d'évaluation de la qualité du champ acoustique des systèmes de
haut-parleurs directionnels
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.50 ISBN 978-2-8322-1029-8
– 2 – IEC 62777:2016 IEC 2016
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms 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 . 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 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 specified . 11
Annex A (informative) Example of standard specifications for 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 specified . 12
Table A.1 – Personal acoustic zone – Dimensioned example . 13
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 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 this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited 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 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 standard 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 Directives, 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
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
Directional lo
...
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