IEC 62537:2010

Interface for loudspeakers with digital input signals based on IEC 60958

IEC 62537:2010 specifies the requirements for a digital loudspeaker interface based on the IEC 60958 series of standards and the MIDI specification. It maximizes flexibility and value by combining these previously separate standards. Together, the two standards provide a simple and flexible digital interface for loudspeakers. This bilingual version, published in 2010-09, corresponds to the English version. The French version of this standard has not been voted upon.

Interface pour haut-parleurs avec signaux d'entrée numériques basés sur la CEI 60958

La CEI 62537:2010 spécifie les exigences d'une interface pour haut-parleurs numériques basée sur la série de normes CEI 60958 et sur la norme MIDI. Elle optimise la souplesse et la valeur en combinant ces normes qui étaient précédemment distinctes. Les deux normes fournissent ensemble une interface numérique simple et souple pour haut-parleurs. La présente version bilingue, publiée en 2010-09, correspond à la version anglaise. La version française de cette norme n'a pas été soumise au vote.

General Information

• Status: Published
• Publication Date: 27-Jun-2010
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.160.30 - Audio systems
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: PPUB - Publication issued
• Start Date: 15-Sep-2010
• Completion Date: 28-Jun-2010

Standards Content (Sample)

IEC 62537 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
Interface for loudspeakers with digital input signals based on IEC 60958

All rights reserved. Unless otherwise specified, 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
either IEC or IEC's 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 for further information.

IEC Central Office
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CH-1211 Geneva 20
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Email: [e-mail]
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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.

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IEC 62537 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
Interface for loudspeakers with digital input signals based on IEC 60958

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 33.160.30; 35.040 ISBN 978-2-88912-033-8
– 2 – 62537 © IEC:2010(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms, definitions and abbreviations .7
3.1 Terms and definitions .7
3.2 Abbreviations .8
4 General .8
4.1 Feature set.8
4.2 Audio formats .9
5 Control data channel using the U-bit of IEC 60958-4 .9
5.1 General .9
5.2 Formatting.9
5.3 Mode indication .9
5.4 Subchannel usage.10
6 Loudspeaker command set.10
6.1 General .10
6.2 Device identification and configuration .10
6.2.1 Device identification .10
6.2.2 Auto configuration .11
6.3 Parameters .11
6.3.1 Parameter identification.11
6.3.2 Value range.11
6.3.3 Setting a parameter .12
6.3.4 Device addressing .12
6.3.5 Timed parameter setting (optional) .12
6.4 Optional alternative parameter setting through NRPN and/or MIDI controllers .12
6.4.1 General .12
6.4.2 NRPN and MIDI continuous controller association .12
6.5 Control numbers.13
6.5.1 General .13
6.5.2 MIDI channel assignment (control number 0, low resolution, optional) .13
6.5.3 Volume (control number 1, high resolution, mandatory) .14
6.5.4 Volume ramp (control number 2, high resolution, optional) .14
6.5.5 Time delay (control number 3, high resolution, optional) .14
6.5.6 Sample delay (control number 4, high resolution, optional) .14
6.5.7 Volume calibration (control number 5, high resolution, optional) .14
6.5.8 Panning (control number 6, high resolution, optional) .14
6.5.9 Phase left (control number 7, binary, optional).14
6.5.10 Phase right (control number 8, binary, optional).15
6.5.11 Dimming (control number 9, binary, optional).15
6.5.12 Indicator (control number 10, binary, optional).15
6.5.13 High-pass frequency (control number 11, high resolution, optional) .15
6.5.14 High-pass filter in/out (control number 12, binary, optional) .15
6.5.15 Low-pass frequency (control number 13, high resolution, optional) .15
6.5.16 Low-pass filter in/out (control number 14, binary, optional) .15

62537 © IEC:2010(E) – 3 –
6.6 Additional MIDI messages .15
6.6.1 General .15
6.6.2 All off and restore commands (mandatory).16
6.6.3 Program change (optional) .16
7 Power transmission and backward channel (optional) .16
7.1 Power transmission .16
7.2 Backwards data channel.17
7.2.1 General .17
7.2.2 Protocol.17
7.2.3 Simultaneous reception .17
Annex A (informative) Security aspects.18
Annex B (informative) Signal routing.21
Annex C (informative) Application examples .23
Annex D (informative) Implementation using current hardware.25
Bibliography.26

– 4 – 62537 © IEC:2010(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
INTERFACE FOR LOUDSPEAKERS WITH DIGITAL INPUT SIGNALS
BASED ON IEC 60958
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 62537 has been prepared by technical area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/1433/CDV 100/1700/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

62537 © IEC:2010(E) – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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.

– 6 – 62537 © IEC:2010(E)
INTRODUCTION
The IEC 60958 interface allows transmission of 2-channel digital audio with up to 24 bit word
length at 192 kHz sampling rate. This is adequate for loudspeakers, however, there are
additional needs in practice that require standardisation, which go beyond what's currently
defined in IEC 60958. This standard is aimed at fulfilling those needs.
IEC 60958 features a user bit that can form the basis of a control data channel that addresses
those additional requirements. The format of this user bit data channel is based on the
existi
...

IEC 62537 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Interface for loudspeakers with digital input signals based on IEC 60958

Interface pour haut-parleurs avec signaux d’entrée numériques basés sur la
CEI 60958
All rights reserved. Unless otherwise specified, 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 either IEC or
IEC's 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 for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
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 corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
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The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
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IEC 62537 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Interface for loudspeakers with digital input signals based on IEC 60958

Interface pour haut-parleurs avec signaux d’entrée numériques basés sur la
CEI 60958
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 33.160.30; 35.040 ISBN 978-2-88912-196-0
– 2 – 62537 © IEC:2010
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms, definitions and abbreviations .7
3.1 Terms and definitions .7
3.2 Abbreviations .8
4 General .8
4.1 Feature set.8
4.2 Audio formats .9
5 Control data channel using the U-bit of IEC 60958-4 .9
5.1 General .9
5.2 Formatting.9
5.3 Mode indication .9
5.4 Subchannel usage.10
6 Loudspeaker command set.10
6.1 General .10
6.2 Device identification and configuration .10
6.2.1 Device identification .10
6.2.2 Auto configuration .11
6.3 Parameters .11
6.3.1 Parameter identification.11
6.3.2 Value range.11
6.3.3 Setting a parameter .12
6.3.4 Device addressing .12
6.3.5 Timed parameter setting (optional) .12
6.4 Optional alternative parameter setting through NRPN and/or MIDI controllers .12
6.4.1 General .12
6.4.2 NRPN and MIDI continuous controller association .12
6.5 Control numbers.13
6.5.1 General .13
6.5.2 MIDI channel assignment (control number 0, low resolution, optional) .13
6.5.3 Volume (control number 1, high resolution, mandatory) .14
6.5.4 Volume ramp (control number 2, high resolution, optional) .14
6.5.5 Time delay (control number 3, high resolution, optional) .14
6.5.6 Sample delay (control number 4, high resolution, optional) .14
6.5.7 Volume calibration (control number 5, high resolution, optional) .14
6.5.8 Panning (control number 6, high resolution, optional) .14
6.5.9 Phase left (control number 7, binary, optional).14
6.5.10 Phase right (control number 8, binary, optional).15
6.5.11 Dimming (control number 9, binary, optional).15
6.5.12 Indicator (control number 10, binary, optional).15
6.5.13 High-pass frequency (control number 11, high resolution, optional) .15
6.5.14 High-pass filter in/out (control number 12, binary, optional) .15
6.5.15 Low-pass frequency (control number 13, high resolution, optional) .15
6.5.16 Low-pass filter in/out (control number 14, binary, optional) .15

62537 © IEC:2010 – 3 –
6.6 Additional MIDI messages .15
6.6.1 General .15
6.6.2 All off and restore commands (mandatory).16
6.6.3 Program change (optional) .16
7 Power transmission and backward channel (optional) .16
7.1 Power transmission .16
7.2 Backwards data channel.17
7.2.1 General .17
7.2.2 Protocol.17
7.2.3 Simultaneous reception .17
Annex A (informative) Security aspects.18
Annex B (informative) Signal routing.21
Annex C (informative) Application examples .23
Annex D (informative) Implementation using current hardware.25
Bibliography.26

– 4 – 62537 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
INTERFACE FOR LOUDSPEAKERS WITH DIGITAL INPUT SIGNALS
BASED ON IEC 60958
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 ens
...