Digital audio interface - Part 1: General

IEC 60958-1:2021 is available as IEC 60958-1:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60958-1:2021 describes a serial, uni-directional, self-clocking interface for the interconnection of digital audio equipment for consumer and professional applications. It provides the basic structure of the interface. Separate documents define items specific to particular applications. The interface is primarily intended to carry monophonic or stereophonic programmes, encoded using linear PCM and with a resolution of up to 24 bits per sample. When used for other purposes, the interface is able to carry audio data coded other than as linear PCM coded audio samples. Provision is also made to allow the interface to carry data related to computer software, multimedia technologies, or signals coded using non linear PCM. The format specification for these applications is not part of this document. The interface is intended for operation at audio sampling frequencies of 32 kHz and above. Auxiliary information is transmitted along with the programme. IEC 60958-1:2021c ancels and replaces the third edition published in 2008, and Amendment 1:2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) The relevant part of IEC 60958-5 is supported.

Digitalton-Schnittstelle - Teil 1: Allgemeines

Interface audionumérique - Partie 1: Généralités

IEC 60958-1:2021 est disponible sous forme de IEC 60958-1:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente. L'IEC 60958-1:2021 décrit une interface série unidirectionnelle et autosynchronisante pour l'interconnexion des appareils audionumériques destinés aux applications grand public et professionnelles. Elle fournit la structure de base de l'interface. Les points spécifiques à des applications particulières sont définis dans des documents distincts. Cette interface est essentiellement destinée à acheminer des programmes monophoniques ou stéréophoniques, qui utilisent un codage MIC linéaire et une résolution jusqu'à 24 bits par échantillon. Lorsqu'elle est utilisée à d'autres fins, cette interface est capable d'acheminer des données audio codées autres que des échantillons audio à codage MIC linéaire. Des dispositions ont également été prises pour permettre à l'interface d'acheminer des données relatives à des logiciels, des technologies multimédias ou des signaux à codage MIC non linéaire. La spécification du format de ces applications ne relève pas du présent document. L'interface est destinée à fonctionner à des fréquences d'échantillonnage audio supérieures ou égales à 32 kHz. Des informations auxiliaires sont transmises avec le programme. L'IEC 60958-1:2021 annule et remplace la troisième édition parue en 2008, et l'Amendement 1:2014. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) la partie pertinente de l'IEC 60958-5 est prise en compte.

Digitalni zvokovni vmesnik - 1. del: Splošno (IEC 60958-1:2021)

Ta del standarda IEC 60958 opisuje serijski, enosmerni vmesnik s samodejno sinhronizacijo za povezovanje digitalne avdio opreme za profesionalno in potrošniško uporabo.
Podaja osnovno strukturo vmesnika. V ločenih dokumentih so opredeljene postavke, značilne za posamezno vrsto uporabe.
Vmesnik je v prvi vrsti namenjen prenašanju enokanalnih ali večkanalnih programov, kodiranih prek linearnega zvoka PCM in ločljivostjo z največ 24 biti na vzorec.
Kadar se vmesnik uporablja za druge namene, lahko prenaša zvočne podatke, kodirane v drugi obliki, kot so zvočni vzorci z linearnim kodiranjem PCM. Predvideno je tudi, da se vmesniku omogoči prenašanje podatkov, povezanih z računalniško programsko opremo, večpredstavnostnih tehnologij ali signalov, kodiranih prek nelinearnega zvoka PCM.
Specifikacija oblik zapisa za tovrstne načine uporabe ni del tega dokumenta.
Vmesnik je namenjen delovanju pri frekvencah vzorčenja zvoka 32 kHz in višjih. Pomožne informacije se prenesejo skupaj s programom.

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Standards Content (Sample)

SIST EN 60958-1:2008
SIST EN 60958-1:2008/A1:2014
Digitalni zvokovni vmesnik - 1. del: Splošno (IEC 60958-1:2021)
Digital audio interface - Part 1: General (IEC 60958-1:2021)
Digitalton-Schnittstelle - Teil 1: Allgemeines (IEC 60958-1:2021)
Interface audionumérique - Partie 1: Généralités (IEC 60958-1:2021)
Ta slovenski standard je istoveten z: EN IEC 60958-1:2021
33.160.30 Avdio sistemi Audio systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.


October 2021
ICS 33.160.01 Supersedes EN 60958-1:2008 and all of its amendments
and corrigenda (if any)
English Version
Digital audio interface - Part 1: General
(IEC 60958-1:2021)
Interface audionumérique - Partie 1: Généralités Digitalton-Schnittstelle - Teil 1: Allgemeines
(IEC 60958-1:2021) (IEC 60958-1:2021)
This European Standard was approved by CENELEC on 2021-10-06. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60958-1:2021 E

European foreword
The text of document 100/3544/CDV, future edition 4 of IEC 60958-1, prepared by IEC/TC 100 “Audio,
video and multimedia systems and equipment” was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60958-1:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–07–06
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–10–06
document have to be withdrawn
This document supersedes EN 60958-1:2008 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60958-1:2021 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
IEC 60793-2 NOTE Harmonized as EN IEC 60793-2
IEC 60794-2 NOTE Harmonized as EN 60794-2
IEC 60874-1 (series) NOTE Harmonized as EN 60874-1 (series)
IEC 61883-6:2014 NOTE Harmonized as EN 61883-6:2014 (not modified)
IEC 62105:1999 NOTE Harmonized as EN 62105:2002 (not modified)
Annex ZA
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
Publication Year Title EN/HD Year
IEC 60268-11 1987 Sound system equipment - Part 11: HD 483.11 S3 1993
Application of connectors for the
interconnection of sound system
IEC 60958-3 - Digital audio interface - Part 3: Consumer - -
IEC 60958-4 series Digital audio interface - Part 4–1: EN 60958-4 series
Professional applications
IEC 60958-5 - Digital audio interface - Part 5: Consumer EN IEC 60958-5 -
application enhancement
IEC 60958-1 ®
Edition 4.0 2021-09
Digital audio interface –
Part 1: General
ICS 33.160.01 ISBN 978-2-8322-1017-0

– 2 – IEC 60958-1:2021 © IEC 2021
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Interface format . 8
4.1 Structure of format . 8
4.1.1 Sub-frame format . 8
4.1.2 Frame format . 9
4.2 Channel coding . 10
4.3 Preambles . 10
4.4 Validity bit . 11
5 Channel status . 11
5.1 General . 11
5.2 Applications . 11
5.3 General assignment of the first and second channel status bits . 11
5.4 Category code . 12
6 User data . 14
6.1 General . 14
6.2 Applications . 14
6.2.1 Professional use . 14
6.2.2 Consumer use . 14
7 Electrical requirement . 14
7.1 Consumer application . 14
7.1.1 General . 14
7.1.2 Timing accuracy . 14
7.1.3 Unbalanced line . 15
7.2 Professional application . 18
8 Optical requirements . 18
8.1 Consumer application . 18
8.1.1 Configuration of optical connection . 18
8.1.2 Optical connector . 18
8.2 Professional applications . 19
Annex A (informative) The use of the validity bit . 20
Annex B (informative) Application documents and specifications . 21
Annex C (informative) A relationship of the IEC 60958 series families . 22
Annex D (informative) Transmission of CD data other than linear PCM audio . 24
Annex E (informative) The IEC 60958 series conformant data format . 25
Annex F (informative) Stream change . 26
Annex G (informative) Characteristics of optical connection . 28
Bibliography . 30

Figure 1 – Sub-frame format (linear PCM application) . 9
Figure 2 – Frame format . 9
Figure 3 – Channel coding . 10

IEC 60958-1:2021 © IEC 2021 – 3 –
Figure 4 – Preamble M (shown as 11100010) . 11
Figure 5 – Simplified example of the configuration of the circuit (unbalanced) . 15
Figure 6 – Rise and fall times . 16
Figure 7 – Intrinsic jitter measurement filter . 16
Figure 8 – Eye diagram . 17
Figure 9 – Receiver jitter tolerance template . 17
Figure 10 – Basic optical connection . 18
Figure C.1 – Relationships of the IEC 60958 families . 22
Figure F.1 – Audio sources and AV receiver model . 26
Figure F.2 – Switching from linear PCM to non linear PCM . 26
Figure F.3 – Switching from non linear PCM to linear PCM . 27
Figure F.4 – Switching from non-linear PCM to non-linear PCM . 27

Table 1 – Preamble coding . 10
Table 2 – Channel status data format . 13
Table B.1 – Application documents and specifications . 21
Table C.1 – data_type values and application . 23
Table G.1 – Characteristics of standard optical connection (optical interface) . 28
Table G.2 – Characteristics of optical transmitter (optical interface) . 28
Table G.3 – Characteristics of optical receiver (optical interface) . 29
Table G.4 – Characteristics of fibre optic cable . 29
Table G.5 – Optical power budget for the link with plastic fibre . 29

– 4 – IEC 60958-1:2021 © IEC 2021
Part 1: General
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 electric

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