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IEC 60958-1
Edition 4.0 2021-09
INTERNATIONAL
STANDARD
Digital audio interface –
Part 1: General
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IEC 60958-1
Edition 4.0 2021-09
INTERNATIONAL
STANDARD
Digital audio interface –
Part 1: General
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.01 ISBN 978-2-8322-1017-0
– 2 – IEC 60958-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
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
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
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO INTERFACE –
Part 1: General
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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,
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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.
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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IEC 60958-1 has been prepared by technical area 20: Analogue and digital audio, of IEC
technical committee 100: Audio, video and multimedia systems and equipment. It is an
International Standard.
This fourth edition cancels 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.
...