Digital audio interface - Part 5: Consumer application enhancement (IEC 60958-5:2021)

This part of IEC 60958 enhances the consumer application of the interface for the
interconnection of digital audio equipment defined in IEC 60958-1 and IEC 60958-3, introducing:
– multichannel;
– multi-stream;
– high-resolution;
– multimedia extension;
– related applications.
NOTE IEC 60958-3 specifies a consumer application to carry stereophonic programmes with a resolution of up to
24 bits per sample. This part of IEC 60958 enhances the application, allowing programmes with up to 64 channels,
64 bits per sample, and two simultaneous streams.

Digitalton-Schnittstelle - Teil 5: Verbesserungen für den Allgemeingebrauch (IEC 60958-5:2021)

Interface audionumérique - Partie 5: Amélioration de l'application grand public (IEC 60958-5:2021)

L'IEC 60958-5:2021 a pour objet d'améliorer l'application grand public de l'interface destinée à l'interconnexion des appareils audionumériques définis dans l'IEC 60958-1 et l'IEC 60958-3, en introduisant les améliorations suivantes: - voies multiples; - multiflux; - haute résolution; - extension multimédia; - applications connexes.

Digitalni avdio vmesnik - 5. del: Izboljšanje potrošniških aplikacij (IEC 60958-5:2021)

General Information

Status
Published
Public Enquiry End Date
30-Oct-2020
Publication Date
15-Nov-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Mar-2021
Due Date
21-May-2021
Completion Date
16-Nov-2021

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SLOVENSKI STANDARD
SIST EN IEC 60958-5:2021
01-december-2021
Digitalni avdio vmesnik - 5. del: Izboljšanje potrošniških aplikacij (IEC 60958-
5:2021)

Digital audio interface - Part 5: Consumer application enhancement (IEC 60958-5:2021)

Digitalton-Schnittstelle - Teil 5: Verbesserungen für den Allgemeingebrauch (IEC 60958-

5:2021)

Interface audionumérique - Partie 5: Amélioration de l'application grand public (IEC

60958-5:2021)
Ta slovenski standard je istoveten z: EN IEC 60958-5:2021
ICS:
33.160.30 Avdio sistemi Audio systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST EN IEC 60958-5:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60958-5:2021
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SIST EN IEC 60958-5:2021
EUROPEAN STANDARD EN IEC 60958-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2021
ICS 33.160.01; 33.160.30
English Version
Digital audio interface - Part 5: Consumer application
enhancement
(IEC 60958-5:2021)

Interface audionumérique - Partie 5: Amélioration de Digitalton-Schnittstelle - Teil 5: Verbesserungen für den

l'application grand public Allgemeingebrauch
(IEC 60958-5:2021) (IEC 60958-5:2021)

This European Standard was approved by CENELEC on 2021-03-10. 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 60958-5:2021 E
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SIST EN IEC 60958-5:2021
EN IEC 60958-5:2021 (E)
European foreword

The text of document 100/3449/CDV, future edition 1 of IEC 60958-5, 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 60958-5:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-12-10

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024-03-10

document have to be withdrawn

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.

Endorsement notice

The text of the International Standard IEC 60958-5:2021 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

indicated:
ISO 9241-910:2011 NOTE Harmonized as EN ISO 9241-910:2011 (not modified)
IEC 61883-6:2014 NOTE Harmonized as EN 61883-6:2014 (not modified)
IEC 62574:2011 NOTE Harmonized as EN 62574:2011 (not modified)
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SIST EN IEC 60958-5:2021
EN IEC 60958-5:2021 (E)
Annex ZA
(normative)
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)

applies.

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

here: www.cenelec.eu.
Publication Year Title EN/HD Year
1 2
IEC 60958-1 — Digital audio interface - Part 1: General EN IEC 60958-1 —
(TA 20)
3 4
IEC 60958-3 — Digital audio interface - Part 3: Consumer EN IEC 60958-3 —
applications (TA 20)
IEC 62574 2020 Audio, video and multimedia systems - - -
General channel assignment of
multichannel audio
ISO/IEC 23001-8 2016 Information technology - MPEG systems - -
technologies - Part 8:
Codingindependent code points
ITU-R BS.2094-1 2017 Common definitions for the audio - -
definition model
ITU-R BS.2051-2 2018 Advanced sound system for programme - -
production
Under preparation. Stage at the time of publication: IEC CCDV 60958-1:2021.
Under preparation. Stage at the time of publication: prEN IEC 60958-1:2021.
Under preparation. Stage at the time of publication: IEC CCDV 60958-3:2021.
Under preparation. Stage at the time of publication: prEN IEC 60958-3:2021.

This publication was withdrawn and replaced with ISO/IEC 23091-3:2018, ISO/IEC 23091-1:2018 and ISO/IEC

23091-2:2019.
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SIST EN IEC 60958-5:2021
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SIST EN IEC 60958-5:2021
IEC 60958-5
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio interface –
Part 5: Consumer application enhancement
Interface audionumérique –
Partie 5: Amélioration de l'application grand public
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.01; 33.160.30 ISBN 978-2-8322-9325-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60958-5:2021
– 2 – IEC 60958-5:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Interface format ............................................................................................................... 9

5 Operation modes ............................................................................................................. 9

5.1 General ................................................................................................................... 9

5.2 Multichannel linear PCM operation mode ................................................................ 9

5.3 One-bit audio operation mode ............................................................................... 10

5.4 High-precision multi-bit linear audio operation mode ............................................. 11

6 Channel status .............................................................................................................. 12

6.1 General ................................................................................................................. 12

6.2 Application ............................................................................................................ 12

6.2.1 Channel status general format ....................................................................... 12

6.2.2 Mode 0 channel status format for digital audio equipment for enhanced

consumer use ................................................................................................ 13

7 Stream change .............................................................................................................. 16

Annex A (informative) Audio and vibrotactile applications ................................................... 17

A.1 General ................................................................................................................. 17

A.2 Channel assignments of vibrotactile signals .......................................................... 17

Annex B (informative) Audio and MIDI application ............................................................... 19

B.1 General ................................................................................................................. 19

B.2 Audio and MIDI 2.0 application ............................................................................. 19

Bibliography .......................................................................................................................... 20

Figure 1 – Example: multichannel group and subgroups ....................................................... 10

Figure 2 – One-bit audio subframe ........................................................................................ 11

Figure 3 – 32/64-bit mode subframe...................................................................................... 11

Figure 4 – 32-bit mode frame ................................................................................................ 11

Figure 5 – 64-bit mode frame ................................................................................................ 12

Figure 6 – Switching from one linear PCM audio mode to the other linear PCM audio

mode .................................................................................................................................... 16

Figure B.1 – Subframe format ............................................................................................... 19

Table 1 – Example: multichannel group and subgroups ......................................................... 10

Table 2 – Mode 0 channel status format for enhanced consumer use.................................... 13

Table 3 – Multichannel configuration ..................................................................................... 15

Table A.1 – Vibrotactile channel assignments ....................................................................... 17

Table B.1 – Audio and MIDI 2.0 order ................................................................................... 19

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IEC 60958-5:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO INTERFACE –
Part 5: Consumer application enhancement
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.

IEC 60958-5 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.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3449/CDV 100/3517/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.
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– 4 – IEC 60958-5:2021 © IEC 2021

A list of all parts in the IEC 60958 series, published under the general title Digital audio interface,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN IEC 60958-5:2021
IEC 60958-5:2021 © IEC 2021 – 5 –
INTRODUCTION

IEC 60958-3 edition 1.0 was released in 1999 specifying the consumer applications of the

interface for the inter-connection of digital audio equipment defined in IEC 60958-1. The

applications have enhanced their quality including multichannel modes, high-precision bit length,

and multi-stream modes. These enhancements imply a new part in the IEC 60958 series,

appropriately keeping backward compatibility with IEC 60958-3 and providing a new enhanced

digital audio interface.
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SIST EN IEC 60958-5:2021
– 6 – IEC 60958-5:2021 © IEC 2021
DIGITAL AUDIO INTERFACE –
Part 5: Consumer application enhancement
1 Scope

This part of IEC 60958 enhances the consumer application of the interface for the

interconnection of digital audio equipment defined in IEC 60958-1 and IEC 60958-3, introducing:

– multichannel;
– multi-stream;
– high-resolution;
– multimedia extension;
– related applications.

NOTE IEC 60958-3 specifies a consumer application to carry stereophonic programmes with a resolution of up to

24 bits per sample. This part of IEC 60958 enhances the application, allowing programmes with up to 64 channels,

64 bits per sample, and two simultaneous streams.
2 Normative references

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) applies.
IEC 60958-1:20— , Digital audio interface – Part 1: General
IEC 60958-3:20— , Digital audio interface – Part 3: Consumer applications

IEC 62574:2020, Audio, video and multimedia systems – General channel assignment of

multichannel audio

ISO/IEC 23001-8:2016, Information technology – MPEG systems technologies – Part 8: Coding-

independent code points
ITU-R BS.2094-1:2017, Common definitions for the audio definition model
ITU-R BS.2051-2:2018, Advanced sound system for programme production
—————————
Under preparation. Stage at the time of publication: IEC CCDV 60958-1:2021.
Under preparation. Stage at the time of publication: IEC CCDV 60958-3:2021.

This publication was withdrawn and replaced with ISO/IEC 23091-3:2018, ISO/IEC 23091-1:2018 and ISO/IEC

23091-2:2019.
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SIST EN IEC 60958-5:2021
IEC 60958-5:2021 © IEC 2021 – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
one-bit audio
one-bit length audio data stream

Note 1 to entry: A one-bit audio data stream can be directly played back through the analogue low-pass filter bit by

bit (MSB first).
3.2
high-precision multi-bit linear audio
linear PCM audio data longer than 25 bits length per sample
Note 1 to entry: This document supports 32- and 64-bit lengths.
3.3
sampling frequency
frequency of the samples representing an audio signal.

Note 1 to entry: When more than one signal is transmitted through the same interface, the sampling frequencies

are identical.
[SOURCE: IEC 60958-1:20—, 3.1]
3.4
audio sample word
value of a digital audio sample
Note 1 to entry: Representation is linear in 2's complement binary form.

Note 2 to entry: Positive numbers correspond to positive analogue voltages at the input of the analogue-to-digital

converter (ADC).
[SOURCE: IEC 60958-1: 20—, 3.2]
3.5
channel status

data carrying, in a fixed format, information associated with each main data field channel, which

is decodable by any interface user.

Note 1 to entry: IEC 60958-3 specifies the mode 0 channel status format for digital audio equipment for consumer

use.
EXAMPLE 1 Length of audio sample words.
EXAMPLE 2 Sampling frequency.

[SOURCE: IEC 60958-1:20—, 3.5, modified – Modification of the Note to entry, and addition of

two examples.]
3.6
preamble
specific patterns used for synchronization.
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Note 1 to entry: There are three different preambles: “B”; “M”; and “W”.
[SOURCE: IEC 60958-1:20—, 3.8, modified – Modification of the Note to entry.]
3.7
sub-frame
fixed structure used to carry information
[SOURCE: IEC 60958-1:20—, 3.9]
3.8
frame
sequence of two successive and associated sub-frames
[SOURCE: IEC 60958-1:20—, 3.10]
3.9
block
group of 192 consecutive frames

Note 1 to entry: The start of a block is designated by a special sub-frame preamble.

[SOURCE: IEC 60958-1:20—, 3.11]
3.10
channel number
number that shows channel order in two-channel operation mode
3.11
channel label ID
label of ID
[SOURCE: IEC 62574:2020, 3.73]
3.11.1
multichannel number
number that identifies multichannel addressing
Note 1 to entry: Same as IEC 62574 channel number
3.12
multichannel group
group composed of one or two multichannel subgroups
3.13
multichannel count
count of channels in a multichannel group
3.14
multichannel subgroup
subgroup, in a multichannel group, composed of several multichannel

Note 1 to entry: Multichannel subgroup A is set according to multichannel configuration.

Note 2 to entry: Multichannel subgroup B is set according to multichannel map.
3.15
multichannel configuration
configuration of multichannel addressing
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IEC 60958-5:2021 © IEC 2021 – 9 –
3.16
multichannel order
order of multichannel in a multichannel group
3.17
multichannel map
map of multichannel selections
4 Interface format

The interface format as defined in IEC 60958-1 and IEC 60958-3 shall be used unless otherwise

specified in this document.
5 Operation modes
5.1 General

IEC 60958-1 specifies single- and two-channel operation modes. This document introduces

several new operation modes based on the same interface format of IEC 60958-1 without the

pre-emphasis function defined in IEC 60958-3. Channel status information identifies these

modes in operation. This document shares the information with IEC 60958-1 and IEC 60958-3

and specifies new usages.
5.2 Multichannel linear PCM operation mode

In multichannel linear PCM operation mode, the samples taken from multichannel linear PCM

are transmitted by time multiplexing in consecutive sub-frames.

A multichannel group is composed of several multichannel by consecutive frames. The number

of multichannels included in the group is identified by the multichannel count of channel status

bits 44 to 47. The group starts with preamble “B” and repeats itself with no break in the block

and without un-grouped frames. The group is divided into one or two multichannel subgroups

by the multichannel configuration of channel status bits 49 to 60 and the multichannel map of

channel status bits 64 to 165. The subgroup is composed of some specific multichannels by

consecutive sub-frames. Each multichannel within the multichannel subgroup B is re-numbered

according to the multichannel number of channel status bits 64 to 165. Each channel carries

consecutive audio sample words.

An example is shown in Figure 1 and Table 1. The multichannel group is composed of eight

multichannels. This number of eight is identified by the multichannel count value of “1110”. The

multichannel subgroup A is composed of three multichannels identified by the multichannel

configuration value of “100001010000”, which includes FrontLeft channel, FrontRight channel

and FrontCenter channel given in ITU-R BS.2094-1. The multichannel subgroup B is composed

of the 77 multichannel (channel label ID name of HFL) and 78th multichannel (channel label

ID name of HFR) by setting the channel status bit 77 to “1” and the channel status bit 78 to “1”.

Channels of multichannel order 6, 7 and 8 are not used in this example.
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Figure 1 – Example: multichannel group and subgroups

The sampling frequency of each audio multichannel is identical and identified by the original

sampling frequency of channel status bits 36 to 39. The sampling frequency of channel status

bits 24 to 27, 30 and 31 identifies the IEC 60958 frame rate in operation.
Table 1 – Example: multichannel group and subgroups
Preamble Channel Multichannel Multichannel Multichannel subgroup B
number order subgroup A
ITU-R BS.2094-1; Multichannel map C‑Bit 64‑191;
audioPackFormatID, Multichannel number value:
audioChannelNames Channel label ID name
B 1 1 AP_0001000a
FrontLeft
W 2 2
FrontRight
M 1 3 FrontCenter
W 2 4 77: HFL
M 1 5 78: HFR
W 2 6
M 1 7
W 2 8
M 1 1 AP 0001000a
FrontLeft
W 2 2
FrontRight
M 1 3 FrontCenter
W 2 4 77: HFL
M 1 5 78: HFR
W 2 6
M 1 7
W 2 8
M 1 1 AP_0001000a
⁞ ⁞ ⁞ ⁞ ⁞
M 1 7
W 2 8
AP 0001000a
B 1 1
FrontLeft
M 2 2
FrontRight
W 1 3 FrontCenter
5.3 One-bit audio operation mode

In one-bit audio operation mode, the samples taken from multichannel one-bit audio stream are

transmitted by time multiplexing in consecutive sub-frames. The sub-frame format is shown in

Figure 2.
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IEC 60958-5:2021 © IEC 2021 – 11 –
Figure 2 – One-bit audio subframe

Time slots 4 to 19 carry on-bit audio samples composed of 16 bits of the consecutive one-bit

audio stream. Significant bit (MSB) is carried by time slot 19.

Time slots 20 to 17 are not used; they are filled with zeros or a few fixed patterns and ignored.

The frame format as defined in multichannel linear PCM operation mode is used for

multichannel one-bit audio operation mode.

The sampling frequency of each one-bit audio channel is identical and identified by the original

sampling frequency of the channel status bits 36 to 39, which is 16 multiples of that of the

multichannel linear PCM. The sampling frequency of channel status bits 24 to 27, 30 and 31

identifies the IEC 60958 frame rate in operation. IEC 60958-3 defines the original sampling

frequency where one-bit audio multiples 16 and sampling frequency as the IEC 60958 frame

rate.
5.4 High-precision multi-bit linear audio operation mode

In the high-precision multi-bit linear audio operation mode, the samples taken from the

multichannel high-precision multi-bit linear audio are transmitted by time multiplexing in

consecutive sub-frames dividing of word. The sub-frame format of 32/64-bit mode is shown in

Figure 3. The frame formats are shown in Figure 4 and Figure 5.
Figure 3 – 32/64-bit mode subframe

In 32-bit audio operation mode, time slots 4 to 19 carry 16-bit samples of 32-bit audio words.

Significant bit (MSB) is carried by time slot 19. Time slots 20 to 17 are not used; they are filled

with zeros or a few fixed patterns and ignored.
Figure 4 – 32-bit mode frame

The frame format as defined in the multichannel linear PCM operation mode is used for

multichannel 32-bit operation modes.
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The original sampling frequency for the 32-bit mode corresponds to 1/2 of that of the

multichannel linear PCM.

In 64-bit audio operation mode, time slots 4 to 19 carry 16-bit samples of 64-bit audio words.

Most significant bit (MSB) is carried by time slot 19. Time slots 20 to 17 are not used; they are

filled with zeros or a few fixed patterns and ignored.
Figure 5 – 64-bit mode frame

The frame format as defined in the multichannel linear PCM operation mode is used for

multichannel 64-bit operation modes.

The original sampling frequency for 64-bit mode corresponds to 1/4 of that of the multichannel

linear PCM.
6 Channel status
6.1 General

The channel status format as defined in IEC 60958-1 and IEC 60958-3 shall be used unless

this document specifies.
6.2 Application
6.2.1 Channel status general format

For each IEC 60958-5 channel, the channel status block provides the information described in

this clause and summarized in Table 2.
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IEC 60958-5:2021 © IEC 2021 – 13 –
6.2.2 Mode 0 channel status format for digital audio equipment for enhanced
consumer use
Table 2 – Mode 0 channel status format for enhanced consumer use
Byte
0 a = “0” b = “0” c D Mode = “0 0”
“0 0 1”: Multichannel LPCM
“0 1 1”: refer to bit 32-35
bit 0 1 2 3
...

SLOVENSKI STANDARD
oSIST prEN IEC 60958-5:2020
01-oktober-2020
Digitalni avdio vmesnik - 5. del: Izboljšanje potrošniških aplikacij (TA 20)
Digital audio interface - Part 5: Consumer application enhancement (TA 20)
Ta slovenski standard je istoveten z: prEN IEC 60958-5:2020
ICS:
33.160.30 Avdio sistemi Audio systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
oSIST prEN IEC 60958-5:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 60958-5:2020
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oSIST prEN IEC 60958-5:2020
100/3449/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60958-5 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2020-08-07 2020-10-30
SUPERSEDES DOCUMENTS:
100/3321/CD, 100/3384/CC
IEC TA 20 : ANALOGUE AND DIGITAL AUDIO
SECRETARIAT: SECRETARY:
Japan Mr Gen Ichimura
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
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SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of

which they are aware and to provide supporting documentation.
TITLE:
Digital audio interface - Part 5: Consumer application enhancement (TA 20)
PROPOSED STABILITY DATE: 2023
NOTE FROM TC/SC OFFICERS:

Copyright © 2020 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
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1 CONTENTS

3 FOREWORD ........................................................................................................................... 3

4 INTRODUCTION ..................................................................................................................... 5

5 1 Scope .............................................................................................................................. 6

6 2 Normative references ...................................................................................................... 6

7 3 Terms and definitions ...................................................................................................... 6

8 4 Interface format ............................................................................................................... 9

9 5 Operation modes ............................................................................................................. 9

10 5.1 General ................................................................................................................... 9

11 5.2 Multichannel linear PCM operation mode ................................................................ 9

12 5.3 One-bit audio operation mode ............................................................................... 11

13 5.4 High-precision multi-bit linear audio operation mode ............................................. 11

14 6 Channel status .............................................................................................................. 12

15 6.1 General ................................................................................................................. 12

16 6.2 Application ............................................................................................................ 12

17 6.2.1 Channel status general format ....................................................................... 12

18 6.2.2 Mode 0 channel status format for digital audio equipment for enhanced

19 consumer use ................................................................................................ 13

20 7 Stream change .............................................................................................................. 16

21 Annex A (informative) Audio and vibrotactile applications .................................................... 17

22 A.1 General ................................................................................................................. 17

23 A.2 Channel assignments of vibrotactile signals .......................................................... 17

24 Annex B (informative) Audio and MIDI application ................................................................ 19

25 B.1 General ................................................................................................................. 19

26 B.2 Audio and MIDI 2.0 application ............................................................................. 19

28 Figure 1 – Example: multichannel group and subgroups ....................................................... 10

29 Figure 2 – One-bit audio subframe ........................................................................................ 11

30 Figure 3 – 32/64-bit mode subframe ..................................................................................... 11

31 Figure 4 – 32-bit mode frame ................................................................................................ 12

32 Figure 5 – 64-bit mode frame ................................................................................................ 12

33 Figure 6 – Switching from one linear PCM audio mode to the other linear PCM audio

34 mode .................................................................................................................................... 16

35 Figure B.1 – subframe format................................................................................................ 19

37 Table 1 – Example: multichannel group and subgroups ......................................................... 10

38 Table 2 – Mode 0 channel status format for enhanced consumer use ................................... 13

39 Table 3 – Multichannel configuration ..................................................................................... 15

40 Table A.1 – Vibrotactile channel assignments ....................................................................... 17

41 Table B.1 – Audio and MIDI 2.0 order ................................................................................... 19

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44 INTERNATIONAL ELECTROTECHNICAL COMMISSION
45 ____________
47 DIGITAL AUDIO INTERFACE –
49 Part 5: Consumer application enhancement
51 FOREWORD

52 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

53 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

54 international co-operation on all questions concerning standardization in the electrical and electronic fields. To

55 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

56 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

57 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

58 in the subject dealt with may participate in this preparatory work. International, governmental and non-

59 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

60 with the International Organization for Standardization (ISO) in accordance with conditions determined by

61 agreement between the two organizations.

62 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

63 consensus of opinion on the relevant subjects since each technical committee has representation from all

64 interested IEC National Committees.

65 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

66 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

67 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

68 misinterpretation by any end user.

69 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

70 transparently to the maximum extent possible in their national and regional publications. Any divergence

71 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

72 the latter.

73 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

74 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

75 services carried out by independent certification bodies.

76 6) All users should ensure that they have the latest edition of this publication.

77 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

78 members of its technical committees and IEC National Committees for any personal injury, property damage or

79 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

80 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

81 Publications.

82 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

83 indispensable for the correct application of this publication.

84 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

85 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

86 International Standard IEC 60958-5 has been prepared by Technical Area 20: Analogue and

87 digital audio, of IEC Technical Committee 100: Audio, video and multimedia systems and

88 equipment.
90 The text of this International Standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD

92 Full information on the voting for the approval of this International Standard can be found in

93 the report on voting indicated in the above table.
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94 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

95 The committee has decided that the contents of this document will remain unchanged until the

96 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

97 the specific document. At this date, the document will be
98 • reconfirmed,
99 • withdrawn,
100 • replaced by a revised edition, or
101 • amended.
102

103 The National Committees are requested to note that for this document the stability date

104 is 20XX..

105 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE

106 DELETED AT THE PUBLICATION STAGE.
107
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108 INTRODUCTION

109 IEC 60958-3 edition 1.0 was released in 1999 specifying the consumer applications of the

110 interface for the inter-connection of digital audio equipment defined in IEC 60958-1. The

111 applications have enhanced their quality including multichannel modes, high-precision bit

112 length, multi-stream modes. These enhancements require a new part of IEC 60958

113 appropriately keeping backward compatibility with IEC 60958-3 and providing a new enhanced

114 digital audio interface.
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115 DIGITAL AUDIO INTERFACE –
116
117 Part 5: Consumer application enhancement
118
119 1 Scope

120 This part of IEC 60958 enhances the consumer application of the interface for the

121 interconnection of digital audio equipment defined in IEC 60958-1 and IEC 60958-3

122 introducing:
123 – multichannel;
124 – multi-stream;
125 – high-resolution;
126 – multimedia extension;
127 – related applications.

128 NOTE: IEC 60958-3 specifies consumer application to carry stereophonic programmes with a resolution of up to 24

129 bits per sample. This part of IEC 60958 enhances them up to 64 channels programs, 64 bits per sample and two

130 simultaneous streams.
131 2 Normative references

132 The following documents are referred to in the text in such a way that some or all of their

133 content constitutes requirements of this document. For dated references, only the edition

134 cited applies. For undated references, the latest edition of the referenced document (including

135 any amendments) applies.
136 IEC 60958-1:2021 (under revision), Digital audio interface – Part 1: General

137 IEC 60958-3:2021 (under revision), Digital audio interface – Part 3: Consumer applications

138 IEC 61883-6: 2014, Consumer Audio/Video Equipment – Digital Interface – Part 6: Audio and

139 music data transmission protocol

140 IEC 62574:2020, Audio, video and multimedia systems – General channel assignment of

141 multichannel audio
142 ITU-R BS.2094-1: 2017, Common definitions for the audio definition model

143 ITU-R BS.775-3: 2012, Multichannel stereophonic sound system with and without

144 accompanying picture
145 ITU-R BS.2051-2: 2018, Advanced sound system for programme production

146 ISO/IEC 23001-8: 2016, Information technology — MPEG systems technologies — Part 8:

147 Coding independent code points, AMENDMENT 1: Additional audio code points
148 3 Terms and definitions

149 For the purposes of this document, the following terms and definitions apply.

150 ISO and IEC maintain terminological databases for use in standardization at the following

151 addresses:
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152 • IEC Electropedia: available at http://www.electropedia.org/
153 • ISO Online browsing platform: available at http://www.iso.org/obp
154 3.1
155 one-bit audio
156 one-bit length audio data stream

157 Note 1 to entry: One-bit audio data stream can be directly played back through the analogue low pass filter bit by

158 bit (MSB first).
159 [SOURCE: IEC 61883-6: 2014, 12.1.3]
160 3.2
161 high-precision multi-bit linear audio
162 linear PCM audio data longer than 25 bits length per sample
163 Note 1 to entry: This part of IEC 60958 supports 32- and 64-bits length.
164 [SOURCE: IEC 61883-6: 2014, 8.2.8]
165 3.3
166 sampling frequency
167 frequency of the samples representing an audio signal.

168 Note 1 to entry: When more than one signal is transmitted through the same interface, the sampling frequencies

169 are identical.
170 [SOURCE: IEC 60958-1: 2021]
171 3.4
172 audio sample word

173 value of a digital audio sample. Representation is linear in 2's complement binary form.

174 Note 1 to entry: Positive numbers correspond to positive analogue voltages at the input of the analogue-to-digital

175 converter (ADC).
176 [SOURCE: IEC 60958-1: 2021]
177 3.5
178 channel status

179 data carrying, in a fixed format, information associated with each main data field channel,

180 which is decodable by any interface user.

181 Note 1 to entry: IEC 60958-3 specifies Mode 0 channel status format for digital audio equipment for consumer use.

182 EXAMPLE 1 Length of audio sample words
183 EXAMPLE 2 Sampling frequency
184 [SOURCE: IEC 60958-1: 2021]
185 3.6
186 preamble
187 specific patterns used for synchronization.
188 Note 1 to entry: There are three different preambles: “B”; “M”; and “W”.
189 [SOURCE: IEC 60958-1: 2021]
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190 3.7
191 sub-frame
192 fixed structure used to carry information
193 [SOURCE: IEC 60958-1: 2021]
194 3.8
195 frame
196 sequence of two successive and associated sub-frames
197 [SOURCE: IEC 60958-1: 2021]
198 3.9
199 block
200 group of 192 consecutive frames.

201 Note 1 to entry: The start of a block is designated by a special sub-frame preamble.

202 [SOURCE: IEC 60958-1: 2021]
203 3.10
204 channel number
205 number that shows channel order in two channel operation mode
206 [SOURCE: IEC 60958-1: 2021]
207 3.11
208 channel label ID
209 label of ID
210 [SOURCE: IEC 62574: 2020]
211 3.11.1
212 multichannel number
213 number that identifies multichannel addressing
214 Note 1 to entry: Same as IEC 62574 channel number
215 [SOURCE: IEC 62574: 2019, 4.3]
216 3.12
217 multichannel group
218 group composed of one or two multichannel subgroups
219 3.13
220 multichannel count
221 count of channels in a multichannel group
222 3.14
223 multichannel subgroup
224 subgroup, in a multichannel group, composed of several multichannel

225 Note 1 to entry: Multichannel subgroup A is set according to multichannel configuration.

226 Note 2 to entry: Multichannel subgroup B is set according to multichannel map.

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227 3.15
228 multichannel configuration
229 configuration of multichannel addressing
230 3.16
231 multichannel order
232 order of multichannel in a multichannel group
233 3.17
234 multichannel map
235 map of multichannel selections
236 4 Interface format

237 The interface format as defined in IEC 60958-1 and IEC 60958-3 shall be used unless

238 otherwise specified in this part of IEC 60958.
239 5 Operation modes
240 5.1 General

241 IEC 60958-1 specifies single and two channel operation modes. This part of IEC 60958

242 introduces several new operation modes based on the same interface format of IEC 60958-1

243 without pre-emphasis function as defined in IEC 60958-3. Channel status information

244 identifies these modes in operation. This part of IEC 60958 shares the information with IEC

245 60958-1 and IEC 60958-3 and specifies new usages.
246 5.2 Multichannel linear PCM operation mode

247 In multichannel linear PCM operation mode, the samples taken from multichannel linear PCM

248 are transmitted by time multiplexing in consecutive sub-frames.

249 A multichannel group is composed of several multichannel by consecutive frames. The

250 number of multichannel included in the group is identified by multichannel count of channel

251 status bit 44 to 47. The group starts with preamble “B” and repeats itself with no break in the

252 block without un-grouped frame. The group is divided into one or two multichannel subgroups

253 by multichannel configuration of channel status bit 49 to 60 and multichannel map of channel

254 status bit 64 to 165. The subgroup is composed of some specific multichannel by consecutive

255 sub-frames. Each multichannel within the multichannel subgroup B is re-numbered according

256 to multichannel number of channel status bit 64 to 165. Each channel carries consecutive

257 audio sample word.

258 An example is showed in Figure 1 and Table 1. The multichannel group is composed of eight

259 multichannel. This number of eight is identified by multichannel count value of “1110”. The

260 multichannel subgroup A is composed of three multichannel identified by multichannel

261 configuration value of “100001010000” including FrontLeft channel, FrontRight channel and

262 FrontCenter channel given in ITU-R BS.2094-1. The multichannel subgroup B is composed of

263 77th multichannel (channel label ID name of HFL) and 78th multichannel (channel label ID

264 name of HFR) by setting the channel status bit 77 to “1” and the channel status bit 78 to “1”.

265 Channels of multichannel order 6, 7 and 8 are not used in this example.
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X Y Z Y X Y X X X Y
Y Y
Channel 1 W

M Channel 1 W Channel 2 B Channel 1 W Channel 2 M Channel 1 W Channel 2 M Channel 1 W Channel 2 M Channel 1 W Channel 2 M

Multichannel

Multichannel Multichannel Multichannel Multichannel Multichannel Multichannel Multichannel Multichannel

Multichannel Multichannel
Order 2 Order 3 Order 4 Order 5 Order 6 Order 7 Order 8 Order 1
Order 7 Order 8 Order 1
Multichannel group Multichannel group Multichannel group
Multichannel subgroup A
Multichannel subgroup B Multichannel subgroup A

Not configured FrontLeft FrontRight FrontCenter HFR Not configured Not configured

Not configured HFL Not configured FrontLeft
266
267
268 Figure 1 – Example: multichannel group and subgroups

269 The sampling frequency of each audio multichannel is identical and identified by original

270 sampling frequency of channel status
...

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