Digital audio interface - Part 4-2: Professional applications - Metadata and subcode

IEC 60958-4-2:2016 specifies the format for coding metadata, or subcode, that relates to the audio content and is carried with it. This part of IEC 60958, together with IEC 60958-1, IEC 60958-4-1, and IEC 60958-4-4, specifies an interface for serial digital transmission of two channels of periodically sampled and linearly represented digital audio data from one transmitter to one receiver. This first edition, together with IEC 60958-4-1 and IEC 60958-4-4, cancels and replaces IEC 60958-4 published in 2003 and its Amendment 1:2008 and constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60958-4:2003 with its Amendment 1:2008:
- support for a wider range of physical media;
- support for a wider range of audio sampling frequencies;
- deprecation of "minimum implementation" of channel status data.

Interface audionumérique - Partie 4-2: Applications professionnelles - Métadonnées et sous-code

L'IEC 60958-4-2:2016 spécifie le format de codage de métadonnées ou d'un sous-code, qui sont relatifs au contenu audio et sont transportés avec ce dernier. La présente partie de l'IEC 60958 et l'IEC 60958-1, l'IEC 60958-4-1 et l'IEC 60958-4-4 précisent conjointement une interface de transmission numérique en série de deux voies de données audionumériques échantillonnées de façon périodique et représentées de façon linéaire entre un émetteur et un récepteur. Cette première édition, avec l'IEC 60958-4-1 et l'IEC 60958-4-4, annule et remplace l'IEC 60958-4 parue en 2003 et l'Amendement 1:2008 et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC 60958-4:2003 et son Amendement 2008:
- prise en charge d'une gamme plus large de supports physiques;
- prise en charge d'une gamme plus large de fréquences d'échantillonnage audio;
- "mise en oeuvre minimale" des données de la voie de signalisation déconseillée.

General Information

Status
Published
Publication Date
23-Mar-2016
Current Stage
PPUB - Publication issued
Start Date
24-Mar-2016
Completion Date
24-Mar-2016
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IEC 60958-4-2
Edition 1.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio interface –
Part 4-2: Professional applications – Metadata and subcode
Interface audionumérique –
Partie 4-2: Applications professionnelles – Métadonnées et sous-code
IEC 60958-4-2:2016-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60958-4-2
Edition 1.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio interface –
Part 4-2: Professional applications – Metadata and subcode
Interface audionumérique –
Partie 4-2: Applications professionnelles – Métadonnées et sous-code
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.30 ISBN 978-2-8322-3247-7

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
---------------------- Page: 3 ----------------------
– 2 – IEC 60958-4-2:2016 © IEC 2016
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 User data format ............................................................................................................ 8

5 Channel status format .................................................................................................... 8

5.1 Channel status bit ................................................................................................. 8

5.2 Channel status block ............................................................................................. 8

5.3 Implementation ..................................................................................................... 9

5.3.1 Implementation levels .................................................................................... 9

5.3.2 Transmitter requirement ................................................................................. 9

5.3.3 Receiver requirement ..................................................................................... 9

5.4 Documentation ...................................................................................................... 9

5.5 Channel status content .......................................................................................... 9

5.5.1 General ......................................................................................................... 9

5.5.2 Byte 0: Basic audio parameters .................................................................... 11

5.5.3 Byte 1: Channel modes, user bits management ............................................. 12

5.5.4 Byte 2: Auxiliary bits, word length and alignment level .................................. 12

5.5.5 Byte 3: Multichannel modes .......................................................................... 13

5.5.6 Byte 4: DARS, hidden information, multiple-rate sampling frequencies .......... 14

5.5.7 Byte 5: Reserved ......................................................................................... 15

5.5.8 Bytes 6 to 9: Alphanumeric channel origin .................................................... 16

5.5.9 Bytes 10 to 13: Alphanumeric channel destination ........................................ 16

5.5.10 Bytes 14 to 17: Local sample address code .................................................. 16

5.5.11 Bytes 18 to 21: Time-of-day sample address code ........................................ 16

5.5.12 Byte 22: Reserved ....................................................................................... 16

5.5.13 Byte 23: Channel status data CRCC ............................................................. 17

5.6 Channel status when non-PCM audio is flagged ................................................... 17

6 Auxiliary bits ................................................................................................................ 17

6.1 Availability of auxiliary bits .................................................................................. 17

6.2 Use of auxiliary bits ............................................................................................. 17

Annex A (informative) Channel modes ................................................................................ 18

Annex B (informative) Provision of additional, voice-quality channels .................................. 19

Annex C (informative) Generation of CRCC (byte 23) for channel status ............................. 20

Bibliography ....................................................................................................................... 22

Figure 1 – Channel status data format ................................................................................. 10

Figure B.1 – Frame and block structure ............................................................................... 19

Figure C.1 – Flow diagram including exclusive or gates ....................................................... 20

---------------------- Page: 4 ----------------------
IEC 60958-4-2:2016 © IEC 2016 – 3 –

Table 1 – Non-PCM audio, protected status bits .................................................................. 17

---------------------- Page: 5 ----------------------
– 4 – IEC 60958-4-2:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO INTERFACE –
Part 4-2: Professional applications – Metadata and subcode
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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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 60958-4-2 has been prepared by technical area 4: Digital system

interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia

systems and equipment.

This first edition, together with IEC 60958-4-1 and IEC 60958-4-4, cancels and replaces

IEC 60958-4 published in 2003 and its Amendment 1:2008 and constitutes a technical

revision.

This edition includes the following significant technical changes with respect to

IEC 60958-4:2003 with its Amendment 1:2008:
a) support for a wider range of physical media;
b) support for a wider range of audio sampling frequencies;
c) deprecation of “minimum implementation” of channel status data.
---------------------- Page: 6 ----------------------
IEC 60958-4-2:2016 © IEC 2016 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
100/2453/CDV 100/2582/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.

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.

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 website 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 60958-4-2:2016 © IEC 2016
INTRODUCTION

The two-channel digital audio interface has been widely used in a variety of professional

audio applications that have reached beyond the vision of the original standard. In particular,

applications using increased sampling frequencies and alternative physical media.

Separating the standard into independently-maintainable parts allows, for example, additional

transmission media to be introduced in the future by revising IEC 60958-4-4 without affecting

the other parts of the IEC 60958-4 series. The parts comprise:

Part 4-1: Audio content: defines the format for coding audio used for the audio content. It

specifies the semantics of the audio data, including the "validity" flag. It also

specifies the sampling frequency by reference to AES5.

Part 4-2: Metadata and subcode: specifies the format for information, metadata, or subcode

transmitted with the audio data: principally the "channel status" but also user data

and the auxiliary bits. Implementors will note that the current implementation
options ("Standard" and "Enhanced") both require that status data be
implemented correctly in compliant equipment.

Part 4-4: Physical and electrical parameters: specifies the physical signals that convey the

bit stream specified in IEC 60958-1. The transport format is intended for use with

shielded twisted-pair cable of conventional design over distances of up to 100 m
at frame rates of up to 50 kHz. Longer cable lengths and higher frame rates may

be used, but with a rapidly increasing requirement for care in cable selection and

possible receiver equalization, or the use of active repeaters. Provision is made in

this standard for adapting the balanced terminals to use 75 Ω coaxial cable.
Transmission by fibre-optic cable is under consideration.
---------------------- Page: 8 ----------------------
IEC 60958-4-2:2016 © IEC 2016 – 7 –
DIGITAL AUDIO INTERFACE –
Part 4-2: Professional applications – Metadata and subcode
1 Scope

This part of IEC 60958 specifies the format for coding metadata, or subcode, that relates to

the audio content and is carried with it. This part of IEC 60958, together with IEC 60958-1,

IEC 60958-4-1, and IEC 60958-4-4, specifies an interface for serial digital transmission of two

channels of periodically sampled and linearly represented digital audio data from one

transmitter to one receiver.
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 60958-1:2008, Digital audio interface – Part 1: General
IEC 60958-1:2008/AMD1:2014
IEC 60958-3, Digital audio interface – Part 3: Consumer applications

IEC 60958-4-1, Digital audio interface – Part 4-1: Professional applications – Audio content

IEC 60958-4-4, Digital audio interface – Part 4-4: Professional applications – Physical and

electrical parameters

ISO 646, Information technology – ISO 7-bit coded character set for information interchange

ITU-R Recommendation BS.450, Transmission standards for FM sound broadcasting at
VHF
ITU-T Recommendation J.17, Pre-emphasis used on sound program circuits
3 Terms, definitions and abbreviations
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60958-1 and the

following apply.
3.1.1
channel status

bits carrying, in a fixed format aligned with the block, specified in IEC 60958-1, information

associated with each audio channel which is decodable by any interface user
_____________
Previously CCIR Recommendation 450-1.
---------------------- Page: 9 ----------------------
– 8 – IEC 60958-4-2:2016 © IEC 2016
3.1.2
metadata
information relating to the audio content in the same channel
3.1.3
subframe

smallest structural element in a digital audio interface transport stream, carrying one PCM

sample and ancillary information

Note 1 to entry: The format of a subframe is specified in 4.1.1 of IEC 60958-1:2008.

3.2 Abbreviations
DARS Digital Audio Reference Signal
IRV International Reference Version
4 User data format

One bit of user data may be carried in each subframe. Different user data may be carried in

each channel and may be related to the associated audio or not. Its capacity in kbit/s is

therefore equal to the sampling frequency in use, in kilosamples/s, for each channel.

User data bits may be used in any way desired by the user.

Known possible formats for the user data channel are indicated by the channel status byte 1,

bits 4 to 7.
Other possible formats may be used and may or may not be standardized in future.
The default value of the user data bit is logic 0.
5 Channel status format
5.1 Channel status bit

One bit of channel status data shall be carried in each sub-frame. Different channel status

data may be carried in each channel. Their capacity in kbit/s is therefore equal to the

sampling frequency in use, in kilosamples/s.

NOTE The channel status for each audio signal carries information associated with that audio signal, and thus it

is possible for different channel status data to be carried in the two subframes of the digital audio signal. Examples

of information to be carried in the channel status are: length of audio sample words, number of audio channels,

sampling frequency, sample address code, alphanumeric source and destination codes, and emphasis.

5.2 Channel status block

Channel status information shall be organized in 192-bit blocks, subdivided into 8-bit bytes

numbered from 0 to 23. The transmission format shall mark every 192 frame to show that it

carries the first bit of a block. Within each byte, the bits are numbered from 0 to 7, 0 being the

first bit transmitted, so bit 0 of byte 0 is the first bit in the block. Where a byte holds a

numerical value, bit 0 is the least significant bit.

NOTE In IEC 60958-1, the frame that begins with preamble Z contains the first bit of a block in both channels. In

other transports (for example AES10 and IEC 62365) a block start flag is used to mark the first subframe in a block,

and may be applied to each channel independently.
---------------------- Page: 10 ----------------------
IEC 60958-4-2:2016 © IEC 2016 – 9 –
5.3 Implementation
5.3.1 Implementation levels
5.3.1.1 General

The following two implementations are defined: standard and enhanced. These terms are

used to communicate in a simple manner the level of implementation of the interface

transmitter involving the many features of channel status. Irrespective of the level of

implementation, all reserved states of bits defined in 5.5 shall remain unchanged.

5.3.1.2 Standard level

The standard implementation provides a fundamental level of implementation which should

prove sufficient for general applications in professional audio or broadcasting. In standard

implementation, transmitters shall correctly encode and transmit all channel status bits in

byte 0, byte 1, byte 2, and byte 23 (CRCC) in the manner specified in this standard.

NOTE This note applies to the French language only.
5.3.1.3 Enhanced level

In addition to conforming to the requirements described in 5.3.1.2 for the standard

implementation, the enhanced implementation shall provide further capabilities.
5.3.2 Transmitter requirement

Transmitters shall encode channel status to follow all the formatting and channel coding rules

to one of the two specified implementation levels. All transmitters shall correctly encode and

transmit channel status with the correct juxtaposition with respect to the Z preamble or block

start (see IEC 60958-1).
5.3.3 Receiver requirement

Receivers shall decode channel status as required by their application. Receivers shall

interpret CRCC errors as needing to reject the channel status block with the error. Receivers

shall not interpret any errors in a channel status block such as CRCC or block length errors

as a reason to mute or alter the audio content.

The purpose of the CRCC in byte 23 is to indicate corruption of the channel status block due

to switching or editing effects (for example). Due consideration should be given to the

implications of any action on downstream equipment and the associated system in general.

5.4 Documentation

Documentation shall be provided describing the channel status features supported by

interface transmitters and receivers.

To promote compatible operation between items of equipment built to this standard it is

necessary to establish which information bits and operational bits shall be encoded and sent

by a transmitter and decoded by an interface receiver.
5.5 Channel status content
5.5.1 General

The specific organization is presented in Figure 1. Multiple-bit quantities are shown in the

tables with the most significant bit to the left. Note that the order in which the bits are

transmitted is therefore from right to left.
---------------------- Page: 11 ----------------------
– 10 – IEC 60958-4-2:2016 © IEC 2016
Byte Bit
7 6 5 4 3 2 1 0
0 e d c b a
1 g f
2 j i h
3 n = 0 k
3 n = 1 m l
4 r q p o
5 s
Alphanumeric
channel origin date
Alphanumeric
channel destination data
Local sample address code
(32-bit binary)
Time-of-day sample address code
(32-bit binary)
22 Reliability flags
23 Cyclic redundancy check character
IEC
Key
a Use of channel status block j Indication of alignment level
b Linear PCM identification k Channel number
c Audio signal pre-emphasis l Channel number
d Lock indication m Multichannel mode number
e Sampling frequency n Multichannel mode
f Channel mode o Digital audio reference signal
g User bits management p Reserved but undefined
h Use of auxiliary sample bits q Sampling frequency
i Source word length r Sampling frequency scaling flag
s Reserved but undefined
Figure 1 – Channel status data format
---------------------- Page: 12 ----------------------
IEC 60958-4-2:2016 © IEC 2016 – 11 –
5.5.2 Byte 0: Basic audio parameters
Bit 0 Use of channel status block.
0 Consumer use of channel status block.
state
1 Professional use of channel status block.

The significance of byte 0, bit 0 is such that a transmission from an interface conforming to IEC 60958-3

consumer use can be identified, and a receiver conforming only to IEC 60958-3 consumer use will correctly

identify a transmission from a professional-use interface as defined in this standard. Connection of a

professional-use transmitter with a consumer-use receiver or vice versa might result in unpredictable

operation. Thus, the following byte definitions only apply when bit 0 = logic 1 (professional use of the

channel status block).
Bit 1 Linear PCM identification
0 Audio sample word represents linear PCM samples.
state
1 Audio sample word used for purposes other than linear PCM samples.
Bits 4 3 2 Audio signal emphasis

0 0 0 Emphasis not indicated. Receiver defaults to no emphasis with manual override

enabled.
0 0 1 No emphasis. Receiver manual override is disabled.

states 0 1 1 50 µs + 15 µs emphasis, see ITU-R BS.450. Receiver manual override is disabled.

1 1 1 ITU-T J.17 emphasis (with 6,5 dB insertion loss at 800 Hz). Receiver manual

override is disabled

All other states of bits 2 to 4 are reserved and are not to be used until further defined.

Bit 5 Lock indication
0 Default. Lock condition not indicated.
state
1 Source sampling frequency unlocked.
Bits 7 6 Sampling frequency

0 0 Sampling frequency not indicated. Receiver default to interface frame rate and

manual override or auto set is enabled.
1 0 48-kHz sampling frequency. Manual override or auto set is disabled.
states
0 1 44,1-kHz sampling frequency. Manual override or auto set is disabled.
1 1 32-kHz sampling frequency. Manual override or auto set is disabled.

The following considerations for basic audio parameters have to be taken into account.

• The indication that the audio sample words are not in linear PCM form requires that the

validity bit be set for that channel. See 5.6 and IEC 60958-4-1.

• The indication of sampling frequency, or the use of one of the sampling frequencies that

can be indicated in this byte, is not a requirement for operation of the interface. The 00

state of bits 6 to 7 may be used if the transmitter does not support the indication of

sampling frequency, the sampling frequency is unknown, or the sample frequency is not

one of those that can be indicated in this byte. In the latter case for some sampling

frequencies byte 4 may be used to indicate the correct value.

• When byte 1, bits 1 to 3 indicate single channel double sampling frequency mode then the

sampling frequency of the audio signal is twice that indicated by bits 6 to 7 of byte 0.

---------------------
...

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