IEC 61937-12:2010

Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 12: Non-linear PCM bitstreams according to the DRA formats

IEC 61937-12:2010 specifies the method for IEC 60958 to convey non-linear PCM bitstreams encoded in accordance with the DRA formats. This bilingual version, published in 2010-10, corresponds to the English version. The French version of this standard has not been voted upon.

Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire conformément à la CEI 60958 - Partie 12: Flux de bits MIC non linéaire selon les formats DRA

La CEI 61937-12:2010 spécifie la méthode de la CEI 60958 pour acheminer des flux de bits MIC non linéaires codés selon les formats DRA. La présente version bilingue, publiée en 2010-10, correspond à la version anglaise. La version française de cette norme n'a pas été soumise au vote.

General Information

• Status: Published
• Publication Date: 18-May-2010
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.200 - Integrated circuits. Microelectronics
• ICS: 33.160.30 - Audio systems
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: PPUB - Publication issued
• Start Date: 15-Aug-2010
• Completion Date: 19-May-2010

Standards Content (Sample)

IEC 61937-12 ®
Edition 1.0 2010-05
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 12: Non-linear PCM bitstreams according to the DRA formats

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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IEC 61937-12 ®
Edition 1.0 2010-05
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 12: Non-linear PCM bitstreams according to the DRA formats

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
N
ICS 33.160.30; 33.170 ISBN 978-2-88910-934-0
– 2 – 61937-12 © IEC:2010(E)
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .5
3.1 Terms and definitions .5
3.2 Abbreviations .6
3.3 Presentation convention .6
4 DRA burst-info.6
5 Format of DRA data-bursts .6
5.1 General .6
5.2 Pause data-burst.7
5.3 Audio data-bursts .7
5.3.1 DRA condition .7
5.3.2 DRA half-rate low sampling frequency condition .9
5.3.3 DRA quarter-rate low sampling frequency condition.11
Bibliography.14

Figure 1 – DRA data-burst .8
Figure 2 – Latency of DRA decoding.9
Figure 3 – DRA data-burst half-rate low sampling frequency.10
Figure 4 – Latency of DRA decoding half-rate low sampling frequency .11
Figure 5 – DRA data-burst quarter-rate low sampling frequency.12
Figure 6 – Latency of DRA decoding quarter-rate low sampling frequency .13

Table 1 – Fields of burst-info .6
Table 2 – Data-type-dependent information for data-type DRA.7
Table 3 – Repetition period of pause data-bursts .7

61937-12 © IEC:2010(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 12: Non-linear PCM bitstreams according to the DRA formats

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61937-12 has been prepared by technical area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/1578/CDV 100/1651/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 61937-12 © IEC:2010(E)
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

61937-12 © IEC:2010(E) – 5 –
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 12: Non-linear PCM bitstreams according to the DRA formats

1 Scope
This part of IEC 61937 specifies the method for IEC 60958 to convey non-linear PCM
bitstreams encoded in accordance with the DRA formats.
2 Normative references
The following referenced documents are indispensable for the application 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 (all parts), Digital audio interface
IEC 61937 (all parts), Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958
IEC 61937-1:2007, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 1: General
IEC 61937-2, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 2: Burst-info
3 Terms and definitions
For the purposes of this document, the following terms, definitions, abbreviations and
presentation conventions apply.
3.1 Terms and definitions
3.1.1
sub data-type
type of payload of the data-burst for use with the specified data-type
3.1.2
latency
delay time of an external audio decoder to decode a DRA data-burst
NOTE It is defined as the sum of two values of the receiving delay time and the decoding delay time.
3.1.3
length code
indicates the length of the data-burst payload in bits or bytes
NOTE See Table 3 of IEC 61937-1.

– 6 – 61937-12 © IEC:2010(E)
3.2 Abbreviations
DRA Digital Rise Audio
3.3 Presentation convention
01 Value “01” in binary format
4 DRA burst-info
The general coding method of the bitstream and data-burst is according to IEC 61937-1 and
IEC 61937-2. The 16-bit burst-info (Pc) is defined in Table 1.
Table 1 – Fields of burst-info
Repetition period
Reference
Bits of Pc Value Contents of data-burst in
point R
IEC 60958 frames
Data-type
0-22 In accordance with IEC 61937-2
DRA or other MPEG applications according to
0 – 4
IEC 61937-2, depending on sub data-type
24-31 In accordance with IEC 61937-2
Subdata-type
00 -10 In accordance with IEC 61937-2
2 2
5 – 6
Depending on bits
11 DRA Bit 0 of Pa
8-9 of Pc
7 In accordance with IEC 61937-1
data-type-dependent information for
8 – 12
data-type DRA
13 – 15 In accordance with IEC 61937-1

5 Format of DRA data-bursts
5.1 General
This clause specifies the audio data-bursts of DRA. Specific properties such as reference
points, repetition period, the method of filling stream gaps, and decoding latency are specified
for the DRA data-type.
61937-12 © IEC:2010(E) – 7 –
The decoding latency (or delay), indicated for the DRA data-type, should be used by the
transmitter to schedule data-bursts as necessary to establish synchronization between the
video and the decoded audio.
The data-type-dependent information assignment for DRA is given in Table 2. As shown in
Table 2, bits 8-9 of Pc are used to identify the relation between the sampling frequencies of
DRA and the IEC 60958 frame rate.
Table 2 – Data-type-dependent information for data-type DRA
Bits of Pc
Repetition period of
Value Contents
data-burst in IEC 60958 frames
LSB.MSB
00 DRA 1 024
DRA half-rate low sampling
01 2 048
frequency
8 – 9
DRA quarter-rate low
10 4 096
sampling frequency
11 Reserved -
Reserved, shall be used until further
definition
10 – 12
Reserved, shall not be used until further
001 – 111
2 2
definition
5.2 Pause data-burst
The pause data-burst for DRA is given in Table 3.
Table 3 – Repetition period of pause data-bursts
Repetition period of pause data-burst
Type of audio data-burst indicated by bits 8-9
of Pc
Mandatory Recommended
DRA - 32 IEC 60958 frames
DRA half-rate low sampling frequency - 64 IEC 60958 frames
DRA quarter-rate low sampling frequency - 128 IEC 60958 frames

5.3 Audio data-bursts
5.3.1 DRA condition
5.3.1.1 Data for DRA
The streams of the
...

IEC 61937-12 ®
Edition 1.0 2010-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 12: Non-linear PCM bitstreams according to the DRA formats

Audionumérique – Interface pour les flux de bits audio à codage MIC non
linéaire conformément à la CEI 60958 –
Partie 12: Flux de bits MIC non linéaire selon les formats DRA

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
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in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
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IEC 61937-12 ®
Edition 1.0 2010-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 12: Non-linear PCM bitstreams according to the DRA formats

Audionumérique – Interface pour les flux de bits audio à codage MIC non
linéaire conformément à la CEI 60958 –
Partie 12: Flux de bits MIC non linéaire selon les formats DRA

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 33.160.30; 33.170 ISBN 978-2-88912-146-5
– 2 – 61937-12 © IEC:2010
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .5
3.1 Terms and definitions .5
3.2 Abbreviations .6
3.3 Presentation convention .6
4 DRA burst-info.6
5 Format of DRA data-bursts .6
5.1 General .6
5.2 Pause data-burst.7
5.3 Audio data-bursts .7
5.3.1 DRA condition .7
5.3.2 DRA half-rate low sampling frequency condition .9
5.3.3 DRA quarter-rate low sampling frequency condition.11
Bibliography.14

Figure 1 – DRA data-burst .8
Figure 2 – Latency of DRA decoding.9
Figure 3 – DRA data-burst half-rate low sampling frequency.10
Figure 4 – Latency of DRA decoding half-rate low sampling frequency .11
Figure 5 – DRA data-burst quarter-rate low sampling frequency.12
Figure 6 – Latency of DRA decoding quarter-rate low sampling frequency .13

Table 1 – Fields of burst-info .6
Table 2 – Data-type-dependent information for data-type DRA.7
Table 3 – Repetition period of pause data-bursts .7

61937-12 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 12: Non-linear PCM bitstreams according to the DRA formats

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61937-12 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 bilingual version, published in 2010-10, corresponds to the English version.
The text of this standard is based on the following documents:
CDV Report on voting
100/1578/CDV 100/1651/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.

– 4 – 61937-12 © IEC:2010
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61937-12 © IEC:2010 – 5 –
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 12: Non-linear PCM bitstreams according to the DRA formats

1 Scope
This part of IEC 61937 specifies the method for IEC 60958 to convey non-linear PCM
bitstreams encoded in accordance with the DRA formats.
2 Normative references
The following referenced documents are indispensable for the application 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 (all parts), Digital audio interface
IEC 61937 (all parts), Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958
IEC 61937-1:2007, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 1: General
IEC 61937-2, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 2: Burst-info
3 Terms and definitions
For the purposes of this document, the following terms, definitions, abbreviations and
presentation conventions apply.
3.1 Terms and definitions
3.1.1
sub data-type
type of payload of the data-burst for use with the specified data-type
3.1.2
latency
delay time of an external audio decoder to decode a DRA data-burst
NOTE It is defined as the sum of two values
...