Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 13: MPEG-H 3D Audio

IEC 61937-13:2018(E) specifies the method to convey non-linear PCM bitstreams encoded according to the MPEG‑H 3D Audio format.

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Publication Date
09-Apr-2018
Current Stage
PPUB - Publication issued
Start Date
10-Apr-2018
Completion Date
10-Apr-2018
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IEC 61937-13
Edition 1.0 2018-04
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear pcm encoded audio bitstreams applying
IEC 60958 –
Part 13: MPEG-H 3D Audio
IEC 61937-13:2018-04(en)
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IEC 61937-13
Edition 1.0 2018-04
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear pcm encoded audio bitstreams applying
IEC 60958 –
Part 13: MPEG-H 3D Audio
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.040.40 ISBN 978-2-8322-5534-6

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61937-13:2018 © IEC 2018
CONTENTS

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

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

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

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

3 Terms, definitions and abbreviated terms ........................................................................ 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated terms ................................................................................................... 8

4 Mapping of the audio bit stream on to IEC 61937-1 ......................................................... 8

4.1 General ................................................................................................................... 8

4.2 Burst-info for MPEG-H 3D Audio ............................................................................. 8

5 Format of data-burst for MPEG-H 3D Audio ..................................................................... 9

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

5.2 Pause data-bursts for MPEG-H 3D Audio ................................................................ 9

5.3 Audio data-bursts .................................................................................................... 9

5.3.1 MPEG-H 3D Audio ........................................................................................... 9

5.3.2 MPEG-H 3D Audio HBR ................................................................................. 11

5.3.3 Burst payload use cases ................................................................................ 14

5.3.4 Latency.......................................................................................................... 16

Figure 1 – MPEG-H 3D Audio data-burst structure .................................................................. 9

Figure 2 – MPEG-H 3D Audio HBR data-burst structure ........................................................ 11

Figure 3 – MPEG-H 3D Audio burst payload ......................................................................... 14

Figure 4 – MPEG-H 3D Audio burst payload for overlapping data frame ................................ 15

Figure 5 – MPEG-H 3D Audio burst payload for truncated data frame ................................... 16

Table 1 – Values of data-type for MPEG-H 3D Audio .............................................................. 8

Table 2 – Repetition period of pause data-bursts for MPEG-H 3D Audio ................................. 9

Table 3 – MPEG-H 3D Audio burst payload header structure entry ....................................... 10

Table 4 – Data-type-dependent information for data-type MPEG-H 3D Audio ........................ 10

Table 5 – Repetition period and maximum data-burst payload size for

data type MPEG-H 3D Audio ................................................................................................. 11

Table 6 – MPEG-H 3D Audio HBR burst payload header structure entry ............................... 12

Table 7 – Data-type-dependent information for data-type MPEG-H 3D Audio HBR ................ 12

Table 8 – Repetition period and maximum data-burst payload size for value 0 of

Pc bits 11 and 12 (2 × audio sample rate) ............................................................................. 13

Table 9 – Repetition period and maximum data-burst payload size for value 1 of

Pc bits 11 and 12 (4 × audio sample rate) ............................................................................. 13

Table 10 – Repetition period and maximum data-burst payload size for value 2 of

Pc bits 11 and 12 (8 × audio sample rate) ............................................................................. 13

Table 11 – Repetition period and maximum data-burst payload size for value 3 of

Pc bits 11 and 12 (16 × audio sample rate) ........................................................................... 14

Table 12 – MPEG-H 3D Audio burst payload header structure entries ................................... 15

Table 13 – MPEG-H 3D Audio burst payload header structure entries

for overlapping data frame .................................................................................................... 15

Table 14 – MPEG-H 3D Audio burst payload header structure entries

for truncated data frame ........................................................................................................ 16

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IEC 61937-13:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 13: MPEG-H 3D Audio
FOREWORD

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International Standard IEC 61937-13 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 International Standard is based on the following documents:
CDV Report on voting
100/2943/CDV 100/3068/RVC

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

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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– 4 – IEC 61937-13:2018 © IEC 2018

A list of all parts in the IEC 61937 series, published under the general title Digital audio –

Interface for non-linear PCM encoded audio bitstreams applying IEC 60958, 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.
A bilingual version of this publication may be issued at a later date.
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IEC 61937-13:2018 © IEC 2018 – 5 –
INTRODUCTION

Modern digital video standards, such as ATSC and DVB, are preparing for next-generation

TV broadcast systems. The latest evolutions in audio introduce fundamental changes to the

way audio is produced, and may well revolutionize the user experience. The new MPEG-H

audio standard offers not only immersive 3D Audio, but it also introduces the concept of audio

objects that can be used to personalize the user experience.

The MPEG-H 3D Audio standard is the next generation MPEG audio codec, and it requires a

framing format that supports more flexible signalling and delivery mechanisms than were

needed for earlier systems. Therefore, the MPEG-H 3D Audio Transport Stream (MHAS)

framing format was specified for use with the MPEG-H 3D Audio codec.

In order to be able to pass the MPEG-H 3D Audio bit stream from a set-top box to an

A/V receiver connected via the IEC 60958 interface, this part of IEC 61937 employs the

MHAS framing format.
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– 6 – IEC 61937-13:2018 © IEC 2018
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 13: MPEG-H 3D Audio
1 Scope

This part of IEC 61937 specifies the method to convey non-linear PCM bitstreams encoded

according to the MPEG-H 3D Audio format.
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 (all parts), Digital audio interface

IEC 61937-1, 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

ISO/IEC 23008-3:2015, Information technology – High efficiency coding and media delivery in

heterogeneous environments – Part 3: 3D audio
3 Terms, definitions and abbreviated terms

For the purposes of this document, the terms and definitions given in IEC 61937-1,

IEC 61937-2 and the following 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 Terms and definitions
3.1.1
audio sample rate

sampling frequency of the linear PCM audio samples before encoding and after decoding

3.1.2
frame length
number of linear PCM audio samples per MPEG-H 3D Audio data frame

Note 1 to entry: MPEG-H 3D Audio can operate in several modes using any of 1 024, 2 048, 4 096, 768, 1 536 or

3 072 linear PCM audio samples per MPEG-H 3D Audio data frame.
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IEC 61937-13:2018 © IEC 2018 – 7 –
3.1.3
latency

delay time of an external audio decoder to decode an MPEG-H 3D Audio data-burst defined

as the sum of two values – the receiving delay time and the decoding delay time
3.1.4
MHASPacketLabel

field in an MPEG-H 3D Audio stream packet that provides an indication on which packets

belong together
3.1.5
MHASPacketLength
field in an MPEG-H 3D Audio stream packet that indicates the length of the
MHASPacketPayload in bytes
3.1.6
MHASPacketPayload
payload of the MHASPacket
3.1.7
MHASPacketType

field in an MPEG-H 3D Audio stream packet that specifies the payload type in the packet

given in ISO/IEC 23008-3:2015, 14.3.1
3.1.8
MPEG-H 3D Audio data frame

sequence of one or more MPEG-H 3D Audio stream packets (MHAS packets), as defined in

ISO/IEC 23008-3:2015, Clause 14 that represents frame length (or fewer) linear PCM audio

samples
3.1.9
MPEG-H 3D Audio stream packet

building blocks of an MPEG-H 3D audio stream that comprises an MHASPacketType field, an

MHASPacketLabel field, an MHASPacketLength field, and an MHASPacketPayload
3.1.10
MPEG-H 3D Audio Stream

self-contained stream format to transport ISO/IEC 23008-3 (MPEG-H 3D Audio) data as

defined in ISO/IEC 23008-3:2015, Clause 14
3.1.11
PACTYP_MPEGH3DACFG
MHASPacketType registration for an MHAS Packet that embeds an MPEG-H 3D audio

configuration structure in the MHASPacketPayload as defined in ISO/IEC 23008-3:2015, 14.4

3.1.12
PACTYP_MPEGH3DAFRAME

MHASPacketType registration for an MHAS Packet that embeds a frame of MPEG-H 3D audio in

the MHASPacketPayload as defined in ISO/IEC 23008-3:2015, 14.4
3.1.13
PACTYP_AUDIOSCENEINFO

MHASPacketType registration for an MHAS Packet that embeds an MPEG-H 3D audio scene

information structure in the MHASPacketPayload as defined in ISO/IEC 23008-3:2015, 14.4

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– 8 – IEC 61937-13:2018 © IEC 2018
3.1.14
PACTYP_AUDIOTRUNCATION

MHASPacketType registration for an MHAS Packet that indicates a potential truncation as

defined in ISO/IEC 23008-3:2015, 14.4

Note 1 to entry: Truncation in this context means the removal of audio samples from the decoded PCM samples.

Audio samples are removed either before or after a truncation point as signaled in the truncation packet.

3.1.15
truncated MPEG-H 3D Audio data frame

MPEG-H 3D Audio data frame that represents fewer than frame length linear PCM audio

samples

Note 1 to entry: A truncated MPEG-H 3D Audio data frame contains at least one MHAS packet with

MHASPacketType PACTYP_AUDIOTRUNCATION.

Note 2 to entry: Truncation in this context means the removal of audio samples from the decoded PCM samples.

3.2 Abbreviated terms
HBR high bit rate
MHAS MPEG-H 3D Audio stream
4 Mapping of the audio bit stream on to IEC 61937-1
4.1 General

Coding of the bit stream and data-burst is in accordance with IEC 61937-1 and IEC 61937-2.

4.2 Burst-info for MPEG-H 3D Audio

The 16-bit burst-info contains information about the data that will be found in the data-burst.

See Table 1.
Table 1 – Values of data-type for MPEG-H 3D Audio
Data-type Data-type Contents Reference point R Repetition period
bits 0-4 bits 5-6 of data-burst
according to measured in
Value of
IEC 61937-2 IEC 60958 frames
Pc bits 5-6
Value of
Pc bits 0-4
0-24 0-3 In accordance with
IEC 61937-2
25 0 MPEG-H 3D Audio Bit 0 of Pa See Table 5
1 MPEG-H 3D Audio HBR Bit 0 of Pa See Table 8,
Table 9, Table 10
and Table 11
2, 3 According to IEC 61937-2
26-31 0-3 In accordance with
IEC 61937-2

Bits 0 to 4 of the burst-info (Pc) signal the data-type used for transmission. For MPEG-H 3D

Audio, the signalled data-type is 25.

The Pc bits 5 to 6 indicate the MPEG-H 3D Audio mode. The repetition periods of data-bursts

in IEC 60958 frames shall be determined from the data-type-dependent information specified

in Table 4 and Table 7.
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IEC 61937-13:2018 © IEC 2018 – 9 –
5 Format of data-burst for MPEG-H 3D Audio
5.1
...

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