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IEC 61937-1
Edition 3.0 2021-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Digital audio – Interface for non-linear PCM Encoded audio bitstreams applying
IEC 60958 –
Part 1: General
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IEC 61937-1
Edition 3.0 2021-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Digital audio – Interface for non-linear PCM Encoded audio bitstreams applying
IEC 60958 –
Part 1: General
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.30 ISBN 978-2-8322-9502-1
– 2 – IEC 61937-1:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION (to Amendment 1) .
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviations and and presentation. 7
3.1 Terms and definitions . 8
3.2 Abbreviations .
3.2 Presentation convention . 9
4 General description . 10
5 Interface format . 10
6 Mapping of the audio bitstream on to IEC 60958 . 10
6.1 Coding of the bitstream . 10
6.2 Burst-payload . 17
6.3 Stuffing . 17
7 Format of data-bursts . 18
7.1 General . 18
7.2 Pause data-burst . 19
7.3 Audio data-bursts . 22
7.4 Null data-burst . 22
Annex A (normative) Channel status when IEC 60958 is used in consumer
applications . 23
Annex B (informative) Monaural linear PCM audio sample simultaneous transferred
with non-linear PCM encoded audio bitstream . 24
Bibliography .
Figure 1 – IEC 60958 interface format . 11
Figure 2 – Data-burst format . 13
Figure 3 – Burst-preamble . 13
Figure 4 – Burst-preamble with extended preamble . 15
Figure 5 – Length of the burst-payload specified by Pd . 17
Figure 6 – Burst spacing . 17
Figure 7 – Flow chart of transmission of a bitstream . 19
Figure 8 – Bridging gaps in-between data-bursts with three pause data-bursts . 20
Figure 9 – Data-burst format of the data-type pause . 21
Figure 10 – Null data-burst . 22
Figure B.1 – Frame and Block structure . 24
Figure B.2 – Example 1: Frame and Block structure @ 48 kHz IEC 60958 frame rate . 25
Figure B.3 – Example 2: Frame and Block structure @ 192 kHz IEC 60958 frame rate . 25
Table 1 – Bit allocation of the IEC 60958 frame . 11
Table 2 – Bit allocation of data-burst in IEC 60958 subframes . 12
Table 3 – Burst-preamble words . 14
Table 4 – Bit map of burst-preambles . 14
Table 5 – Fields of burst-info . 14
Table 6 – Burst-preamble words . 15
Table 7 – Fields of Pe (extended data-type) . 15
Table 8 – Fields of Pf . 16
Table 9 – Values of data-type-dependent info of the pause data-burst . 21
Table 10 – Burst-payload of pause data-burst . 21
Table 11 – Fields of a null data-burst . 22
Table A.1 – Allocation of the channel status bits . 23
Table B.1 – Relationship between sampling frequency for monaural linear PCM and
IEC 60958 frame rate for non-linear PCM . 26
– 4 – IEC 61937-1:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 1: General
FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 61937-1:2007+AMD1:2011. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in strikethrough
red text.
IEC 61937-1 has been prepared by technical area 20: Analogue and digital audio, of IEC
technical committee 100: Audio, video and multimedia systems and equipment. It is an
International Standard.
This third edition cancels and replaces the second edition published in 2007, and
amendment 1 published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Activation of Pe field;
b) Enhanced usage of channel status bits.
c) Addition of Annex B.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3447/CDV 100/3522/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 /members_experts/refdocs. The main document types developed by
IEC are described in greater detail at /standardsdev/publications.
The list of all the parts of IEC 61937, under the general title Digital audio – Interface for non-
linear PCM encoded audio bitstreams applying IEC 60958, can be found on the IEC websi
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