IEC 61937-15:2021
(Main)Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 15: Non-linear PCM bit streams according to Auro-Cx format
Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 15: Non-linear PCM bit streams according to Auro-Cx format
IEC 61937-15:2021 describes the method to convey non-linear PCM bit streams in accordance with the Auro-Cx format.
General Information
Standards Content (Sample)
IEC 61937-15 ®
Edition 1.0 2021-03
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 15: Non-linear PCM bit streams according to Auro-Cx format
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IEC 61937-15 ®
Edition 1.0 2021-03
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 15: Non-linear PCM bit streams according to Auro-Cx format
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.040.40 ISBN 978-2-8322-9526-7
– 2 – IEC 61937-15:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 8
4 Mapping of the audio bit stream on to IEC 61937-1 . 8
4.1 General . 8
4.2 Auro-Cx burst-info . 8
5 Format of Auro-Cx data-bursts . 9
5.1 General . 9
5.2 Pause data-burst . 9
5.3 Audio data-bursts . 10
5.3.1 ACX data-burst . 10
5.3.2 Latency of the Auro-Cx Decoder . 13
5.3.3 ACX HBR2 data-burst . 14
5.3.4 Latency of the ACX HBR2 Decoder . 17
5.3.5 ACX HBR4 data-burst . 18
5.3.6 Latency of the ACX HBR4 Decoder . 21
5.3.7 ACX HBR8 data-burst . 22
5.3.8 Latency of the ACX HBR8 Decoder . 25
Bibliography . 27
Figure 1 – ACX data-burst . 10
Figure 2 – ACX Delay Time . 14
Figure 3 – Auro-Cx HBR2 data-burst . 14
Figure 4 – ACX HBR2 Delay Time. 18
Figure 5 – Auro-Cx HBR4 data-burst . 18
Figure 6 – ACX HBR4 Delay time . 22
Figure 7 – Auro-Cx HBR8 data-burst . 22
Figure 8 – ACX HBR8 Delay Time. 26
Table 1 – Fractional frame rates . 8
Table 2 – Burst-info for Auro-Cx data-type and subdata-types . 9
Table 3 – Repetition period of the Pause data-bursts . 9
Table 4 – Data-type-dependent information for ACX . 10
Table 5 – ACX data-burst: meaning of Pc bits 8 – 12 . 11
Table 6 – ACX IEC 60958 frame rate for high sample rates . 12
Table 7 – ACX repetition periods for fractional frame rates 29,97 fps, 59,94 fps and
119,88 fps . 12
Table 8 – Maximum burst-length values per ACX data-burst repetition period . 13
Table 9 – Data-type-dependent information for ACX HBR2 . 14
Table 10 – ACX HBR2 data-burst: meaning of Pc bits 8 – 12 . 15
Table 11 – ACX HBR2 IEC 60958 frame rate for high sample rates . 16
Table 12 – ACX HBR2 repetition periods for fractional frame rates 29,97 fps, 59,94 fps
and 119,88 fps . 16
Table 13 – Maximum burst-length values per ACX HBR2 data-burst repetition period . 17
Table 14 – Data-type-dependent information for ACX HBR4 . 18
Table 15 – ACX HBR4 data-burst: meaning of Pc bits 8–12 . 19
Table 16 – ACX HBR4 IEC 60958 frame rate for high sample rates . 20
Table 17 – ACX HBR4 repetition periods for fractional frame rates 29,97 fps, 59,94 fps
and 119,88 fps . 20
Table 18 – Maximum burst-length values per ACX HBR4 data-burst repetition period . 21
Table 19 – Data-type-dependent information for ACX HBR8 . 22
Table 20 – ACX HBR8 data-burst: meaning of Pc bits 8 – 12 . 23
Table 21 – ACX HBR8 IEC 60958 frame rate for high sample rates . 24
Table 22 – ACX HBR8 repetition periods for fractional frame rates 29,97 fps, 59,94 fps
and 119,88 fps . 24
Table 23 – Maximum burst-length values per ACX HBR8 data-burst repetition period . 25
– 4 – IEC 61937-15:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO – INTERFACE FOR NON-LINEAR PCM
ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 15: Non-linear PCM bit streams according to Auro-Cx format
FOREWORD
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IEC 61937-15 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
100/3462/CDV 100/3536/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.
A list of all parts in the IEC 61937 series, published under the general title Digital audio –
Interface for non-linear PCM encoded audio bi
...
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