IEC 61937-9:2017

IEC 61937-9 ®
Edition 2.0 2017-08
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 9: Non-linear PCM bitstreams according to the MAT format
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IEC 61937-9 ®
Edition 2.0 2017-08
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying

IEC 60958 –
Part 9: Non-linear PCM bitstreams according to the MAT format

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.30; 35.040 ISBN 978-2-8322-4702-0

– 2 – IEC 61937-9:2017 © IEC 2017
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviated terms . 5
3.4 Abbreviated terms . 6
4 Mapping of the audio bitstream on to IEC 61937-1 . 6
4.1 General . 6
4.2 MAT burst-info . 6
5 Format of MAT data-bursts . 6
5.1 General . 6
5.2 Pause data-burst . 7
5.3 Audio data-bursts . 7
5.3.1 The MAT data . 7
5.3.2 Latency of the MAT decoder . 10
Bibliography . 11

Figure 1 – MAT data-burst . 7
Figure 2 – Latency of MAT decoding . 10

Table 1 – Shorthand notation for fractional frame rates . 6
Table 2 – Fields of burst-info . 6
Table 3 – Repetition period of the pause data-bursts . 7
Table 4 – Data-type-dependent information for MAT . 7
Table 5 – Sampling frequency of MAT-encoded audio and IEC 60958 frame rate . 8
Table 6 – MAT audio frame rate and corresponding data-burst repetition period for
video-frame-aligned MAT bitstreams . 8
Table 7 – MAT data-burst sequence and repetition period variance to ensure MAT
audio frame alignment at 59,94 and 119,88 fps . 8
Table 8 – MAT data-burst: meaning of Pc bits 8 to 11 when bit 12 of Pc = 1 . 9
Table 9 – Maximum burst-length values per MAT data-burst repetition period . 9

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO
BITSTREAMS APPLYING IEC 60958 –

Part 9: Non-linear PCM bitstreams according to the MAT format

FOREWORD
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International Standard IEC 61937-9 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 second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of new frame rates.

– 4 – IEC 61937-9:2017 © IEC 2017
The text of this International Standard is based on the following documents:
CDV Report on voting
100/2721/CDV 100/2933/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.
A list of all parts in the IEC 61973 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
...