IEC TS 62702-2:2016

IEC TS 62702-2 ®
Edition 1.0 2016-05
TECHNICAL
SPECIFICATION
Audio archive system –
Part 2: Audio data preservation

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IEC TS 62702-2 ®
Edition 1.0 2016-05
TECHNICAL
SPECIFICATION
Audio archive system –
Part 2: Audio data preservation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.30; 35.220.30 ISBN 978-2-8322-3286-6

– 2 – IEC TS 62702-2:2016 © IEC 2016
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Objective media inspection . 6
4.1 Criteria of the objective media . 6
4.2 Criteria of the archival media for preservation and dissemination . 7
5 Digitization of audio content . 7
5.1 Condition and environment . 7
5.2 Digitization method . 7
5.2.1 Content of analogue media . 7
5.2.2 Content of digital media . 8
6 Inspection of digitised file and recorded media . 9
7 Reception of digitised content . 10
8 Archival information package . 10
8.1 Content information . 10
8.2 Package format for AIP . 10
9 Preservation . 11
10 Access . 11
11 Dissemination . 11
11.1 Format . 11
11.2 Copyright management . 12
Annex A (informative) Digital signal capturing . 13
Annex B (informative) Digitised content inspection in disk media . 15
Annex C (informative) Treatment of content noise. 16
Bibliography . 17

Figure 1 – Digitization of analogue signals . 7
Figure 2 – Digital signal capturing . 9
Figure A.1 – Signal capturing from the D/A converter signal . 13
Figure A.2 – Signal capturing from the digital audio interface . 14

Table 1 – Digital signal format . 8
Table 2 – File format . 8
Table 3 – Digital to digital conversion format . 9
Table 4 – Audio file format . 9
Table 5 – Content information . 10
Table 6 – Dissemination format . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO ARCHIVE SYSTEM –
Part 2: Audio data preservation

FOREWORD
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The main task of IEC technical committees is to prepare International Standards. In
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specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62702-2, which is a technical specification, has been prepared by technical area 6:
Storage media, storage data structures, storage systems and equipment, of IEC technical
committee 100: Audio, video and multimedia systems and equipment.

– 4 – IEC TS 62702-2:2016 © IEC 2016
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
100/2461/DTS 100/2519/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
A list of all parts in the IEC 62702 series, published under the general title Audio archive
system, can be found on the IEC website.
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 website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

INTRODUCTION
Sound recordings such as music, speech, and storytelling are an important human heritage
and should be preserved whenever possible. However, we were unable to record and
preserve sounds until Edison achieved the first recording in 1877. Although various
technologies were invented later, most of them have a limited lifespan with respect to audio
archiving because storage and sound quality deteriorates when it is transferred to the next
generation storage device.
The progress of LSI technology made it possible to digitize recorded sound. The digital
recording is very suitable for audio archiving because the migration is performed by copying
digital data.
There can be various recording materials for this purpose, they are optical disks, magnetic
disks, magnetic tape and non-volatile memories such as phase change memory.
This Technical Specification specifies physical and logical aspects for a standard of audio
archives of various storage types which are typically used for audio archives in markets.
The IEC 62702 series currently consists of:
Part 1 which specifies the minimum requirements on physical aspects of optical disks for
digital sound recordings. Part 1-1 specifies DVD optical disk, Part 1-2 specifies BD optical
disk.
Part 2 whi
...