Audio archive system - Part 2: Audio data preservation

IEC TS 62702-2:2016(E) specifies the requirements for digitization of audio data for audio preservation.

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IEC TS 62702-2

Edition 1.0 2016-05

Audio archive system –
Part 2: Audio data preservation

IEC TS 62702-2:2016-05(en)

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Copyright © 2016 IEC, Geneva, Switzerland

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IEC TS 62702-2


Edition 1.0 2016-05



Audio archive system –

Part 2: Audio data preservation




ICS 33.160.30; 35.220.30 ISBN 978-2-8322-3286-6

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

® Registered trademark of the International Electrotechnical Commission

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– 2 – IEC TS 62702-2:2016 © IEC 2016
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

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IEC TS 62702-2:2016 © IEC 2016 – 3 –


Part 2: Audio data preservation

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The main task of IEC technical committees is to prepare International Standards. In
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• the required support cannot be obtained for the publication of an International Standard,
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• the subject is still under technical development or where, for any other reason, there is the
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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.

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– 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 "" 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.

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IEC TS 62702-2:2016 © IEC 2016 – 5 –
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
Part 2 which specifies the minimum requirements for digitization of content, format of digitised
content, content information and media inspection.

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– 6 – IEC TS 62702-2:2016 © IEC 2016

Part 2: Audio data preservation

1 Scope
This part of IEC 62702, specifies the requirements for digitization of audio data for audio
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62227, Multimedia home server systems – Digital rights permission code
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
audio archive
archive that consists of audio data preservation
audio data preservation
data of audio stored in physical media for preservation
archival information package
distribution of preserved audio content to users
objective media
media whose storage is based on impartial criteria
4 Objective media inspection
4.1 Criteria of the objective media
In order to objectively determine whether recorded audio content should be digitised and
migrated to an archival media for long term preservation, the following criteria should be
• Evaluate the availability of the media and its playback means in the long term with
consideration to the format of the media; whether the media specification is internationally

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IEC TS 62702-2:2016 © IEC 2016 – 7 –
standardized or publically accessible and available. If the availability is limited in its
lifespan, i.e. less than the archive system’s target term, then the media is worth preserving.
• Evaluate the degradation of the media. If the degradation of the media causes degradation
of the reproduction, of sound, or if playback is difficult, then the media should be
• Evaluate the continuity of the organization that possesses the media to determine whether
the media should be preserved.
4.2 Criteria of the archival media for preservation and dissemination
To determine what kind of media should be used for archival media for preservation and
dissemination media, the following criteria should be applied.
• For archival media, evaluate the long term availability, durability and energy efficiency.
However, it depends on the policy of the archive organization.
• For dissemination of media, evaluate the media format of availability, popularity,
availability of reproduction devices or software. Copy protection or rights management
systems are considered if the content is copyrighted. If rights management systems apply,
see IEC 62227.
5 Digitization of audio content
5.1 Condition and environment
The objective me

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