EN 61603-7:2003

Transmission systems for audio and/or video and related signals using infra-red radiation - Part 7: Digital audio signals for conference and similar applications

Describes the characteristics of a digital multiple channel, multiple carrier audio transmission system as an extension to conference interpretation or similar systems using the frequency ranges 45 kHz to 1 MHz and 2 MHz to 6 MHz.

Übertragung von Ton- und/oder Bildsignalen und verwandten Signalen mit Infrarot-Strahlung - Teil 7: Digitale Audiosignale für Konferenzsysteme und ähnliche Anwendungen

Transmission de signaux audio et/ou vidéo et de signaux similaires au moyen du rayonnement infrarouge - Partie 7: Systèmes de transmissions numériques des signaux audio destinés aux conférences et applications similaires

Sistemi za prenos avdio oziroma video in sorodnih signalov z infrardečim sevanjem - 7. del: Digitalni avdio signali za konference in podobno uporabo (IEC 61603-7:2003)

General Information

• Status: Published
• Publication Date: 23-Oct-2003
• Withdrawal Date: 30-Sep-2006
• ICS: 33.040.20 - Transmission systems
• ICS: 33.160.99 - Other audio, video and audiovisual equipment
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Drafting Committee: IEC/TC 100 - IEC_TC_100
• Parallel Committee: IEC/TC 100 - IEC_TC_100
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 24-Oct-2003
• Completion Date: 24-Oct-2003
• Ref Project: SIST EN 61603-7:2004 - Transmission systems for audio and/or video and related signals using infra-red radiation -- Part 7: Digital audio signals for conference and similar applications

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2004
6LVWHPL]DSUHQRVDYGLRR]LURPDYLGHRLQVRURGQLKVLJQDORY]LQIUDUGHþLP
VHYDQMHPGHO'LJLWDOQLDYGLRVLJQDOL]DNRQIHUHQFHLQSRGREQRXSRUDER,(&

Transmission systems for audio and/or video and related signals using infra-red radiation
-- Part 7: Digital audio signals for conference and similar applications
Übertragung von Ton- und/oder Bildsignalen und verwandten Signalen mit Infrarot-
Strahlung -- Teil 7: Digitale Audiosignale für Konferenzsysteme und ähnliche
Anwendungen
Transmission de signaux audio et/ou vidéo et de signaux similaires au moyen du
rayonnement infrarouge -- Partie 7: Systèmes de transmissions numériques des signaux
audio destinés aux conférences et applications similaires
Ta slovenski standard je istoveten z: EN 61603-7:2003
ICS:
33.160.99 Druga avdio, video in Other audio, video and
avdiovizuelna oprema audiovisual equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61603-7
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2003

ICS 33.160.99; 33.040.20 Partly supersedes EN 61603-3:1998

English version
Transmission systems for audio and/or video and related signals
using infra-red radiation
Part 7: Digital audio signals for conference and similar applications
(IEC 61603-7:2003)
Transmission de signaux audio  Übertragung von Ton- und/oder
et/ou vidéo et de signaux similaires Bildsignalen und verwandten Signalen
au moyen du rayonnement infrarouge mit Infrarot-Strahlung
Partie 7: Systèmes de transmissions Teil 7: Übertragungssysteme für digitale
numériques des signaux audio destinés Audiosignale für Konferenzsysteme
aux conférences et applications similaires und ähnliche Anwendungen
(CEI 61603-7:2003) (IEC 61603-7:2003)

This European Standard was approved by CENELEC on 2003-10-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61603-7:2003 E
Foreword
The text of document 100/649/FDIS, future edition 1 of IEC 61603-7, prepared by Technical Area 3,
Infrared systems and applications, of IEC TC 100, Audio, video and multimedia systems and equipment,
was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61603-7 on
2003-10-01.
This European Standard supersedes 2.6.2 of EN 61603-3:1998.

The following dates were fixed:

– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-07-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-10-01

Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A and ZA are normative and annexes B and C are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61603-7:2003 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61603-7:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 61603-1 1997 Transmission of audio and/or video and EN 61603-1 1997
+ corr. May 1997 related signals using infra-red radiation
Part 1: General
IEC 61603-3 1997 Part 3: Transmission systems for audio EN 61603-3 1998
signals for conference and similar
systems
1)
IEC 61920 - Infrared free air applications - -

ISO/IEC 7498-1 1994 Information technology - Open systems EN ISO/IEC 7498-1 1995
interconnection - Basic reference model
Part 1: The basic model
1)
To be published.
INTERNATIONAL IEC
STANDARD
61603-7
First edition
2003-05
Transmission systems of audio and/or video and
related signals using infra-red radiation –
Part 7:
Digital audio signals for conference and
similar applications
 IEC 2003  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61603-7  IEC:2003(E)
CONTENTS
FOREWORD . 4
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 Abbreviations. 5
5 Explanation of terms and general information . 6
6 System considerations. 6
7 Basic system concept . 6
8 Protocol . 7
8.1 System context . 7
8.2 Physical layer . 8
8.3 Data link layer .13
8.4 Detailed overview of audio frame structures.15
9 Data protocol .17
9.1 General .17
9.2 Data messages.18
9.3 Data packet structure.21
Annex A (normative) Definition of prototype filter .23
Annex B (informative) Example of λ/f diagram in the user area conference.24
Annex C (informative) Provision for future developments .25
Bibliography.26
Figure 1 – System . 7
Figure 2 – Conceptual model. 7
Figure 3 – Band allocation for 6 modulated sub-carriers. 8
Figure 4 – (D)QPSK constellation and differential decoding algorithm . 9
Figure 5 – Pulse response of a raised cosine channel filter .10
Figure 6 – Scrambler.11
Figure 7 – Block diagram of sub-band APCM encoder.12
Figure 8 – Quantization of sub-band samples.13
Figure 9 – Superframe structure.14
Figure 10 – RS frame structure .14
Figure 11 – Audio block structure.15
Figure 12 – CRC calculation.15
Figure 13 – Audio block structure for medium quality .16
Figure 14 – Bit-pool sample structure for medium quality .16
Figure 15 – Audio block structure for high quality.16
Figure 16 – Bit-pool sample structure for high quality.17
Figure 17 – Positioning of the data protocol .18

61603-7  IEC:2003(E) – 3 –
Figure 18 – Data message build-up.18
Figure 19 – Configuration message structure .19
Figure 20 – Display message structure for ASCII display data.20
Figure 21 – Display message structure for bitmap display data .21
Figure 22 – Segmentation of data messages.21
Figure 23 – Data packets fitted on to the superframe structure.22
Table 1 – Sub-carrier centre frequencies. 8
Table 2 – Phase transitions of the differential encoding algorithm . 9
Table 3 – Characteristics of sub-band APCM encoder.12
Table 4 – Definition of audio mode bits .15
Table 5 – Audio blocks and audio quality .17
Table 6 – Data message identifier definition.18
Table 7 – SCI definition.19
Table 8 – Channel allocation table .19
Table 9 – Audio quality mode (AQM) to number of audio blocks used.20
Table C.1 – Sub-carrier allocation .25

– 4 – 61603-7  IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
TRANSMISSION SYSTEMS OF AUDIO AND/OR VIDEO
AND RELATED SIGNALS USING INFRA-RED RADIATION –
Part 7: Digital audio signals for conference and
similar applications
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also parti
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