Transmission of audio and/or video and related signals using infra-red radiation - Part 2: Transmission systems for audio wide band and related signals

Gives methods for measuring and specifying those characteristics of wide band audio IR transmission systems not covered by part 1 of this standard.

Übertragung von Ton- und/oder Bildsignalen und verwandten Signalen mit Infrarot-Strahlung - Teil 2: Übertragungssysteme für Breitband-Audio- und verwandte Signale

Transmission de signaux audio et/ou vidéo et de signaux similaires au moyen du rayonnement infrarouge - Partie 2: Systèmes de transmission audio large bande et signaux similaires

Fournit des méthodes de mesure et de spécification des caractéristiques de systèmes de transmission infrarouge audio large bande qui ne sont pas couverts par la partie 1 de la présente norme.

Transmission of audio and/or video and related signals using infra-red radiation -- Part 2: Transmission systems for audio wide band and related signals (IEC 61603-2:1997)

General Information

Status
Published
Publication Date
29-May-1997
Current Stage
6060 - Document made available
Due Date
30-May-1997
Completion Date
30-May-1997

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SLOVENSKI STANDARD
SIST EN 61603-2:1999
01-april-1999

Transmission of audio and/or video and related signals using infra-red radiation --

Part 2: Transmission systems for audio wide band and related signals (IEC 61603-
2:1997)

Transmission of audio and/or video and related signals using infra-red radiation -- Part 2:

Transmission systems for audio wide band and related signals
Übertragung von Ton- und/oder Bildsignalen und verwandten Signalen mit Infrarot-

Strahlung -- Teil 2: Übertragungssysteme für Breitband-Audio- und verwandte Signale

Transmission de signaux audio et/ou vidéo et de signaux similaires au moyen du

rayonnement infrarouge -- Partie 2: Systèmes de transmission audio large bande et

signaux similaires
Ta slovenski standard je istoveten z: EN 61603-2:1997
ICS:
33.160.99 Druga avdio, video in Other audio, video and
avdiovizuelna oprema audiovisual equipment
SIST EN 61603-2:1999 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
NORME
CEI
INTERNATIONALE
IEC
61603-2
INTERNATIONAL
Première édition
STANDARD
First edition
1997-03
Transmission de signaux audio et/ou vidéo
et de signaux similaires au moyen
du rayonnement infrarouge –
Partie 2:
Systèmes de transmission audio large bande
et signaux similaires
Transmission of audio and/or video and
related signals using infra-red radiation –
Part 2:
Transmission systems for audio
wide band and related signals
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni utilisée No part of this publication may be reproduced or utilized in

sous quelque forme que ce soit et par aucun procédé, électronique any form or by any means, electronic or mechanical, including

ou mécanique, y compris la photocopie et les microfilms, sans photocopying and microfilm, without permission in writing from

l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE Q
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 2 ----------------------
61603-2 © IEC: 1997 – 3 –
CONTENTS
Page

FOREWORD ................................................................................................................................... 5

Clause

1 General..................................................................................................................................... 7

1.1 Scope............................................................................................................................. 7

1.2 Normative references..................................................................................................... 7

1.3 Definitions ...................................................................................................................... 9

2 Explanation of terms and general information.......................................................................... 9

2.1 Transmitter..................................................................................................................... 9

2.2 Combined transmitter and radiator ................................................................................ 9

2.3 Radiator.......................................................................................................................... 9

2.4 Receiver......................................................................................................................... 11

2.5 Ancillary equipment........................................................................................................ 11

2.6 Transmission of audio signals........................................................................................ 11

2.7 Electromagnetic compatibility......................................................................................... 13

2.8 Safety aspects................................................................................................................ 13

3 System considerations ............................................................................................................. 13

3.1 Area of application ......................................................................................................... 13

3.2 Operating environment................................................................................................... 13

3.3 Household and professional-use equipment.................................................................. 13

3.4 System planning and installation.................................................................................... 13

3.5 Partition of functions between elements of the system.................................................. 15

4 General conditions for measurements ..................................................................................... 15

4.1 Electrical input to the transmitter.................................................................................... 15

5 Characteristics to be specified and their methods of measurement ........................................ 15

5.1 Characteristics of the IR source..................................................................................... 15

5.2 Characteristics of the receiver ....................................................................................... 17

6 Interface (matching) values, performance requirements and recommendations..................... 17

6.1 Interface values for transmitter output signals ............................................................... 17

6.2 Interface values for radiator input signals ...................................................................... 19

6.3 Polarity ........................................................................................................................... 21

6.4 Spurious emissions and signals..................................................................................... 21

6.5 Sensitivity for random incidence .................................................................................... 21

6.6 Rated signal-to-noise ratio ............................................................................................. 21

6.7 IR wavelength range ...................................................................................................... 21

6.8 Channel allocations and modulation characteristics ...................................................... 23

6.9 Interface values for audio signals .................................................................................. 29

6.10 Overall audio frequency performance requirements...................................................... 29

7 Marking and contents of specifications .................................................................................... 29

7.1 Marking .......................................................................................................................... 29

7.2 Contents of specifications .............................................................................................. 31

Figures............................................................................................................................................. 33

---------------------- Page: 3 ----------------------
61603-2 © IEC: 1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
TRANSMISSION OF AUDIO AND/OR VIDEO AND
RELATED SIGNALS USING INFRA-RED RADIATION –
Part 2: Transmission systems for audio wide band
and related signals
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 participate in this preparation. The IEC collaborates closely with the International Organization

for Standardization (ISO) in accordance with conditions determined by agreement between the two

organizations.

2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an

international consensus of opinion on the relevant subjects since each technical committee has representation

from all interested National Committees.

3) The documents produced have the form of recommendations for international use and are published in the form

of standards, technical reports or guides and they are accepted by the National Committees in that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC International

Standards transparently to the maximum extent possible in their national and regional standards. Any

divergence between the IEC Standard and the corresponding national or regional standard shall be clearly

indicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject

of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61603-2 has been prepared by subcommittee 100C: Equipment and

systems in the field of audio, video and audiovisual engineering, of IEC technical committee

100: Audio, video and multimedia systems and equipment.
This standard should be read in conjunction with IEC 1147 (technical report).
The text of this standard is based on the following documents:
FDIS Report on voting
100C/37/FDIS 100C/93/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
This standard supersedes IEC 764 and consists of six parts:
Part 1: General
Part 2: Transmission systems for audio wide band and related signals

Part 3: Transmission systems for audio signals for conference and similar systems

Part 4: Transmission systems for low speed remote control
Part 5: Transmission systems for high speed data and remote control
Part 6: Transmission systems for video and audiovisual signals of high quality
---------------------- Page: 4 ----------------------
61603-2 © IEC: 1997 – 7 –
TRANSMISSION OF AUDIO AND/OR VIDEO AND
RELATED SIGNALS USING INFRA-RED RADIATION –
Part 2: Transmission systems for audio wide band
and related signals
1 General
1.1 Scope

This part of IEC 61603 gives methods for measuring and specifying those characteristics of

wide band audio IR transmission systems not covered by part 1 of this standard (see also 3.1).

It allows systems which make different economic use of the available bandwidth to be

described in order that conclusions regarding interference and compatibility can be drawn.

Interface (matching) values and other system characteristics are also covered. This part of

IEC 61603 replaces chapter 1 of IEC 764, which covers only two carrier frequencies for

analogue audio signals, and which does not cover digital audio.
1.2 Normative references

The following normative documents contain provisions which, through reference in this text,

constitute provisions of this part of IEC 61603. At the time of publication, the editions indicated

were valid. All normative documents are subject to revision, and parties to agreements based

on this part of IEC 61603 are encouraged to investigate the possibility of applying the most

recent editions of the normative documents indicated below. Members of IEC and ISO maintain

registers of currently valid International Standards.
IEC 68-2: 1990, Environmental testing – Part 2: Tests

IEC 169-8: 1978, Radio-frequency connectors – Part 8: R.F. coaxial connectors with inner

diameter of outer conductor 6,5 mm (0,256 in) with bayonet lock – Characteristic impedance

50 ohms (type BNC)

IEC 169-24: 1991, Radio-frequency connectors – Part 24: Radio-frequency coaxial connextors

with screw coupling, typically for use in 75 ohm cable distribution systems (type F)

IEC 268-15: 1996, Sound system equipment – Part 15: Preferred matching values for the

interconnection of sound system components

IEC 315-4: 1982, Methods of measurement on radio receivers of various classes of emission –

Part 4: Radio-frequency measurements on receivers for frequency modulated sound-
broadcasting emissions

IEC 581: High fidelity audio equipments and systems – Minimum performance requirements

IEC 581-2: 1986, High fidelity audio equipments and systems – Minimum performance

requirements – Part 2: FM radio tuners
---------------------- Page: 5 ----------------------
61603-2 © IEC: 1997 – 9 –

IEC 581-8: 1986, High fidelity audio equipments and systems – Minimum performance

requirements – Part 8: Combination equipment

IEC 933: Audio, video and audiovisual systems – Interconnections and matching values

IEC 1147: 1993, Uses of infra-red transmission and the prevention or control of interference

between systems

IEC 61603-1: 1997, Transmission of audio and/or video or related signals using infra-red

radiation – Part 1: General

CISPR 13: 1996, Limits and methods of measurement of radio interference characteristics of

sound and television broadcast receivers and associated equipment

CISPR 20: 1996, Limits and methods of measurement of immunity characteristics of sound and

television broadcast receivers and associated equipment

ITU-R Recommendation 412-6: 1994, Planning standards for FM sound broadcasting at VHF

ITU-R Recommendation 641: 1994, Determination of radio-frequency protection ratios for

frequency-modulated sound broadcasting

ITU-R Recommendation 704: 1994, Characteristics of FM sound broadcasting reference

receivers for planning purposes.
1.3 Definitions

For the purpose of this part of IEC 1603, the definitions given in part 1 of this standard apply,

together with the following.

audio wide band: Audio signal whose bandwidth is sufficient for the reproduction to resemble

a natural sound.

NOTE – The definition includes the high fidelity specification given in IEC 581, requiring a minimum upper

frequency of 12,5 kHz (system response loss ≤ –5 dB, see IEC 581-8). It further includes audio signals of digital

origin with upper limit frequencies of about 20 kHz.
2 Explanation of terms and general information
2.1 Transmitter

A transmitter (link A-B in figure 1) has an audio signal input (analogue or digital), and a special

form of electrical output to feed a radiator.
2.2 Combined transmitter and radiator

A combined transmitter and radiator (link A-C in figure 1) does not have an electrical output,

and interface values therefore apply only at the input.
2.3 Radiator

A radiator (link B-C in figure 1) may be combined with other functions, such as a transmitter. At

present, radiators normally consist of a number of IREDs employing different technologies.

These devices have peak emissions in the wavelength range 830 nm to 950 nm, and an IR

bandwidth of about 100 nm.
---------------------- Page: 6 ----------------------
61603-2 © IEC: 1997 – 11 –
2.4 Receiver

Besides the general characteristics given in part 1 of this standard, others may need to be

specified if a receiver (link C-D in figure 1) is combined with other functions, such as

earphones, to form an IR headphone.

To eliminate interference from other modulated IR sources, the receiver shall provide enough

selectivity with regard to the modulated subcarrier in addition to selectivity in the IR band.

Normally this selectivity shall correspond to the spectral bandwidth of the modulated subcarrier

signal, with some margin for instabilities and possible extra features.

Definitions and methods of measurement for selectivity in relation to analogue FM signals are

given in the standards dealing with FM broadcast systems, such as IEC 315-4 and ITU-R

Recommendations 412, 641 and 704.

NOTE – For digital audio transmission, the subject of receiver selectivity is under consideration.

2.5 Ancillary equipment

Ancillary equipment, such as power supplies or battery chargers, may be required for the

operation of a system. The manufacturer should specify all the data necessary for correct

operation and maintenance.
2.6 Transmission of audio signals
2.6.1 Analogue audio signals

Several different modulation techniques may be used for audio wide band signals in systems

using infra-red as a carrier. Intersystem interference within the limited subcarrier frequency

range shall be avoided. The applications include headphones, loudspeaker systems, wireless

microphones and audio links between distributed audio equipment.

Due to its technical performance and bandwidth economy, FM multiplex modulation is mainly

used for multichannel operation in audio wide band systems, and is at present the only tech-

nique for which compatible equipment is available from different manufacturers.

With this modulation technique, the transmitter output signal consists of one or more

modulated subcarriers; this frequency-division multiplex makes economic use of the available

bandwidth.

Pulse modulation may be used for the transmission of analogue signals, usually employing

pulses of duration less than 1 μs. At present, equipment supplied by different manufacturers is

seldom compatible.
2.6.2 Digital audio signals

General information is given in part 1 of this standard. For use in audio wide band and for

similar systems, the requirements in this part are mainly concerned with ensuring that the risk

of interference is as low as possible.
At present, equipment supplied by different manufacturers is seldom compatible.
---------------------- Page: 7 ----------------------
61603-2 © IEC: 1997 – 13 –
2.7 Electromagnetic compatibility

General information is given in part 1 of this standard. Extensive information on intersystem

interference and interference from other sources of IR is given in IEC 1147.

For electromagnetic compatibility, the requirements of CISPR 13 and CISPR 20 shall be

fulfilled.
2.8 Safety aspects
Safety is dealt with in part 1 of this standard.
3 System considerations
3.1 Area of application

This part of IEC 1603 covers single or multichannel, infra-red (IR) audio (speech or music)

transmission systems in one direction, such as systems for listening to high fidelity audio

signals in the home. It also applies where the high audio quality is needed for another purpose,

such as for musical playback during recordings, for language or speech training, for audio

distribution to a large audience in theatres or opera houses, or, in some countries, for bilingual

systems in public buildings.
3.2 Operating environment

The environmental conditions for the equipment are defined in the relevant standards for the

individual units. Unless otherwise specified, the equipment should operate at least within the

temperature range 5 °C to 40 °C and in a relative humidity range up to 85 %.
NOTES

1 Many systems are specified for operation in relative humidities of up to 95 % without condensation.

2 For test methods, see IEC 68-2.
3.3 Household and professional-use equipment

Systems and equipment covered by this part of IEC 1603 are primarily used indoors, and they

have the advantage that they operate without interfering with systems in adjacent rooms.

Household equipment is usually treated with considerable care, and cost is a prime

consideration. Professional-use equipment, however, installed in public buildings, is often

carelessly treated and, for adequate reliability, requires to be robust. This applies,

...

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