SIST EN 61603-2:1999
(Main)Transmission of audio and/or video and related signals using infra-red radiation -- Part 2: Transmission systems for audio wide band and related signals
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
Relations
Standards Content (Sample)
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.
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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.
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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
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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
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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
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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
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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.
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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.
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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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