1、STD=BSI ES EN blb03-3-ENGL 1998 = Lb24bb9 07LLL2L 875 = BRITISH STANDARD Tkansmission of audio and/or video and related signals using infra-red radiation Part 3. Tkansmission systems for audio signals for conference and similar systems The European Standard EN 61603-3 : 1998 has the status of a Brit
2、ish Standard ICs 33.160.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61603-3 : 1998 LEC 61603-3 : 1997 BS EN 616033:1998 Amd. No. This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority
3、 of the Standards Board and comes into effect on 15 May 1998 Date Text affected 0 BSI 1998 National foreword This British Standard is the English ianguage version of EN 61603-3 : 1998. It is identical with IEC 61603-3 : 1997. It supersedes Chapter 2 of BS 6418 : 1983 which has been withdrawn. The UK
4、 participation in its preparation was entrusted by Technical Committee EPU100, Audio, video and multimedia systems and equipment, to Subcommittee EPU100/3, Equipment and systems in the field of audio, video and audiovisual engineering, which has the responsibility to: - aid enquirers to understand t
5、he text; - present to the responsible intemational/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK. IEC 61603 comprises the foilowing parts: Par
6、t 1: General (1997) Part 2: Part3 Part 4 Part 5 Part 6 “hanskion systems for audio wide band and related signais (1997) Ii.ansmissi on systems for audio signals for conference and similar systems Ii-ansmission systems for low speed remote control “hansmission systems for high speed data and remote c
7、ontrol Ilansmission systems for video and audiovisual signais of high quality A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been
8、 renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is dram to the fact that CEN and CENELEC Standards normaJly include an annex which lists normative refere
9、nces to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “Intemational Standards Correspondence Index“, or by using the
10、“Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from l
11、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. Amendments issued since publication ISBN O 680 29288 1 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61603-3 February 1998
12、ICs 33.1 60.99 Supersedes HO 455 51:1985 Descriptors: Sound transmission. electroacoustic equipment, infrared radiation, specifications, measurements, characteristics, performance evaluation, electromagnetic compatibility, marking English version Transmission of audio andlor video and related signal
13、s using inf ra-red radiation Part 3: Transmission systems for audio signais for conference and similar systems (IEC 6 1 603-3: 1 997) Transmission de signaux audio et/ou vido et de signaux similaires au moyen du rayonnement infrarouge mit Infrarot-Strahlung Partie 3: Transmission audio pour systmes
14、de confrence et systmes similaires und hnliches bertragung von Ton- und/oder Bildsignalen und verwandten Signalen Teil 3: bertragungssysteme fr Audiosignale fr Konferenzsysteme (CE1 61 603-3: 1 997) (IEC 61 603-3:1997) * * rJY This European Standard was approved by CENELEC on 1998-01-01. CENELEC mem
15、bers are bound to comply with the CENKENELEC 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 applicati
16、on 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 h
17、as the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
18、 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels - 1998 CENELEC - All rights of exploitation in any form and by any means reserv
19、ed worldwide for CENELEC members. Ref. No. EN 61603-3:1998 E STD.BSI BS EN bLb03-3-ENGL 1778 Lb24bb 0711124 584 Page 2 EN 61603-3 : 1998 Foreword The text of document 100C/129/FDIS, future edition 1 of IEC 61603-3, prepared by SC lOOC, Audio, video and multimedia subsystems and equipment, of IEC TC
20、100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61603-3 on 1998-01-01. This European Standard supersedes chapter 2 of HD 455 S1:1985. This standard is to be used in conjunction with ENV 501 85-1 : 1995. The foll
21、owing 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) 1998-1 0-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1 998-1 0-01 Annexes des
22、ignated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61 603-3: 1997 was approved by CENELEC as a European Standard without any modification. STD-ES1 BS EN b
23、LbD3-3-ENGL 1798 Lb24bb7 07LLL25 410 CONTENTS Clause Page 3 EM 61603-3 : 1998 General . 1.1 Scope 1.2 Normative references . 1.3 Definitions . Explanation of terms and general information 3.1 Application area . 3.2 Environment 3.3 System planning and installation 3.4 Partition of functions between e
24、lements of the system General conditions for measurements . Characteristics to be specified and their methods of measurement 5.1 Characteristics of the IR source . 5.2 Characteristics of the receiver Interface (matching) values. performance requirements and recommendations 6.1 Interface values for t
25、ransmitter output signals 6.2 Interface values for radiator input signals . 6.3 Polarity 6.4 Spurious emissions and signals . 6.5 Sensitivity to random incidence 6.6 Rated signal-to-noise ratio . 6.7 Channel allocation and modulation characteristics 6.8 Interface values for audio signals . 6.9 Overa
26、ll audio frequency performance requirements 7.1 Marking 7.2 Contents of specifications System considerations Marking and contents of specifications Page 4 4 4 5 5 7 7 7 7 7 7 7 7 8 8 8 9 10 10 10 10 11 11 12 12 12 12 Tables 1 Channel code. identification number and subcarrier frequency . 11 2 Markin
27、g and contents of specifications 12 Fig u res 1 Schematic representation of a conference sound system . 13 2 Signai chain and related IEC standards . 13 3 Allocation of channels and recommended carriers L 14 Annex ZA . Normative reference to international publications with their corresponding Europe
28、an publications 15 O BSI 1998 STD.BS1 BS EN 61bD3-3-ENGL 1998 II624669 0711L26 357 Page 4 EM 61603-3 : 1998 TRANSMISSION OF AUDIO AND/OR VIDEO AND RELATED SIGNALS USING INFRA-RED RADIATION - Part 3: Transmission systems for audio signals for conference and similar systems 1 General 1.1 Scope This pa
29、rt of IEC 61 603 gives methods for measuring and specifying those characteristics of audio infra-red (IR) transmission systems for conference and similar systems which are not covered by part 1 (see also 3.1). It allows systems which make different economic use of the available bandwidth to be descr
30、ibed in order that conclusions regarding interference and compatibility can be drawn. Interface (matching) values and other system characteristics are also covered. The standard replaces chapter 2 of IEC 60764. 1.2 Normative references The following normative documents contain provisions which, thro
31、ugh 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 appl
32、ying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 60068: Environmental testing IEC 60268-15: 1996, Sound system equipment - Part 15: Preferred matching values for the interconnection of
33、sound system components IEC 60315-4: 1982, Methods of measurement on radio receivers for various classes of emission - Part 4: adio-frequency measurements on receivers for frequency modulated sound-broadcasting emissions IEC 6041 7: 1973, Graphical symbols for use on equipment - Index, survey and co
34、mpilation of the single sheets IEC 60764: 1983, Sound transmission using infra-red radiation IEC 6091 4: 1988, Conference systems - Electrical and audio requirements IEC 61 147: 1993, Uses of infra-red transmission and the prevention or control of interference between systems IEC 61 603-1 : 1997, Tr
35、ansmission of audio and/or video and related signals using infra-red radiation - Part 1: General IEC 61 938: 1996, Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signals IS0 7000: 1989, Graphical symbols for use on equipment - Inde
36、x and synopsis ITU-R 41 2-6: 1995, Planning standards for FM sound broadcasting at VHf ITU-R 641 : 1990, Determination of radio-frequency protection ratios for frequency-modulated sound broadcasting ITU-R 704: 1990, Characteristics of FM sound broadcasting reference receivers for planning purposes P
37、age 5 EN 61603-3 : 1998 1.3 Definitions For the purpose of this part of IEC 61603, the definitions given in part 1 apply. 2 Explanation of terms and general information 2.1 Transmitter A transmitter (link A-B in figure 2) has an audio signal input (analogue or digital), and a special form of electri
38、cal output to feed a radiator. 2.2 Combined transmitter and radiator A combined transmitter and radiator (link A-C in figure 2) 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 2) has a special form of electrical
39、input, to be fed by a transmitter. A radiator may be combined with other functions, such as a transmitter. At present, radiators normally consist of a number (from ten and more) of infra-red emitting diodes (IREDs) employing different technologies. These devices have peak emissions in the wavelength
40、 range 830 nm to 950 nrn, and an IR bandwidth of about 100 nm. 2.4 Receiver Besides the general characteristics given in part 1 and shown as link C-D in figure 2, others may need to be specified if a receiver is combined with other units to serve, for example, as a transmitter for up-stream signals
41、in a duplex system. 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 subca
42、rrier 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 IEC60315-4 and ITU-R 412.641 and 704. NOTE - For digital audio
43、 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 the system. The manufacturer should specify all the data necessary for correct operation and mainte
44、nance. Page 6 EN 61603-3 1998 2.6 Transmission of audio signals 2.6.1 Analogue audio signals Due to its technical performance and bandwidth economy, frequency modulation multiplex is mainly used for multichannel operation and is, at present, the only technique for which compatible equipment is avail
45、able from different manufacturers. With this modulation technique, the transmitter output signal consists of a group of modulated subcarriers; this frequency-division multiplex makes economic use of the available bandwidth. Pulse modulation may be used for the transmission of analogue signals, usual
46、ly employing pulses whose duration is less than 1 ps. This technique requires a wide transmission channel, but allows the use of very low average IR power. At present, equipment supplied by different manufacturers is seldom compatible. The types of modulation in use include differential pulse positi
47、on modulation (where the timing of a pulse is determined relative to that of the preceding pulse, so that a floating time raster is employed), pulse frequency modulation with variable carrier frequency, and pulse amplitude modulation (providing six modulation channels). In gen- eral, present pulse m
48、odulation systems provide fewer channels usable in the same space than FM systems can provide. 2.6.2 Digital audio signals Under consideration. 2.7 Electromagnetic compatibility General information is given in part 1 of IEC 61603. Extensive information on inter-system interference and interference f
49、rom other sources of IR is given in IEC 61 147. For electromagnetic compatibility, reference is made to the IEC generic standards being prepared by CISPR and IEC TC 77. 2.8 Safety aspects Safety is dealt with in part 1 of IEC 61603. It should be noted that systems within the scope of this part use radiators which give a high concentration of IR power at short distances, but the spatial average power is low. 2.9 Future developments in modulation techniques While systems using frequency modulation and systems using several different forms of
