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Norma Italiana
N O R M A I T A L I A N A C E I
CNR CONSIGLIO NAZIONALE DELLE RICERCHE AEI ASSOCIAZIONE ELETTROTECNICA ED ELETTRONICA ITALIANA
Data Pubblicazione Edizione
Classificazione Fascicolo
COMITATO
ELETTROTECNICO
ITALIANO
Titolo
Title
CEI EN 61603-2
1998-11 Prima
100-28 4852E
Trasmissione di segnali audio e/o video e simili a mezzo di radiazioni
infrarosseParte 2: Sistemi di trasmissione audio a larga banda e segnalisimilari
Transmission of audio and/or video and related signals using infra-red radiation
Part 2: Transmission systems for audio wide band and related signals
TELECOMUNICAZIONI E TECNOLOGIA DELLINFORMAZIONE
NORMA
TE
CNICA
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CEI - Milano 1998. Riproduzione vietata.Tutti i diritti sono riservati. Nessuna parte del presente Documento pu essere riprodotta o diffusa con un mezzo qualsiasi senza il consenso scritto del CEI.Le Norme CEI sono revisionate, quando necessario, con la pubblicazione sia di nuove edizioni sia di varianti. importante pertanto che gli utenti delle stesse si accertino di essere in possesso dellultima edizione o variante.
SOMMARIO
La presente parte della Norma descrive i metodi di misura e di specifica di quelle caratteristiche dei si-stemi di trasmissione audio a larga banda mediante radiazioni infrarosse (IR) non coperti dalla parte 1della Norma stessa.La presente EN viene pubblicata dal CEI nella sola lingua originale inglese, a causa della limitata utilizza-zione, particolarmente mirata a settori specialistici.
DESCRITTORI DESCRIPTORS
Trasmissione sonora Sound transmission;Apparecchiatura elettroacustica Electroacoustic equipment;Radiazione infrarossa Infrared radiation;Apparecchiature audio e/o video Household appliances;Specifiche Specification;Misure Measurements;Caratteristiche Characteristics;Valutazione delleprestazioni Performance evaluation;Compatibilit elettromagnetica Electromagnetic compatibility;Marcatura Marking;
COLLEGAMENTI/RELAZIONI TRA DOCUMENTI
Nazionali (SOC) CEI 84-13:1997-10;
Europei (IDT) EN 61603-2:1997-05;
Internazionali (IDT) IEC 61603-2:1997-03;
Legislativi
INFORMAZIONI EDITORIALI
Norma Italiana CEI EN 61603-2 Pubblicazione Norma Tecnica Carattere Doc.
Stato Edizione In vigore Data validit 1999-1-1 Ambito validit Europeo e Internazionale
Varianti Nessuna
Ed. Prec. Fasc. Nessuna
Comitato Tecnico 100-Sistemi e apparecchiature audio, video e multimediali (ex CT 84/60, SC 12A, SC 12G)
Approvata dal Presidente del CEI in Data 1998-11-5
CENELEC in Data 1997-3-11
Sottoposta a inchiesta pubblica come Documento originale Chiusa in data 1997-1-31
Gruppo Abb. 8 Sezioni Abb. C
ICS 33.160.99;
CDU
LEGENDA
(SOC) La Norma in oggetto sostituisce completamente le Norme indicate dopo il riferimento (SOC)
(IDT) La Norma in oggetto identica alle Norme indicate dopo il riferimento (IDT)
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CENELEC members are bound to comply with theCEN/CENELEC Internal Regulations which stipulatethe conditions for giving this European Standard thestatus of a National Standard without any alteration.
Up-to-date lists and bibliographical references con-
cerning such National Standards may be obtained onapplication to the Central Secretariat or to anyCENELEC member.
This European Standard exists in three official ver-sions (English, French, German).
A version in any other language and notified to theCENELEC Central Secretariat has the same status asthe official versions.
CENELEC members are the national electrotechnicalcommittees of: Austria, Belgium, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Lu-xembourg, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and United Kingdom.
I Comitati Nazionali membri del CENELEC sono tenu-ti, in accordo col regolamento interno del CEN/CENE-LEC, ad adottare questa Norma Europea, senza alcunamodifica, come Norma Nazionale.
Gli elenchi aggiornati e i relativi riferimenti di tali Nor-
me Nazionali possono essere ottenuti rivolgendosi alSegretario Centrale del CENELEC o agli uffici di qual-siasi Comitato Nazionale membro.
La presente Norma Europea esiste in tre versioni uffi-ciali (inglese, francese, tedesco).
Una traduzione effettuata da un altro Paese membro,sotto la sua responsabilit, nella sua lingua nazionalee notificata al CENELEC, ha la medesima validit.
I membri del CENELEC sono i Comitati ElettrotecniciNazionali dei seguenti Paesi: Austria, Belgio, Dani-marca, Finlandia, Francia, Germania, Grecia, Irlanda,Islanda, Italia, Lussemburgo, Norvegia, Olanda, Por-togallo, Regno Unito, Spagna, Svezia e Svizzera.
CENELEC Copyright reserved to all CENELEC members. I diritti di riproduzione di questa Norma Europea sono riservati esclu-
sivamente ai membri nazionali del CENELEC.
Comitato Europeo di Normalizzazione Elettrotecnica
European Committee for Electrotechnical Standardization
Comit Europen de Normalisation Electrotechnique
Europisches Komitee fr Elektrotechnische Normung
C E N E L E CSecrtariat Central:
rue de Stassart 35, B - 1050 Bruxelles
E u r o p i s c h e N o r m N o r m e E u r o p e n n e E u r o p e a n S t a n d a r d N o r m a E u r o p e a
EN 61603-2:1997-05
Sostituisce il documento HD 455 S 1 (1985)
Trasmissione di segnali audio e/o video e simili a mezzo di radiazioni
infrarosseParte 2: Sistemi di trasmissione audio a larga banda e segnalisimilari
Transmission of audio and/or video and related signals using infra-red radiation
Part 2: Transmission systems for audio wide band and related signals
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CONTENTS
Rif. Topic Pag .
NORMA TECNICA
CEI EN 61603-2:1998-11
Pagina iv
1 GENERAL 1
1.1 Scope ................................................................................................................................................................................................ 1
1.2 Normative references ............................................................................................................................................................ 1
1.3 Definitions ..................................................................................................................................................................................... 1
2 EXPLANATION OF TERMS AND GENERAL INFORMATION 1
2.1 Transmitter .................................................................................................................................................................................... 1
2.2 Combined transmitter and radiator ............................................................................................................................. 1
2.3 Radiator ........................................................................................................................................................................................... 2
2.4 Receiver .......................................................................................................................................................................................... 2
2.5 Ancillary equipment ............................................................................................................................................................... 2
2.6 Transmission of audio signals ........................................................................................................................................ 2
2.7 Electromagnetic compatibility........................................................................................................................................ 3
2.8 Safety aspects .............................................................................................................................................................................. 3
3 SYSTEM CONSIDERATIONS 3
3.1 Area of application ................................................................................................................................................................. 3
3.2 Operating environment ....................................................................................................................................................... 3
3.3 Household and professional-use equipment ....................................................................................................... 3
3.4 System planning and installation .................................................................................................................................. 3
3.5 Partition of functions between elements of the system ............................................................................... 4
4 GENERAL CONDITIONS FOR MEASUREMENTS 4
4.1 Electrical input to the transmitter ................................................................................................................................. 4
5 CHARACTERISTICS TO BE SPECIFIED AND THEIR METHODS OF MEASUREMENT 5
5.1 Characteristics of the IR source ..................................................................................................................................... 5
5.2 Characteristics of the receiver ......................................................................................................................................... 5
6 INTERFACE (MATCHING) VALUES, PERFORMANCE REQUIREMENTSAND RECOMMENDATIONS 6
6.1 Interface values for transmitter output signals ................................................................................................... 6
6.2 Interface values for radiator input signals ............................................................................................................. 6
6.3 Polarity............................................................................................................................................................................................. 7
6.4 Spurious emissions and signals ..................................................................................................................................... 7
6.5 Sensitivity for random incidence .................................................................................................................................. 7
6.6 Rated signal-to-noise ratio ................................................................................................................................................. 7
6.7 IR wavelength range .............................................................................................................................................................. 7
6.8 Channel allocations and modulation characteristics ...................................................................................... 8
6.9 Interface values for audio signals .............................................................................................................................. 11
6.10 Overall audio frequency performance requirements .................................................................................. 11
7 MARKING AND CONTENTS OF SPECIFICATIONS 12
7.1 Marking ......................................................................................................................................................................................... 12
7.2 Contents of specifications ................................................................................................................................................ 12
A N N E X
ZA normative Normative references to international publicationswith their corresponding European publications 15
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Pagina v
FOREWORD
The text of document 100C/37/FDIS, future edition 1 of IEC 61603-2, prepared bySC 100C, Audio, video and multimedia subsystems and equipment, ofIEC TC 100, Audio, video and multimedia Systems and equipment, was submit-ted to the IEC-CENELEC parallel vote and was approved by CENELEC asEN 61603-2 on 1997/03/11.
This European Standard supersedes HD 455 S1:1985.
This standard is to be used in conjunction with ENV 50185-1:1995.
The following dates were fixed:
latest date by which the EN has to be implemented at national level by publi-cation of an identical national standard or by endorsement(dop) 1997/12/01
latest date by which the national standards conflicting with the EN have to bewithdrawn(dow) 1997/12/01
Annexes designated 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 61603-2:1997 was approved byCENELEC as a European Standard without any modification.
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Pagina 1 di 18
1 GENERAL
1.1 Scope
This part of IEC 61603 gives methods for measuring and specifying those charac-teristics of wide band audio IR transmission systems not covered by part 1 of thisstandard (see also 3.1). It allows systems which make different economic use ofthe available bandwidth to be described in order that conclusions regarding in-terference and compatibility can be drawn. Interface (matching) values and othersystem characteristics are also covered. This part of IEC 61603 replaces chapter 1of 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 referencein this text, constitute provisions of this part of IEC 61603. At the time of publica-tion, the editions indicated were valid. All normative documents are subject to re-
vision, and parties to agreements based on this part of IEC 61603 are encouragedto investigate the possibility of applying the most recent editions of the norma-tive documents indicated below(1). Members of IEC and ISO maintain registers ofcurrently valid International Standards.
1.3 Definitions
For the purpose of this part of IEC 1603, the definitions given in part 1 of thisstandard 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 minimumupper frequency of 12,5 kHz (system response loss 5 dB see IEC 581-8). It further includesaudio 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 digit-al), 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 elec-trical output, and interface values therefore apply only at the input.
(1) Editors Note: For the list of Publications, see Annex ZA.
CEI EN 61603-2:1998-11
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2.3 Radiator
A radiator (link B-C in figure 1) may be combined with other functions, such as atransmitter. At present, radiators normally consist of a number of IREDs employ-ing different technologies. These devices have peak emissions in the wavelengthrange 830 nm to 950 nm, and an IR bandwidth of about 100 nm.
2.4 Receiver
Besides the general characteristics given in part 1 of this standard, others mayneed to be specified if a receiver (link C-D in figure 1) is combined with otherfunctions, such as earphones, to form an IR headphone.
To eliminate interference from other modulated IR sources, the receiver shallprovide enough selectivity with regard to the modulated subcarrier in addition toselectivity in the IR band. Normally this selectivity shall correspond to the spec-tral bandwidth of the modulated subcarrier signal, with some margin for instabil-ities and possible extra features.
Definitions and methods of measurement for selectivity in relation to analogueFM 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 re-quired for the operation of a system. The manufacturer should specify all thedata necessary for correct operation and maintenance.
2.6 Transmission of audio signals
2.6.1 Analogue audio signalsSeveral different modulation techniques may be used for audio wide band sig-nals in systems using infra-red as a carrier. Intersystem interference within thelimited subcarrier frequency range shall be avoided. The applications includeheadphones, loudspeaker systems, wireless microphones and audio links be-tween distributed audio equipment.
Due to its technical performance and bandwidth economy, FM multiplex modu-lation is mainly used for multichannel operation in audio wide band systems, andis at present the only technique for which compatible equipment is availablefrom different manufacturers.
With this modulation technique, the transmitter output signal consists of one ormore modulated subcarriers; this frequency-division multiplex makes economicuse of the available bandwidth.
Pulse modulation may be used for the transmission of analogue signals, usuallyemploying pulses of duration less than 1 ms. At present, equipment supplied bydifferent manufacturers is seldom compatible.
2.6.2 Digital audio signals
General information is given in part 1 of this standard. For use in audio wideband 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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2.7 Electromagnetic compatibility
General information is given in part 1 of this standard. Extensive information onintersystem interference and interference from other sources of IR is given inIEC 1147.
For electromagnetic compatibility, the requirements of CISPR 13 and CISPR 20shall 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 tohigh fidelity audio signals in the home. It also applies where the high audio qual-ity is needed for another purpose, such as for musical playback during record-ings, for language or speech training, for audio distribution to a large audience intheatres or opera houses, or, in some countries, for bilingual systems in publicbuildings.
3.2 Operating environment
The environmental conditions for the equipment are defined in the relevantstandards for the individual units. Unless otherwise specified, the equipmentshould operate at least within the temperature range 5C to 40C 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 con-densation.
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 in-doors, and they have the advantage that they operate without interfering withsystems in adjacent rooms.
Household equipment is usually treated with considerable care, and cost is a
prime consideration. Professional-use equipment, however, installed in publicbuildings, is often carelessly treated and, for adequate reliability, requires to berobust. This applies, for example, to connectors.
3.4 System planning and installation
Household applications are relatively inexpensive, so the risk of wasting a largeexpenditure on an incorrect installation is low, but applications for large audienc-es can be very costly. Therefore, it is essential that the manufacturers planningand installation instructions, such as the correct arrangement of radiators or ofscreening against direct sunlight, should be observed. Special caution is advisedconcerning disturbances caused by artificial light sources, especially HF driven
fluorescent lamps with dimming capability.
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3.5 Partition of functions between elements of the system
3.5.1 General
As IR transmission equipment is used in rooms of very different sizes, it is availa-ble in various combinations of the functional elements. Household applicationsusually need only a few elements of small size which are easily installed, where-as for an installation in a large auditorium, it is necessary to consider the func-
tional elements separately with regard to cost and to the effort needed to installthem.
3.5.2 Household applications
For household applications, the three elements of the transmission chain (seefigure 1) are usually combined into two. The transmitter and radiator form asmall unit, sometimes further combined with a microphone to form a single unit.The receiver can also be combined with transducers for sound reproduction,such as one or two earphones to form an IR headphone.
3.5.3 Application in large rooms
In systems intended for use in large rooms, economic and technical considera-tions indicate that it may be better to implement each function by means of aseparate element of the system, as shown in figure 1.
4 GENERAL CONDITIONS FOR MEASUREMENTS
4.1 Electrical input to the transmitter
If the manufacturer claims that the electrical input conforms to an IEC standard(such as IEC 933), the values specified in that standard shall be used. In othercases, the manufacturer shall specify the rated source voltage (or current) and therated source and load impedances.
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5 CHARACTERISTICS TO BE SPECIFIEDAND THEIR METHODS OF MEASUREMENT
5.1 Characteristics of the IR source
5.1.1 Output voltage of the transmitter
5.1.1.1 Characteristic to be specified
The output voltage of the transmitter when loaded by a terminating resistor,whose value is equal to the rated input impedance of the associated radiator.
5.1.1.2 Method of measurement
In FM systems, measure the unmodulated signal voltage across a terminating re-sistor of the value specified by the manufacturer, with a true r.m.s. meter havingadequate bandwidth. In pulse systems, measure the peak output voltage acrossthe terminating resistor using an oscilloscope of adequate bandwidth.
5.1.2 Spurious emissions and signals
5.1.2.1 Spurious IR emission
For the characteristic to be specified and the method of measurement, see part 1of this standard.
5.1.2.2 Spurious modulation signals
For the characteristic to be specified and the method of measurement, see part 1of this standard.
5.2 Characteristics of the receiver
5.2.1 Sensitivity to random incidence
5.2.1.1 Characteristic to be specified
The characteristic shall be specified in accordance with part 1 of this standardand in addition, for multichannel systems, the value for each channel shall bespecified to allow for differences.
5.2.1.2 Method of measurement
Follow the basic procedure given in part 1 of this standard, except that instead ofonly a single channel, the number of channels stated by the manufacturer for the
system shall be switched on. However, the audio modulation shall be appliedonly to the channel under test, using the rated modulation index as stated by themanufacturer. The subsequent steps shall be as for single channel systems.
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6 INTERFACE (MATCHING) VALUES, PERFORMANCE REQUIREMENTSAND RECOMMENDATIONS
6.1 Interface values for transmitter output signals
Note These specifications apply within the bandwidth used by the equipment.
6.1.1 Frequency modulation multiplex systems
The values for frequency modulation multiplex systems are as follows:
Transmitter output voltage, r.m.s. 1 V 6 dB(independent of the number of channels in operation)
Polarity of modulation (see part 1 of this standard) positive
Output source impedance 50 W
Load impedance (line termination) 50 W
Type of connector IEC 169-8 (BNC)
Note In addition to the preferred connector, conforming to IEC 169-8, others are in common use,mainly for low-cost consumer products, such as the F-connector (IEC 169-24) (75W). Adaptersdesigned to connect different types of connector are available.
6.1.2 Pulse modulation systems
For pulse modulation Systems, because of the many different types available, no fixedstandard can be established at present. The following values are given as examples.
Transmitter peak output voltage 0,5 V to 5 V (unipolar or bipolar with respect to 0 V)
Pulse duration 10 ns to 1 ms
Output source impedance 75 W
Load impedance 75 W
6.1.3 DC control or monitoring (on signal cables)
DC signals may be used for control or monitoring purposes, such as to indicate aradiator failure. The interface values for these applications are as follows:
DC output voltage for control purposes 1 kW
Type of connector IEC 169-8 (BNC)Note See note to 6.1.1.
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6.2.2 Pulse modulation systems
For pulse modulation systems, because of the many different types available, nofixed standard can be established at present. The following values are given asexamples.
Peak input voltage 0,5 V to 5 V (unipolar or bipolar with respect to 0 V)
Pulse duration 10 ns to 1 msInput impedance 75 W
6.2.3 DC control or monitoring (on signal cables)
The interface values for these applications are as follows:
Input voltage 0 to 12 V
Input impedance > 50 kW
Polarity positive(core with respect to screen for coaxial cables)
6.3 PolarityThe equipment shall conform to the requirements of part 1 of this standard.
6.4 Spurious emissions and signals
6.4.1 Spurious IR emissions
Systems covered by this part of IEC 1603 shall not produce any spurious IR emis-sion higher than 30 dB below the total power.
Note For the definition and method of measurement, see part 1 of this standard.
6.4.2 Spurious modulation signalsSystems covered by this part of IEC 1603 shall not produce any spurious modula-tion signal whose level exceeds 40 dB referred to the subcarrier level.
Note For the definition and method of measurement, see part 1 of this standard.
6.5 Sensitivity for random incidence
Systems using FM multiplex shall have an input sensitivity better than 2 mW/m 2
per channel for a S/N ratio of 26 dB. If the receiver mutes at a higher S/N ratio,this value shall be used for the measurement and stated with the results.
6.6 Rated signal-to-noise ratioThe rated S/N ratio of IR audio wide band and similar systems shall conform tothe relevant standard, such as IEC 581-8.
6.7 IR wavelength range
The wavelength for these systems shall be either between 800 nm and 900 nm,or between 900 nm and 1000 nm.
For general information, see part 1 of this standard.
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6.8 Channel allocations and modulation characteristics
6.8.1 Analogue transmission by frequency modulation
6.8.1.1 Channel allocations: requirements for new designs
New designs of audio wide band systems for analogue transmission by frequencymodulation shall use the subcarrier frequency ranges 0 MHz (formally) to 1 MHz
and 2 MHz to 6 MHz. The channels use the 100 kHz grid D in accordance withpart 1 of this standard, and two adjacent slots are combined into one transmis-sion channel of 200 kHz bandwidth. The numbering of the channels on the re-ceivers shall be in accordance with table 1, which shows the relations betweenchannel code, channel number and frequency. Carrier frequencies are located inthe centre of each slot: an offset within the tolerance of the carrier frequency andthe selectivity of the receiver may be used to minimize intermodulation effects.
For stereo transmission, the pairs of channels numbered 2 and 6, 4 and 8, 22 and26, 24 and 28, 30 and 34, 32 and 36, etc. shall be used, and the left channel shallbe that with the lower carrier frequency.
Notes: 1 The pair 4 and 8 can be used only if no interference at the IF of AM broadcast or some IR
receivers is likely to occur.2 For the high band 2 MHz to 6 MHz, a channel bandwidth of 200 kHz is anticipated.
3 The combination of these high band channels to form stereo pairs is under consideration.This combination depends on selectivity aspects. The most obvious procedure of combiningtwo adjacent 200 kHz slots to form one stereo channel demands high selectivity even whenonly one stereo signal is used. A combination of two channels 2 MHz apart avoids this, butmay have other disadvantages.
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Tab. 1 Channel code, channel identification number and subcarrier frequency
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6.8.1.2 Channel allocations: accommodation of existing designs
Existing products in the D-band do not make full use of this band in the mosteconomic way, which gives a maximum of 20 channels, but locate only eight car-riers in this range. They use frequency offsets of 50 kHz with respect to carriersin the D-band. However, with regard to the potential availability of low-cost com-ponents, it was accepted to include these allocations in this standard, so that ex-isting systems can continue to conform to this standard, at least until better use of
the band is implemented.To distinguish this allocation from that of table 1, the channel identification codeincludes the letter H (for high band) followed by a carrier number 1 to 8 in ac-cordance with table 2. Table 2 also shows the reference to the allocation in ac-cordance with table 1, indicating a shift of 50 kHz by a dash(-) after the channelidentification number.
In this allocation, the left channels for stereo signals are those with odd numbers(H1, H3, H5, H7) and the right channels are those with even numbers (H2, H4,H6, H8), every two adjacent channels forming one stereo pair.
Tab. 2 Channel code, channel identification code and subcarrier frequencies for high band
channel set H1 to H8, and related data from D-band allocation
6.8.1.3 Analogue FM modulation characteristics
The following values for the D-System shall be used for new designs. The values
for the existing H-System are given for information, and should be used wherecompatibility with an existing system is necessary.
6.8.2 Analogue transmission by pulse modulation
6.8.2.1 Channel allocation: recommendations for new designs
For pulse modulation systems, with or without a carrier, using pulse durations of1 ms or less, channel grid G (for 4 MHz channels, see part 1 of this standard), orbeyond, is most suitable.
Code H1 H2 H3 H4 H5 H6 H7 H8
Frequency kHz 2300 2800 3200 3700 4300 4800 5200 5700
Code D23 D28 D32 D37 D43 D48 D52 D57
Identificationnumber
23 28 32 37 43 48 52 57
Note A graphical presentation of table 2 is given in figure 3,
H-System D-System
Subcarrier modulation FM FM
Maximum deviation 150 kHz 50 kHz
Pre-emphasis 75 ms 50 ms
Polarity positive positive
(a positive-going audio signal produces an increase in subcarrier frequency)
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6.8.3 Digital audio transmission
6.8.3.1 Channel allocation: recommendations for new designs
Digital IR audio transmission should use the frequency range 2 MHz to 6 MHz,corresponding to grid slots F2 to F5. It shares this range with analogue audio ap-plications, so that care shall taken to avoid interference with any such applica-tions being used simultaneously.
Depending on the bit rate of the digital signal, two different channel bandwidthsare possible. At full bit-rate with 16 bit resolution the channel bandwidth is3 MHz, whereas for bit-rate reduced stereo signals the channels are 1 MHz wide.Table 3 shows the carrier allocation, band code and channel identification codefor both types of signal.
Tab. 3 Channel code, channel identification code and subcarrier frequencies for digital audiotransmission with full 16 bit (right) and data-reduced signals (left)
6.8.3.2 Modulation characteristics
The recommended modulation characteristics are as follows:
6.9 Interface values for audio signalsThe interface values shall conform to IEC 268-15 or other applicable IEC stand-ards.
6.10 Overall audio frequency performance requirements
The overall performance from audio input to audio output shall conform to therelevant standards for the particular application. High fidelity applications shallconform to IEC 581-8.
Code F3 F4 F5 F4
Identification code 1F 2F 3F none (singlestereo channel)
Frequency (MHz) 3,5 4,5 5,5 4,5
Note A graphical presentation of table 3 is given in figure 4.
Full data Bit-reduced
Type of modulation under consideration under consideration
Channel bandwidth 3 MHz 1 MHz
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7 MARKING AND CONTENTS OF SPECIFICATIONS
7.1 Marking
Equipment shall be adequately marked to give information regarding its func-tions and characteristics. Terminals and controls shall be marked with standardIEC/ISO symbols, where they exist (see IEC 417 and ISO 7000). The polarity shallbe marked at terminals carrying d.c.
The equipment shall be clearly marked with all the data marked X in column Aof table 4, and that marked X in column B of table 3 of part 1 of this standard.The classification scheme for systems and equipment is specified in part 1 of thisstandard.
7.2 Contents of specifications
The specification of the product shall include all the data marked X in column Bof table 4, and that marked X in table 3 of part 1 of this standard. The provisionof data marked R in either table is optional, but recommended.
Tab. 4 Marking and contents of specifications
Clause/Subclause
Characteristic A B
6.1.1 or 6.1.2 or 6.1.3 Interface values for transmitter output signals X
6.2.1 or 6.2.2 or 6.2.3 Interface values for radiator input signals X
6.3 Polarity of IR output X
6.4.1 Spurious IR emissions X
6.4.2 Spurious modulation signals X
6.5 Sensitivity for random incidence X
6.5 S/N ratio at which the receiver mutes X
6.6 Rated signal-to-noise ratio R
6.8.1.1 or 6.8.1.2 or6.8.2.1 or 6.8.3.1
Channel identification number X
6.6.1.1 or 6.B.1.2 or6.8.2.1 or 6.8.3.1
Channel carrier frequency R
6.8.1.3 or 6.8.3.2 Modulation characteristics X
6.9 Interface values for audio signals X
IEC 1603-1 Type classification X
A = data which shall appear on the equipment
B = data which shall be specified in the manufacturers specificationX = mandatory
R = recommended
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Fig. 1 Signal chain and related IEC standards
Fig. 2 Allocation of channels and recommended carriers L for audio band application in ac-
cordance with table 1
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Fig. 3 Allocation of channels and recommended carriers H1 to H8 for audio wide band appli-cation in accordance with table 2
Fig. 4 Allocation of channels and recommended carriers codes for digital audio applicationin accordance with table 3
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A N N E X
ZA normative Normative references to international publicationswith their corresponding European publications
This European Standard incorporates by dated or undated reference, provisionsfrom other publications. These normative references are cited at the appropriateplaces 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. Forundated references the latest edition of the publication referred to applies (in-cluding 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 68-2 series Environmental testingPart 2: Tests
EN 60068-2HD 323.2
seriesseries
IEC 169-8 1978 Radio-frequency connectorsPart 8: R.F. coaxial connectors with innerdiameter of outer conductor 6,5 mm
(0,256 in) with bayonet lockCharacteristic impedance 50 ohms(Type BNC)
IEC 169-24 1991 Part 24: Radio-frequency coaxial connectorswith screw coupling, typically for use in 75ohm cable distribution systems (Type F)
EN 60169-24 1993
IEC 268-15 1996(1) Sound system equipmentPart 15: Preferred matching values for theinterconnection of sound system compo-nents
IEC 315-4 1982 Methods of measurement on radio receiv-ers for various classes of emissionPart 4: Radio-frequency measurements onreceivers for frequency modulated sound-broadcasting emissions
IEC 581-2 1986 High fidelity audio equipment and systemsMinimum performance requirementsPart 2: FM radio tuners
IEC 581-8 1986 Part 8: Combination equipment
IEC 933 series Audio, video and audiovisual systemsInterconnections and matching values
EN 60933 series
IEC 1147 1993 Uses of infra-red transmission and the pre-vention or control of interference betweensystems
IEC 61603-1 1997 Transmission of audio and/or video and re-lated signals using infra-red radiationPart 1: General
EN 61603-1 1997
CISPR 1 3 1996(2) Limits and methods of measurement of ra-dio interference characteristics of soundand television broadcast receivers and as-sociated equipment
(1) IEC 268-15:1987 + A1:1989 + A2:1990 + A3:1991 are harmonized as HD 483.15 S4:1992.
(2) EN 55013:1990 (CISPR 13:1975 + A1:1983, mod.) + A12:1994 + A13:1996 applies.The title of EN 55013 is: Limits and methods of measurement of radio disturbance characteristics of broadcastreceivers and associated equipment.
(3) Instead of CISPR 20:1996, EN 55020:1994 + corr. Jan. 1996 + A11:1996, Electromagnetic immunity of broad-cast receivers and associated equipment, applies.
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CISPR 20 1996(3) Limits and methods of measurement of im-munity characteristics of sound and televi-sion broadcast receivers and associatedequipment
ITU-RRecommendation412-6
1994 Planning standards for FM sound broad-casting at VHF
ITU-RRecommendation641
1994 Determination of radio-frequency protec-tion ratios for frequency-modulated soundbroadcasting
ITU-RRecommendation704
1994 Characteristics of FM sound broadcastingreference receivers for planning purposes
Publication Year Title EN/HD Year
(1) IEC 268-15:1987 + A1:1989 + A2:1990 + A3:1991 are harmonized as HD 483.15 S4:1992.(2) EN 55013:1990 (CISPR 13:1975 + A1:1983, mod.) + A12:1994 + A13:1996 applies.
The title of EN 55013 is: Limits and methods of measurement of radio disturbance characteristics of broadcastreceivers and associated equipment.
(3) Instead of CISPR 20:1996, EN 55020:1994 + corr. Jan. 1996 + A11:1996, Electromagnetic immunity of broad-cast receivers and associated equipment, applies.
Fine Documento
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La presente Norma stata compilata dal Comitato Elettrotecnico Italianoe beneficia del riconoscimento di cui alla legge 1 Marzo 1968, n. 186.
Editore CEI, Comitato Elettrotecnico Italiano, Milano - Stampa in proprio
Autorizzazione del Tribunale di Milano N. 4093 del 24 luglio 1956Responsabile: Ing. E. Camagni
Lire 76.000
100 Sistemi e apparecchiature audio, video e multimediali (ex CT 84/60, SC 12A, SC 12G)
CEI EN 61603-1 (CEI 100-21)Trasmissione di segnali audio e video e similari mediante ra-diazione infrarossa Parte 1: Generalit