1、 ETSI EN 303 348 V1.1.2 (2017-07) Induction loop systems intended to assist the hearing impaired in the frequency range 10 Hz to 9 kHz; Harmonised Standard covering the essential requirements of article 3.2 of Directive 2014/53/EU HARMONISED EUROPEAN STANDARD ETSI ETSI EN 303 348 V1.1.2 (2017-07) 2
2、Reference DEN/ERM-TG17WG3-16 Keywords harmonised standard, hearing aid, inductive ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Gras
3、se (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified wit
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9、 348 V1.1.2 (2017-07) 3 Contents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g3Introduction 6g31 Scope 7g32 References 7g32.1 Normative references . 7g32.2 Informative references 7g33 Definitions, symbols and abbreviations . 8g33.1 Definitions 8g33.2 Symbols 10g33.3 Abbrev
10、iations . 10g34 Technical requirements specifications . 11g34.1 Environmental conditions . 11g34.1.1 Environmental profile . 11g34.2 General requirements . 11g34.2.1 Presentation of induction loop amplifier equipment for testing purposes . 11g34.2.2 Choice of model for testing 11g34.2.3 Controls 11g
11、34.2.4 Amplifier shut-off facility . 12g34.2.5 Declarations by the manufacturer . 12g34.2.6 Auxiliary test equipment . 12g35 Testing for compliance with technical requirements 12g35.1 Environmental conditions for testing . 12g35.1.1 General requirements 12g35.1.2 Normal temperature and humidity 12g3
12、5.1.3 Test power source . 12g35.1.3.1 General requirements 12g35.1.3.2 External test power source 13g35.1.3.3 Internal test power source . 13g35.1.3.3.1 General 13g35.1.3.3.2 Mains voltage 13g35.1.3.3.3 Valve-regulated lead-acid battery power sources 13g35.1.3.3.4 Other power sources 13g35.2 General
13、 conditions 13g35.2.1 Normal test signals 13g35.2.1.1 Signal input for testing 14g35.2.2 Loop connections 14g35.2.2.1 General 14g35.2.2.2 Artificial loop 14g35.2.3 Measuring receiver . 14g35.3 Induction loop amplifier . 15g35.3.1 General 15g35.3.2 Induction loop amplifier definitions . 15g35.3.2.1 G
14、eneral 15g35.3.2.2 Product Classes . 15g35.3.3 Audio frequency in band and out of band emission limits 16g35.3.3.1 Definition 16g35.3.3.2 Methods of measurement 16g35.3.3.3 Limits 17g35.3.4 Spurious domain emission limits 17g35.3.4.1 Definition 17g35.3.4.2 Methods of measurement 17g3ETSI ETSI EN 303
15、 348 V1.1.2 (2017-07) 4 5.3.4.3 Limits 17g35.4 Induction loop receiver . 18g35.4.1 General 18g35.4.2 Headphone output . 18g35.4.3 Induction loop receiver definitions . 18g35.4.4 Methods of measurement 18g35.4.5 Limits 18g35.5 Interpretation of the measurement results 19g3Annex A (informative): Relat
16、ionship between the present document and the essential requirements of Directive 2014/53/EU . 20g3Annex B (informative): Technical overview 21g3B.1 Induction loop amplifiers . 21g3B.1.1 General . 21g3B.1.2 Frequency response 21g3B.1.3 Field strength 21g3B.1.4 General performance criteria 21g3B.2 Ind
17、uction loop receivers and test equipment 21g3B.2.1 General . 21g3B.2.2 Sensitivity . 22g3Annex C (normative): Measurement 23g3C.1 Standard test position to be used with internal loop equipment or equipment having a loop connector 23g3Annex D (normative): The relationship between loop current and H-F
18、ield strength 24g3Annex E (informative): Artificial loop 26g3Annex F (normative): Induction loop amplifier emission levels and spectrum mask measurements . 28g3Annex G (informative): Determination and use of the measurement bandwidth . 29g3Annex H (informative): Bibliography . 30g3Annex I (informati
19、ve): Change history . 31g3History 32g3ETSI ETSI EN 303 348 V1.1.2 (2017-07) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI member
20、s and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.o
21、rg/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the p
22、resent document. Foreword This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM). The present document has been prepared under the Commissions standardisation request C(2015) 5376 final i.8 to provide one vo
23、luntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC i.1. Once the present document is cited in the Official Journal
24、of the European Union under that Directive, compliance with the normative clauses of the present document given in table A.1 confers, within the limits of the scope of the present document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated EF
25、TA regulations. National transposition dates Date of adoption of this EN: 17 July 2017 Date of latest announcement of this EN (doa): 31 October 2017 Date of latest publication of new National Standard or endorsement of this EN (dop/e): 30 April 2018 Date of withdrawal of any conflicting National Sta
26、ndard (dow): 30 April 2019 Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provision
27、s). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI EN 303 348 V1.1.2 (2017-07) 6 Introduction Audio Frequency Induction Loop Systems (AFILS) have been on the market since the middle of the twentieth century, with the first recognizable paten
28、ts appearing circa 1938. AFILS are primarily used to facilitate improved communication to people with impaired hearing and are an important tool in the reduction of discrimination against disabled people. The present document represents the performance of equipment which is currently on the market,
29、which has not previously been subjected to compliance to a “radio“ directive. AFILS are installed in places of worship, places of entertainment, places of education, ticket booths and service counters, etc., as well as in domestic situations, providing huge benefits to users with impaired hearing. A
30、FILS provide an audio frequency magnetic field that couples with a receiving coil (Telecoil) fitted in hearing aids, cochlear implants, loop listeners and testing devices. This magnetic field is generated in a wire loop that is fed by an audio frequency amplifier which is capable of driving current
31、through the “induction loop“ which, in turn, is fed from external signals such as those generated by microphones, audio-visual equipment and musical instruments. AFILS operate below 9 kHz and have a very limited range (some few metres) and there is no known evidence of interference with radio equipm
32、ent. The market for AFILS is relatively small compared with technologies such as RFID, and is physically separated from most radio systems, so the opportunity for mutual interference problems is reduced compared to other users of the spectrum in this frequency range. The present document has been de
33、veloped in response to Directive 2014/53/EU i.1, which is the first radio standard that has been produced for AFILS equipment and has been prepared to allow the assessment of audio frequency induction loop amplifiers and receivers for compliance with Directive 2014/53/EU i.1. ETSI ETSI EN 303 348 V1
34、.1.2 (2017-07) 7 1 Scope The present document specifies technical characteristics and methods of measurements for audio frequency induction loop amplifiers and receivers operating from 10 Hz to 9 kHz used in audio frequency induction loop systems (AFILS). NOTE: The object of an AFILS is to transmit
35、an audio signal to people with hearing difficulties. The receiver in this case is normally a hearing aid with a built in telecoil. These radio equipment types are capable of operating in the frequency band within the 10 Hz to 9 kHz range: either with an output connection(s) and dedicated loop(s) or
36、with an internal loop(s); for audio frequency baseband transmission (un-modulated and without the use of a carrier). The present document covers fixed induction loop amplifiers, mobile induction loop amplifiers and portable induction loop amplifiers. The present document covers the essential require
37、ments of article 3.2 of Directive 2014/53/EU i.1 under the conditions identified in annex A. 2 References 2.1 Normative references References are specific, identified by date of publication and/or edition number or version number. Only the cited version applies. Referenced documents which are not fo
38、und to be publicly available in the expected location might be found at https:/docbox.etsi.org/Reference/. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for th
39、e application of the present document. 1 Void. 2 CEPT/ERC/Recommendation 74-01E (Sifok 98, Nice 99, Sesimbra 02, Hradec Kralove 05, Cardiff 11): “Unwanted Emissions in the Spurious Domain“. 2.2 Informative references References are either specific (identified by date of publication and/or edition nu
40、mber or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, E
41、TSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 o
42、n the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC. i.2 CEPT/ERC/REC 70-03: “Relating to the use of Short Range Devices (SRD)“. ETSI ETSI EN 303 348 V1.1.2 (2017-07) 8 i.3 CISPR 16-2-3: “Specificati
43、on for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance measurements“. i.4 IEC 60118-4: “Electroacoustics - Hearing aids - Part 4: Induction loop systems for hearing aid purposes - Magnetic field str
44、ength“. i.5 IEC 62489-1 + Amd 1: “Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 1: Methods of measuring and specifying the performance of system components“. i.6 IEC 61672-1: “Electroacoustics. Sound level meters. Specifications“. i.7 IEC 60268-10: “Sound syst
45、em equipment. Methods for specifying and measuring the characteristics of peak programme level meters“. i.8 Commission Implementing Decision C(2015) 5376 final of 4.8.2015 on a standardisation request to the European Committee for Electrotechnical Standardisation and to the European Telecommunicatio
46、ns Standards Institute as regards radio equipment in support of Directive 2014/53/EU of the European Parliament and of the Council. i.9 ETSI TR 100 028 (all parts) (V1.4.1) (12-2001): “Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio eq
47、uipment characteristics“. i.10 ETSI TR 100 028-2 (V1.4.1) (12-2001): “Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics; Part 2“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the
48、present document, the terms and definitions given in Directive 2014/53/EU i.1 and the following apply: artificial loop: reduced size radiating dummy load equal to the nominal impedance of the loop specified by the manufacturer Audio Frequency Induction Loop System (AFILS): system including induction
49、 loop amplifier(s), microphones and/or other signal sources, in which a magnetic field is created by the flow of audio-frequency current in a conductor arranged in the form of a loop or coil conducted measurements: measurements that are made using a direct connection to the equipment under test customized loop: loop built according to manufacturers loop design rules inside tested limits dedicated loop: removable loop supplied and type tested with the AFILS equipment, designed as an indispensable part of the equipment NOTE: The loop h
