1、 ETSI ES 200 381-2 V1.1.1 (2012-10) Telephony for hearing impaired people; Inductive coupling of telephone earphones to hearing aids; Part 2: Cellular speech terminals floppy3ETSI Standard ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)2Reference DES/STQ-197 Keywords coupling, hearing aid, inductive, teleph
2、ony 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 Grasse (06) N 7803/88 Important notice Individual copies of the present document c
3、an be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, th
4、e reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI doc
5、uments is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written pe
6、rmission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2012. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Tra
7、de Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)3Contents Intellectual Property Rights 4g3Foreword . 4g31 Scope 5g32 References
8、 5g32.1 Normative references . 5g32.2 Informative references 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 6g34 Introduction 6g34.1 General . 6g34.2 Background 6g35 Requirements 6g35.1 Introduction 6g35.2 Signal intensity . 7g35.3 Frequency response 7g35.4 Signal qua
9、lity 7g36 Measurement procedures 7g36.1 Introduction 7g36.2 Test facilities, equipment and configurations . 7g36.3 Measurement procedures 8g3Annex A (normative): Excerpts from ANSI C63.19-2011 9g3Annex B (informative): Bibliography . 10g3History 11g3ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)4Intellectu
10、al 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 members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (I
11、PRs); 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 (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been
12、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 present document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Comm
13、ittee Speech and multimedia Transmission Quality (STQ). The present document is part 2 of a multi-part deliverable. Full details of the entire series can be found in part 1 2. ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)51 Scope The present document applies to wireless terminals designed to be used with
14、inductive coupling to hearing aids with a T-coil. It sets forth uniform methods of measurement and parametric requirements for the electromagnetic and operational compatibility of hearing aids used with wireless terminals, including cellular phones, and Voice-over-Internet-Protocol devices, operatin
15、g in the range of 698 MHz to 3 GHz. Other types of wireless technologies (e.g. Bluetoothradio technologies) are also used for coupling hearing aids with other equipments. They are out of the scope of the present document. 2 References References are either specific (identified by date of publication
16、 and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the e
17、xpected location might be found at http:/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. 2.1 Normative references The following referenced documents are necessary for the application
18、of the present document. 1 ANSI C63.19-2011: “American National Standard Methods of Measurement of Compatibility between Wireless Communication Devices and Hearing Aids“. Copyright 2011, IEEE. All rights reserved. 2 ETSI ES 200 381-1: “Telephony for hearing impaired people; Inductive coupling of tel
19、ephone earphones to hearing aids; Part 1: Fixed-line speech terminals“. 3 IEC 61672-2:2003: “Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests“. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they
20、 assist the user with regard to a particular subject area. Not applicable. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: A-weighting: acoustical weighting according to IEC 61672-2:2003 3 sound pressure level: acou
21、stic sound pressure level is expressed in decibels relative to 1 Pascal (or dBPa) ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)63.2 Abbreviations For the purposes of the present document, the following abbreviations apply, as defined in ANSI C63.19-2011 1: ABM1 Audio Band Magnetic signal desired ABM2 Audi
22、o Band Magnetic signal undesired 4 Introduction 4.1 General It is recognised that there is a sizeable proportion of mobile telephone users that have difficulty in conversing over a mobile telephone connection due to hearing loss. To alleviate these difficulties special means have been provided in ma
23、ny national systems to enable hearing impaired users to couple their hearing aids inductively to the mobile telephone receiver, and a number of national/international specifications define characteristics for this form of coupling. The present document addresses the requirements for successful induc
24、tive coupling of hearing aids to mobile telephone sets. Furthermore, it is also recognised that many hearing impaired users are able to have satisfactory mobile telephone conversations while coupling their hearing aids acoustically to the mobile telephone receiver, or even using the mobile telephone
25、 handset without a hearing aid. This latter situation is possible due to the fact that, under good conditions, a mobile telephone connection can be louder than a face-to-face conversation over a 1 metre air path by up to 30 dB. The inclusion of inductive coupling does not reduce or replace existing
26、technical standards that apply to a handset. Inductive coupling can be combined with other additional functionality, such as amplification or extra earpieces, provided specifically for people with special needs. 4.2 Background Magnetic induction systems incorporated in telephone handsets generate an
27、 alternating magnetic field with special characteristics which make the field detectable by hearing aids equipped with induction pick-up coils. Reception of an audio-frequency signal via an induction pick-up coil can often allow an acceptable signal-to-noise ratio to be achieved in cases where the a
28、coustical reception would otherwise be degraded by background noise. After an extensive review of global standards in this area it was determined that the most advanced work in this area has been carried out by the ANSI C63 committee, and documented in ANSI C63.19-2011 1. It was not found possible t
29、o reproduce the test procedures in the EN mainly due to the length of the documentation resulting from the complexity of the test procedure. As a result the present document will reference the relevant sections of ANSI C63.19-2011 1. The reason why the present document and ES 200 381-1 2 differ in c
30、omplexity and test methods is due to the fact that in normal operation a wireless terminal is generating an RF field which is used as the main communications link at the same time as the magnetic field passes the audio component to the hearing aid. More details are available in section 1 of ANSI C63
31、.19-2011 1. Performance of the wireless terminal based upon ANSI C63.19-2011 1 is reported in 4 classes that the hearing aid community can understand without having to know the technical background. These are rated from T1 to T4, T1 being the poorest, and T4 the best. 5 Requirements 5.1 Introduction
32、 The requirements for mobile and wireless phones that have a T-coil mode, shall meet all the following requirements: Signal intensity (defined as “field intensity of the desired signal at the center of the audio band“ in ANSI 63.19-201 1). ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)7 Frequency response
33、(defined as “frequency response of the desired signal measured across the audio band“ in ANSI 63.19-201 1). Signal quality (defined as “the difference between the desired and undesired magnetic fields“ in ANSI 63.19-201 1). 5.2 Signal intensity The wireless terminal under test shall meet the T-coil
34、magnetic signal intensity per section 8.3.1 of ANSI C63.19-2011 1. 5.3 Frequency response The wireless terminal under test shall meet the T-coil frequency response per section 8.3.2 of ANSI C63.19-2011 1. 5.4 Signal quality The wireless terminal under test shall meet T-coil signal quality (signal +
35、noise)-to-noise ratio in decibels of 20 dB (corresponding to t3 in ANSI C63.19-2011 1). When the wireless terminal under test meets T-coil signal quality (signal + noise)-to-noise ratio in decibels of 30 dB (corresponding to t4 in ANSI C63.19-2011 1), a symbol (t4) may be put on the terminal and on
36、any associated information about it. This symbol may be complemented by a text such as: “the terminal identified with a “T4“provides an improved signal to noise ratio for the benefits of persons with hearing disabilities“. 6 Measurement procedures 6.1 Introduction The procedures for the measurement
37、of the T-coil signal from the mobile terminal are based upon ANSI C63.19-2011 1. Three quantities of the T-coil signal from the wireless terminal are measured and evaluated: 1) the field intensity of the desired signal at the center of the audio band; 2) the frequency response of the desired signal
38、measured across the audio band; 3) the signal quality, which is defined as the difference between the desired and undesired magnetic field levels, will be referenced by the value (in decibels) of the measured signal to noise ratio. The T-coil mode categorisation from ANSI C63.19-2011 1 per table 8.5
39、 is out of the scope of the present document, but “t3“ and “t4“ defined in clause 5 refer to this table. 6.2 Test facilities, equipment and configurations The test facilities and equipment to be used are specified per section 7.2 “Test facilities and equipment“ of ANSI C63.19-2011 1. The test config
40、urations and setups to be used are specified per section 7.3 of ANSI C63.19-2011 1. The noise level in the test system or from the environment as per section 7.3.1 of ANSI C63.19-2011 1 should not be referred to the category limit as specified in section 8.3 of ANSI C63.19-2011 1. Instead this will
41、be at least 10 dB below the measured signal quality per section 7.4.5 or 7.5.4 of ANSI C63.19-2011 1 or below the device ABM2 level of the device being measured. ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)86.3 Measurement procedures The measurement procedures are fully described per section 7.4. and 7.5
42、 of ANSI C63.19-2011 1, in which: section 7.4 specifies the preferred measurement procedure for T-coil fields; and section 7.5 specifies the alternative measurement procedures using a broadband signal source. For the calculation of signal quality there will be no classification made of T category pe
43、r section 7.4.5 or 7.5.4 of ANSI C63.19-2011 1. Instead the lowest value in decibels of the signal quality measurements will be reported. As a consequence the classification of the signal quality result per section 7.4.1 step g) of ANSI C63.19-2011 1 shall not apply. ETSI ETSI ES 200 381-2 V1.1.1 (2
44、012-10)9Annex A (normative): Excerpts from ANSI C63.19-2011 IEEE C63.19-2011: “American National Standard Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids“, reprinted with permission from IEEE, 3 Park Avenue, New York, NY 10016-5997 USA, and Copyright
45、2011 by IEEE. The relevant pages-A are contained in archive es_20038102v010101p0.zip which accompanies the present document. ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)10Annex B (informative): Bibliography ETSI ETS 300 381: “Telephony for hearing impaired people; Inductive coupling of telephone earphones to hearing aids“. ETSI ETSI ES 200 381-2 V1.1.1 (2012-10)11History Document history V1.1.0 August 2012 Membership Approval Procedure MV 20121005: 2012-08-06 to 2012-10-05 V1.1.1 October 2012 Publication
