ITU-R M 1076-1-2015 Wireless communication systems for persons with impaired hearing《用于受损听力的人的无线通信系统》.pdf
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1、 Recommendation ITU-R M.1076-1 (02/2015) Wireless communication systems for persons with impaired hearing M Series Mobile, radiodetermination, amateur and related satellite services ii Rec. ITU-R M.1076-1 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, effici
2、ent and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are
3、performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Fo
4、rms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also
5、be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobil
6、e, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum manag
7、ement SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2015 ITU 2015 All rights reserved. No part
8、 of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R M.1076-1 1 RECOMMENDATION ITU-R M.1076-1* Wireless communication systems for persons with impaired hearing (Question ITU-R 254/5) (1994-2015) Scope This Recommendation provides the technica
9、l and operational characteristics for wireless accessibility of hearing aids to public, home and personal audio services operating in the land mobile service. Keywords ALD, ALS, assistive listening device, hearing aid, wireless accessibility of hearing aids Acronyms and abbreviations ALD Assistive l
10、istening device ALS Assistive listening systems DSP Digital signal processing e.r.p. Effective radiated power LAN Local area network The ITU Radiocommunication Assembly, considering a) that many forms of hearing impairment cannot be satisfactorily improved by audio amplification only; b) that a numb
11、er of means have been used to transfer speech signals to the listeners hearing device. These means include infrared radiation, use of the magnetic induction internal to current loops, including operation at audio frequencies, VHF and UHF radio and the external induction field of a radiating antenna;
12、 c) that some 10% of people suffer from mild to severe hearing loss; d) that users of aids for hearing impaired (hearing aids including assistive listening devices) are found worldwide; e) that personal uses include access to mobile phone and personal audio applications; f) that home usage includes
13、access to broadcast television, broadcast radio, emergency notification and alarms; g) that public usage includes access to points of sales, counters, public address systems in areas such as airports, train stations, religious places, theatres, events and cinemas; h) that the practical application o
14、f infrared systems and audio frequency induction loops to communicate with persons with impaired hearing should also be considered for some applications, * The Director, Radiocommunication Bureau, is requested to bring this Recommendation to the attention of the ITU-T Study Group JCA-AHF and the Int
15、ernational Electrotechnical Commission (IEC). 2 Rec. ITU-R M.1076-1 recognizing a) that Resolution 175 (Rev. Busan, 2014) of the Plenipotentiary Conference resolves to take account of persons with disabilities in the work of ITU, noting a) that for public use it may be beneficial to have a standardi
16、zed wireless system, operating on globally harmonized tuning range; b) that there is a wide divergence in spectrum used around the world for assistive listening devices; c) that administrations need to carefully consider suitable harmonized frequency ranges for the operation of wireless systems for
17、hearing impaired person, recommends that the technical and operational characteristics for radiocommunication systems for persons with impaired hearing given in Annexes 1 and 2 should be used. Annex 1 Operational characteristics of wireless communication systems for persons with impaired hearing 1 S
18、ystem concepts Historically, hearing aids consisted of little more than basic “miniature audio amplifiers” placed in or behind the ear(s) solely boosting the incoming sounds. As semiconductor technology has evolved and become miniaturised, hearing impaired people enjoy extremely sophisticated digita
19、l systems incorporating a range of communication capabilities. State-of-the-art technology uses specialized digital signal processing (DSP) technology that is advanced enough to fulfil the stringent mechanical (ultra miniature) and power consumption (only one small single cell battery) requirements
20、that are specified for modern hearing aid devices. DSPs manipulate the incoming sound spectrum mathematically, converting it into a digital representation; programmable software then manipulates this digital representation to achieve: background noise reduction; correction of user specific deficienc
21、ies; enhancement of sound cues and other listening parameters used by the brain to reconstruct normal hearing. Hearing aids contribute to user safety, comfort and enjoyable listening experience. However, real life offers an incredible richness in different listening environments in some of which eve
22、n the most sophisticated hearing instruments show only a limited benefit. Examples of acoustic environments or listening situations where the performance of conventional hearing instruments can substantially be improved by applying additional communication devices are the following: reverberant envi
23、ronments such as big churches or lecture halls; communication over larger distances, e.g. in a lecture or in a classroom; Rec. ITU-R M.1076-1 3 communication on the telephone, especially cell phones. situations with large background noise levels (e.g. rooms, halls and areas with multi-talker speech;
24、 engine noise inside or outside of trains and busses, etc.). In these environments the application of assistive listening systems (ALS) based on wireless communication technologies offer substantial additional benefits and significantly improve speech intelligibility. The advent of digital broadcast
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