ITU-T P.370-1996
供电话机使用的耦合助听器
Coupling Hearing Aids to Telephone Sets Study Group 12; 23 pp [Superseded: ITU-T P.37 ITU-T P.37]
- 标准号
- ITU-T P.370-1996
- 发布
- 1996年
- 发布单位
- 国际电信联盟
- 引用标准
- CCITT P.48-1988 IEC 118-1-1995 IEC 118-4-1981 IEC 118-6-1984 IEC 130-8-1976 IEC 268-11-1987 ITU-T G.121-1993 ITU-T P.10-1993 ITU-T P.340-1996 ITU-T P.57-1993
- 适用范围
- Clause 4 applies to telephone handsets having supra-aural earphones that can be connected to the Public Switched Telephone Network (PSTN) or the Integrated Services Digital Network (ISDN) which are intended for direct application to the ear (e.g. traditional handsets, operators’ headsets) and which provide a magnetic field for coupling to hearing aids. It specifies the level, linearity and frequency dependence of the magnetic field strength produced by the handset and characteristics for the calibrated probe coil. Clause 5 specifies the electro-acoustic performance Characteristics of telephony terminals which are intended for direct application to the ear (e.g. traditional handsets, operators’ headsets) and which provide, at the earphone, additional amplification in the receiving direction compared with the Receiving Loudness Rating (RLR) specified in the requirements of the national system. Clause 6 specifies the electrical characteristics for the electrical coupling of the telephony function, implemented telecommunication terminal equipment, to hearing aids. It specifies the level and fì-equency response relative to the acoustic output at the earphone, also the noise and maximum level. Annex A specifies the measuring method for an acousto-magnetic adapter that converts the acoustic output of an associated telephone receiver to a magnetic field, in accordance with 4.2.1 and 4.2.2, that can be received by the magnetic pick-up coil in a hearing aid.