BS EN 60118-4-2006 电声学.助听器.第4部分:助听器用感应回路系统.磁场强度

标准号：BS EN 60118-4-2006
中文标准名称：电声学.助听器.第4部分:助听器用感应回路系统.磁场强度
英文标准名称：Electroacoustics - Hearing aids - Part 4: Induction loop systems for hearing aid purposes - Magnetic field strength
标准类型：L31
发布日期：2007/1/31 12:00:00
实施日期：2007/1/31 12:00:00
中国标准分类号：L31
国际标准分类号：11.180.15
适用范围：This international standard is applicable to audio-frequency induction loop systems producing an alternating magnetic field at audio frequencies and intended to provide an input signal for hearing aids operating with an induction pick-up coil.The standard specifies requirements for the field strength in audio-frequency induction loops for hearing aid purposes, which will give adequate signal-to-noise ratio without overloading the hearing aid. The standard also specifies the minimum frequency response requirements for acceptable intelligibility.Methods for measuring the magnetic field strength are specified, and information is given on appropriate measuring equipment (see Annex B), information that should be provided to the operator and users of the system (see Annex C), and other important considerations.The standard does not specify requirements for loop driver amplifiers or associated microphone or audio signal sources, or for the field strength produced by equipment, such as telephone handsets, within the scope of ITU-T P.370.