标准摘要
[中文适用范围]： 适用于为这些设备提供输入信号的系统。指定磁场强度的标准值，并在不使设备过载的情况下提供足够的信噪比。推荐值也可能适用于 [外文原描述]： Applies to audio-frequency induction loop systems producing an alternating magnetic field and intended to provide an input signal for hearing aids operating with an induction pick-up coil. Specifies a standard value of magnetic field strength in audio-frequency induction loops for hearing aid purposes, such as will give an adequate signal-to-noise ratio without overloading the hearing aid.
英文名称Methods of measurement of electro-acoustical characteristis of hearing aids. Part 4: Magnetic field strength in audio-frequency induction loops for hearing aid purposes