
Hearing aids. Part 4: Magnetic field strength in audio-frequency induction loops for hearing aid purposes
出版:International Electrotechnical Committee

专家解读视频
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.