IEC 60118-4 Ed. 1.0被替代
Hearing aids. Part 4: Magnetic field strength in audio-frequency induction loops for hearing aid purposes
出版：International Electrotechnical Committee
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基本信息
標準編號： IEC 60118-4 Ed. 1.0
發布時間：1981/1/1 0:00:00
標準類別：Standard
出版單位：International Electrotechnical Committee
標準頁數：9
標準簡介
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.
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