BS EN IEC 60118-4:2015+A1:2018 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 (telecoil). Throughout this standard, it is assumed that the hearing aids used with it conform to all relevant parts of IEC 60118.

This 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.

This standard does not specify requirements for loop driver amplifiers or associated microphone or audio signal sources, which are dealt with in IEC 62489-1, or for the field strength produced by equipment, such as telephone handsets, within the scope of ITU-T P.370.


Cross References:
EN 60268-3:2013
IEC 60268-10:1991
HD 483.10 S1:1993
IEC 62489-1:2010
EN 61672-1:2013
IEC 60268-3:2013
IEC 61672-1:2013
EN 62489-1:2010
IEC 61938
IEC 61260-1
ETSI TR 101 767
ITU-T Recommendation P.50
ITU-T Recommendation P370
BS 7594:2010
EN 61938
IEC 60268-1
EN 61260-1


Incorporates the following:
Amendment, April 2018