ETSI - ES 200 381-1
Telephony for hearing impaired people; Inductive coupling of telephone earphones to hearing aids; Part 1: Fixed-line speech terminals
|Publication Date:||1 August 2012|
The present document applies to fixed telephones having earphones (see ITU-T Recommendation P.57 ) which are intended for direct application to the ear (e.g. handsets, supra-aural headsets) and which are intended to provide, through the earphone, a magnetic field for coupling to hearing aids.
It specifies the level linearity and frequency dependence of the magnetic field strength produced by the handset and characteristics for the calibrated probe coil. It also specifies provisions for distortion, noise and signal to noise ratio of the magnetic field.
Provisions for DECT terminals, are within the scope of this part 1 of this multipart delivrable, even if it is a cordless technology.
Handsfree or loudspeaking devices are outside the scope of the present document.
The requirements for inductive coupling with wireless terminal earphones are outside the scope of the present document.