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About Start-up Handling Options Tinnitus Warnings More info
Mobile phone
Some hearing aid users have reported a
buzzing sound in their hearing aid when they
are using mobile phones, indicating that the
mobile phone and hearing aid may not be
compatible.
The ANSI C63.19 standard determines the
prediction of compatibility between a specic
hearing aid and a mobile phone by: adding the
numerical value of the rating for the hearing
aid immunity to the numerical value of the
rating for the mobile phone emissions. A sum
of 4 would indicate that the combination of
wireless device and hearing aid is usable; a
combined rating that equals at least 5 would
provide normal use; a combined rating of 6 or
greater would indicate excellent performance.
Whereas all hearing aids have acoustic
coupling, only the larger hearing aids have the
physical space for telecoil (inductive) coupling.
These two types of coupling have different
rating scales (M1-M4 for acoustic coupling
and T1-T4 for telecoil coupling, respectively)
and both ratings are therefore relevant when
predicting the compatibility of a particular
hearing aid.
For a hearing aid with both acoustic coupling
and telecoil coupling with a rating of M4/
T2 and with a telephone rating of M3/T3),
the combined rating is 7 (M4 + M3) for the
acoustic coupling and 5 (T2 + T3) for the
telecoil coupling. According to the guidelines
given above, both types of coupling will
thereby be acceptable, with the acoustic
coupling indicating excellent performance and
the telecoil coupling indicating normal use.
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