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About Getting started Daily use Options Warnings More info
Mobile phone
Some hearing aid users have report-
ed a buzzing sound in their hearing
aid when they are using cell phones,
indicating that the cell phone and
hearing aid may not be compatible.
The ANSI C63.19 standard deter-
mines the prediction of compatibility
between a specic hearing aid and a
mobile phone by: adding the numer-
ical value of the rating for the hear-
ing aid immunity to the numerical
value of the rating for the cell phone
emissions. A sum of 4 would indi-
cate that the combination of wireless
device and hearing aid is usable; a
combined rating that equals at least
5 would provide normal use; a com-
bined rating of 6 or greater would
indicate excellent performance.
Whereas all hearing aids have acous-
tic coupling, only the larger hearing
aids have the physical space for
telecoil (inductive) coupling. These
two types of coupling have dierent
rating scales (M1-M4 for acoustic
coupling and T1-T4 for telecoil cou-
pling, respectively) and both ratings
are therefore relevant when predict-
ing 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 guideline
given above, both types of coupling
will thereby be acceptable, with the
acoustic coupling indicating excellent
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