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Mobile phone
Some hearing aid users have reported 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 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
cell phone emissions. A sum of 4 would
indicate that the combination of wireless
device and hearing aid is usable; a com-
bined 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 guideline given above,
both types of coupling will thereby be
acceptable, with the acoustic coupling
indicating excellent performance and the
telecoil coupling indicating normal use.
The above equipment performance
measurements, categories and system
classications are based upon the best
information available, but it cannot be
guaranteed that all users will be satised.
The immunity of this hearing aid is at
least M2/T2. The equipment performance
measurements, categories and system
classifications are based upon the
best information available but cannot
guarantee that all users will be satisfied.
IMPORTANT NOTICE
The performance of an individual hearing aid may vary with individual cell
phones. Therefore, ensure you try this hearing aid with your mobile phone
or, if you are purchasing a new phone, be sure to try it with your hearing
aid prior to purchase. For additional guidance, please ask your cell phone
provider for the booklet entitled “Hearing Aid Compatibility with Digital
Wireless Cell Phones”.
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