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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 specific 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.
The above equipment performance
measurements, categories and system
classifications are based upon the best
information available, but it cannot
be guaranteed that all users will be
satisfied.
The immunity of BTE SP and BTE UP 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 individual hearing aids may vary with individual mobile
phones. Therefore, please 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 mobile phone provider
for the booklet entitled “Hearing Aid Compatibility with Digital Wireless Cell
Phones.”
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