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Cell phone and hearing instrument
compatibility
Some hearing instrument users have reported a
buzzing sound in their instruments when they are
using cell phones, indicating that the cell phone
and hearing instrument may not be compatible.
The compatibility of a particular hearing aid and
cell phone can be predicted by adding the rating
for the hearing aid immunity to the rating for the
cell phone emissions (ANSI C63.19-2006 American
National Standard Methods of Measurement of
Compatibility between Wireless Communication
Devices and Hearing Aids).
For example, the sum of a hearing aid with a
rating of 2 (M2/T2) and a telephone with a rating
of 3 (M3/T3) would result in a combined rating of
5. According to the standard, any combined rating
that equals at least 5 would provide "normal use";
a combined rating of 6 or greater would indicate
"excellent performance."
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