19
using tHe telepHone
Some hearing aid users have reported a buzzing
sound in their hearing aids when they are using cell
phones, indicating that the cell phone and hearing
aid may not be compatible. According to the ANSI
C63.19 standard (ANSI C63.19-2006 American
National Standard Methods of Measurement of
Compatibility Between Wireless Communications
Devices and Hearing Aids), 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.
For example, the sum of a hearing aid rating of 2
(M2/T2) and a telephone rating of 3 (M3/T3) would
result in a combined rating of 5. Any combined rating
that equals at least 5 would provide “normal use”;
a combined rating of 6 or greater would indicate
“excellent performance.”
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.
