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rating. Higher ratings mean that the hearing
device is relatively immune to interference
noise. The hearing aid and wireless phone
rating values are then added together. A sum
of 5 is considered acceptable for normal
use. A sum of 6 is considered for best use.
In the above example, if a hearing aid meets
the M2 level rating and the wireless phone
meets the M3 level rating, the sum of the
two values equal M5. This should provide the
hearing aid user with "normal usage" while
using their hearing aid with the particular
wireless phone. "Normal usage" in this
context is defined as a signal quality that's
acceptable for normal operation.
The M mark is intended to be synonymous
with the U mark. The T mark is intended
to be synonymous with the UT mark. The
M and T marks are recommended by the
Alliance for Telecommunications Industries
Solutions (ATIS). The U and UT marks are
referenced in Section 20.19 of the FCC
Rules. The HAC rating and measurement
procedure are described in the American
National Standards Institute (ANSI) C63.19
standard.
To ensure that the Hearing Aid Compatibility
rating for your phone is maintained,
secondary transmitters such as Bluetooth
components must be disabled during a call.
For information about hearing aids and
digital wireless phones
Wireless Phones and Hearing Aid
Accessibility
http://www.accesswireless.org/
Gallaudet University, RERC
http://tap.gallaudet.edu/Voice/
FCC Hearing Aid Compatibility and Volume
Control
http://www.fcc.gov/cgb/dro/hearing.html
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/
attachmatch/FCC-03-168A1.pdf
Hearing Loss Association of America [HLAA]
http://hearingloss.org/content/telephones-
and-mobile-devices
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