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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 is synonymous for T ratings. 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 is 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.
For information about hearing aids and digital
wireless phones
FCC Hearing Aid Compatibility and Volume
Control
http://www.fcc.gov/cgb/dro/hearing.html
Gallaudet University, RERC
http://tap.Gallaudet.edu/DigWireless.KS/DigWirele
ss.htm
Hearing Loss Association of America [HLAA]
http://www.hearingloss.org/learn/cellphonetech.asp
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatch
/FCC-03-168A1.pdf
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