Samsung Galaxy Stellar ユーザーズマニュアル

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be able to use a rated mobile device successfully. Trying out 
the mobile device with your hearing device is the best way to 
evaluate it for your personal needs.
M-Ratings: Wireless mobile devices rated M3 or M4 meet 
FCC requirements and are likely to generate less interference 
to hearing devices than mobile devices that are not labeled. 
M4 is the better/higher of the two ratings.  M-ratings refer to 
enabling acoustic coupling with hearing aids that do not 
operate in telecoil mode.
T-Ratings: Mobile devices rated T3 or T4 meet FCC 
requirements and are likely to generate less interference to 
hearing devices than mobile devices that are not labeled. T4 
is the better/higher of the two ratings. T-ratings refer to 
enabling inductive coupling with hearing aids operating in 
telecoil mode.
Hearing devices may also be rated. Your hearing aid 
manufacturer or hearing health professional may help you 
find this rating. Higher ratings mean that the hearing device 
is relatively immune to interference noise. 
Under the current industry standard, American National 
Standards Institute (ANSI) C63.19, the hearing aid and 
wireless mobile device rating values are added together to 
indicate how usable they are together. For example, if a 
hearing aid meets the M2 level rating and the wireless 
mobile device meets the M3 level rating, the sum of the two 
values equals M5. 
Under the standard, this should provide the hearing aid user 
with normal use while using the hearing aid with the 
particular wireless mobile device. A sum of 6 or more would 
indicate excellent performance.  
However, these are not guarantees that all users will be 
satisfied. T ratings work similarly.
 
M3                 +                    M2         =     5
T3                 +                    T2         =     5