The American National Standards Institute (ANSI) has a ratings scale for compatibility between hearing aids and phones:
The American National Standards Institute (ANSI) has a ratings scale for compatibility between hearing aids and phones : · When operating in acoustic ( M icrophone) mode, the ratings are from M1 (worst) to M4 (best). · When operating in electromagnetic ( T elecoil) mode, the ratings are from T1 (worst) to T4 (best). The best possible rating is M4/T4 meaning that the phone works well in both modes. Devices rated below M3 are unsatisfactory for people with hearing aids . Computer programs that allow the creation of a hearing aid using a PC, tablet or smartphone are currently gaining in popularity. [37] Modern mobile devices have all the necessary components to implement this: hardware (an ordinary microphone and headphones may be used) and a high-performance microprocessor that carries digital sound processing according to a given algorithm. Application configuration ...