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Development of the hearing aid measurement system

The characteristics of hearing aids should be determined and regulated to ensure patient safety and to optimize the performance of the hearing aids. The objectives of this work were to design and develop a hearing aid measurement system to obtain the performance characteristics of the hearing aids. The implementation of this work is based on the method recommended in the International Electrotechnical Commission (IEC 60118-7). To verify the performance of the developed hearing aid measurement system, the hearing aid characteristics measured from our developed measurement system (such as Maximum OSPL90, Frequency of Maximum OSPL90, HFA-OSPL90, Maximum Full-on Gain, Frequency of FOG Maximum, HFA-FOG, Lowest Frequency, Highest Frequency, RTG @ RTS/60 dB, THD 500 Hz, THD 800 Hz and THD 1600 Hz) were compared with those measured from the commercial hearing aid analyzer and those provided from the hearing aid manufacturer's specifications. The results show that the hearing aid characteristics measured from our developed measurement system were in good agreement with those measured from the commercial hearing aid analyzer and those provided by the hearing aid manufacturer's specifications.