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자료유형
학술저널
저자정보
한우재 (한림대학교) 김누리 (DigiPen Institute of Technology Singapore)
저널정보
대한청각학회 Journal of Audiology & Otology Journal of Audiology & Otology Vol.22 No.3
발행연도
2018.1
수록면
111 - 119 (9page)

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The hearing-aid transducer is ubiquitous in the hearing-aid industry. For example, the balancedarmature receiver (BAR), first invented by A.G. Bell, has been used in all telephone earphonesbecause it has the highest output and best frequency response. Nevertheless, previouselectro-mechanical studies on these miniature speakers are quite primitive, given theprice of the transducers. Thus, more detailed analysis is critically important for the field ofhearing science. This review study was motivated by Hunt’s parameter calibration (1954), awidely used commercial hearing-aid receiver (ED series, manufactured by Knowles Electronics,Inc.). In the body of the study, the transfer function of the BAR system (i.e., pressure overvoltage) was calculated from Hunt’s parameters, solely from the electrical terminals of the device. The computed transfer function was then further investigated by comparing to thepole-zero fitting method using the methods of Gustavsen and Semlyen (1999) and Prony(1975). Based on our short experiment, the better fitting result was achieved with Gustavsenand Semlyen’s method. By decomposing results of the transfer function fitting into all-passand minimum-phase parts, the system was confirmed as a delay system. We conclude thatthe BAR system is linear, time-invariant, stable, and causal while providing an evidencebasedunderstanding of the hearing-aid receiver system.

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