Agency for Defense Development, Room 1009, 102 dong, Woo bang APT., Wall sung dong, dal sur gu, Dae gu 704-400, South Korea.
Biomed Microdevices. 2013 Oct;15(5):867-77. doi: 10.1007/s10544-013-9774-8.
With the advent of implantable hearing aids, implementation and acoustic sensing strategy of the implantable microphone becomes an important issue; among the many types of implantable microphone, placing the microphone in middle ear cavity (MEC) has advantages including simple operation and insensitive to skin touching or chewing motion. In this paper, an implantable microphone was implemented and researched feedback characteristic when both the implantable microphone and the transducer were placed in the MEC. Analytical and finite element analysis were conducted to design the microphone to have a natural frequency of 7 kHz and showed good characteristics of SNR and sensitivity. For the feedback test, simple analytical and finite element analysis were calculated and compared with in vitro experiments (n = 4). From the experiments, the open-loop gain and feedback factor were measured and the minimum gain margin measured as 14.3 dB.
随着可植入助听器的出现，可植入麦克风的实现和声学感应策略成为一个重要问题；在许多类型的可植入麦克风中，将麦克风放置在中耳腔（MEC）中具有操作简单和对皮肤触摸或咀嚼运动不敏感等优点。本文实现了一种可植入麦克风，并研究了当可植入麦克风和换能器都放置在 MEC 中时的反馈特性。通过分析和有限元分析来设计麦克风，使其自然频率为 7 kHz，并具有良好的 SNR 和灵敏度特性。对于反馈测试，进行了简单的分析和有限元分析，并与体外实验（n=4）进行了比较。从实验中，测量了开环增益和反馈因子，并测量了最小增益裕度为 14.3 dB。
