本論文主要是發展一個以軟體為基準的助聽器模擬平台，提供給臨床人員或醫生一個輔助工具，對於聽力損傷的病患在配戴助聽器之前，可以先透過我們發展的平台，不需經過實體助聽器的試用就可立即體驗助聽器的功能，幫助他們找到適合自己的助聽器。助聽器模擬平台主要包含回饋音消除(feedback cancellation)、噪音消除(noise reduction)與放大器。而本研究的主軸在回饋音消除的部份。在放大器部分我們目前採用線性放大來近似模擬回饋音的產生。本論文透過專利文獻來近似模擬GN Resound Canta、Oticon Syncro、Sonic Natura這三家著名的助聽器公司演算法，他們的方法都是基於適應性濾波器(adaptive filter)的原理發展出來的，本研究顯示適應性濾波器的收斂係數會影響估測誤差，模擬結果也顯示我們均能有效近似模擬各廠牌的回饋音消除演算法並消除回饋音的能量，且不論是回饋音路徑的改變或是在噪音的環境下，仍然可以維持不錯的回饋音消除的性能。 The main purpose of this study is to develop a software-based simulation platform of hearing aid. To offer an assistive tool for clinician. For people with hearing loss before fit hearing aid, they can use our platform, don’t need to test by hearing aid that can experience function of hearing aid. To help them to find a hearing aid that fit them. Simulation platform of hearing aid includes feedback cancellation, noise reduction and amplifier. The main part of our research focuses on feedback cancellation. We adopted linear amplification to simulate feedback in the amplifier. In this paper we simulate algorithms for GN Resound Canta,Oticon Syncro, and Sonic Natura of Hearing Aid Company by patents. Their means were developed based on adaptive filter’s theory. We show the step size of adaptive filter will affect the estimate error. Simulation results show we can simulate algorithms of Hearing Aid Company efficiently and cancel energy of feedback. And it still remains the good performance of feedback cancellation under variation of feedback path or in the noise environment.
