自适应信号增强在瞬态诱发耳声发射信号检测中的应用  

Detection of transient evoked otoacoustic emissions by adaptive signal enhancement

作　　者：叶万兴[1] 叶大田[1] 曹宇[1] 

机构地区：[1]清华大学电机系生物医学工程研究所,北京100084

出　　处：《声学学报》2003年第3期248-254,共7页Acta Acustica

基　　金：国家自然科学基金资助项目(39870212)

摘　　要：耳声发射是近年来耳科学领域的研究热点。它已成为临床听力筛选和诊断耳蜗病变最为有效的手段之一。耳声发射信号的信噪比和相关率是临床诊断的重要依据。文中将自适应信号增强技术引入到对瞬态诱发耳声发射信号的检测中,并提出了一个基于最小均方算法的实用的自适应信号增强器结构。通过对106例受试耳所进行的瞬态诱发耳声发射信号检测,结果表明,自适应信号增强技术与传统的相干平均技术相比有更好的增强信号和抑制噪声的性能。利用自适应信号增强可以提高瞬态诱发耳声发射信号的信噪比增速、减少检测所需叠加次数、检测用时可缩短近一半。Otoacoustic emissions (OAEs) has been considered as an excellent objective tool in clinics for diagnosing hearing loss. The signal-to-noise ratio (SNR) and correlation coefficient of OAEs are very important for the purpose of diagnosis. An adaptive signal enhancer (ASE) based on the Least Mean Square (LMS) algorithm is presented to detect transient evoked OAEs (TEOAEs). The TEOAEs detection results from 106 ears show that ASE reaches better estimation of TEOAEs than a conventional ensemble averaging (EA) technique. With the ASE, the improvement of SNR was increased faster than that with the EA and the number of sweeps required can be markedly reduced. The detection time with ASE could be shortened by about 50% in comparison with that of EA.

关 键 词：自适应信号增强 耳声发射 耳科学 听力 耳蜗病变 临床诊断 信噪比 相关率 瞬态诱发 信号检测 

分 类 号：TN912.3[电子电信—通信与信息系统]