Ozdamar O, Delgado R E, Rahman S, Lopez C
University of Miami, Department of Biomedical Engineering, Coral Gables, FL 33124, USA.
Ann Biomed Eng. 1998 Sep-Oct;26(5):883-91. doi: 10.1114/1.111.
An innovative acoustic noise canceling method using adaptive Wiener filtering (AWF) was developed for improved acquisition of distortion product otoacoustic emissions (DPOAEs). The system used one microphone placed in the test ear for the primary signal. Noise reference signals were obtained from three different sources: (a) pre-stimulus response from the test ear microphone, (b) post-stimulus response from a microphone placed near the head of the subject and (c) post-stimulus response obtained from a microphone placed in the subject's nontest ear. In order to improve spectral estimation, block averaging of a different number of single sweep responses was used. DPOAE data were obtained from 11 ears of healthy newborns in a well-baby nursery of a hospital under typical noise conditions. Simultaneously obtained recordings from all three microphones were digitized, stored and processed off-line to evaluate the effects of AWF with respect to DPOAE detection and signal-to-noise ratio (SNR) improvement. Results show that compared to standard DPOAE processing, AWF improved signal detection and improved SNR.
为了更好地采集畸变产物耳声发射（DPOAE），开发了一种使用自适应维纳滤波（AWF）的创新型声学噪声消除方法。该系统使用一个放置在测试耳中的麦克风来获取主信号。噪声参考信号从三个不同来源获得：（a）测试耳麦克风的刺激前响应，（b）放置在受试者头部附近的麦克风的刺激后响应，以及（c）放置在受试者非测试耳中的麦克风的刺激后响应。为了改善频谱估计，使用了不同数量的单次扫描响应的块平均法。在一家医院的健康新生儿护理室的典型噪声条件下，从11名健康新生儿的耳朵中获取了DPOAE数据。同时对来自所有三个麦克风的记录进行数字化、存储并离线处理，以评估AWF对DPOAE检测和信噪比（SNR）改善的影响。结果表明，与标准DPOAE处理相比，AWF改善了信号检测并提高了SNR。
