Pasanen E G, Travis J D, Thornhill R J
Department of Psychology, University of Texas, Austin 78712.
Biomed Sci Instrum. 1994;30:75-80.
A transient-evoked otoacoustic emission (TEOAE) is a sound originating in the cochlea in response to a brief acoustic stimulus, such as a click. The response is typically a weak (25 dB SPL maximum) signal that lasts 20-40 ms. Analysis of TEOAEs is promising as a noninvasive technique for understanding cochlear function and as a diagnostic tool in identifying hearing loss. A TEOAE database was collected on many subjects, some of which were administered quinine to study the effect of the drug on TEOAE. Historically, FFT techniques have not worked well on TEOAE data because of the nonstationary nature of the signals. We have used a wavelet-like approach in analyzing the data by employing a set of equal-bandwidth filters, which have revealed the emission energy to be concentrated in the 800-2000 Hz range. This type of analysis is shown to be useful in examining the time progression of different frequency bands of the click-evoked emissions in subjects who took quinine.
瞬态诱发耳声发射（TEOAE）是一种起源于耳蜗的声音，它是对短暂声学刺激（如咔嗒声）的响应。该响应通常是一个微弱的（最大声压级为25dB SPL）信号，持续20 - 40毫秒。TEOAE分析作为一种理解耳蜗功能的非侵入性技术以及识别听力损失的诊断工具很有前景。收集了许多受试者的TEOAE数据库，其中一些受试者服用了奎宁以研究该药物对TEOAE的影响。从历史上看，由于信号的非平稳特性，快速傅里叶变换（FFT）技术在TEOAE数据上效果不佳。我们通过使用一组等带宽滤波器，采用类似小波的方法来分析数据，这些滤波器显示发射能量集中在800 - 2000赫兹范围内。这种类型的分析在检查服用奎宁的受试者中咔嗒诱发发射不同频段的时间进展方面很有用。
