The effect of stimulus-frequency ratio on distortion product otoacoustic emission components
The effect of stimulus-frequency ratio on distortion product otoacoustic emission components
复制标题
DOI：
10.1121/1.1903846
复制
发表时间：
2005-06-01
影响因子：
2.4
通讯作者：
Tubis, A
中科院分区：
文献类型：
--
作者：
Dhar, S;Long, GR;Tubis, A
通过对失真产物耳声发射（DPOAE）精细结构的详细测量，提取了对耳道中DPOAE总体水平有贡献的两个主要成分的估计。在400 Hz范围内，采用固定比范式记录了3只正常听力耳朵在12种不同刺激频率比（1.053 ~ 1.36）和45 ~ 75 dB声压级（SPL）刺激下的DPOAE精细结构。对振幅和相位数据进行傅里叶反变换滤波，提取最大刺激重叠产生区域的早期分量和DPOAE特征频率区域反射的后期分量。滤波后的数据返回频域，评估刺激频比和刺激水平对各分量相对水平的影响。虽然来自不同耳朵的数据之间存在显著差异，但可以发现一些一致的模式。来自刺激音调重叠区域的分量呈现带通形状，最大发生环的比率为1.2。来自DPOAE特征频率区域的平均数据也表现出带通形状，但没有那么尖锐地调谐，并且在耳朵和刺激水平上表现出更大的变化。DPOAE特征频率区域的分量在比小于1.1时占主导地位（耳间的过渡变化）。这两个成分的相对水平在比值大于1.3时变化很大，并且高度依赖于刺激水平。在测试的最低刺激水平（45/45 dB SPL）下，反射分量在所有比率下都更大。我们讨论了影响dpoae成分行为的因素，以及一些用于临床方案的刺激参数选择的粗略含义。(c) 2005年美国声学学会。
A detailed measurement of distortion product otoacoustic emission (DPOAE) fine structure was used to extract estimates of the two major components believed to contribute to the overall DPOAE level in the ear canal. A fixed-ratio paradigm was used to record DPOAE fine structure from three normal-hearing ears over a range of 400 Hz for 12 different stimulus-frequency ratios between 1.053 and 1.36 and stimulus levels between 45 and 75 dB SPL. Inverse Fourier transforms of the amplitude and phase data were filtered to extract the early component from the generator region of maximum stimulus overlap and the later component reflected from the characteristic frequency region of the DPOAE. After filtering, the data were returned to the frequency domain to evaluate the impact of the stimulus-frequency ratio and stimulus level on the relative levels of the components. Although there were significant differences between data from different ears some consistent patterns could be detected. The component from the overlap region of the stimulus tones exhibits a bandpass shape, with the maximum occur-ring at a ratio of 1.2. The mean data from the DPOAE characteristic frequency region also exhibits a bandpass shape but is less sharply tuned and exhibits greater variety across ears and stimulus levels. The component from the DPOAE characteristic frequency region is dominant at ratios narrower than approximately 1.1 (the transition varies between ears). The relative levels of the two components are highly variable at ratios greater than 1.3 and highly dependent on the stimulus level. The reflection component is larger at all ratios at the lowest stimulus level tested (45/45 dB SPL). We discuss the factors shaping DPOAE-component behavior and some cursory implications for the choice of stimulus parameters to be used in clinical protocols. (c) 2005 Acoustical Society of America.