Measuring distortion product otoacoustic emissions using continuously sweeping primaries
Measuring distortion product otoacoustic emissions using continuously sweeping primaries
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DOI：
10.1121/1.2949505
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发表时间：
2008-09-01
影响因子：
2.4
通讯作者：
Lee, Jungmee
中科院分区：
文献类型：
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作者：
Long, Glenis R.;Talmadge, Carrick L.;Lee, Jungmee
来自正常听力个体的畸变产物耳声发射（DPOAE）水平可以随着小的频率变化而变化多达30 dB（这种现象被称为DPOAE精细结构）。假设这种精细结构源于来自耳蜗的两个不同区域（非线性发生器区域和来自DP区域的反射分量）的分量的相互作用。一个有效的程序来分离这两个组件将提高DPOAE的临床和研究效用，允许不同的耳蜗区域的单独评价。本文比较了两种评价DPOAE精细结构的方法：固定频率和连续扫频两种方法。扫描DPOAE数据用最小二乘拟合滤波器进行分析。大于8秒每倍频程的扫描速率允许耳蜗精细结构的快速评估。每倍频程2s的较高扫描速率提供了无精细结构的DPOAE。在这些条件下，较长等待时间反射分量福尔斯落在滤波器的范围之外。因此，DPOAE与扫频音获得可以用来获得更快的估计DPOAE精细结构或获得估计DPOAE从发电机区域未被污染的能量从反射区域。(C)2008年，美国声学学会。
Distortion product otoacoustic emission (DPOAE) level from normal hearing individuals can vary by as much as 30 dB with small frequency changes (a phenomenon known as DPOAE fine structure). This fine structure is hypothesized to stem from the interaction of components from two different regions of the cochlea (the nonlinear generator region and the reflection component from the DP region). An efficient procedure to separate these two components would improve the clinical and research utility of DPOAE by permitting separate evaluation of different cochlea regions. In this paper, two procedures for evaluating DPOAE fine structure are compared: DPOAE generated by fixed-frequency primaries versus continuously sweeping primaries. The sweep DPOAE data are analyzed with a least squares, fit filter. Sweep rates of greater than 8 s per octave permit rapid evaluation of the cochlear fine structure. A higher sweep rate of 2 s per octave provided DPOAE without fine structure. Under these conditions, the longer latency reflection component falls outside the range of the filter. Consequently, DPOAE obtained with sweeping tones can be used either to get more rapid estimates of DPOAE fine structure or to obtain estimates of DPOAE from the generator region uncontaminated by energy from the reflection region. (C) 2008 Acoustical Society of America.