Measuring stimulus-frequency otoacoustic emissions using swept tones
Measuring stimulus-frequency otoacoustic emissions using swept tones
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DOI：
10.1121/1.4807505
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发表时间：
2013-07-01
影响因子：
2.4
通讯作者：
Shera, Christopher A.
中科院分区：
文献类型：
--
作者：
Kalluri, Radha;Shera, Christopher A.
虽然刺激频率耳声发射（SFOAE）提供了令人信服的优势，作为耳蜗功能的无创探头，他们仍然没有得到充分利用相比，其他诱发发射类型，如失真产品（DPOAE），其测量方法不太复杂和耗时。受DPOAE测量的类似进展的启发，本文开发并表征了一种基于扫频音的更有效的SFOAE测量范例。与标准SFOAE测量方法相比，其中使用明确定义频率的离散音调在正弦稳态下测量发射，扫频方法使用线性调频样刺激快速扫过频率（通常以1Hz/ms或更大的速率）。在交错抑制范例中使用扫频和离散音方法获得的测量结果表明，测量SFOAE的两种方法产生几乎相同的结果，它们之间的差异与单独使用任一方法遇到的运行间变异性相当。该匹配对测量参数（例如扫描速率和方向）的变化具有鲁棒性。使用这两种测量方法获得的SFOAE的近似等效性使得能够在现有的理论框架内解释扫频SFOAE。此外，数据表明，SFOAE相位梯度延迟，包括其大的和不规则的波动，在不同的频率，反映实际的物理时间延迟，表明物理发射延迟，而不仅仅是相位梯度，是固有的不规则。(C)2013年美国声学学会。
Although stimulus-frequency otoacoustic emissions (SFOAEs) offer compelling advantages as noninvasive probes of cochlear function, they remain underutilized compared to other evoked emission types, such as distortion-products (DPOAEs), whose measurement methods are less complex and time-consuming. Motivated by similar advances in the measurement of DPOAEs, this paper develops and characterizes a more efficient SFOAE measurement paradigm based on swept tones. In contrast to standard SFOAE measurement methods, in which the emissions are measured in the sinusoidal steady-state using discrete tones of well defined frequency, the swept-tone method sweeps rapidly across frequency (typically at rates of 1 Hz/ms or greater) using a chirp-like stimulus. Measurements obtained using both swept-and discrete-tone methods in an interleaved suppression paradigm demonstrate that the two methods of measuring SFOAEs yield nearly equivalent results, the differences between them being comparable to the run-to-run variability encountered using either method alone. The match appears robust to variations in measurement parameters, such as sweep rate and direction. The near equivalence of the SFOAEs obtained using the two measurement methods enables the interpretation of swept-tone SFOAEs within existing theoretical frameworks. Furthermore, the data demonstrate that SFOAE phase-gradient delays-including their large and irregular fluctuations across frequency-reflect actual physical time delays at different frequencies, showing that the physical emission latency, not merely the phase gradient, is inherently irregular. (C) 2013 Acoustical Society of America.