Investigation of DPOAE components in time and frequency

描述(申请人提供)：耳声发射(OAE)是在耳蜗处产生的信号，可能是负责耳朵正常功能的活跃生理过程的副产品。失真产物耳声发射(DPOAEs)是通过用两个纯音同时刺激耳蜗来记录的。Talmadge等人(1998)提出了一种模型，其中记录在耳道中的DPOAE被表示为由几个分量的贡献组成的复合信号。最近的研究集中于对该模型中确定的个别DPOAE组分的特定性质的检查。本研究的目的是研究输入水平对DPOAE主要成分的影响，以及当刺激水平不同时，耳蜗内是否存在多次内反射。此外，在这些实验期间获得的数据将允许估计几个模型参数。总体而言，这些研究结果将有助于我们更好地理解DPOAE的发生机制和耳蜗的基本机制。这些知识将一如既往地提高我们将DPOAE用作临床和研究工具的能力。

DESCRIPTION (provided by applicant): Otoacoustic emissions (OAEs) are signals generated in the cochlea, presumably as a byproduct of active physiological processes responsible for normal functioning of the ear. Distortion product OAEs (DPOAEs) are recorded by stimulating the cochlea simultaneously with two pure tones. A model in which DPOAEs recorded in the ear canal are represented as a composite signal comprised of contributions from several components has been proposed by Talmadge et al., (1998). Research recently has focused on the examination of specific properties of individual DPOAE components identified in this model. The goals of this study are to investigate the effect of input level on the main DPOAE components, and to examine the existence of multiple internal reflections in the cochlea as stimulus level is varied. Additionally, the data obtained during these experiments will allow the estimation of several model parameters. Overall, the results of these studies will improve our understanding of the DPOAE generative mechanisms and the basic mechanics of the cochlea. Such knowledge will invariably improve our ability to use DPOAEs as both a clinical and a research tool.