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畸变产物耳声发射(DPOAE)信号可以用于听力损失的诊断,具有重要的临床应用价值。但是,大频率范围内进行DPOAE测量时,需要耗费大量的时间。采用扫频信号作为诱发信号,为记录大频率范围内的DPOAE测量数据提供了一种快速而有效的手段。本文在已有的最小二乘拟合(LSF)算法的基础上,给出一种估计扫频激励下的DPOAE信号的局部加权最小二乘估计(LWLSE)算法,从扫频激励下的DPOAE记录信号中提取方差根音2f1-f2频率处的DPOAE信号。仿真结果表明,该方法相对于常用的LSF方法,对DPOAE信号和初始刺激信号的估计更准确,并且估计结果具有更小的估计方差,有利于提取更加准确的DPOAE精细结构。
Distortion product otoacoustic emissions (DPOAE) signal can be used for the diagnosis of hearing loss, which has important clinical value. However, DPOAE measurements in a large frequency range take a great deal of time. Using the sweep signal as a trigger signal provides a quick and efficient means of recording DPOAE measurements over a large frequency range. Based on the existing Least Squares Fit (LSF) algorithm, this paper presents a local weighted least square estimation (LWLSE) algorithm for estimating DPOAE signals under sweeping excitation. From the DPOAE recording The DPOAE signal at variance 2f1-f2 is extracted from the signal. The simulation results show that the proposed method is more accurate than the commonly used LSF method in estimating DPOAE signals and initial stimulus signals, and the estimation results have a smaller estimated variance, which facilitates the extraction of more accurate DPOAE fine structures.