【摘要】 瞬态诱发耳声发射是一种时变的声信号 ,用传统的傅立叶变换无法完全表示其信息。本文介绍了用短时傅立叶变换分析瞬态诱发耳声发射方法 ,并给出了其时频分布的实验结果 ,分析了其各个频率成份出现的不同时刻及持续时间。本文还对瞬态诱发耳声发射中的伪迹出现的时间和频率作了分析 ,指出伪迹在时频域是和有用信号分离的 ,理论上可以通过时频滤波器去除更多还原

【Abstract】 TEOAEs are time varying sound signals. Their information could not be described enough by traditional Fourier transform. This paper introduces the method of analyzing TEOAEs by short time Fourier transform and gives the experiment results of time frequency distribution, then we analyze each frequency component. The start time,duration and frequency of stimulus artifact also have been described in this paper. It is been indicated that the stimulus artifact is apart from useful signal in time frequency domain, so it can be filtered by time frequency filter in theory.更多还原