小波变换在去除瞬态诱发耳声发射中刺激伪迹的应用

耳声发射是目前对外周听觉系统是否完好无损评价的客观指标。在瞬态刺激诱发耳声发射的初始部分通常混杂有刺激伪迹成分（主要指耳道对刺激声直接反射回声），它阻碍了具有短潜伏期的高频蜗响应，这就使得ＯＡＥｓ的测量在临床使用中受到了很多的限制。我们提出了一种基于离散小波变换预处理的去除伪迹方法，该方法不仅能够有效地去除刺激伪迹，而且能够有效的提高耳声发射的信噪比。

Wavelet Application to Reduction of Stimulus Artifact in Transient Evoked Otoacoustic Emissions Testing

Otoacoustic emissions(OAEs) are presently considered as an objective clinical test for assessing the integraity of peripheral hearing. Owing to the adding of the reflex waves of the stimuli, recordings of emissions evoked in response to transient stimuli are contaminated by an initial artifact, which inhibits the examination of high frequency cochlear responses that have short latencies. So OAEs testing is of serious limitation in most clinical environments. We propose an artifact reduction technique based on discrete wavelet transform pre processing method and demonstrate empirically that the method not only improves artifact reduction but also enhances signal to noise ratio in the response region.