新生儿瞬态诱发耳声发射的最佳带通滤波。

P Ravazzani, G Tognola, F Grandori
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引用次数: 14

摘要

本文研究了一种最优带通滤波技术的性能,以有效识别新生儿的点击引起的耳声发射。通过最大化两个重复记录之间的相关系数(再现性)来优化滤波器的频率响应。通过控制滤波后的最大能量损失来设定最佳截止频率,以阻止关键响应内容随噪声一起被滤波。作为额外的约束,截止频率被迫在1.6至4.2 kHz的范围之外,以避免(在响应识别任务中)由极化截止频率产生的自发耳声发射,从而过滤基频分量,从而导致错误的响应分类。在提高过滤后的再现性方面,最佳过滤器的最佳性能是在将该程序应用于过滤前再现性范围在60%至80%之间的记录时获得的,即在大多数情况下归类为部分通过的响应。
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Optimal band pass filtering of transient evoked otoacoustic emissions in neonates.

This paper investigated the performance of an optimal bandpass filtering technique to effectively identify click evoked otoacoustic emissions in neonates. The frequency response of the filter was optimized by maximizing the correlation coefficient between two replicate recordings (reproducibility). The optimal cut-off frequencies were also set by controlling the maximum energy loss after filtering to stop the crucial response contents being filtered along with the noise. As an additional constraint, the cut-off frequencies were forced to be outside the range of 1.6 to 4.2 kHz to avoid (in a response identification task) the spontaneous otoacoustic emissions from polarizing the cut-offs and thereby filtering fundamental frequency components, thus leading to an erroneous response classification. The best performance of the optimal filter in terms of increasing the post-filtering reproducibility was obtained when the procedure was applied to recordings whose reproducibility before filtering ranged between 60 and 80 per cent, i.e. for responses classified in most cases as partial pass.

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