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Denoising click-evoked otoacoustic emission signals by optimal shrinkage
The Journal of the Acoustical Society of America ( IF 2.4 ) Pub Date : 2021-04-15 , DOI: 10.1121/10.0004264
Tzu-Chi Liu, Yi-Wen Liu, Hau-Tieng Wu

Click-evoked otoacoustic emissions (CEOAEs) are clinically used as an objective way to infer whether cochlear functions are normal. However, because the sound pressure level of CEOAEs is typically much lower than the background noise, it usually takes hundreds, if not thousands, of repetitions to estimate the signal with sufficient accuracy. In this paper, we propose to improve the signal-to-noise ratio (SNR) of CEOAE signals within limited measurement time by optimal shrinkage (OS) in two different settings: covariance-based optimal shrinkage (cOS) and singular value decomposition-based optimal shrinkage (sOS). By simulation, the cOS consistently enhanced the SNR by 1–2 dB from a baseline method that is based on calculating the median. In real data, however, the cOS cannot enhance the SNR over 1 dB. The sOS achieved a SNR enhancement of 2–3 dB in simulation and demonstrated capability to enhance the SNR in real recordings. In addition, the level of enhancement increases as the baseline SNR decreases. An appealing property of OS is that it produces an estimate of all single trials. This property makes it possible to investigate CEOAE dynamics across a longer period of time when the cochlear conditions are not strictly stationary.

中文翻译:

通过最佳收缩对点击诱发的耳声发射信号进行去噪

诱发听觉的耳声发射(CEOAEs)在临床上被用作客观的方法来推断耳蜗功能是否正常。但是,由于CEOAE的声压级通常远低于背景噪声,因此通常需要数百次(甚至数千次)重复才能以足够的精度估算信号。在本文中,我们建议通过最佳收缩率在有限的测量时间内提高CEOAE信号的信噪比(SNR)(OS)有两种不同的设置:基于协方差的最佳收缩率(cOS)和基于奇异值分解的最佳收缩率(sOS)。通过仿真,与基于中值计算的基准方法相比,cOS始终将SNR提高了1-2 dB。但是,在实际数据中,cOS无法将SNR增强超过1 dB。sOS在模拟中实现了2-3 dB的SNR增强,并展示了在实际录音中增强SNR的能力。另外,增强水平随着基线SNR的降低而增加。OS的一个吸引人的特性是它可以估算所有单个试验。当耳蜗状况并非完全稳定时,此属性使得可以在更长的时间内调查CEOAE动态。
更新日期:2021-04-15
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