应用奇异值分解法作多导胎儿心电信号处理

Muti-channel fetal ECG signal processing by using singular value decomposition

本文研究了空间滤波技术中奇异值分解(SVD)方法用于处理多导FECG信号的基本技术问题。由于导联系统对于多导信号处理质量有重要影响,本文比较了几种导联系统的观测性能,分别计算了有向能量和比较了SVD处理的效果,提出了一种的新的导联系统,并提出有向信-信比和有向信噪比作为评价导联系统的性能的两项指标,以及奇异谱判读方法。文中给出了临床较为满意的实验结果。

>The muti-channel FECG signal processing by using singular value decomposition (SVD), one of the space filtering techniques, is dealt with in this paper. As the lead system has a significant effect on processing performance, the paper compares the performances of some lead systems, and calculates their orthogonal oriented energy and oriented source energy. A new lead system is presented for improving. the quality of processing by SVD. Two indexes of oriented signal-to-signal ratio and oriented signal-to-noise ratio are defined for evaluating the performance of lead system. An approach of judgement of singular value spectra is provided for dividing the subspaces. The clinical experimental results are shown.