CAJ | 학술논문

从母体腹部混合信号中分离胎儿心电信号是一项复杂的信号处理问题，获取清晰的胎儿心电图对围产期胎儿监护至关重要。胎儿心电信号具有周期性的时间结构，根据胎儿心电的自相关性，以及胎儿心电信号与其他源信号之间统计独立，本文最小化周期差分的方差与期望提取信号的比值建立有噪条件下的盲提取目标函数，推导出了基于广义特征值最大化的胎儿心电提取方法。该算法在一个动态的延迟范围内计算自相关矩阵，只需要计算广义特征值和特征向量，不需要迭代计算，算法简单。仿真实验表明，该算法能够提取到清晰的胎儿心电，性能稳定。
종모체복부혼합신호중분리태인심전신호시일항복잡적신호처리문제，획취청석적태인심전도대위산기태인감호지관중요。태인심전신호구유주기성적시간결구，근거태인심전적자상관성，이급태인심전신호여기타원신호지간통계독립，본문최소화주기차분적방차여기망제취신호적비치건립유조조건하적맹제취목표함수，추도출료기우엄의특정치최대화적태인심전제취방법。해산법재일개동태적연지범위내계산자상관구진，지수요계산엄의특정치화특정향량，불수요질대계산，산법간단。방진실험표명，해산법능구제취도청석적태인심전，성능은정。
Extracted fetal electrocardiogram (FECG)from the maternal abdominal signal is a complex signal processing problems, obtained the clear FECG is a great significance for perinatal fetal monitoring. FECG has periodic time structure , according to the autocorrelations of FECG, and statistical independence between FECG and other sources, this paper minimize the ratio between the varianceof the difference periodic and expected to extract the signal , and established theobjective function of blind extraction under the condition of noises.Then derived the FECG extraction method of maximizing generalized eigenvalue. The algorithm calculates the autocorrelation matrix with a dynamic delay, it does not need to be iterative calculation but calculate generalized eigenvalue and eigenvector, algorithm is simple. Simulation experiments show that the algorithm can extract the clear FECG , and the performance is stable.