Signal separation by nonlinear projections: the fetal ECG
Signal separation by nonlinear projections: the fetal ECG
复制标题
通过非线性投影进行信号分离：胎儿心电图
作者：
T. Schreiber;D. T. Kaplan
我们应用了一种局部线性投影技术，该技术已开发用于确定性混沌信号的降噪，以从标量母体心电图（ECG）记录中提取胎儿成分。虽然我们不期望母体心电信号是确定性混沌，但典型信号被嵌入到延迟空间后，有效地转化为低维流形。该方法能够提取胎儿心率，即使胎儿成分和噪声的幅度相当。如果噪声很小，胎儿心电图的更多细节，如P波和T波，可以被恢复。
We apply a locally linear projection technique which has been developed for noise reduction in deterministically chaotic signals to extract the fetal component from scalar maternal electrocardiographic (ECG) recordings. Although we do not expect the maternal ECG to be deterministic chaotic, typical signals are eeectively connned to a lower dimensional manifold when embedded in delay space. The method is capable of extracting fetal heart rate even when the fetal component and the noise are of comparable amplitude. If the noise is small, more details of the fetal ECG, like P{ and T{waves, can be recovered.