标题： 通过去形状短时傅里叶变换和非局部中值提取单导联腹部ECG中的胎儿ECG 显示英文标题

标题： Extract fetal ECG from single-lead abdominal ECG by de-shape short time Fourier transform and nonlocal median

摘要： 多基频检测问题以及从含有多个振荡分量和非平稳噪声的单通道信号中提取源信号的问题都是极具挑战性的任务。为了从单导联母体腹部心电信号中提取胎儿心电图（ECG），我们面临着这两个挑战。本文提出了一种新颖的方法，无需任何额外测量即可从单通道母体腹部心电信号中提取胎儿心电图信号。该算法由三个主要部分组成。首先，利用最近提出的非线性时频分析技术——去形状短时傅里叶变换估计母体和胎儿的心率；其次，应用节拍跟踪技术准确获取母体和胎儿的R波峰值；第三，通过非局部中值建立母体和胎儿的ECG波形。该算法在模拟胎儿心电信号数据库（{\em fecgsyn} 数据库）上进行了评估，并在两个真实数据库（{\em adfecgdb} 数据库和{\em CinC2013} 数据库）上进行了测试，这些数据库的标注由专家提供。总的来说，该算法可以应用于解决其他检测和源分离问题，并重构每个振荡分量的时间变化波形函数。 显示英文摘要

摘要： The multiple fundamental frequency detection problem and the source separation problem from a single-channel signal containing multiple oscillatory components and a nonstationary noise are both challenging tasks. To extract the fetal electrocardiogram (ECG) from a single-lead maternal abdominal ECG, we face both challenges. In this paper, we propose a novel method to extract the fetal ECG signal from the single channel maternal abdominal ECG signal, without any additional measurement. The algorithm is composed of three main ingredients. First, the maternal and fetal heart rates are estimated by the de-shape short time Fourier transform, which is a recently proposed nonlinear time-frequency analysis technique; second, the beat tracking technique is applied to accurately obtain the maternal and fetal R peaks; third, the maternal and fetal ECG waveforms are established by the nonlocal median. The algorithm is evaluated on a simulated fetal ECG signal database ({\em fecgsyn} database), and tested on two real databases with the annotation provided by experts ({\em adfecgdb} database and {\em CinC2013} database). In general, the algorithm could be applied to solve other detection and source separation problems, and reconstruct the time-varying wave-shape function of each oscillatory component.