心室晚电位的时间－频率表示法的进一步改进

An Improvement of Time-frequency Representation Method for Ventricular Late Potentials Analysis

在心室晚电位的研究中，我们引入了信号的时间一频率表示法，并根据晚电位的具体特性用Ｗｉｇｎｅｒ分布法（维格纳分布）把信号表示为在时间及频率空间中的能量分布。由于Ｗｉｇｎｅｒ分布的优异性质使我们有可能更准确表示出心室晚电位的存在。但当输入信号是两个信号的线性叠加时，Ｗｉｇｎｅｒ分布的结果会出现一个交叉项，相当于引入干扰。针对此不足，作者介绍改进方案，消除部分交叉项，收到较好的效果，并给出一些仿真及应用实例。

Based on Wigner time-frequency representation,we developed improved time-frequency representation method of signals in the study of ventricular late potential.The signals were represented as energy distribution in time-frequency domain.Due to excellent characteristics of Wigner distribution. it was possible to find the existence of ventricular late potential.But when the input signal is a linear overlapping of two signals,there will be a cross term in the results of Wigner distribution,so that better results can be obtained.Also,several simulation and application practical examples are given here.