Abe Sumiyoshi, Sarlis N V, Skordas E S, Tanaka H K, Varotsos P A
Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan.
Phys Rev Lett. 2005 May 6;94(17):170601. doi: 10.1103/PhysRevLett.94.170601. Epub 2005 May 2.
The concept of natural time turned out to be useful in revealing dynamical features behind complex time series including electrocardiograms, ionic current fluctuations of membrane channels, seismic electric signals, and seismic event correlation. However, the origin of this empirical usefulness is yet to be clarified. Here, it is shown that this time domain is in fact optimal for enhancing the signals in time-frequency space by employing the Wigner function and measuring its localization property.
事实证明，自然时间的概念有助于揭示包括心电图、膜通道离子电流波动、地震电信号和地震事件相关性在内的复杂时间序列背后的动力学特征。然而，这种经验实用性的起源尚待阐明。在此表明，通过使用维格纳函数并测量其局域化特性，这个时域实际上对于增强时频空间中的信号是最优的。
