Physical meaning: the self-correlationfunction and the energy spectrum density function compose a Fourier transform pair.
物理含义：能量信号的自相关函数与能量谱密度函数构成傅立叶变换对。
2
Meaning: The self-correlationfunction and power spectrum density Function of a power-typed signal compose a FT pair.
上式表明： 功率型信号的自相关函数与其功率谱密度函数构成傅立叶变换对。
3
At present, there are three methods to select delay time: self-correlationfunction method the average displacement method and mutual information method.