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。
Physical meaning: the self-correlation function and the energy spectrum density function compose a Fourier transform 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。
Meaning: The self-correlation function and power spectrum density Function of a power-typed signal compose a FT pair.
变换域LMS算法能通过正交变换有效降低输入信号自相关矩阵特征值的分散程度，可提高算法的收敛速度；
The transform domain LMS algorithm can reduce the cross-correlation of input signals effectively through orthogonal transforms, so the convergence rate will be improved;
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