prewhitening

With MLE/DC and some coupling between them, the PSD and PDF parameters of colored non-Gaussian data can be estimated correctly.So processing of prewhitening and gaussianizing can be realized.

使用MLE/DC参估计方法，并在两种方法间建立一定耦合，即可对有色非高斯行准确功谱和概密度建模，而实现白与高斯化。