But the MACE filter is sensitive to the distortion, thus we optimize the filter by removing the hard constraint and satisfying certain criterion, which is so-called unconstrained correlation filter.

• 然而我们知道最小平均相关能量滤波器的效能对于失真非常敏感，因此我们利用满足某些特定的条件来最佳化滤波器的效能、而不使用严格的限制。