对称性约束 meaning in English

symmetry constraints

It consists of several parts as follows : in the first part , after an introduction of basic theory and history of filter banks , an analysis of lattice structure filter banks is given . the requirements of perfect reconstruction and linear phase are discussed and some constrains of filter length and symmetry property are analyzed in details . besides , relative designing practice and examples are given
论文的工作主要有如下几个部分：第一部分，我们介绍了子带滤波器组的基本理论和发展情况，研究了格型结构滤波器组，讨论了其完全重构条件和实现线性相位的要求，并详细分析了在实现完全重构线性相位格型滤波器组时滤波器的长度和对称性约束，讨论了优化设计的方法，并给出了例子。