在数值计算方面，本文采用了新的计算域，减小了由于边界条件造成的计算误差。
In numerical computation aspect, by implying new computational geometric field, computation error caused by boundary condition was decreased.
格型滤波器在数值计算性能和结构的模块化等方面都优于直接型，但实现起来较复杂。
Lattice fitter is superior to its counterpart of direct structure in numerical properties and modularity etc., but it is more complex to realize.
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