基于概念格的知识约简算法的实现，数据库中下载的论文-Based on concept lattice of knowledge reduction algorithm, the database download papers

四阶格型滤波器，较二阶，三阶误差更小，收敛速度变快，50次即可迭代完成，在降噪方面有显著效果。(Four order lattice filter, compared with the two order, three order error is smaller, faster convergence speed, 50 iterations can be completed, in terms of noise reduction has a significant effect.)