FIR数字滤波器的等波纹快速优化设计与实现

用加权的切比雪夫等波纹逼近设计FIR数字低通、高通、带通、带阻滤波器,并用对误差函数波纹中各格点作逐点搜索和选择性搜索两种办法予以实现,从中发现选择性搜索可使计算量降低55％—83％,为优化设计FIR数字滤波器提供了一条快速的途径。

FAST AND OPTIMUM METHOD IN DESIGN AND REALIZATION OF FIR DIGITAL FILTERS BY EQUIRIPPLE APPROXIMATION

In this paper, a fast and optimum method, used in the design of low-pass, high-pass bandpass, and band-stop FIR digital filters by weight Chebyshev equjripple approximation, is introduced. Two approaches, sequencial search and selective search for division points within half-wave of error function, used in realizations of these designs, are presented. It is found that selective search method can reduce 65% of the operation amount, compared with sequencial search method and it promises a new method for optimun design of FIR digital filters.