系数预处理在FIR数字滤波器设计中的应用

系数预处理属于算法强度缩减的范畴.本文主要介绍了系数预处理的思想,通过系数预处理减少FIR数字滤波器中乘法运算器的个数而适当地增加加法运算器的个数,从而对FIR数字滤波器的结构进行改进,同时给出了较为完整的改进算法的ASIC实现,对于输入的信号其长度为可变的情况也给出了通过分段卷积的方法来实现的思想,并且给出了具体的实例.通过合理的设计,大大减少了FIR数字滤波器芯片的面积,提高芯片的信号处理速度.

Application of Coefficient Pretreatment in the Design of Digital Filter

Coefficient pretreatment belongs to the category of algorithm intensity reduction. The concept of coefficient pretreatment is introduced in this paper, It reduces the amount of multiplier and increases the amount of adder properly, The construction of FIR filter is improved according to this algorithm. In the meanwhile ,the whole ASIC implementation of FIR filter after improving the algorithm is given in this paper ,the paper introduces the concept of subsection convolution to design the filter when the length of signal is variable ,and gives an example. The area of chip can be reduced and processing speed can be improved significantly by reasonable design.