基于分布式算法的线性相位滤波器设计及优化

Design and Optimization of Linear Phase Filter Based on Distributed Algorithm

设计了一种实现等波纹带通滤波的线性相位FIR滤波器,分布式算法被用于具体实现过程,并在此基础上进行优化。根据Ⅰ类线性相位滤波器的系数特点,对滤波器进行降阶。通过拆分查找表,减少查找表的规模,从而减小芯片面积。采用并行计算改进分布式算法体系结构,提高运算速度。最后,用Modelsim对不同频率正弦信号进行滤波仿真。

A linear phase FIR filter was designed to realize equal ripple bandpass filtering,and the distributed algorithm was used in the specific implementation process and optimized on this basis.According to the coefficient characteristics of class I linear phase filter,the order of the filter was reduced.By splitting the lookup table,the size of the lookup table was reduced,so as to reduce the chip area.Parallel computing was adopted to improve the architecture of distributed algorithm and improve the operation speed.Finally,the filtering simulation of sinusoidal signals with different frequencies was carried out with Modelsim.