用非理想频率特性模型设计线性相移非递归型(FIR)数字滤波器的探讨

Study of linear phase FIR digital filters using non-ideal frequency characteristic models

摘要: 本文评述了用窗函数法设计线性相移非递归型(FIR)数字滤波器存在的问题,探讨用非理想频率特性的实际模型函数设计该种滤波器,采用了梯形函数、升余弦滚降函数等模型。由于目标明确,方法直接,消除了Gibbs现象,有利于简化计算及优化设计。

Abstract: The problems of designing linear phase FIR digital filters using window functions are discussed. The design of linear phase FIR digital filters using practical non-ideal frequency characteristic models is evaluated. Ladder and raised cosine roll-off, etc. function models are studied. Results show that the design procedure of FIR filters is simplified because of the clear object, direct method, and elimination of the Gibbs phenomenon.