本文提出设计FIR数字滤波器的一种新方法,它把所要求的频率特性看成由若干个位于不同频率点上的近似于三角形的基本频率单元(模块)组成。把与这些基本频率单元所对应的时域序列相加便得到滤波器的冲激响应。此法的优点是在略微牺牲带内波纹(约2％)的情况之下,可以比窗口法减少1/3左右的时宽。文中给出了用上述方法设计的低通、高通、带通滤波器的一些公式,最后还与窗口法进行了比较并给出了设计实例。 In this paper, a new method of designing FIR digital filters is proposed, which considers the required frequency characteristics as consisting of a number of approximately triangular fundamental frequency elements (modules) located at different frequency points. The sum of the time-domain sequences corresponding to these elementary frequency elements gives the filter impulse response. The advantage of this method is that it can reduce the time width by 1/3 or so than the window method with a slight sacrifice of in-band ripples (about 2%). Some formulas of low-pass, high-pass, band-pass filters designed by the above method are given in this paper. Finally, the window method is compared and the design examples are given.