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本文详细讨论了一种窄带变换型非递归线性相位低通数字滤波器。针对这种滤波器难以编程的特点,在给出定义的基础上导出了两个定理,从而推出了软件实现方法。为了提高运算效率,把滤波与选抽结合起来。由于变换特性近似线性,使变换后这种滤波器的通带带宽与过渡带带宽之比基本保持不变。可以灵活地改变选抽比来改变谱的分辨率。
This paper discusses in detail a narrow-band transform non-recursive linear phase low-pass digital filter. Aiming at the characteristic that this kind of filter is hard to be programmed, two theorems are deduced on the basis of the definition and the software implementation method is introduced. In order to improve the efficiency of the operation, the combination of filtering and pumping. Due to the approximate linearity of the transform, the ratio of the passband bandwidth to the transition bandwidth of this filter after conversion is basically unchanged. You can change the sampling ratio flexibly to change the resolution of the spectrum.