整系数数字滤波器及其改进

Integer Coefficient Digital Filter and the Improvement on It

本文采用不同阶数级联法,提高整系数数字滤波器阻带衰减α_3。并由此提出零点在|z|=1圆上非均匀分布整系数数字滤波器,其α_3大于同阶零点均匀分布整系数数字滤波器。当阶数为8或6时,α_3提高了3．52dB和12．65dB。

In this paper a ditferent order cascade method was used to increase the stop-band-atlenuation (s) of integer coefficient digital filter (ICDF). On above ICDF an another ICDF having zeros distributed unequal in the cirde |z| = 1 was pro-posed. Its s is greater than that of the ICDF having zeros distributed equal in the cir-cle |z| = l. When order is 8 and 6, s, increases by 3.52dB and 12.65 dB.