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请教下,有谁用过CCS自带的速度环低通滤波器SPEED_FR_MACRO啊,求助下原理



小弟最近在学习DSP控制伺服,但是看到程序中有如下程序段:

 ks1 = 1.0/(1.0+T*2*PI*10000);//速度环输入一阶低通滤波
 ks2 = 1.0-ks1;

speed2 = ks1*speed2 + ks2*speed1;

我知道这是低通滤波器,但是程序中滤波器原理我找了很久也不知道是啥。。。。按照正常情况不是应该1/(2*pi*fc)吗,程序种完全结构不对啊,小弟第一次在TI论坛发帖子,求助各位大神,罩下我!!!!!!!!!!!