设计实现采样频率24kHz、截止频率6kHz的37阶FIR低通滤波器。设计滤波器，将提供信号中的9kHz信号滤除，余下3kHz信号。-Design and Implementation of the sampling frequency 24kHz, 6kHz cutoff frequency of 37-order FIR low-pass filter. Filter is designed to provide a signal of the signal filter 9kHz rema