jichu_3.m

关于滤波器的一些源程序

%设计采样频率为900Hz，9阶高通滤波器，截止频率为300Hz(butterworth)
clear;clc;close all;
fs=900;
[b,a]=butter(9,300/500,'high');
freqz(b,a,128,1000)
%[H,w]=freqz(b,a,512);
%w=[0:255]*2/fs;
%plot(w,abs(H(1:256)));