dtlb.m

来自「DSP 系统带有信号生成 滤波等相关功能 下载后 请用解压缩软件打开」· M 代码 · 共 13 行

%低通滤波器
ws=str2num(get(handles.ws,'string'));
wp=str2num(get(handles.wp,'string'));
rs=str2num(get(handles.rs,'string'));
rp=str2num(get(handles.rp,'string'));
global y
global y3
global y4
global b
global a
[N,Wc]=buttord(wp,ws,rp,rs);
%估算得到Butterworth低通滤波器的最小阶数N和3dB截止频率Wc
[b,a]=butter(N,Wc);%设计Butterworth低通滤波器