clear?all;
a=2;
A=load（‘1.txt‘）;
switch?a
????case?1
????s=A（55001:600004）;
????case?2
????s=A（55001:600004）;
end
fs=1;????????????????????????????????????????%采樣頻率
N=5000;??????????????????????????????????????%采樣點數
n=0:N-1;
t=n/fs;??????????????????????????????????????%時間
subplot（121）;plot（ts）;
title（‘輸入信號‘）;xlabel（‘t/s‘）;ylabel（‘幅度‘）;%未濾波時??時域波形
sfft=fft（s）;??%傅里葉變換
subplot（122）;??
plot（（1:length（sfft）/2）*fs/length（sfft）2*abs（sfft（1:length（sfft）/2））/length（sfft））;??
title（‘信號頻譜‘）;xlabel（‘頻率/Hz‘）;ylabel（‘幅度‘）;??%未濾波時??頻域波形
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%設計巴特沃斯低通濾波器%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
sF=s;
%%%%%%%%%%%%%%%%%%%時域特征值計算%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
iemg1=sum（abs（sF））/length（sF）;
rms1=sqrt（sum（sF.^2）/length（sF））;
m=mean（s）;
s11=std（s）;
%%%%%%%%%%

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1898??2018-06-05?10:31??Untitled.m

????.......??????2836??2018-04-29?18:22??a.txt

????.......???3294670??2018-05-20?09:06??1.txt

-----------?---------??----------?-----??----

??????????????3299404????????????????????3