%?MATLAB?script?for?signal?and?linear?time-invariant?system.
echo?on
df=0.01;????????????????????%?freq.?resolution頻率分辨率
fs=5;???????????????????????%?sampling?frequency采樣頻率
ts=1/fs;????????????????????????????????????%?sampling?interval采樣間隔
t=[-5:ts:5];????????????????????????????????%?time?vector時間矢量
x=zeros（1length（t））;???????????????????%?input?signal?initiation
x（16:26）=t（16:26）+2;
x（27:31）=2*ones（15）;
x（32:41）=2+2*cos（0.5*pi*t（32:41））;
x（42:46）=2*ones（15）;


%?Part?1
[Xx1df1]=fftseq（xtsdf）;?????????????????%?spectrum?of?the?input輸入普
f=[0:df1:df1*（length（x1）-1）]-fs/2;??????????%?frequency?vector
X1=X/fs;????????????????????????????????????%?scaling測量


%?Part?2
%?Filter?transfer?function濾波器傳遞函數(shù)
[Y1Xdf1]=fftseq（ytsdf）;???
H=[ones（1ceil（1.5/df1））zeros（1length（X）-2*ceil（1.5/df1））ones（1ceil（1.5/df1））];?????????????