%DEMOENVELOPE?shows?how?to?use?function?envelope?to?obtain?the?
%???upper/down?envelope?of?a?given?data?and?plot?the?envelope.
%
%???See?also?EVELOPE

%???Designed?by:?Lei?Wang??11-Mar-2003.
%???Last?Revision:?21-Mar-2003.
%???Dept.?Mechanical?&?Aerospace?Engineering?NC?State?University.
%?$Revision:?1.1?$??$Date:?3/21/2003?10:38?AM?$

clc;

%?Load?a?signal?waveform
%--------------------------------------------
load?data.txt?data;
t?=?data（:1）;?%?time?series
y?=?data（:2）;?%?signal?data
figure（1）;
plot（ty‘b-‘）;?
title（‘The?original?signal?waveform‘‘FontSize‘18）;



%?Call?function?envelope?to?
%?obtain?the?envelope?data
%--------------------------------------------
[updown]?=?envelope（ty‘linear‘）;



%?Show?the?envelope?alone
%--------------------------------------------
figure（2）
plot（tup）;?hold?on;
plot（tdown）;
title（‘The?envelope?of?the?given?signal?data‘‘FontSize‘18）;
hold?off;



%?Show?the?original?signal?and?its?envelope
%--------------------------------------------
figure（3）
plot（ty‘g-‘）;?hold?on;
plot（tup‘r-.‘）;
plot（tdown‘r-.‘）;
title（‘The?envelope?vs?the?given?signal?data‘‘FontSize‘18）;
hold?off;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????23133??2003-03-21?09:57??Envelop1.1\data.txt
?????文件????????1222??2003-03-21?10:52??Envelop1.1\DemoEnvelope.m
?????文件????????1704??2003-03-21?10:52??Envelop1.1\envelope.m
?????目錄???????????0??2003-03-21?10:53??Envelop1.1\