x7?=?wavread（‘..\ch6\7a.wav‘）;
y??=?enframe（x7?240?80）;
amp1?=?sum（abs（y）2）;
amp2?=?sum（y.*y2）;
amp3?=?sum（log（y.*y+eps）2）;

figure（1）
subplot（311）
plot（amp1）
legend（‘amp?=?\Sigma|x|‘）

subplot（312）
plot（amp2）
legend（‘amp?=?\Sigma|x^2|‘）

subplot（313）
plot（amp3）
legend（‘amp?=?\Sigma|log（x^2）|‘）

zcr?=?zeros（size（y1）1）;
delta?=?0.02;
for?i=1:size（y1）
????x?=?y（i:）;
????for?j=1:length（x）-1
????????if?x（j）?*?x（j+1）?delta
????????????zcr（i）?=?zcr（i）+1;
????????end
????end
end

figure（2）
subplot（211）
plot（x7）
subplot（212）
plot（zcr）

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

?????文件?????262144??2001-11-04?11:42??ch12\ActVoice.ocx

?????文件?????106496??2001-11-03?11:40??ch12\MatWave.dll

?????文件????????598??2001-10-30?16:51??ch12\ampzcr.m

?????文件????????135??2001-11-04?11:39??ch12\sample.m

?????文件????????203??2001-11-03?11:17??ch12\testmex.m

?????文件?????????96??2001-11-04?10:56??ch12\testocx.m

?????文件???????2410??2001-10-31?01:25??ch12\vad.m

?????文件??????17812??2001-10-31?23:12??ch12\MatWave\MatWave.aps

?????文件????????328??2001-10-31?23:11??ch12\MatWave\MatWave.clw

?????文件???????1757??2001-10-31?23:11??ch12\MatWave\MatWave.cpp

?????文件????????198??2001-11-01?02:12??ch12\MatWave\MatWave.def

?????文件???????4410??2001-11-03?11:42??ch12\MatWave\MatWave.dsp

?????文件????????537??2001-10-31?23:11??ch12\MatWave\MatWave.dsw

?????文件???????1264??2001-10-31?23:11??ch12\MatWave\MatWave.h

?????文件??????58368??2001-11-03?11:41??ch12\MatWave\MatWave.ncb

?????文件??????48640??2001-11-03?11:41??ch12\MatWave\MatWave.opt

?????文件???????2003??2001-11-03?11:40??ch12\MatWave\MatWave.plg

?????文件???????3071??2001-10-31?23:11??ch12\MatWave\MatWave.rc

?????文件???????2577??2001-10-31?23:11??ch12\MatWave\ReadMe.txt

?????文件????????379??2001-10-31?23:11??ch12\MatWave\Resource.h

?????文件????????209??2001-10-31?23:11??ch12\MatWave\StdAfx.cpp

?????文件???????1447??2001-10-31?23:11??ch12\MatWave\StdAfx.h

?????文件???????1199??2001-11-03?11:15??ch12\MatWave\main.cpp

?????文件???????7279??2001-11-03?11:25??ch12\MatWave\wave.cpp

?????文件????????210??2001-11-02?11:59??ch12\MatWave\wave.h

?????文件????????399??2001-10-31?23:11??ch12\MatWave\res\MatWave.rc2

?????文件??????19132??2001-11-03?14:37??ch12\ActVoice\ActVoice.aps

?????文件????????743??2001-11-03?16:29??ch12\ActVoice\ActVoice.clw

?????文件???????1944??2001-11-03?14:37??ch12\ActVoice\ActVoice.cpp

?????文件????????224??2001-11-03?14:37??ch12\ActVoice\ActVoice.def

............此處省略55個文件信息