function?[f]=dft（xsp）;
f=fft（x）;
lenth=length（f）;
w=（1/lenth:1/lenth:0.5）*sp;
plot（w（2:length（w））f（2:length（w）））;
title（‘信號頻譜圖‘）;xlabel（‘Hz‘）;

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

?????文件???????1246??2008-06-14?00:00??xinhao_10k_q.wav

?????文件????????419??2012-05-09?15:32??yuyihnxihao.m

?????文件?????318786??2011-04-12?09:50??語音信號處理（電氣與電子工程學院）.pdf

?????文件????????154??2008-06-14?00:00??dft.m

?????文件???????1401??2012-05-20?22:52??lpc46.m

?????文件???????1039??2001-05-26?00:00??specgram_ex3p19.m

?????文件????????544??2001-05-26?00:00??speech1_10k.wav

?????文件????????180??2012-05-20?23:18??speeh.m

?????文件????????417??2008-03-15?00:00??stEn.m

?????文件??????31578??2001-05-26?00:00??we_be_10k.wav

?????文件????????312??2012-05-09?17:11??xie.m

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

???????????????356076????????????????????11